From 1c86a620d74f4f9383c4956dafd3e2486300dc0d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= <egil@erlang.org>
Date: Wed, 17 Jun 2015 17:33:29 +0200
Subject: erts: Remove HALFWORD_HEAP definition

---
 erts/emulator/sys/common/erl_mmap.c |  3 +--
 erts/emulator/sys/common/erl_mseg.c | 46 -------------------------------------
 erts/emulator/sys/common/erl_mseg.h |  3 ---
 3 files changed, 1 insertion(+), 51 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_mmap.c b/erts/emulator/sys/common/erl_mmap.c
index 754047829f..e6d0e1e281 100644
--- a/erts/emulator/sys/common/erl_mmap.c
+++ b/erts/emulator/sys/common/erl_mmap.c
@@ -2453,7 +2453,6 @@ Eterm erts_mmap_debug_info(Process* p)
         UWord values[4];
         Eterm *hp, *hp_end;
         Uint may_need;
-        const Uint PTR_BIG_SZ = HALFWORD_HEAP ? 3 : 2;
 
         erts_smp_mtx_lock(&mmap_state.mtx);
         values[0] = (UWord)mmap_state.sa.bot;
@@ -2464,7 +2463,7 @@ Eterm erts_mmap_debug_info(Process* p)
         sua_list = build_free_seg_list(p, &mmap_state.sua.map);
         erts_smp_mtx_unlock(&mmap_state.mtx);
 
-        may_need = 4*(2+3+PTR_BIG_SZ) + 2*(2+3);
+        may_need = 4*(2+3+2) + 2*(2+3);
         hp = HAlloc(p, may_need);
         hp_end = hp + may_need;
 
diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c
index 0d51aad863..8073d5b908 100644
--- a/erts/emulator/sys/common/erl_mseg.c
+++ b/erts/emulator/sys/common/erl_mseg.c
@@ -107,9 +107,6 @@ const ErtsMsegOpt_t erts_mseg_default_opt = {
     0,			/* Absolute shrink threshold */
     0,			/* Relative shrink threshold */
     0			/* Scheduler specific        */
-#if HALFWORD_HEAP
-    ,0                  /* need low memory */
-#endif
 };
 
 
@@ -184,12 +181,7 @@ struct ErtsMsegAllctr_t_ {
 
     MemKind* mk_list;
 
-#if HALFWORD_HEAP
-    MemKind low_mem;
-    MemKind hi_mem;
-#else
     MemKind the_mem;
-#endif
 
     Uint max_cache_size;
     Uint abs_max_cache_bad_fit;
@@ -309,11 +301,6 @@ mseg_create(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, UWord *sizep)
 #endif
     void *seg;
     Uint32 mmap_flags = 0;
-#if HALFWORD_HEAP
-    mmap_flags |= ((mk == &ma->low_mem)
-		   ? ERTS_MMAPFLG_SUPERCARRIER_ONLY
-		   : ERTS_MMAPFLG_OS_ONLY);
-#endif
     if (MSEG_FLG_IS_2POW(flags))
 	mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
 
@@ -334,11 +321,6 @@ static ERTS_INLINE void
 mseg_destroy(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, void *seg_p, UWord size) {
     
     Uint32 mmap_flags = 0;
-#if HALFWORD_HEAP
-    mmap_flags |= ((mk == &ma->low_mem)
-		   ? ERTS_MMAPFLG_SUPERCARRIER_ONLY
-		   : ERTS_MMAPFLG_OS_ONLY);
-#endif
     if (MSEG_FLG_IS_2POW(flags))
 	 mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
 
@@ -360,11 +342,6 @@ mseg_recreate(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, void *old_seg, UWor
 #endif
     void *new_seg;
     Uint32 mmap_flags = 0;
-#if HALFWORD_HEAP
-    mmap_flags |= ((mk == &ma->low_mem)
-		   ? ERTS_MMAPFLG_SUPERCARRIER_ONLY
-		   : ERTS_MMAPFLG_OS_ONLY);
-#endif
     if (MSEG_FLG_IS_2POW(flags))
 	mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
 
@@ -768,11 +745,7 @@ void erts_mseg_clear_cache(void) {
 static ERTS_INLINE MemKind* memkind(ErtsMsegAllctr_t *ma,
 				    const ErtsMsegOpt_t *opt)
 {
-#if HALFWORD_HEAP
-    return opt->low_mem ? &ma->low_mem : &ma->hi_mem;
-#else
     return &ma->the_mem;
-#endif
 }
 
 static void *
@@ -1326,12 +1299,7 @@ erts_mseg_info(int ix,
     ERTS_MSEG_LOCK(ma);
     ERTS_DBG_MA_CHK_THR_ACCESS(ma);
 
-#if HALFWORD_HEAP
-    values[n++] = info_memkind(ma, &ma->low_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp);
-    values[n++] = info_memkind(ma, &ma->hi_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp);
-#else
     values[n++] = info_memkind(ma, &ma->the_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp);
-#endif
     if (hpp || szp)
 	res = bld_2tup_list(hpp, szp, n, atoms, values);
 
@@ -1488,15 +1456,6 @@ erts_mseg_init(ErtsMsegInit_t *init)
 
     erts_mtx_init(&init_atoms_mutex, "mseg_init_atoms");
 
-#if HALFWORD_HEAP
-    if (sizeof(void *) != 8)
-	erl_exit(-1,"Halfword emulator cannot be run in 32bit mode");
-
-    init->mmap.virtual_range.start = (char *) sbrk(0);
-    init->mmap.virtual_range.end = (char *) 0x100000000UL;
-    init->mmap.sco = 0;
-#endif
-
     erts_mmap_init(&init->mmap);
 
     if (!IS_2POW(GET_PAGE_SIZE))
@@ -1531,12 +1490,7 @@ erts_mseg_init(ErtsMsegInit_t *init)
 
 	ma->mk_list = NULL;
 
-#if HALFWORD_HEAP
-	mem_kind_init(ma, &ma->low_mem, "low memory");
-	mem_kind_init(ma, &ma->hi_mem, "high memory");
-#else
 	mem_kind_init(ma, &ma->the_mem, "all memory");
-#endif
 
 	sys_memzero((void *) &ma->calls, sizeof(ErtsMsegCalls));
     }
diff --git a/erts/emulator/sys/common/erl_mseg.h b/erts/emulator/sys/common/erl_mseg.h
index ba04e919fc..656484702d 100644
--- a/erts/emulator/sys/common/erl_mseg.h
+++ b/erts/emulator/sys/common/erl_mseg.h
@@ -87,9 +87,6 @@ typedef struct {
     UWord abs_shrink_th;
     UWord rel_shrink_th;
     int sched_spec;
-#if HALFWORD_HEAP
-    int low_mem;
-#endif
 } ErtsMsegOpt_t;
 
 extern const ErtsMsegOpt_t erts_mseg_default_opt;
-- 
cgit v1.2.3


From 298210017aedaf01b2eb477f4375af4d30822c71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= <egil@erlang.org>
Date: Mon, 22 Jun 2015 16:53:23 +0200
Subject: erts: Remove halfword MemKind mseg

---
 erts/emulator/sys/common/erl_mseg.c | 332 +++++++++++++++---------------------
 1 file changed, 135 insertions(+), 197 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c
index 8073d5b908..7eb8a4a460 100644
--- a/erts/emulator/sys/common/erl_mseg.c
+++ b/erts/emulator/sys/common/erl_mseg.c
@@ -99,8 +99,6 @@ static const int debruijn[32] = {
 
 static int atoms_initialized;
 
-typedef struct mem_kind_t MemKind;
-
 const ErtsMsegOpt_t erts_mseg_default_opt = {
     1,			/* Use cache		     */
     1,			/* Preserv data		     */
@@ -139,7 +137,14 @@ struct cache_t_ {
 
 typedef struct ErtsMsegAllctr_t_ ErtsMsegAllctr_t;
 
-struct mem_kind_t {
+struct ErtsMsegAllctr_t_ {
+    int ix;
+
+    int is_init_done;
+    int is_thread_safe;
+    erts_mtx_t mtx;
+
+    int is_cache_check_scheduled;
 
     cache_t cache[MAX_CACHE_SIZE];
     cache_t cache_unpowered_node;
@@ -165,24 +170,6 @@ struct mem_kind_t {
 	} max_ever;
     } segments;
 
-    ErtsMsegAllctr_t *ma;
-    const char* name;
-    MemKind* next;
-};/*MemKind*/
-
-struct ErtsMsegAllctr_t_ {
-    int ix;
-
-    int is_init_done;
-    int is_thread_safe;
-    erts_mtx_t mtx;
-
-    int is_cache_check_scheduled;
-
-    MemKind* mk_list;
-
-    MemKind the_mem;
-
     Uint max_cache_size;
     Uint abs_max_cache_bad_fit;
     Uint rel_max_cache_bad_fit;
@@ -294,7 +281,7 @@ schedule_cache_check(ErtsMsegAllctr_t *ma) {
 /* #define ERTS_PRINT_ERTS_MMAP */
 
 static ERTS_INLINE void *
-mseg_create(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, UWord *sizep)
+mseg_create(ErtsMsegAllctr_t *ma, Uint flags, UWord *sizep)
 {
 #ifdef ERTS_PRINT_ERTS_MMAP
     UWord req_size = *sizep;
@@ -318,7 +305,7 @@ mseg_create(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, UWord *sizep)
 }
 
 static ERTS_INLINE void
-mseg_destroy(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, void *seg_p, UWord size) {
+mseg_destroy(ErtsMsegAllctr_t *ma, Uint flags, void *seg_p, UWord size) {
     
     Uint32 mmap_flags = 0;
     if (MSEG_FLG_IS_2POW(flags))
@@ -335,7 +322,7 @@ mseg_destroy(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, void *seg_p, UWord s
 }
 
 static ERTS_INLINE void *
-mseg_recreate(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, void *old_seg, UWord old_size, UWord *sizep)
+mseg_recreate(ErtsMsegAllctr_t *ma, Uint flags, void *old_seg, UWord old_size, UWord *sizep)
 {
 #ifdef ERTS_PRINT_ERTS_MMAP
     UWord req_size = *sizep;	
@@ -369,11 +356,8 @@ do {									\
 		       || erts_smp_thr_progress_is_blocking()		\
 		       || ERTS_IS_CRASH_DUMPING);			\
 } while (0)
-#define ERTS_DBG_MK_CHK_THR_ACCESS(MK) \
-  ERTS_DBG_MA_CHK_THR_ACCESS((MK)->ma)
 #else
 #define ERTS_DBG_MA_CHK_THR_ACCESS(MA)
-#define ERTS_DBG_MK_CHK_THR_ACCESS(MK)
 #endif
 
 /* Cache interface */
@@ -386,10 +370,10 @@ static ERTS_INLINE void mseg_cache_clear_node(cache_t *c) {
     c->prev = c;
 }
 
-static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, UWord size, Uint flags) {
+static ERTS_INLINE int cache_bless_segment(ErtsMsegAllctr_t *ma, void *seg, UWord size, Uint flags) {
 
     cache_t *c;
-    ERTS_DBG_MK_CHK_THR_ACCESS(mk);
+    ERTS_DBG_MA_CHK_THR_ACCESS(ma);
 
     ASSERT(!MSEG_FLG_IS_2POW(flags) || (MSEG_FLG_IS_2POW(flags) && MAP_IS_ALIGNED(seg) && IS_2POW(size)));
 
@@ -398,11 +382,11 @@ static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, UWord size, U
      * Large blocks has no such cache and it is up to mseg to cache them to speed things up.
      */
 
-    if (!erts_circleq_is_empty(&(mk->cache_free))) {
+    if (!erts_circleq_is_empty(&(ma->cache_free))) {
 
 	/* We have free slots, use one to cache the segment */
 
-	c = erts_circleq_head(&(mk->cache_free));
+	c = erts_circleq_head(&(ma->cache_free));
 	erts_circleq_remove(c);
 
 	c->seg  = seg;
@@ -414,29 +398,28 @@ static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, UWord size, U
 	    ASSERT(ix < CACHE_AREAS);
 	    ASSERT((1 << (ix + MSEG_ALIGN_BITS)) == size);
 
-	    erts_circleq_push_head(&(mk->cache_powered_node[ix]), c);
+	    erts_circleq_push_head(&(ma->cache_powered_node[ix]), c);
 
 	} else
-	    erts_circleq_push_head(&(mk->cache_unpowered_node), c);
+	    erts_circleq_push_head(&(ma->cache_unpowered_node), c);
 
-	mk->cache_size++;
-	ASSERT(mk->cache_size <= mk->ma->max_cache_size);
+	ma->cache_size++;
 
 	return 1;
-    } else if (!MSEG_FLG_IS_2POW(flags) && !erts_circleq_is_empty(&(mk->cache_unpowered_node))) {
+    } else if (!MSEG_FLG_IS_2POW(flags) && !erts_circleq_is_empty(&(ma->cache_unpowered_node))) {
 	/* No free slots.
 	 * Evict oldest slot from unpowered cache so we can cache an unpowered (sbc) segment  */
 
-	c = erts_circleq_tail(&(mk->cache_unpowered_node));
+	c = erts_circleq_tail(&(ma->cache_unpowered_node));
 	erts_circleq_remove(c);
 
-	mseg_destroy(mk->ma, ERTS_MSEG_FLG_NONE, mk, c->seg, c->size);
+	mseg_destroy(ma, ERTS_MSEG_FLG_NONE, c->seg, c->size);
 	mseg_cache_clear_node(c);
 
 	c->seg  = seg;
 	c->size = size;
 
-	erts_circleq_push_head(&(mk->cache_unpowered_node), c);
+	erts_circleq_push_head(&(ma->cache_unpowered_node), c);
 
 	return 1;
     } else if (!MSEG_FLG_IS_2POW(flags)) {
@@ -450,20 +433,20 @@ static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, UWord size, U
 	int i;
 
 	for( i = 0; i < CACHE_AREAS; i++) {
-	    if (erts_circleq_is_empty(&(mk->cache_powered_node[i])))
+	    if (erts_circleq_is_empty(&(ma->cache_powered_node[i])))
 		continue;
 
-	    c = erts_circleq_tail(&(mk->cache_powered_node[i]));
+	    c = erts_circleq_tail(&(ma->cache_powered_node[i]));
 	    erts_circleq_remove(c);
 
-	    mseg_destroy(mk->ma, ERTS_MSEG_FLG_2POW, mk, c->seg, c->size);
+	    mseg_destroy(ma, ERTS_MSEG_FLG_2POW, c->seg, c->size);
 
 	    mseg_cache_clear_node(c);
 
 	    c->seg  = seg;
 	    c->size = size;
 
-	    erts_circleq_push_head(&(mk->cache_unpowered_node), c);
+	    erts_circleq_push_head(&(ma->cache_unpowered_node), c);
 
 	    return 1;
 	}
@@ -472,11 +455,11 @@ static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, UWord size, U
     return 0;
 }
 
-static ERTS_INLINE void *cache_get_segment(MemKind *mk, UWord *size_p, Uint flags) {
+static ERTS_INLINE void *cache_get_segment(ErtsMsegAllctr_t *ma, UWord *size_p, Uint flags) {
 
     UWord size = *size_p;
 
-    ERTS_DBG_MK_CHK_THR_ACCESS(mk);
+    ERTS_DBG_MA_CHK_THR_ACCESS(ma);
 
     if (MSEG_FLG_IS_2POW(flags)) {
 
@@ -489,10 +472,10 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, UWord *size_p, Uint flag
 
 	for( i = ix; i < CACHE_AREAS; i++) {
 
-	    if (erts_circleq_is_empty(&(mk->cache_powered_node[i])))
+	    if (erts_circleq_is_empty(&(ma->cache_powered_node[i])))
 		continue;
 
-	    c = erts_circleq_head(&(mk->cache_powered_node[i]));
+	    c = erts_circleq_head(&(ma->cache_powered_node[i]));
 	    erts_circleq_remove(c);
 
 	    ASSERT(IS_2POW(c->size));
@@ -501,31 +484,31 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, UWord *size_p, Uint flag
 	    csize = c->size;
 	    seg   = (char*) c->seg;
 
-	    mk->cache_size--;
-	    mk->cache_hits++;
+	    ma->cache_size--;
+	    ma->cache_hits++;
 
 	    /* link to free cache list */
 	    mseg_cache_clear_node(c);
-	    erts_circleq_push_head(&(mk->cache_free), c);
+	    erts_circleq_push_head(&(ma->cache_free), c);
 
-	    ASSERT(!(mk->cache_size < 0));
+	    ASSERT(!(ma->cache_size < 0));
 
 	    if (csize != size)
-		mseg_destroy(mk->ma, ERTS_MSEG_FLG_2POW, mk, seg + size, csize - size);
+		mseg_destroy(ma, ERTS_MSEG_FLG_2POW, seg + size, csize - size);
 
 	    return seg;
 	}
     } 
-    else if (!erts_circleq_is_empty(&(mk->cache_unpowered_node))) {
+    else if (!erts_circleq_is_empty(&(ma->cache_unpowered_node))) {
 	void *seg;
 	cache_t *c;
 	cache_t *best = NULL;
 	UWord bdiff = 0;
 	UWord csize;
-	UWord bad_max_abs = mk->ma->abs_max_cache_bad_fit;
-	UWord bad_max_rel = mk->ma->rel_max_cache_bad_fit;
+	UWord bad_max_abs = ma->abs_max_cache_bad_fit;
+	UWord bad_max_rel = ma->rel_max_cache_bad_fit;
 
-	erts_circleq_foreach(c, &(mk->cache_unpowered_node)) {
+	erts_circleq_foreach(c, &(ma->cache_unpowered_node)) {
 	    csize = c->size;
 	    if (csize >= size) {
 		if (((csize - size)*100 < bad_max_rel*size) && (csize - size) < bad_max_abs ) {
@@ -534,11 +517,11 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, UWord *size_p, Uint flag
 
 		    erts_circleq_remove(c);
 
-		    mk->cache_size--;
-		    mk->cache_hits++;
+		    ma->cache_size--;
+		    ma->cache_hits++;
 
 		    mseg_cache_clear_node(c);
-		    erts_circleq_push_head(&(mk->cache_free), c);
+		    erts_circleq_push_head(&(ma->cache_free), c);
 
 		    *size_p = csize;
 
@@ -561,7 +544,7 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, UWord *size_p, Uint flag
 	    ASSERT(best->seg);
 	    ASSERT(best->size > 0);
 
-	    mk->cache_hits++;
+	    ma->cache_hits++;
 
 	    /* Use current cache placement for remaining segment space */
 
@@ -585,7 +568,7 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, UWord *size_p, Uint flag
  * using callbacks from aux-work in the scheduler.
  */
 
-static ERTS_INLINE Uint mseg_drop_one_memkind_cache_size(MemKind *mk, Uint flags, cache_t *head) {
+static ERTS_INLINE Uint mseg_drop_one_cache_size(ErtsMsegAllctr_t *ma, Uint flags, cache_t *head) {
     cache_t *c = NULL;
 
     c = erts_circleq_tail(head);
@@ -594,19 +577,19 @@ static ERTS_INLINE Uint mseg_drop_one_memkind_cache_size(MemKind *mk, Uint flags
     if (erts_mtrace_enabled)
 	erts_mtrace_crr_free(SEGTYPE, SEGTYPE, c->seg);
 
-    mseg_destroy(mk->ma, flags, mk, c->seg, c->size);
+    mseg_destroy(ma, flags, c->seg, c->size);
     mseg_cache_clear_node(c);
-    erts_circleq_push_head(&(mk->cache_free), c);
+    erts_circleq_push_head(&(ma->cache_free), c);
 
-    mk->segments.current.watermark--;
-    mk->cache_size--;
+    ma->segments.current.watermark--;
+    ma->cache_size--;
 
-    ASSERT( mk->cache_size >= 0 );
+    ASSERT(ma->cache_size >= 0);
 
-    return mk->cache_size;
+    return ma->cache_size;
 }
 
-static ERTS_INLINE Uint mseg_drop_memkind_cache_size(MemKind *mk, Uint flags, cache_t *head) {
+static ERTS_INLINE Uint mseg_drop_cache_size(ErtsMsegAllctr_t *ma, Uint flags, cache_t *head) {
     cache_t *c = NULL;
 
     while (!erts_circleq_is_empty(head)) {
@@ -617,58 +600,52 @@ static ERTS_INLINE Uint mseg_drop_memkind_cache_size(MemKind *mk, Uint flags, ca
 	if (erts_mtrace_enabled)
 	    erts_mtrace_crr_free(SEGTYPE, SEGTYPE, c->seg);
 
-	mseg_destroy(mk->ma, flags, mk, c->seg, c->size);
+	mseg_destroy(ma, flags, c->seg, c->size);
 
 	mseg_cache_clear_node(c);
-	erts_circleq_push_head(&(mk->cache_free), c);
-
-	mk->segments.current.watermark--;
-	mk->cache_size--;
+	erts_circleq_push_head(&(ma->cache_free), c);
 
+	ma->segments.current.watermark--;
+	ma->cache_size--;
     }
 
-    ASSERT( mk->cache_size >= 0 );
+    ASSERT(ma->cache_size >= 0);
 
-    return mk->cache_size;
+    return ma->cache_size;
 }
 
-/* mseg_check_memkind_cache
- * - Check if we can empty some cached segments in this
- *   MemKind.
+/* mseg_check_cache
+ * - Check if we can empty some cached segments in this allocator
  */
 
 
-static Uint mseg_check_memkind_cache(MemKind *mk) {
+static Uint mseg_check_cache(ErtsMsegAllctr_t *ma) {
     int i;
 
-    ERTS_DBG_MK_CHK_THR_ACCESS(mk);
+    ERTS_DBG_MA_CHK_THR_ACCESS(ma);
 
     for (i = 0; i < CACHE_AREAS; i++) {
-	if (!erts_circleq_is_empty(&(mk->cache_powered_node[i])))
-	    return mseg_drop_one_memkind_cache_size(mk, ERTS_MSEG_FLG_2POW, &(mk->cache_powered_node[i]));
+	if (!erts_circleq_is_empty(&(ma->cache_powered_node[i])))
+	    return mseg_drop_one_cache_size(ma, ERTS_MSEG_FLG_2POW, &(ma->cache_powered_node[i]));
     }
 
-    if (!erts_circleq_is_empty(&(mk->cache_unpowered_node)))
-	return mseg_drop_one_memkind_cache_size(mk, ERTS_MSEG_FLG_NONE, &(mk->cache_unpowered_node));
+    if (!erts_circleq_is_empty(&(ma->cache_unpowered_node)))
+	return mseg_drop_one_cache_size(ma, ERTS_MSEG_FLG_NONE, &(ma->cache_unpowered_node));
 
     return 0;
 }
 
 /* mseg_cache_check
  * - Check if we have some cache we can purge
- *   in any of the memkinds.
  */
 
 static void mseg_cache_check(ErtsMsegAllctr_t *ma) {
-    MemKind* mk;
     Uint empty_cache = 1;
 
     ERTS_MSEG_LOCK(ma);
 
-    for (mk = ma->mk_list; mk; mk = mk->next) {
-	if (mseg_check_memkind_cache(mk))
-	    empty_cache = 0;
-    }
+    if (mseg_check_cache(ma))
+        empty_cache = 0;
 
     /* If all MemKinds caches are empty,
      * remove aux-work callback
@@ -686,7 +663,7 @@ static void mseg_cache_check(ErtsMsegAllctr_t *ma) {
 /* erts_mseg_cache_check
  * - This is a callback that is scheduled as aux-work from
  *   schedulers and is called at some interval if we have a cache
- *   on this mseg-allocator and memkind.
+ *   on this mseg-allocator.
  * - Purpose: Empty cache slowly so we don't collect mapped areas
  *   and bloat memory.
  */
@@ -696,42 +673,32 @@ void erts_mseg_cache_check(void) {
 }
 
 
-/* *_mseg_clear_*_cache
+/* mseg_clear_cache
  * Remove cached segments from the allocator completely
  */
 
-static void mseg_clear_memkind_cache(MemKind *mk) {
+
+static void mseg_clear_cache(ErtsMsegAllctr_t *ma) {
     int i;
+    ERTS_MSEG_LOCK(ma);
+    ERTS_DBG_MA_CHK_THR_ACCESS(ma);
 
     /* drop pow2 caches */
     for (i = 0; i < CACHE_AREAS; i++) {
-	if (erts_circleq_is_empty(&(mk->cache_powered_node[i])))
+	if (erts_circleq_is_empty(&(ma->cache_powered_node[i])))
 	    continue;
 
-	mseg_drop_memkind_cache_size(mk, ERTS_MSEG_FLG_2POW, &(mk->cache_powered_node[i]));
-	ASSERT(erts_circleq_is_empty(&(mk->cache_powered_node[i])));
+	mseg_drop_cache_size(ma, ERTS_MSEG_FLG_2POW, &(ma->cache_powered_node[i]));
+	ASSERT(erts_circleq_is_empty(&(ma->cache_powered_node[i])));
     }
     /* drop varied caches */
-    if (!erts_circleq_is_empty(&(mk->cache_unpowered_node)))
-	mseg_drop_memkind_cache_size(mk, ERTS_MSEG_FLG_NONE, &(mk->cache_unpowered_node));
+    if (!erts_circleq_is_empty(&(ma->cache_unpowered_node)))
+	mseg_drop_cache_size(ma, ERTS_MSEG_FLG_NONE, &(ma->cache_unpowered_node));
 
-    ASSERT(erts_circleq_is_empty(&(mk->cache_unpowered_node)));
-    ASSERT(mk->cache_size == 0);
-}
-
-static void mseg_clear_cache(ErtsMsegAllctr_t *ma) {
-    MemKind* mk;
-
-    ERTS_MSEG_LOCK(ma);
-    ERTS_DBG_MA_CHK_THR_ACCESS(ma);
-
-
-    for (mk = ma->mk_list; mk; mk = mk->next) {
-	mseg_clear_memkind_cache(mk);
-    }
+    ASSERT(erts_circleq_is_empty(&(ma->cache_unpowered_node)));
+    ASSERT(ma->cache_size == 0);
 
     INC_CC(ma, clear_cache);
-
     ERTS_MSEG_UNLOCK(ma);
 }
 
@@ -740,21 +707,12 @@ void erts_mseg_clear_cache(void) {
     mseg_clear_cache(ERTS_MSEG_ALLCTR_IX(0));
 }
 
-
-
-static ERTS_INLINE MemKind* memkind(ErtsMsegAllctr_t *ma,
-				    const ErtsMsegOpt_t *opt)
-{
-    return &ma->the_mem;
-}
-
 static void *
 mseg_alloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, UWord *size_p,
 	   Uint flags, const ErtsMsegOpt_t *opt)
 {
     UWord size;
     void *seg;
-    MemKind* mk = memkind(ma, opt);
 
     INC_CC(ma, alloc);
 
@@ -768,10 +726,10 @@ mseg_alloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, UWord *size_p,
 	}
     }
 
-    if (opt->cache && mk->cache_size > 0 && (seg = cache_get_segment(mk, &size, flags)) != NULL)
+    if (opt->cache && ma->cache_size > 0 && (seg = cache_get_segment(ma, &size, flags)) != NULL)
 	goto done;
 
-    seg = mseg_create(ma, flags, mk, &size);
+    seg = mseg_create(ma, flags, &size);
 
     if (!seg)
 	*size_p = 0;
@@ -781,7 +739,7 @@ done:
 	if (erts_mtrace_enabled)
 	    erts_mtrace_crr_alloc(seg, atype, ERTS_MTRACE_SEGMENT_ID, size);
 
-	ERTS_MSEG_ALLOC_STAT(mk,size);
+	ERTS_MSEG_ALLOC_STAT(ma,size);
     }
 
     return seg;
@@ -792,11 +750,9 @@ static void
 mseg_dealloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg, UWord size,
 	     Uint flags, const ErtsMsegOpt_t *opt)
 {
-    MemKind* mk = memkind(ma, opt);
-
-    ERTS_MSEG_DEALLOC_STAT(mk,size);
+    ERTS_MSEG_DEALLOC_STAT(ma,size);
 
-    if (opt->cache && cache_bless_segment(mk, seg, size, flags)) {
+    if (opt->cache && cache_bless_segment(ma, seg, size, flags)) {
 	schedule_cache_check(ma);
 	goto done;
     }
@@ -804,7 +760,7 @@ mseg_dealloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg, UWord size,
     if (erts_mtrace_enabled)
 	erts_mtrace_crr_free(atype, SEGTYPE, seg);
 
-    mseg_destroy(ma, flags, mk, seg, size);
+    mseg_destroy(ma, flags, seg, size);
 
 done:
 
@@ -815,7 +771,6 @@ static void *
 mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg,
 	     UWord old_size, UWord *new_size_p, Uint flags, const ErtsMsegOpt_t *opt)
 {
-    MemKind* mk;
     void *new_seg;
     UWord new_size;
 
@@ -834,7 +789,6 @@ mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg,
 	return NULL;
     }
 
-    mk = memkind(ma, opt);
     new_seg = seg;
 
     if (!MSEG_FLG_IS_2POW(flags))
@@ -849,7 +803,7 @@ mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg,
 
     if (new_size > old_size) {
 	if (opt->preserv) {
-	    new_seg = mseg_recreate(ma, flags, mk, (void *) seg, old_size, &new_size);
+	    new_seg = mseg_recreate(ma, flags, (void *) seg, old_size, &new_size);
 	    if (!new_seg)
 		new_size = old_size;
 	}
@@ -869,7 +823,7 @@ mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg,
 	    new_size = old_size;
 	}
 	else {
-	    new_seg = mseg_recreate(ma, flags, mk, (void *) seg, old_size, &new_size);
+	    new_seg = mseg_recreate(ma, flags, (void *) seg, old_size, &new_size);
 	    if (!new_seg)
 		new_size = old_size;
 	}
@@ -883,7 +837,7 @@ mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg,
     ASSERT(!MSEG_FLG_IS_2POW(flags) || IS_2POW(new_size));
     *new_size_p = new_size;
 
-    ERTS_MSEG_REALLOC_STAT(mk, old_size, new_size);
+    ERTS_MSEG_REALLOC_STAT(ma, old_size, new_size);
 
     return new_seg;
 }
@@ -1153,63 +1107,63 @@ info_calls(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg, Uint **hpp
 }
 
 static Eterm
-info_status(ErtsMsegAllctr_t *ma, MemKind* mk, int *print_to_p, void *print_to_arg,
+info_status(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg,
 	    int begin_new_max_period, Uint **hpp, Uint *szp)
 {
     Eterm res = THE_NON_VALUE;
     
-    if (mk->segments.max_ever.no < mk->segments.max.no)
-	mk->segments.max_ever.no = mk->segments.max.no;
-    if (mk->segments.max_ever.sz < mk->segments.max.sz)
-	mk->segments.max_ever.sz = mk->segments.max.sz;
+    if (ma->segments.max_ever.no < ma->segments.max.no)
+	ma->segments.max_ever.no = ma->segments.max.no;
+    if (ma->segments.max_ever.sz < ma->segments.max.sz)
+	ma->segments.max_ever.sz = ma->segments.max.sz;
 
     if (print_to_p) {
 	int to = *print_to_p;
 	void *arg = print_to_arg;
 
-	erts_print(to, arg, "cached_segments: %beu\n", mk->cache_size);
-	erts_print(to, arg, "cache_hits: %beu\n", mk->cache_hits);
+	erts_print(to, arg, "cached_segments: %beu\n", ma->cache_size);
+	erts_print(to, arg, "cache_hits: %beu\n", ma->cache_hits);
 	erts_print(to, arg, "segments: %beu %beu %beu\n",
-		   mk->segments.current.no, mk->segments.max.no, mk->segments.max_ever.no);
+		   ma->segments.current.no, ma->segments.max.no, ma->segments.max_ever.no);
 	erts_print(to, arg, "segments_size: %beu %beu %beu\n",
-		   mk->segments.current.sz, mk->segments.max.sz, mk->segments.max_ever.sz);
+		   ma->segments.current.sz, ma->segments.max.sz, ma->segments.max_ever.sz);
 	erts_print(to, arg, "segments_watermark: %beu\n",
-		   mk->segments.current.watermark);
+		   ma->segments.current.watermark);
     }
 
     if (hpp || szp) {
 	res = NIL;
 	add_2tup(hpp, szp, &res,
 		 am.segments_watermark,
-		 bld_unstable_uint(hpp, szp, mk->segments.current.watermark));
+		 bld_unstable_uint(hpp, szp, ma->segments.current.watermark));
 	add_4tup(hpp, szp, &res,
 		 am.segments_size,
-		 bld_unstable_uint(hpp, szp, mk->segments.current.sz),
-		 bld_unstable_uint(hpp, szp, mk->segments.max.sz),
-		 bld_unstable_uint(hpp, szp, mk->segments.max_ever.sz));
+		 bld_unstable_uint(hpp, szp, ma->segments.current.sz),
+		 bld_unstable_uint(hpp, szp, ma->segments.max.sz),
+		 bld_unstable_uint(hpp, szp, ma->segments.max_ever.sz));
 	add_4tup(hpp, szp, &res,
 		 am.segments,
-		 bld_unstable_uint(hpp, szp, mk->segments.current.no),
-		 bld_unstable_uint(hpp, szp, mk->segments.max.no),
-		 bld_unstable_uint(hpp, szp, mk->segments.max_ever.no));
+		 bld_unstable_uint(hpp, szp, ma->segments.current.no),
+		 bld_unstable_uint(hpp, szp, ma->segments.max.no),
+		 bld_unstable_uint(hpp, szp, ma->segments.max_ever.no));
 	add_2tup(hpp, szp, &res,
 		 am.cache_hits,
-		 bld_unstable_uint(hpp, szp, mk->cache_hits));
+		 bld_unstable_uint(hpp, szp, ma->cache_hits));
 	add_2tup(hpp, szp, &res,
 		 am.cached_segments,
-		 bld_unstable_uint(hpp, szp, mk->cache_size));
+		 bld_unstable_uint(hpp, szp, ma->cache_size));
 
     }
 
     if (begin_new_max_period) {
-	mk->segments.max.no = mk->segments.current.no;
-	mk->segments.max.sz = mk->segments.current.sz;
+	ma->segments.max.no = ma->segments.current.no;
+	ma->segments.max.sz = ma->segments.current.sz;
     }
 
     return res;
 }
 
-static Eterm info_memkind(ErtsMsegAllctr_t *ma, MemKind* mk, int *print_to_p, void *print_to_arg,
+static Eterm info_memkind(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg,
 			  int begin_max_per, Uint **hpp, Uint *szp)
 {
     Eterm res = THE_NON_VALUE;
@@ -1217,15 +1171,15 @@ static Eterm info_memkind(ErtsMsegAllctr_t *ma, MemKind* mk, int *print_to_p, vo
     Eterm values[3];
 
     if (print_to_p) {
-	erts_print(*print_to_p, print_to_arg, "memory kind: %s\n", mk->name);
+	erts_print(*print_to_p, print_to_arg, "memory kind: %s\n", "all memory");
     }
     if (hpp || szp) {
 	atoms[0] = am.name;
 	atoms[1] = am.status;
 	atoms[2] = am.calls;
-	values[0] = erts_bld_string(hpp, szp, mk->name);
+	values[0] = erts_bld_string(hpp, szp, "all memory");
     }
-    values[1] = info_status(ma, mk, print_to_p, print_to_arg, begin_max_per, hpp, szp);
+    values[1] = info_status(ma, print_to_p, print_to_arg, begin_max_per, hpp, szp);
     values[2] = info_calls(ma, print_to_p, print_to_arg, hpp, szp);
 
     if (hpp || szp)
@@ -1234,7 +1188,6 @@ static Eterm info_memkind(ErtsMsegAllctr_t *ma, MemKind* mk, int *print_to_p, vo
     return res;
 }
 
-
 static Eterm
 info_version(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg, Uint **hpp, Uint *szp)
 {
@@ -1299,7 +1252,7 @@ erts_mseg_info(int ix,
     ERTS_MSEG_LOCK(ma);
     ERTS_DBG_MA_CHK_THR_ACCESS(ma);
 
-    values[n++] = info_memkind(ma, &ma->the_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp);
+    values[n++] = info_memkind(ma, print_to_p, print_to_arg, begin_max_per, hpp, szp);
     if (hpp || szp)
 	res = bld_2tup_list(hpp, szp, n, atoms, values);
 
@@ -1376,13 +1329,10 @@ Uint
 erts_mseg_no(const ErtsMsegOpt_t *opt)
 {
     ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt);
-    MemKind* mk;
-    Uint n = 0;
+    Uint n;
     ERTS_MSEG_LOCK(ma);
     ERTS_DBG_MA_CHK_THR_ACCESS(ma);
-    for (mk=ma->mk_list; mk; mk=mk->next) {
-	n += mk->segments.current.no;
-    }
+    n = ma->segments.current.no;
     ERTS_MSEG_UNLOCK(ma);
     return n;
 }
@@ -1394,16 +1344,16 @@ erts_mseg_unit_size(void)
 }
 
 
-static void mem_kind_init(ErtsMsegAllctr_t *ma, MemKind* mk, const char* name)
+static void mem_cache_init(ErtsMsegAllctr_t *ma)
 {
     int i;
 
     /* Clear all cache headers */
-    mseg_cache_clear_node(&(mk->cache_free));
-    mseg_cache_clear_node(&(mk->cache_unpowered_node));
+    mseg_cache_clear_node(&(ma->cache_free));
+    mseg_cache_clear_node(&(ma->cache_unpowered_node));
 
     for (i = 0; i < CACHE_AREAS; i++) {
-	mseg_cache_clear_node(&(mk->cache_powered_node[i]));
+	mseg_cache_clear_node(&(ma->cache_powered_node[i]));
     }
 
     /* Populate cache free list */
@@ -1411,25 +1361,20 @@ static void mem_kind_init(ErtsMsegAllctr_t *ma, MemKind* mk, const char* name)
     ASSERT(ma->max_cache_size <= MAX_CACHE_SIZE);
 
     for (i = 0; i < ma->max_cache_size; i++) {
-	mseg_cache_clear_node(&(mk->cache[i]));
-	erts_circleq_push_head(&(mk->cache_free), &(mk->cache[i]));
+	mseg_cache_clear_node(&(ma->cache[i]));
+	erts_circleq_push_head(&(ma->cache_free), &(ma->cache[i]));
     }
 
-    mk->cache_size = 0;
-    mk->cache_hits = 0;
-
-    mk->segments.current.watermark = 0;
-    mk->segments.current.no = 0;
-    mk->segments.current.sz = 0;
-    mk->segments.max.no = 0;
-    mk->segments.max.sz = 0;
-    mk->segments.max_ever.no = 0;
-    mk->segments.max_ever.sz = 0;
-
-    mk->ma = ma;
-    mk->name = name;
-    mk->next = ma->mk_list;
-    ma->mk_list = mk;
+    ma->cache_size = 0;
+    ma->cache_hits = 0;
+
+    ma->segments.current.watermark = 0;
+    ma->segments.current.no = 0;
+    ma->segments.current.sz = 0;
+    ma->segments.max.no = 0;
+    ma->segments.max.sz = 0;
+    ma->segments.max_ever.no = 0;
+    ma->segments.max_ever.sz = 0;
 }
 
 void
@@ -1488,9 +1433,7 @@ erts_mseg_init(ErtsMsegInit_t *init)
 	if (ma->max_cache_size > MAX_CACHE_SIZE)
 	    ma->max_cache_size = MAX_CACHE_SIZE;
 
-	ma->mk_list = NULL;
-
-	mem_kind_init(ma, &ma->the_mem, "all memory");
+	mem_cache_init(ma);
 
 	sys_memzero((void *) &ma->calls, sizeof(ErtsMsegCalls));
     }
@@ -1499,13 +1442,8 @@ erts_mseg_init(ErtsMsegInit_t *init)
 
 static ERTS_INLINE Uint tot_cache_size(ErtsMsegAllctr_t *ma)
 {
-    MemKind* mk;
-    Uint sz = 0;
     ERTS_DBG_MA_CHK_THR_ACCESS(ma);
-    for (mk=ma->mk_list; mk; mk=mk->next) {
-	sz += mk->cache_size;
-    }
-    return sz;
+    return ma->cache_size;
 }
 
 /*
-- 
cgit v1.2.3


From c431a065ba515d27830f01c852f70940efb3003b Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas.larsson@erlang-solutions.com>
Date: Thu, 2 Jul 2015 11:13:32 +0200
Subject: ose: Remove all code related to the OSE port

The OSE port is no longer supported and this commit removed it
and any changes related to it. The things that were general
improvements have been left in the code.
---
 erts/emulator/sys/common/erl_check_io.c    |   24 -
 erts/emulator/sys/common/erl_poll.h        |   22 +-
 erts/emulator/sys/ose/beam.lmconf          |   26 -
 erts/emulator/sys/ose/driver_int.h         |   42 -
 erts/emulator/sys/ose/erl_main.c           |   54 -
 erts/emulator/sys/ose/erl_ose_sys.h        |  356 ------
 erts/emulator/sys/ose/erl_ose_sys_ddll.c   |  127 --
 erts/emulator/sys/ose/erl_poll.c           |  818 ------------
 erts/emulator/sys/ose/erts.sig             |   17 -
 erts/emulator/sys/ose/gcc_4.4.3_lm_ppc.lcf |  182 ---
 erts/emulator/sys/ose/gcc_4.6.3_lm_ppc.lcf |  242 ----
 erts/emulator/sys/ose/sys.c                | 1847 ----------------------------
 erts/emulator/sys/ose/sys_float.c          |  845 -------------
 erts/emulator/sys/ose/sys_time.c           |   57 -
 14 files changed, 2 insertions(+), 4657 deletions(-)
 delete mode 100644 erts/emulator/sys/ose/beam.lmconf
 delete mode 100644 erts/emulator/sys/ose/driver_int.h
 delete mode 100644 erts/emulator/sys/ose/erl_main.c
 delete mode 100644 erts/emulator/sys/ose/erl_ose_sys.h
 delete mode 100644 erts/emulator/sys/ose/erl_ose_sys_ddll.c
 delete mode 100644 erts/emulator/sys/ose/erl_poll.c
 delete mode 100644 erts/emulator/sys/ose/erts.sig
 delete mode 100644 erts/emulator/sys/ose/gcc_4.4.3_lm_ppc.lcf
 delete mode 100644 erts/emulator/sys/ose/gcc_4.6.3_lm_ppc.lcf
 delete mode 100644 erts/emulator/sys/ose/sys.c
 delete mode 100644 erts/emulator/sys/ose/sys_float.c
 delete mode 100644 erts/emulator/sys/ose/sys_time.c

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_check_io.c b/erts/emulator/sys/common/erl_check_io.c
index 105b129065..f87196d724 100644
--- a/erts/emulator/sys/common/erl_check_io.c
+++ b/erts/emulator/sys/common/erl_check_io.c
@@ -1337,11 +1337,7 @@ print_select_op(erts_dsprintf_buf_t *dsbufp,
 {
     Port *pp = erts_drvport2port(ix);
     erts_dsprintf(dsbufp,
-#ifdef __OSE__
-		  "driver_select(%p, %d,%s%s%s%s | %d, %d) "
-#else
 		  "driver_select(%p, %d,%s%s%s%s, %d) "
-#endif
 		  "by ",
 		  ix,
 		  (int) GET_FD(fd),
@@ -1861,25 +1857,6 @@ stale_drv_select(Eterm id, ErtsDrvEventState *state, int mode)
 
 #ifndef ERTS_SYS_CONTINOUS_FD_NUMBERS
 
-#ifdef __OSE__
-static SafeHashValue drv_ev_state_hash(void *des)
-{
-    ErtsSysFdType fd = ((ErtsDrvEventState *) des)->fd;
-    /* We use hash on signo ^ id in order for steal to happen when the
-       same signo + fd is selected on by two different ports */
-    SafeHashValue val = (SafeHashValue)(fd->signo ^ fd->id);
-    return val ^ (val >> 8);
-}
-
-static int drv_ev_state_cmp(void *des1, void *des2)
-{
-    ErtsSysFdType fd1 = ((ErtsDrvEventState *) des1)->fd;
-    ErtsSysFdType fd2 = ((ErtsDrvEventState *) des2)->fd;
-    if (fd1->signo == fd2->signo && fd1->id == fd2->id)
-      return 0;
-    return 1;
-}
-#else /* !__OSE__ && !ERTS_SYS_CONTINOUS_FD_NUMBERS i.e. probably windows */
 static SafeHashValue drv_ev_state_hash(void *des)
 {
     SafeHashValue val = (SafeHashValue) ((ErtsDrvEventState *) des)->fd;
@@ -1891,7 +1868,6 @@ static int drv_ev_state_cmp(void *des1, void *des2)
     return ( ((ErtsDrvEventState *) des1)->fd == ((ErtsDrvEventState *) des2)->fd
 	    ? 0 : 1);
 }
-#endif
 
 static void *drv_ev_state_alloc(void *des_tmpl)
 {
diff --git a/erts/emulator/sys/common/erl_poll.h b/erts/emulator/sys/common/erl_poll.h
index 19ce582154..6d8aef822e 100644
--- a/erts/emulator/sys/common/erl_poll.h
+++ b/erts/emulator/sys/common/erl_poll.h
@@ -93,7 +93,7 @@
 #  if defined(ERTS_USE_POLL)
 #    undef ERTS_POLL_USE_POLL
 #    define ERTS_POLL_USE_POLL 1
-#  elif !defined(__WIN32__) && !defined(__OSE__)
+#  elif !defined(__WIN32__)
 #    undef ERTS_POLL_USE_SELECT
 #    define ERTS_POLL_USE_SELECT 1
 #  endif
@@ -104,31 +104,13 @@
 typedef Uint32 ErtsPollEvents;
 #undef ERTS_POLL_EV_E2N
 
-#if defined(__WIN32__) || defined(__OSE__)	/* --- win32 or ose -------- */
+#if defined(__WIN32__)	/* --- win32  --------------------------------------- */
 
 #define ERTS_POLL_EV_IN   1
 #define ERTS_POLL_EV_OUT  2
 #define ERTS_POLL_EV_ERR  4
 #define ERTS_POLL_EV_NVAL 8
 
-#ifdef __OSE__
-
-typedef struct ErtsPollOseMsgList_ {
-  struct ErtsPollOseMsgList_ *next;
-  union SIGNAL *data;
-} ErtsPollOseMsgList;
-
-struct erts_sys_fd_type {
-    SIGSELECT signo;
-    ErlDrvOseEventId id;
-    ErtsPollOseMsgList *msgs;
-    ErlDrvOseEventId (*resolve_signal)(union SIGNAL *sig);
-    ethr_mutex mtx;
-    void *extra;
-};
-
-#endif
-
 #elif ERTS_POLL_USE_EPOLL	/* --- epoll ------------------------------- */
 
 #include <sys/epoll.h>
diff --git a/erts/emulator/sys/ose/beam.lmconf b/erts/emulator/sys/ose/beam.lmconf
deleted file mode 100644
index 4ad46b01d9..0000000000
--- a/erts/emulator/sys/ose/beam.lmconf
+++ /dev/null
@@ -1,26 +0,0 @@
-OSE_LM_STACK_SIZES=256,512,1024,2048,4096,8192,16384,65536
-OSE_LM_SIGNAL_SIZES=31,63,127,255,1023,4095,16383,65535
-OSE_LM_POOL_SIZE=0x200000
-OSE_LM_MAIN_NAME=main
-OSE_LM_MAIN_STACK_SIZE=0xF000
-OSE_LM_MAIN_PRIORITY=20
-## Has to be of a type that allows MAM
-OSE_LM_PROGRAM_TYPE=APP_RAM
-OSE_LM_DATA_INIT=YES
-OSE_LM_BSS_INIT=YES
-OSE_LM_EXEC_MODEL=SHARED
-HEAP_MAX_SIZE=1000000000
-HEAP_SMALL_BUF_INIT_SIZE=20971520
-HEAP_LARGE_BUF_THRESHOLD=16000000
-HEAP_LOCK_TYPE=2
-
-ERTS_DEFAULT_PRIO=24
-ERTS_SCHEDULER_PRIO=24
-ERTS_ASYNC_PRIO=22
-ERTS_AUX_PRIO=24
-ERTS_SYS_MSG_DISPATCHER_PRIO=21
-
-# Setting the environment variable EFS_RESOLVE_TMO on the block to 0.
-# This will eliminiate delays when trying to open files on not mounted
-# volumes.
-EFS_RESOLVE_TMO=0
diff --git a/erts/emulator/sys/ose/driver_int.h b/erts/emulator/sys/ose/driver_int.h
deleted file mode 100644
index 4a5b7171d1..0000000000
--- a/erts/emulator/sys/ose/driver_int.h
+++ /dev/null
@@ -1,42 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 1997-2009. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-/*
- * System dependant driver declarations
- */
-
-#ifndef __DRIVER_INT_H__
-#define __DRIVER_INT_H__
-
-#ifdef HAVE_SYS_UIO_H
-#include <sys/types.h>
-#include <sys/uio.h>
-
-typedef struct iovec SysIOVec;
-
-#else
-
-typedef struct {
-    char* iov_base;
-    int   iov_len;
-} SysIOVec;
-
-#endif
-
-#endif
diff --git a/erts/emulator/sys/ose/erl_main.c b/erts/emulator/sys/ose/erl_main.c
deleted file mode 100644
index 877e85f43a..0000000000
--- a/erts/emulator/sys/ose/erl_main.c
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2000-2009. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-#include <stdlib.h>
-
-#include "sys.h"
-#include "erl_vm.h"
-#include "global.h"
-#include "ose.h"
-
-int
-main(int argc, char **argv) {
-
-  (void)stdin;(void)stdout;(void)stderr;
-
-  /* When starting using pm_create -c ARGV="-- -root ..", argv[0] is the first
-     part of ARGV and not the name of the executable. So we shuffle some
-     pointers here to make erl_start happy. */
-  if (argv[0][0] == '-') {
-    int i;
-    char **tmp_argv = malloc(sizeof(char*)*(argc+1));
-    for (i = 0; i < argc; i++)
-      tmp_argv[i+1] = argv[i];
-    tmp_argv[0] = "beam";
-    erl_start(argc+1,tmp_argv);
-    free(tmp_argv);
-  } else {
-   erl_start(argc,argv);
-  }
-
-   stop(current_process());
-
-   return 0;
-}
diff --git a/erts/emulator/sys/ose/erl_ose_sys.h b/erts/emulator/sys/ose/erl_ose_sys.h
deleted file mode 100644
index d0cd3180bf..0000000000
--- a/erts/emulator/sys/ose/erl_ose_sys.h
+++ /dev/null
@@ -1,356 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 1997-2011. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- *
- * This file handles differences between different Unix systems.
- * This should be the only place with conditional compilation
- * depending on the type of OS.
- */
-
-#ifndef _ERL_OSE_SYS_H
-#define _ERL_OSE_SYS_H
-
-#include "ose.h"
-#undef NIL
-#include "ramlog.h"
-#include "erts.sig"
-
-#include "fcntl.h"
-#include "math.h"
-#include "stdio.h"
-#include "stdlib.h"
-#include "string.h"
-#include "sys/param.h"
-#include "sys/time.h"
-#include "time.h"
-#include "dirent.h"
-#include "ethread.h"
-
-/* FIXME: configuration options */
-#define ERTS_SCHED_MIN_SPIN 1
-#define ERTS_SCHED_ONLY_POLL_SCHED_1 1
-#define ERTS_SCHED_FAIR 1
-#define NO_SYSCONF 1
-#define OPEN_MAX FOPEN_MAX
-
-#define MAP_ANON MAP_ANONYMOUS
-
-#ifndef HAVE_MMAP
-#   define HAVE_MMAP 0
-#endif
-
-#if HAVE_MMAP
-#   include "sys/mman.h"
-#endif
-
-/*
- * Min number of async threads
- */
-#define ERTS_MIN_NO_OF_ASYNC_THREADS 1
-
-/*
- * Our own type of "FD's"
- */
-#define ERTS_SYS_FD_TYPE struct erts_sys_fd_type*
-#define NO_FSTAT_ON_SYS_FD_TYPE 1 /* They are signals, not files */
-
-#include "sys/stat.h"
-
-/* FIXME mremap is not defined in OSE - POSIX issue */
-extern void *mremap (void *__addr, size_t __old_len, size_t __new_len,
-                        int __flags, ...);
-
-/* FIXME: mremap constants */
-#define MREMAP_MAYMOVE  1
-#define MREMAP_FIXED    2
-
-typedef void *GETENV_STATE;
-
-/*
-** For the erl_timer_sup module.
-*/
-#define HAVE_GETHRTIME
-
-typedef long long SysHrTime;
-extern SysHrTime sys_gethrtime(void);
-
-void sys_init_hrtime(void);
-
-typedef time_t erts_time_t;
-
-typedef struct timeval SysTimeval;
-
-#define sys_gettimeofday(Arg) ((void) gettimeofday((Arg), NULL))
-
-typedef struct {
-    clock_t tms_utime;
-    clock_t tms_stime;
-    clock_t tms_cutime;
-    clock_t tms_cstime;
-} SysTimes;
-
-extern int erts_ticks_per_sec;
-
-#define SYS_CLK_TCK (erts_ticks_per_sec)
-
-extern clock_t sys_times(SysTimes *buffer);
-
-/* No use in having other resolutions than 1 Ms. */
-#define SYS_CLOCK_RESOLUTION 1
-
-#define erts_isfinite finite
-
-#ifdef NO_FPE_SIGNALS
-
-#define erts_get_current_fp_exception() NULL
-#ifdef ERTS_SMP
-#define erts_thread_init_fp_exception() do{}while(0)
-#endif
-#  define __ERTS_FP_CHECK_INIT(fpexnp) do {} while (0)
-#  define __ERTS_FP_ERROR(fpexnp, f, Action) if (!finite(f)) { Action; } else {}
-#  define __ERTS_FP_ERROR_THOROUGH(fpexnp, f, Action) __ERTS_FP_ERROR(fpexnp, f, Action)
-#  define __ERTS_SAVE_FP_EXCEPTION(fpexnp)
-#  define __ERTS_RESTORE_FP_EXCEPTION(fpexnp)
-
-#define erts_sys_block_fpe() 0
-#define erts_sys_unblock_fpe(x) do{}while(0)
-
-#else /* !NO_FPE_SIGNALS */
-
-extern volatile unsigned long *erts_get_current_fp_exception(void);
-#ifdef ERTS_SMP
-extern void erts_thread_init_fp_exception(void);
-#endif
-#  if (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__)
-#    define erts_fwait(fpexnp,f) \
-	__asm__ __volatile__("fwait" : "=m"(*(fpexnp)) : "m"(f))
-#  elif (defined(__powerpc__) || defined(__ppc__)) && defined(__GNUC__)
-#    define erts_fwait(fpexnp,f) \
-	__asm__ __volatile__("" : "=m"(*(fpexnp)) : "fm"(f))
-#  elif defined(__sparc__) && defined(__linux__) && defined(__GNUC__)
-#    define erts_fwait(fpexnp,f) \
-	__asm__ __volatile__("" : "=m"(*(fpexnp)) : "em"(f))
-#  else
-#    define erts_fwait(fpexnp,f) \
-	__asm__ __volatile__("" : "=m"(*(fpexnp)) : "g"(f))
-#  endif
-#  if (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__)
-     extern void erts_restore_fpu(void);
-#  else
-#    define erts_restore_fpu() /*empty*/
-#  endif
-#  if (!defined(__GNUC__) || \
-       (__GNUC__ < 2) || \
-       (__GNUC__ == 2 && __GNUC_MINOR < 96)) && \
-      !defined(__builtin_expect)
-#    define __builtin_expect(x, expected_value) (x)
-#  endif
-static __inline__ int erts_check_fpe(volatile unsigned long *fp_exception, double f)
-{
-    erts_fwait(fp_exception, f);
-    if (__builtin_expect(*fp_exception == 0, 1))
-       return 0;
-    *fp_exception = 0;
-    erts_restore_fpu();
-    return 1;
-}
-#  undef erts_fwait
-#  undef erts_restore_fpu
-extern void erts_fp_check_init_error(volatile unsigned long *fp_exception);
-static __inline__ void __ERTS_FP_CHECK_INIT(volatile unsigned long *fp_exception)
-{
-    if (__builtin_expect(*fp_exception == 0, 1))
-	return;
-    erts_fp_check_init_error(fp_exception);
-}
-#  define __ERTS_FP_ERROR(fpexnp, f, Action) do { if (erts_check_fpe((fpexnp),(f))) { Action; } } while (0)
-#  define __ERTS_SAVE_FP_EXCEPTION(fpexnp) unsigned long old_erl_fp_exception = *(fpexnp)
-#  define __ERTS_RESTORE_FP_EXCEPTION(fpexnp) \
-              do { *(fpexnp) = old_erl_fp_exception; } while (0)
-   /* This is for library calls where we don't trust the external
-      code to always throw floating-point exceptions on errors. */
-static __inline__ int erts_check_fpe_thorough(volatile unsigned long *fp_exception, double f)
-{
-    return erts_check_fpe(fp_exception, f) || !finite(f);
-}
-#  define __ERTS_FP_ERROR_THOROUGH(fpexnp, f, Action) \
-  do { if (erts_check_fpe_thorough((fpexnp),(f))) { Action; } } while (0)
-
-int erts_sys_block_fpe(void);
-void erts_sys_unblock_fpe(int);
-
-#endif /* !NO_FPE_SIGNALS */
-
-#define ERTS_FP_CHECK_INIT(p)		__ERTS_FP_CHECK_INIT(&(p)->fp_exception)
-#define ERTS_FP_ERROR(p, f, A)		__ERTS_FP_ERROR(&(p)->fp_exception, f, A)
-#define ERTS_FP_ERROR_THOROUGH(p, f, A)	__ERTS_FP_ERROR_THOROUGH(&(p)->fp_exception, f, A)
-
-/* FIXME: force HAVE_GETPAGESIZE and stub getpagesize */
-#ifndef HAVE_GETPAGESIZE
-#define HAVE_GETPAGESIZE 1
-#endif
-
-extern int getpagesize(void);
-
-#ifndef HZ
-#define HZ 60
-#endif
-
-/* OSE5 doesn't provide limits.h so a number of macros should be
- * added manually */
-
-#ifndef CHAR_BIT
-#define CHAR_BIT 8
-#endif
-
-/* Minimum and maximum values a `signed int' can hold.  */
-#ifndef INT_MAX
-#define INT_MAX	2147483647
-#endif
-
-#ifndef INT_MIN
-#define INT_MIN	(-INT_MAX - 1)
-#endif
-
-#ifndef UINT_MAX
-#  define UINT_MAX   4294967295U
-#endif
-
-/*
-static void erts_ose_sys_send(union SIGNAL **signal,PROCESS dst,
-			      char* file,int line) {
-  SIGSELECT **ziggy = (SIGSELECT**)signal;
-  printf("%s:%d 0x%x Send signal 0x%x(0x%x) to 0x%x\r\n",
-	 file,line,current_process(),ziggy[0][0],*ziggy,dst);
-  send(signal,dst);
-}
-#define send(signal,dst) erts_ose_sys_send(signal,dst,__FILE__,__LINE__)
-
-static void erts_ose_sys_send_w_sender(union SIGNAL **signal,
-				       PROCESS sender,PROCESS dst,
-				       char* file,int line) {
-  SIGSELECT **ziggy = (SIGSELECT**)signal;
-  printf("%s:%d 0x%x Send signal 0x%x(0x%x) to 0x%x as 0x%x\r\n",
-	 file,line,current_process(),ziggy[0][0],*ziggy,dst,sender);
-  send_w_sender(signal,sender,dst);
-}
-#define send_w_sender(signal,sender,dst) \
-  erts_ose_sys_send_w_sender(signal,sender,dst,__FILE__,__LINE__)
-
-
-static union SIGNAL *erts_ose_sys_receive(SIGSELECT *sigsel,
-					  char *file,
-					  int line) {
-  SIGSELECT *sig;
-  int i;
-
-  printf("%s:%d 0x%x receive({%d,",file,line,current_process(),sigsel[0]);
-  for (i = 1; i < sigsel[0]; i++)
-    printf("0x%x, ",sigsel[i]);
-  if (sigsel[0] != 0)
-    printf("0x%x",sigsel[i]);
-  printf("})\n");
-  sig = (SIGSELECT*)receive(sigsel);
-  printf("%s:%d 0x%x got 0x%x from 0x%x\n",file,line,current_process(),
-	 *sig,sender((union SIGNAL**)(&sig)));
-  return (union SIGNAL*)sig;
-}
-#define receive(SIGSEL) erts_ose_sys_receive(SIGSEL,__FILE__,__LINE__)
-
-static union SIGNAL *erts_ose_sys_receive_w_tmo(OSTIME tmo,SIGSELECT *sigsel,
-						char *file,int line) {
-  SIGSELECT *sig;
-  int i;
-  if (tmo == 0) {
-    sig = (SIGSELECT*)receive_w_tmo(tmo,sigsel);
-    if (sig != NULL) {
-      printf("%s:%d 0x%x receive_w_tmo(0,{%d,",file,line,current_process(),
-	     sigsel[0]);
-      for (i = 1; i < sigsel[0]; i++)
-	printf("0x%x, ",sigsel[i]);
-      if (sigsel[0] != 0)
-	printf("0x%x",sigsel[i]);
-      printf("})\n");
-      printf("%s:%d 0x%x got 0x%x from 0x%x\n",file,line,current_process(),
-	     *sig,sender((union SIGNAL**)(&sig)));
-    }
-  } else {
-    printf("%s:%d 0x%x receive_w_tmo(%u,{%d,",file,line,current_process(),tmo,
-	   sigsel[0]);
-      for (i = 1; i < sigsel[0]; i++)
-	printf("0x%x, ",sigsel[i]);
-      if (sigsel[0] != 0)
-	printf("0x%x",sigsel[i]);
-      printf("})\n");
-      sig = (SIGSELECT*)receive_w_tmo(tmo,sigsel);
-      printf("%s:%d 0x%x got ",file,line,current_process());
-      if (sig == NULL)
-	printf("TIMEOUT\n");
-      else
-	printf("0x%x from 0x%x\n",*sig,sender((union SIGNAL**)(&sig)));
-  }
-
-  return (union SIGNAL*)sig;
-}
-
-#define receive_w_tmo(tmo,sigsel) erts_ose_sys_receive_w_tmo(tmo,sigsel, \
-							     __FILE__,__LINE__)
-
-static union SIGNAL *erts_ose_sys_receive_fsem(OSTIME tmo,SIGSELECT *sigsel,
-					       OSFSEMVAL fsem,
-					       char *file,int line) {
-  SIGSELECT *sig;
-  int i;
-  if (tmo == 0) {
-    sig = (SIGSELECT*)receive_fsem(tmo,sigsel,fsem);
-    if (sig != NULL && sig != OS_RCV_FSEM) {
-      printf("%s:%d 0x%x receive_fsem(0,{%d,",file,line,current_process(),
-	     sigsel[0]);
-      for (i = 1; i < sigsel[0]; i++)
-	printf("0x%x, ",sigsel[i]);
-      if (sigsel[0] != 0)
-	printf("0x%x",sigsel[i]);
-      printf("},%d)\n",fsem);
-      printf("%s:%d 0x%x got 0x%x from 0x%x\n",file,line,current_process(),
-	     *sig,sender((union SIGNAL**)(&sig)));
-    }
-  } else {
-    printf("%s:%d 0x%x receive_fsem(%u,{%d,",file,line,current_process(),tmo,
-	   sigsel[0]);
-      for (i = 1; i < sigsel[0]; i++)
-	printf("0x%x, ",sigsel[i]);
-      if (sigsel[0] != 0)
-	printf("0x%x",sigsel[i]);
-      printf("},%d)\n",fsem);
-      sig = (SIGSELECT*)receive_fsem(tmo,sigsel,fsem);
-      printf("%s:%d 0x%x got ",file,line,current_process());
-      if (sig == NULL)
-	printf("TIMEOUT\n");
-      else if (sig == OS_RCV_FSEM)
-	printf("FSEM\n");
-      else
-	printf("0x%x from 0x%x\n",*sig,sender((union SIGNAL**)(&sig)));
-  }
-
-  return (union SIGNAL*)sig;
-}
-
-#define receive_fsem(tmo,sigsel,fsem) \
-  erts_ose_sys_receive_fsem(tmo,sigsel,fsem,__FILE__,__LINE__)
-*/
-#endif  /* _ERL_OSE_SYS_H */
diff --git a/erts/emulator/sys/ose/erl_ose_sys_ddll.c b/erts/emulator/sys/ose/erl_ose_sys_ddll.c
deleted file mode 100644
index 5051f7fcc1..0000000000
--- a/erts/emulator/sys/ose/erl_ose_sys_ddll.c
+++ /dev/null
@@ -1,127 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2006-2013. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-
-/*
- * Interface functions to the dynamic linker using dl* functions.
- * (No support in OSE, we use static linkage instead)
- */
-
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-
-#include "sys.h"
-#include "erl_vm.h"
-#include "global.h"
-
-
-void erl_sys_ddll_init(void) {
-}
-
-/*
- * Open a shared object
- */
-int erts_sys_ddll_open(const char *full_name, void **handle, ErtsSysDdllError* err)
-{
-   return ERL_DE_ERROR_NO_DDLL_FUNCTIONALITY;
-}
-
-int erts_sys_ddll_open_noext(char *dlname, void **handle, ErtsSysDdllError* err)
-{
-   return ERL_DE_ERROR_NO_DDLL_FUNCTIONALITY;
-}
-
-/*
- * Find a symbol in the shared object
- */
-int erts_sys_ddll_sym2(void *handle, const char *func_name, void **function,
-		       ErtsSysDdllError* err)
-{
-   return ERL_DE_ERROR_NO_DDLL_FUNCTIONALITY;
-}
-
-/* XXX:PaN These two will be changed with new driver interface! */
-
-/*
- * Load the driver init function, might appear under different names depending on object arch...
- */
-
-int erts_sys_ddll_load_driver_init(void *handle, void **function)
-{
-    void *fn;
-    int res;
-    if ((res = erts_sys_ddll_sym2(handle, "driver_init", &fn, NULL)) != ERL_DE_NO_ERROR) {
-	res = erts_sys_ddll_sym2(handle, "_driver_init", &fn, NULL);
-    }
-    if (res == ERL_DE_NO_ERROR) {
-	*function = fn;
-    }
-    return res;
-}
-
-int erts_sys_ddll_load_nif_init(void *handle, void **function, ErtsSysDdllError* err)
-{
-    void *fn;
-    int res;
-    if ((res = erts_sys_ddll_sym2(handle, "nif_init", &fn, err)) != ERL_DE_NO_ERROR) {
-	res = erts_sys_ddll_sym2(handle, "_nif_init", &fn, err);
-    }
-    if (res == ERL_DE_NO_ERROR) {
-	*function = fn;
-    }
-    return res;
-}
-
-/*
- * Call the driver_init function, whatever it's really called, simple on unix...
-*/
-void *erts_sys_ddll_call_init(void *function) {
-    void *(*initfn)(void) = function;
-    return (*initfn)();
-}
-void *erts_sys_ddll_call_nif_init(void *function) {
-    return erts_sys_ddll_call_init(function);
-}
-
-
-
-/*
- * Close a chared object
- */
-int erts_sys_ddll_close2(void *handle, ErtsSysDdllError* err)
-{
-   return ERL_DE_ERROR_NO_DDLL_FUNCTIONALITY;
-}
-
-
-/*
- * Return string that describes the (current) error
- */
-char *erts_sys_ddll_error(int code)
-{
-    return "Unspecified error";
-}
-
-void erts_sys_ddll_free_error(ErtsSysDdllError* err)
-{
-    if (err->str != NULL) {
-	erts_free(ERTS_ALC_T_DDLL_TMP_BUF, err->str);
-    }
-}
diff --git a/erts/emulator/sys/ose/erl_poll.c b/erts/emulator/sys/ose/erl_poll.c
deleted file mode 100644
index 5cee582a00..0000000000
--- a/erts/emulator/sys/ose/erl_poll.c
+++ /dev/null
@@ -1,818 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2006-2012. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-
-/*
- * Description:	Poll interface suitable for ERTS on OSE with or without
- *              SMP support.
- *
- *		The interface is currently implemented using:
- *                - receive + receive_fsem
- *
- * Author: 	Lukas Larsson
- */
-
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-
-#include "erl_thr_progress.h"
-#include "erl_driver.h"
-#include "erl_alloc.h"
-#include "erl_poll.h"
-
-#define NOFILE    4096
-
-/*
- * Some debug macros
- */
-
-/* #define HARDDEBUG
-#define HARDTRACE*/
-#ifdef HARDDEBUG
-#ifdef HARDTRACE
-#define HARDTRACEF(X, ...) { fprintf(stderr, X, __VA_ARGS__); fprintf(stderr,"\r\n"); }
-#else
-#define HARDTRACEF(...)
-#endif
-
-#else
-#define HARDTRACEF(X,...)
-#define HARDDEBUGF(...)
-#endif
-
-#if 0
-#define ERTS_POLL_DEBUG_PRINT
-#endif
-
-#if defined(DEBUG) && 0
-#define HARD_DEBUG
-#endif
-
-#  define SEL_ALLOC	erts_alloc
-#  define SEL_REALLOC	realloc_wrap
-#  define SEL_FREE	erts_free
-
-#ifdef ERTS_SMP
-
-#define ERTS_POLLSET_LOCK(PS) \
-  erts_smp_mtx_lock(&(PS)->mtx)
-#define ERTS_POLLSET_UNLOCK(PS) \
-  erts_smp_mtx_unlock(&(PS)->mtx)
-
-#else
-
-#define ERTS_POLLSET_LOCK(PS)
-#define ERTS_POLLSET_UNLOCK(PS)
-
-#endif
-
-/*
- * --- Data types ------------------------------------------------------------
- */
-
-union SIGNAL {
-    SIGSELECT sig_no;
-};
-
-typedef struct erts_sigsel_item_ ErtsSigSelItem;
-
-struct erts_sigsel_item_ {
-    ErtsSigSelItem *next;
-    ErtsSysFdType fd;
-    ErtsPollEvents events;
-};
-
-typedef struct erts_sigsel_info_ ErtsSigSelInfo;
-
-struct erts_sigsel_info_ {
-    ErtsSigSelInfo *next;
-    SIGSELECT signo;
-    ErlDrvOseEventId (*decode)(union SIGNAL* sig);
-    ErtsSigSelItem *fds;
-};
-
-struct ErtsPollSet_ {
-    SIGSELECT *sigs;
-    ErtsSigSelInfo *info;
-    Uint sig_count;
-    Uint item_count;
-    PROCESS interrupt;
-    erts_atomic32_t wakeup_state;
-    erts_atomic64_t timeout_time;
-#ifdef ERTS_SMP
-    erts_smp_mtx_t mtx;
-#endif
-};
-
-static int max_fds = -1;
-
-static ERTS_INLINE void
-init_timeout_time(ErtsPollSet ps)
-{
-    erts_atomic64_init_nob(&ps->timeout_time,
-			   (erts_aint64_t) ERTS_MONOTONIC_TIME_MAX);
-}
-
-static ERTS_INLINE void
-set_timeout_time(ErtsPollSet ps, ErtsMonotonicTime time)
-{
-    erts_atomic64_set_relb(&ps->timeout_time,
-			   (erts_aint64_t) time);
-}
-
-static ERTS_INLINE ErtsMonotonicTime
-get_timeout_time(ErtsPollSet ps)
-{
-    return (ErtsMonotonicTime) erts_atomic64_read_acqb(&ps->timeout_time);
-}
-
-#define ERTS_POLL_NOT_WOKEN		((erts_aint32_t) (1 << 0))
-#define ERTS_POLL_WOKEN_INTR		((erts_aint32_t) (1 << 1))
-#define ERTS_POLL_WOKEN_TIMEDOUT	((erts_aint32_t) (1 << 2))
-#define ERTS_POLL_WOKEN_IO_READY	((erts_aint32_t) (1 << 3))
-#define ERTS_POLL_SLEEPING	        ((erts_aint32_t) (1 << 4))
-
-/* signal list prototypes */
-static ErtsSigSelInfo *get_sigsel_info(ErtsPollSet ps, SIGSELECT signo);
-static ErtsSigSelItem *get_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd);
-static ErtsSigSelInfo *add_sigsel_info(ErtsPollSet ps, ErtsSysFdType fd,
-				       ErlDrvOseEventId (*decode)(union SIGNAL* sig));
-static ErtsSigSelItem *add_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd,
-				       ErlDrvOseEventId (*decode)(union SIGNAL* sig));
-static int del_sigsel_info(ErtsPollSet ps, ErtsSigSelInfo *info);
-static int del_sigsel_item(ErtsPollSet ps, ErtsSigSelItem *item);
-static int update_sigsel(ErtsPollSet ps);
-
-static ErtsSigSelInfo *
-get_sigsel_info(ErtsPollSet ps, SIGSELECT signo) {
-    ErtsSigSelInfo *curr = ps->info;
-    while (curr != NULL) {
-	if (curr->signo == signo)
-	    return curr;
-	curr = curr->next;
-    }
-    return NULL;
-}
-
-static ErtsSigSelItem *
-get_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd) {
-    ErtsSigSelInfo *info = get_sigsel_info(ps,fd->signo);
-    ErtsSigSelItem *curr;
-
-    if (info == NULL)
-	return NULL;
-
-    curr = info->fds;
-
-    while (curr != NULL) {
-	if (curr->fd->id == fd->id) {
-	    ASSERT(curr->fd->signo == fd->signo);
-	    return curr;
-	}
-	curr = curr->next;
-    }
-    return NULL;
-}
-
-static ErtsSigSelInfo *
-add_sigsel_info(ErtsPollSet ps, ErtsSysFdType fd,
-		ErlDrvOseEventId (*decode)(union SIGNAL* sig)) {
-    ErtsSigSelInfo *info = SEL_ALLOC(ERTS_ALC_T_POLLSET,
-		       sizeof(ErtsSigSelInfo));
-    info->next = ps->info;
-    info->fds = NULL;
-    info->signo = fd->signo;
-    info->decode = decode;
-    ps->info = info;
-    ps->sig_count++;
-    return info;
-}
-
-static ErtsSigSelItem *
-add_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd,
-		ErlDrvOseEventId (*decode)(union SIGNAL* sig)) {
-    ErtsSigSelInfo *info = get_sigsel_info(ps,fd->signo);
-    ErtsSigSelItem *item = SEL_ALLOC(ERTS_ALC_T_POLLSET,
-			   sizeof(ErtsSigSelItem));
-    if (info == NULL)
-	info = add_sigsel_info(ps, fd, decode);
-    if (info->decode != decode) {
-	erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
-	erts_dsprintf(dsbufp, "erts_poll_control() inconsistency: multiple resolve_signal functions for same signal (%d)\n",
-	    fd->signo);
-	erts_send_error_to_logger_nogl(dsbufp);
-    }
-    ASSERT(info->decode == decode);
-    item->next = info->fds;
-    item->fd = fd;
-    item->events = 0;
-    info->fds = item;
-    ps->item_count++;
-    return item;
-}
-
-static int del_sigsel_info(ErtsPollSet ps, ErtsSigSelInfo *info) {
-    ErtsSigSelInfo *curr, *prev;
-
-    if (ps->info == info) {
-	ps->info = ps->info->next;
-    } else {
-	curr = ps->info->next;
-	prev = ps->info;
-
-	while (curr != info) {
-	    if (curr == NULL)
-		return 1;
-	    prev = curr;
-	    curr = curr->next;
-	}
-	prev->next = curr->next;
-    }
-
-    ps->sig_count--;
-    SEL_FREE(ERTS_ALC_T_POLLSET, info);
-    return 0;
-}
-
-static int del_sigsel_item(ErtsPollSet ps, ErtsSigSelItem *item) {
-    ErtsSigSelInfo *info = get_sigsel_info(ps,item->fd->signo);
-    ErtsSigSelItem *curr, *prev;
-
-    ps->item_count--;
-    ASSERT(ps->item_count >= 0);
-
-    if (info->fds == item) {
-	info->fds = info->fds->next;
-	SEL_FREE(ERTS_ALC_T_POLLSET,item);
-	if (info->fds == NULL)
-	    return del_sigsel_info(ps,info);
-	return 0;
-    }
-
-    curr = info->fds->next;
-    prev = info->fds;
-
-    while (curr != item) {
-	if (curr == NULL) {
-	    /* We did not find an item to delete so we have to
-	     * increment item count again.
-	     */
-	    ps->item_count++;
-	    return 1;
-	}
-	prev = curr;
-	curr = curr->next;
-    }
-    prev->next = curr->next;
-    SEL_FREE(ERTS_ALC_T_POLLSET,item);
-    return 0;
-}
-
-#ifdef ERTS_SMP
-
-static void update_redir_tables(ErtsPollSet ps) {
-  struct OS_redir_entry *redir_table;
-  PROCESS sched_1 = ERTS_SCHEDULER_IX(0)->tid.id;
-  int i;
-  redir_table = SEL_ALLOC(ERTS_ALC_T_POLLSET,
-			  sizeof(struct OS_redir_entry)*(ps->sig_count+1));
-
-  redir_table[0].sig = ps->sig_count+1;
-  redir_table[0].pid = 0;
-
-  for (i = 1; i < ps->sig_count+1; i++) {
-    redir_table[i].sig = ps->sigs[i];
-    redir_table[i].pid = sched_1;
-  }
-
-  for (i = 1; i < erts_no_schedulers; i++) {
-    ErtsSchedulerData *esdp = ERTS_SCHEDULER_IX(i);
-    set_redirection(esdp->tid.id,redir_table);
-  }
-
-  SEL_FREE(ERTS_ALC_T_POLLSET,redir_table);
-}
-
-#endif
-
-static int update_sigsel(ErtsPollSet ps) {
-    ErtsSigSelInfo *info = ps->info;
-
-    int i;
-
-    if (ps->sigs != NULL)
-	SEL_FREE(ERTS_ALC_T_POLLSET,ps->sigs);
-
-    if (ps->sig_count == 0) {
-	/* If there are no signals we place a non-valid signal to make sure that
-	 * we do not trigger on a any unrelated signals which are sent to the
-	 * process.
-	 */
-	ps->sigs = SEL_ALLOC(ERTS_ALC_T_POLLSET,sizeof(SIGSELECT)*(2));
-	ps->sigs[0] = 1;
-	ps->sigs[1] = ERTS_SIGNAL_INVALID;
-	return 0;
-    }
-
-    ps->sigs = SEL_ALLOC(ERTS_ALC_T_POLLSET,sizeof(SIGSELECT)*(ps->sig_count+1));
-    ps->sigs[0] = ps->sig_count;
-
-    for (i = 1; info != NULL; i++, info = info->next)
-	ps->sigs[i] = info->signo;
-
-#ifdef ERTS_SMP
-    update_redir_tables(ps);
-#endif
-
-    return 0;
-}
-
-static ERTS_INLINE void
-wake_poller(ErtsPollSet ps)
-{
-  erts_aint32_t wakeup_state;
-
-  ERTS_THR_MEMORY_BARRIER;
-  wakeup_state = erts_atomic32_read_nob(&ps->wakeup_state);
-  while (wakeup_state != ERTS_POLL_WOKEN_IO_READY
-	 && wakeup_state != ERTS_POLL_WOKEN_INTR) {
-    erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state,
-						  ERTS_POLL_WOKEN_INTR,
-						  wakeup_state);
-    if (act == wakeup_state) {
-      wakeup_state = act;
-      break;
-    }
-    wakeup_state = act;
-  }
-  if (wakeup_state == ERTS_POLL_SLEEPING) {
-    /*
-     * Since we don't know the internals of signal_fsem() we issue
-     * a memory barrier as a safety precaution ensuring that
-     * the store we just made to wakeup_state wont be reordered
-     * with loads in signal_fsem().
-     */
-    ERTS_THR_MEMORY_BARRIER;
-    signal_fsem(ps->interrupt);
-  }
-}
-
-static ERTS_INLINE void
-reset_interrupt(ErtsPollSet ps)
-{
-    /* We need to keep io-ready if set */
-    erts_aint32_t wakeup_state = erts_atomic32_read_nob(&ps->wakeup_state);
-    while (wakeup_state != ERTS_POLL_NOT_WOKEN &&
-	   wakeup_state != ERTS_POLL_SLEEPING) {
-	erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state,
-						      ERTS_POLL_NOT_WOKEN,
-						      wakeup_state);
-	if (wakeup_state == act)
-	    break;
-	wakeup_state = act;
-    }
-    ERTS_THR_MEMORY_BARRIER;
-}
-
-static ERTS_INLINE void
-set_interrupt(ErtsPollSet ps)
-{
-    wake_poller(ps);
-}
-
-void erts_poll_interrupt(ErtsPollSet ps,int set) {
-    HARDTRACEF("erts_poll_interrupt called!\n");
-
-    if (!set)
-	reset_interrupt(ps);
-    else
-	set_interrupt(ps);
-
-}
-
-void erts_poll_interrupt_timed(ErtsPollSet ps,
-			       int set,
-			       ErtsTimeoutTime timeout_time) {
-    HARDTRACEF("erts_poll_interrupt_timed called!\n");
-
-    if (!set)
-	reset_interrupt(ps);
-    else if (get_timeout_time(ps) > timeout_time)
-        set_interrupt(ps);
-}
-
-ErtsPollEvents erts_poll_control(ErtsPollSet ps, ErtsSysFdType fd,
-	ErtsPollEvents pe, int on, int* do_wake) {
-    ErtsSigSelItem *curr;
-    ErtsPollEvents new_events;
-    int old_sig_count;
-
-    HARDTRACEF(
-	    "%ux: In erts_poll_control, fd = %d, pe = %d, on = %d, *do_wake = %d, curr = 0x%xu",
-	    ps, fd, pe, on, do_wake, curr);
-
-    ERTS_POLLSET_LOCK(ps);
-
-    if (on && (pe & ERTS_POLL_EV_IN) && (pe & ERTS_POLL_EV_OUT)) {
-      /* Check to make sure both in and out are not used at the same time */
-      new_events = ERTS_POLL_EV_NVAL;
-      goto done;
-    }
-
-    curr = get_sigsel_item(ps, fd);
-    old_sig_count = ps->sig_count;
-
-    if (curr == NULL && on) {
-	curr = add_sigsel_item(ps, fd, fd->resolve_signal);
-    } else if (curr == NULL && !on) {
-        new_events = ERTS_POLL_EV_NVAL;
-	goto done;
-    }
-
-    new_events = curr->events;
-
-    if (pe == 0) {
-	*do_wake = 0;
-	goto done;
-    }
-
-    if (on) {
-	new_events |= pe;
-	curr->events = new_events;
-    } else {
-	new_events &= ~pe;
-	curr->events = new_events;
-	if (new_events == 0 && del_sigsel_item(ps, curr)) {
-	    new_events = ERTS_POLL_EV_NVAL;
-	    goto done;
-	}
-    }
-
-    if (ps->sig_count != old_sig_count) {
-      if (update_sigsel(ps))
-	new_events = ERTS_POLL_EV_NVAL;
-    }
-done:
-    ERTS_POLLSET_UNLOCK(ps);
-    HARDTRACEF("%ux: Out erts_poll_control", ps);
-    return new_events;
-}
-
-int erts_poll_wait(ErtsPollSet ps,
-		   ErtsPollResFd pr[],
-		   int *len,
-		   ErtsMonotonicTime timeout_time)
-{
-    int res = ETIMEDOUT, no_fds, currid = 0;
-    OSTIME timeout;
-    union SIGNAL *sig;
-    ErtsMonotonicTime current_time, diff_time, timeout;
-    // HARDTRACEF("%ux: In erts_poll_wait",ps);
-    if (ps->interrupt == (PROCESS)0)
-      ps->interrupt = current_process();
-
-    ASSERT(current_process() == ps->interrupt);
-    ASSERT(get_fsem(current_process()) == 0);
-    ASSERT(erts_atomic32_read_nob(&ps->wakeup_state) &
-	   (ERTS_POLL_NOT_WOKEN | ERTS_POLL_WOKEN_INTR));
-    /* Max no of spots avable in pr */
-    no_fds = *len;
-
-    *len = 0;
-
-    /* erts_printf("Entering erts_poll_wait(), timeout_time=%bps\n",
-		   timeout_time); */
-
-    if (timeout_time == ERTS_POLL_NO_TIMEOUT) {
-    no_timeout:
-	timeout = (OSTIME) 0;
-	save_timeout_time = ERTS_MONOTONIC_TIME_MIN;
-    }
-    else {
-	ErtsMonotonicTime current_time, diff_time;
-	current_time = erts_get_monotonic_time(NULL);
-	diff_time = timeout_time - current_time;
-	if (diff_time <= 0)
-	    goto no_timeout;
-	diff_time = (ERTS_MONOTONIC_TO_MSEC(diff_time - 1) + 1);
-	if (diff_time > INT_MAX)
-	    diff_time = INT_MAX;
-	timeout = (OSTIME) diff_time;
-	save_timeout_time = current_time;
-	save_timeout_time += ERTS_MSEC_TO_MONOTONIC(diff_time);
-    }
-
-    set_timeout_time(ps, save_timeout_time);
-
-    while (currid < no_fds) {
-      if (timeout > 0) {
-	erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state,
-						      ERTS_POLL_SLEEPING,
-						      ERTS_POLL_NOT_WOKEN);
-	if (act == ERTS_POLL_NOT_WOKEN) {
-#ifdef ERTS_SMP
-	  erts_thr_progress_prepare_wait(NULL);
-#endif
-	  sig = receive_fsem(timeout, ps->sigs, 1);
-#ifdef ERTS_SMP
-	  erts_thr_progress_finalize_wait(NULL);
-#endif
-	} else {
-	  ASSERT(act == ERTS_POLL_WOKEN_INTR);
-	  sig = OS_RCV_FSEM;
-	}
-      } else
-	  sig = receive_w_tmo(0, ps->sigs);
-
-	if (sig == NULL) {
-	  if (timeout > 0) {
-	    erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state,
-							  ERTS_POLL_WOKEN_TIMEDOUT,
-							  ERTS_POLL_SLEEPING);
-	    if (act == ERTS_POLL_WOKEN_INTR)
-	      /* Restore fsem as it was signaled but we got a timeout */
-	      wait_fsem(1);
-	    } else
-	    erts_atomic32_cmpxchg_nob(&ps->wakeup_state,
-				      ERTS_POLL_WOKEN_TIMEDOUT,
-				      ERTS_POLL_NOT_WOKEN);
-	    break;
-	} else if (sig == OS_RCV_FSEM) {
-	  ASSERT(erts_atomic32_read_nob(&ps->wakeup_state) == ERTS_POLL_WOKEN_INTR);
-	  break;
-	}
-       {
-          ErtsSigSelInfo *info = get_sigsel_info(ps, sig->sig_no);
-          struct erts_sys_fd_type fd = { sig->sig_no, info->decode(sig) };
-          ErtsSigSelItem *item = get_sigsel_item(ps, &fd);
-
-	  ASSERT(sig);
-          if (currid == 0 && timeout > 0) {
-	    erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state,
-							  ERTS_POLL_WOKEN_IO_READY,
-							  ERTS_POLL_SLEEPING);
-	    if (act == ERTS_POLL_WOKEN_INTR) {
-	      /* Restore fsem as it was signaled but we got a msg */
-	      wait_fsem(1);
-	      act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state,
-					      ERTS_POLL_WOKEN_IO_READY,
-					      ERTS_POLL_WOKEN_INTR);
-	    }
-	  } else if (currid == 0) {
-	    erts_atomic32_set_nob(&ps->wakeup_state,
-				  ERTS_POLL_WOKEN_IO_READY);
-	  }
-
-	  if (item == NULL) {
-	    erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
-	    erts_dsprintf(
-                dsbufp,
-                "erts_poll_wait() failed: found unkown signal id %d (signo %u) "
-		"(curr_proc 0x%x)\n",
-                fd.id, fd.signo, current_process());
-             erts_send_error_to_logger_nogl(dsbufp);
-	     timeout = 0;
-             /* Under normal circumstances the signal is deallocated by the
-              * driver that issued the select operation. But in this case
-              * there's no driver waiting for such signal so we have to
-              * deallocate it here */
-             if (sig)
-                 free_buf(&sig);
-	  } else {
-	    int i;
-	    struct erts_sys_fd_type *fd = NULL;
-	    ErtsPollOseMsgList *tl,*new;
-
-	    /* Check if this fd has already been triggered by a previous signal */
-	    for (i = 0; i < currid;i++) {
-	      if (pr[i].fd == item->fd) {
-		fd = pr[i].fd;
-		pr[i].events |= item->events;
-		break;
-	      }
-	    }
-
-	    /* First time this fd is triggered */
-	    if (fd == NULL) {
-	      pr[currid].fd = item->fd;
-	      pr[currid].events = item->events;
-	      fd = item->fd;
-	      timeout = 0;
-	      currid++;
-	    }
-
-	    /* Insert new signal in approriate list */
-	    new = erts_alloc(ERTS_ALC_T_FD_SIG_LIST,sizeof(ErtsPollOseMsgList));
-	    new->next = NULL;
-	    new->data = sig;
-
-	    ethr_mutex_lock(&fd->mtx);
-	    tl = fd->msgs;
-
-	    if (tl == NULL) {
-	      fd->msgs = new;
-	    } else {
-	      while (tl->next != NULL)
-		tl = tl->next;
-	      tl->next = new;
-	    }
-	    ethr_mutex_unlock(&fd->mtx);
-          }
-
-       }
-    }
-
-    {
-       erts_aint32_t wakeup_state = erts_atomic32_read_nob(&ps->wakeup_state);
-
-       switch (wakeup_state) {
-          case ERTS_POLL_WOKEN_IO_READY:
-             res = 0;
-             break;
-          case ERTS_POLL_WOKEN_INTR:
-             res = EINTR;
-             break;
-          case ERTS_POLL_WOKEN_TIMEDOUT:
-             res = ETIMEDOUT;
-             break;
-          case ERTS_POLL_NOT_WOKEN:
-             /* This happens when we get an invalid signal only */
-             res = EINVAL;
-             break;
-          default:
-             res = 0;
-             erl_exit(ERTS_ABORT_EXIT,
-                      "%s:%d: Internal error: Invalid wakeup_state=%d\n",
-                      __FILE__, __LINE__, (int) wakeup_state);
-       }
-    }
-
-    erts_atomic32_set_nob(&ps->wakeup_state, ERTS_POLL_NOT_WOKEN);
-    set_timeout_time(ps, ERTS_MONOTONIC_TIME_MAX);
-
-    *len = currid;
-
-    // HARDTRACEF("%ux: Out erts_poll_wait",ps);
-    return res;
-}
-
-int erts_poll_max_fds(void)
-{
-
-    HARDTRACEF("In/Out erts_poll_max_fds -> %d",max_fds);
-    return max_fds;
-}
-
-void erts_poll_info(ErtsPollSet ps,
-		    ErtsPollInfo *pip)
-{
-    Uint size = 0;
-    Uint num_events = 0;
-
-    size += sizeof(struct ErtsPollSet_);
-    size += sizeof(ErtsSigSelInfo)*ps->sig_count;
-    size += sizeof(ErtsSigSelItem)*ps->item_count;
-    size += sizeof(SIGSELECT)*(ps->sig_count+1);
-
-    pip->primary = "receive_fsem";
-
-    pip->fallback = NULL;
-
-    pip->kernel_poll = NULL;
-
-    pip->memory_size = size;
-
-    pip->poll_set_size = num_events;
-
-    pip->fallback_poll_set_size = 0;
-
-    pip->lazy_updates = 0;
-
-    pip->pending_updates = 0;
-
-    pip->batch_updates = 0;
-
-    pip->concurrent_updates = 0;
-
-
-    pip->max_fds = erts_poll_max_fds();
-    HARDTRACEF("%ux: Out erts_poll_info",ps);
-
-}
-
-ErtsPollSet erts_poll_create_pollset(void)
-{
-    ErtsPollSet ps = SEL_ALLOC(ERTS_ALC_T_POLLSET,
-			       sizeof(struct ErtsPollSet_));
-
-    ps->sigs       = NULL;
-    ps->sig_count  = 0;
-    ps->item_count = 0;
-    ps->info       = NULL;
-    ps->interrupt  = (PROCESS)0;
-    erts_atomic32_init_nob(&ps->wakeup_state, ERTS_POLL_NOT_WOKEN);
-    init_timeout_time(ps);
-#ifdef ERTS_SMP
-    erts_smp_mtx_init(&ps->mtx, "pollset");
-#endif
-    update_sigsel(ps);
-    HARDTRACEF("%ux: Out erts_poll_create_pollset",ps);
-    return ps;
-}
-
-void erts_poll_destroy_pollset(ErtsPollSet ps)
-{
-    ErtsSigSelInfo *info;
-    for (info = ps->info; ps->info != NULL; info = ps->info, ps->info = ps->info->next) {
-	ErtsSigSelItem *item;
-	for (item = info->fds; info->fds != NULL; item = info->fds, info->fds = info->fds->next)
-	    SEL_FREE(ERTS_ALC_T_POLLSET, item);
-	SEL_FREE(ERTS_ALC_T_POLLSET, info);
-    }
-
-    SEL_FREE(ERTS_ALC_T_POLLSET,ps->sigs);
-
-#ifdef ERTS_SMP
-    erts_smp_mtx_destroy(&ps->mtx);
-#endif
-
-    SEL_FREE(ERTS_ALC_T_POLLSET,ps);
-}
-
-void  erts_poll_init(void)
-{
-    HARDTRACEF("In %s", __FUNCTION__);
-    max_fds = 256;
-
-    HARDTRACEF("Out %s", __FUNCTION__);
-}
-
-
-/* OSE driver functions */
-
-union SIGNAL *erl_drv_ose_get_signal(ErlDrvEvent drv_ev) {
-    struct erts_sys_fd_type *ev = (struct erts_sys_fd_type *)drv_ev;
-    ethr_mutex_lock(&ev->mtx);
-    if (ev->msgs == NULL) {
-      ethr_mutex_unlock(&ev->mtx);
-      return NULL;
-    } else {
-      ErtsPollOseMsgList *msg = ev->msgs;
-      union SIGNAL *sig = (union SIGNAL*)msg->data;
-      ASSERT(msg->data);
-      ev->msgs = msg->next;
-      ethr_mutex_unlock(&ev->mtx);
-      erts_free(ERTS_ALC_T_FD_SIG_LIST,msg);
-      restore(sig);
-      return sig;
-    }
-}
-
-ErlDrvEvent
-erl_drv_ose_event_alloc(SIGSELECT signo, ErlDrvOseEventId id,
-			ErlDrvOseEventId (*resolve_signal)(union SIGNAL *sig), void *extra) {
-  struct erts_sys_fd_type *ev = erts_alloc(ERTS_ALC_T_DRV_EV,
-					   sizeof(struct erts_sys_fd_type));
-  ev->signo = signo;
-  ev->extra = extra;
-  ev->id = id;
-  ev->msgs = NULL;
-  ev->resolve_signal = resolve_signal;
-  ethr_mutex_init(&ev->mtx);
-  return (ErlDrvEvent)ev;
-}
-
-void erl_drv_ose_event_free(ErlDrvEvent drv_ev) {
-  struct erts_sys_fd_type *ev = (struct erts_sys_fd_type *)drv_ev;
-  ASSERT(ev->msgs == NULL);
-  ethr_mutex_destroy(&ev->mtx);
-  erts_free(ERTS_ALC_T_DRV_EV,ev);
-}
-
-void erl_drv_ose_event_fetch(ErlDrvEvent drv_ev, SIGSELECT *signo,
-                             ErlDrvOseEventId *id, void **extra) {
-  struct erts_sys_fd_type *ev = (struct erts_sys_fd_type *)drv_ev;
-  if (signo)
-    *signo = ev->signo;
-  if (extra)
-    *extra = ev->extra;
-  if (id)
-    *id = ev->id;
-}
diff --git a/erts/emulator/sys/ose/erts.sig b/erts/emulator/sys/ose/erts.sig
deleted file mode 100644
index 78b883ee6c..0000000000
--- a/erts/emulator/sys/ose/erts.sig
+++ /dev/null
@@ -1,17 +0,0 @@
-#ifndef ERTS_OSE_SIGNALS
-#define ERTS_OSE_SIGNALS
-
-#ifndef ERTS_OSE_SIGNAL_BASE
-#define ERTS_OSE_SIGNAL_BASE 0x01900280
-#endif
-
-#define ERTS_SIGNAL_INVALID        ERTS_OSE_SIGNAL_BASE
-#define ERTS_SIGNAL_FD_DRV_CONFIG  ERTS_OSE_SIGNAL_BASE+1
-#define ERTS_SIGNAL_FD_DRV_ASYNC   ERTS_OSE_SIGNAL_BASE+2
-#define ERTS_SIGNAL_OSE_DRV_ATTACH ERTS_OSE_SIGNAL_BASE+3
-#define ERTS_SIGNAL_OSE_DRV_HUNT   ERTS_OSE_SIGNAL_BASE+4
-
-#define ERTS_SIGNAL_RUN_ERL_SETUP  ERTS_OSE_SIGNAL_BASE+100
-#define ERTS_SIGNAL_RUN_ERL_DAEMON ERTS_OSE_SIGNAL_BASE+101
-
-#endif
diff --git a/erts/emulator/sys/ose/gcc_4.4.3_lm_ppc.lcf b/erts/emulator/sys/ose/gcc_4.4.3_lm_ppc.lcf
deleted file mode 100644
index a19d23facf..0000000000
--- a/erts/emulator/sys/ose/gcc_4.4.3_lm_ppc.lcf
+++ /dev/null
@@ -1,182 +0,0 @@
-/*******************************************************************************
- * Copyright (C) 2013-2014 by Enea Software AB,
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- ******************************************************************************/
-
-OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
-OUTPUT_ARCH("powerpc")
-ENTRY("crt0_lm")
-MEMORY
-{
- rom : ORIGIN = 0x01000000, LENGTH = 0x01000000
- ram : ORIGIN = 0x02000000, LENGTH = 0x01000000
-}
-PHDRS
-{
-  ph_conf PT_LOAD ;
- ph_rom PT_LOAD ;
- ph_ram PT_LOAD ;
-}
-SECTIONS
-{
- .text :
- {
-  *(.text_first)
-  *(.text)
-  *(.text.*)
-  *(.stub)
-  *(oscode)
-  *(.init*)
-  *(.fini*)
-  *(.gnu.warning)
-  *(.gnu.linkonce.t.*)
-  *(.glue_7t)
-  *(.glue_7)
- } > rom :ph_rom = 0
- .ose_sfk_biosentry :
- {
-  *(.ose_sfk_biosentry)
-        } > rom :ph_rom
- .ctors :
- {
-  __CTOR_LIST__ = .;
-  *(.ctors)
-  *(SORT(.ctors.*))
-  __CTOR_END__ = .;
- } > rom :ph_rom
- .dtors :
- {
-  __DTOR_LIST__ = .;
-  *(.dtors)
-  *(SORT(.dtors.*))
-  __DTOR_END__ = .;
- } > rom :ph_rom
- OSESYMS :
- {
-  *(.osesyms)
- } > rom :ph_rom
- .rodata :
- {
-  *(.rodata)
-  *(.rodata.*)
-  *(.gnu.linkonce.r.*)
- } > rom :ph_rom
- .eh_frame_hdr :
- {
-  *(.eh_frame_hdr)
- } > rom :ph_rom
- .eh_frame :
- {
-  __EH_FRAME_BEGIN__ = .;
-  *(.eh_frame)
-  LONG(0)
-  __EH_FRAME_END__ = .;
- } > rom :ph_rom
- .gcc_except_table :
- {
-  *(.gcc_except_table .gcc_except_table.*)
- } > rom :ph_rom
- .sdata2 :
- {
-  PROVIDE (_SDA2_BASE_ = .);
-  *(.sdata2)
-  *(.sdata2.*)
-  *(.gnu.linkonce.s2.*)
- } > rom :ph_rom
- .sbss2 :
- {
-  *(.sbss2)
-  *(.sbss2.*)
-  *(.gnu.linkonce.sb2.*)
- } > rom :ph_rom
- LMCONF :
- {
-  obj/?*?/ose_confd.o(.rodata)
-  *(LMCONF)
- } > rom :ph_conf
- .data :
- {
-  LONG(0xDEADBABE)
-  *(.data)
-  *(.data.*)
-  *(.gnu.linkonce.d.*)
-  SORT(CONSTRUCTORS)
-  . = ALIGN(0x10);
- } > ram :ph_ram = 0
-        .sdata2 :
-   {
-         _SDA2_BASE_ = .;
-             *(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
-   }> ram :ph_ram
- .sdata :
- {
-         PROVIDE (_SDA_BASE_ = .);
-  *(.sdata)
-  *(.sdata.*)
-  *(.gnu.linkonce.s.*)
- } > ram :ph_ram
- .sbss :
- {
-  *(.sbss)
-  *(.sbss.*)
-  *(.scommon)
-  *(.gnu.linkonce.sb.*)
- } > ram :ph_ram
- .bss (NOLOAD) :
- {
-  *(.bss)
-  *(.bss.*)
-  *(COMMON)
-  *(.gnu.linkonce.b.*)
-  *(.osvars)
- } > ram :ph_ram
- .ignore (NOLOAD) :
- {
-  *(.rel.dyn)
- } > ram :ph_ram
- .debug 0 : { *(.debug) }
- .line 0 : { *(.line) }
- .debug_srcinfo 0 : { *(.debug_srcinfo) }
- .debug_sfnames 0 : { *(.debug_sfnames) }
- .debug_aranges 0 : { *(.debug_aranges) }
- .debug_pubnames 0 : { *(.debug_pubnames) }
- .debug_info 0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }
- .debug_abbrev 0 : { *(.debug_abbrev) }
- .debug_line 0 : { *(.debug_line) }
- .debug_frame 0 : { *(.debug_frame) }
- .debug_str 0 : { *(.debug_str) }
- .debug_loc 0 : { *(.debug_loc) }
- .debug_macinfo 0 : { *(.debug_macinfo) }
- .debug_weaknames 0 : { *(.debug_weaknames) }
- .debug_funcnames 0 : { *(.debug_funcnames) }
- .debug_typenames 0 : { *(.debug_typenames) }
- .debug_varnames 0 : { *(.debug_varnames) }
-}
-__OSESYMS_START = ADDR(OSESYMS);
-__OSESYMS_END = ADDR(OSESYMS) + SIZEOF(OSESYMS);
diff --git a/erts/emulator/sys/ose/gcc_4.6.3_lm_ppc.lcf b/erts/emulator/sys/ose/gcc_4.6.3_lm_ppc.lcf
deleted file mode 100644
index 3440c2961b..0000000000
--- a/erts/emulator/sys/ose/gcc_4.6.3_lm_ppc.lcf
+++ /dev/null
@@ -1,242 +0,0 @@
-/*******************************************************************************
- * Copyright (C) 2013-2014 by Enea Software AB,
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- ******************************************************************************/
-
-OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
-OUTPUT_ARCH("powerpc")
-
-ENTRY("crt0_lm")
-
-/* Note:
- * You may have to increase the length of the "rom" memory region and the
- * origin and length of the "ram" memory region below depending on the size
- * of the code and data in your load module.
- */
-
-MEMORY
-{
-	conf : ORIGIN = 0x00100000, LENGTH = 0x00030000
-	rom  : ORIGIN = 0x01000000, LENGTH = 0x01000000
-	ram  : ORIGIN = 0x03000000, LENGTH = 0x01000000
-}
-
-PHDRS
-{
-	ph_conf PT_LOAD ;
-	ph_rom PT_LOAD ;
-	ph_ram PT_LOAD ;
-}
-
-SECTIONS
-{
-/*---------------------------------------------------------------------------
- *		Load module configuration area
- *-------------------------------------------------------------------------*/
-
-	/* Load module configuration section. */
-	LMCONF :
-	{
-		obj/?*?/ose_confd.o(.rodata)
-		*(LMCONF)
-	} > conf :ph_conf
-
-/*---------------------------------------------------------------------------
- *		Read-only area
- *-------------------------------------------------------------------------*/
-
-	/* Code section. */
-	.text :
-	{
-		*(.text)
-		*(.text.*)
-		*(.stub)
-		*(oscode)
-		*(.init*)
-		*(.fini*)
-		*(.gnu.warning)
-		*(.gnu.linkonce.t.*)
-	} > rom :ph_rom = 0
-
-	/* OSE symbols section. */
-	OSESYMS :
-	{
-		*(.osesyms)
-	} > rom :ph_rom
-
-	/* Read-only data section. */
-	.rodata :
-	{
-		*(.rodata)
-		*(.rodata.*)
-		*(.gnu.linkonce.r.*)
-	} > rom :ph_rom
-
-	/* C++ exception handling section. */
-	.eh_frame :
-	{
-		__EH_FRAME_BEGIN__ = .;
-		*(.eh_frame)
-		LONG(0)
-		__EH_FRAME_END__ = .;
-	} > rom :ph_rom
-
-	/* C++ exception handling section. */
-	.gcc_except_table :
-	{
-		*(.gcc_except_table .gcc_except_table.*)
-	} > rom :ph_rom
-
-	/* PowerPC EABI initialized read-only data section. */
-	.sdata2 :
-	{
-		PROVIDE (_SDA2_BASE_ = .);
-		*(.sdata2)
-		*(.sdata2.*)
-		*(.gnu.linkonce.s2.*)
-	} > rom :ph_rom
-
-	/* PowerPC EABI uninitialized read-only data section. */
-	.sbss2 :
-	{
-		*(.sbss2)
-		*(.sbss2.*)
-		*(.gnu.linkonce.sb2.*)
-	} > rom :ph_rom
-
-/*---------------------------------------------------------------------------
- *		Read-write area
- *-------------------------------------------------------------------------*/
-
-	/*-------------------------------------------------------------------
-	 * Initialized data (copied by PM)
-	 *-----------------------------------------------------------------*/
-
-	/* Data section. */
-	.data :
-	{
-		*(.data)
-		*(.data.*)
-		*(.gnu.linkonce.d.*)
-		SORT(CONSTRUCTORS)
-	} > ram :ph_ram
-
-	/* C++ constructor section. */
-	.ctors :
-	{
-		__CTOR_LIST__ = .;
-		*(.ctors)
-		*(SORT(.ctors.*))
-		__CTOR_END__ = .;
-	} > ram :ph_ram
-
-	/* C++ destructor section. */
-	.dtors :
-	{
-		__DTOR_LIST__ = .;
-		*(.dtors)
-		*(SORT(.dtors.*))
-		__DTOR_END__ = .;
-	} > ram :ph_ram
-
-
-	/* Small data section. */
-	.sdata ALIGN(0x10) :
-	{
-		PROVIDE (_SDA_BASE_ = .);
-		*(.sdata)
-		*(.sdata.*)
-		*(.gnu.linkonce.s.*)
-	} > ram :ph_ram
-
-	/*-------------------------------------------------------------------
-	 * Uninitialized data (cleared by PM)
-	 *-----------------------------------------------------------------*/
-
-	/* Small bss section. */
-	.sbss :
-	{
-		*(.sbss)
-		*(.sbss.*)
-		*(.scommon)
-		*(.gnu.linkonce.sb.*)
-	} > ram :ph_ram
-
-	/* Bss section. */
-	.bss :
-	{
-		*(.bss)
-		*(.bss.*)
-		*(COMMON)
-		*(.gnu.linkonce.b.*)
-	} > ram :ph_ram
-
-/*---------------------------------------------------------------------------
- *		Debug information
- *-------------------------------------------------------------------------*/
-
-	/*
-	 * Stabs debug sections.
-	 */
-
-	.stab            0 : { *(.stab) }
-	.stabstr         0 : { *(.stabstr) }
-	.stab.excl       0 : { *(.stab.excl) }
-	.stab.exclstr    0 : { *(.stab.exclstr) }
-	.stab.index      0 : { *(.stab.index) }
-	.stab.indexstr   0 : { *(.stab.indexstr) }
-	.comment         0 : { *(.comment) }
-
-	/*
-	 * DWARF debug sections.
-	 */
-
-	/* DWARF 1 */
-	.debug           0 : { *(.debug) }
-	.line            0 : { *(.line) }
-	/* GNU DWARF 1 extensions */
-	.debug_srcinfo   0 : { *(.debug_srcinfo) }
-	.debug_sfnames   0 : { *(.debug_sfnames) }
-	/* DWARF 1.1 and DWARF 2 */
-	.debug_aranges   0 : { *(.debug_aranges) }
-	.debug_pubnames  0 : { *(.debug_pubnames) }
-	/* DWARF 2 */
-	.debug_info      0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }
-	.debug_abbrev    0 : { *(.debug_abbrev) }
-	.debug_line      0 : { *(.debug_line) }
-	.debug_frame     0 : { *(.debug_frame) }
-	.debug_str       0 : { *(.debug_str) }
-	.debug_loc       0 : { *(.debug_loc) }
-	.debug_macinfo   0 : { *(.debug_macinfo) }
-	/* SGI/MIPS DWARF 2 extensions */
-	.debug_weaknames 0 : { *(.debug_weaknames) }
-	.debug_funcnames 0 : { *(.debug_funcnames) }
-	.debug_typenames 0 : { *(.debug_typenames) }
-	.debug_varnames  0 : { *(.debug_varnames) }
-}
diff --git a/erts/emulator/sys/ose/sys.c b/erts/emulator/sys/ose/sys.c
deleted file mode 100644
index bcd0ffa0b6..0000000000
--- a/erts/emulator/sys/ose/sys.c
+++ /dev/null
@@ -1,1847 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 1996-2013. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-#include "sys/time.h"
-#include "time.h"
-#include "sys/uio.h"
-#include "termios.h"
-#include "ctype.h"
-#include "termios.h"
-
-#ifdef HAVE_FCNTL_H
-#include "fcntl.h"
-#endif
-
-#ifdef HAVE_SYS_IOCTL_H
-#include "sys/ioctl.h"
-#endif
-
-#define ERTS_WANT_BREAK_HANDLING
-#define WANT_NONBLOCKING
-#include "sys.h"
-#include "erl_thr_progress.h"
-
-#ifdef USE_THREADS
-#include "erl_threads.h"
-#endif
-
-#include "erl_mseg.h"
-
-#include "unistd.h"
-#include "efs.h"
-#include "erl_printf.h"
-#include "aio.h"
-#include "pm.h"
-#include "fcntl.h"
-
-/* Set the define to 1 to get some logging */
-#if 0
-#include "ramlog.h"
-#define LOG(output) ramlog_printf output
-#else
-#define LOG(output)
-#endif
-
-extern char **environ;
-static erts_smp_rwmtx_t environ_rwmtx;
-static PROCESS sig_proxy_pid = 0;
-
-#define MAX_VSIZE 16		/* Max number of entries allowed in an I/O
-				 * vector sock_sendv().
-				 */
-/*
- * Don't need global.h, but bif_table.h (included by bif.h),
- * won't compile otherwise
- */
-#include "global.h"
-#include "bif.h"
-
-#include "erl_sys_driver.h"
-#include "erl_check_io.h"
-#include "erl_cpu_topology.h"
-
-/* The priority for reader/writer processes */
-#define FD_PROC_PRI get_pri(current_process())
-
-typedef struct ErtsSysReportExit_ ErtsSysReportExit;
-struct ErtsSysReportExit_ {
-    ErtsSysReportExit  *next;
-    Eterm              port;
-    int                pid;
-    int                ifd;
-    int                ofd;
-    ErlDrvEvent        attach_event;
-    ErlDrvEvent        input_event;
-    ErlDrvEvent        output_event;
-};
-
-/* This data is shared by these drivers - initialized by spawn_init() */
-static struct driver_data {
-   ErlDrvPort          port_num;
-   int                 ofd;
-   int                 ifd;
-   int                 packet_bytes;
-   ErtsSysReportExit   *report_exit;
-   int                 pid;
-   int                 alive;
-   int                 status;
-   ErlDrvEvent         input_event;
-   ErlDrvEvent         output_event;
-   struct aiocb        aiocb;
-   FmHandle            handle;
-   char                *install_handle;
-} *driver_data;			/* indexed by fd */
-
-struct async {
-  SIGSELECT            signo;
-  ErlDrvTermData       port;
-  ErlDrvTermData       proc;
-  PROCESS              spid;
-  PROCESS              target;
-  Uint32               ref;
-};
-
-static ErtsSysReportExit *report_exit_list;
-static ERTS_INLINE void report_exit_status(ErtsSysReportExit *rep, int status);
-
-extern int  driver_interrupt(int, int);
-extern void do_break(void);
-
-extern void erl_sys_args(int*, char**);
-
-/* The following two defs should probably be moved somewhere else */
-
-extern void erts_sys_init_float(void);
-
-extern void erl_crash_dump(char* file, int line, char* fmt, ...);
-
-#define DIR_SEPARATOR_CHAR    '/'
-
-#if defined(DEBUG)
-#define ERL_BUILD_TYPE_MARKER ".debug"
-#else /* opt */
-#define ERL_BUILD_TYPE_MARKER
-#endif
-
-#define CHILD_SETUP_PROG_NAME	"child_setup" ERL_BUILD_TYPE_MARKER
-
-#ifdef DEBUG
-static int debug_log = 0;
-#endif
-
-#ifdef ERTS_SMP
-static erts_smp_atomic32_t have_prepared_crash_dump;
-#define ERTS_PREPARED_CRASH_DUMP \
-  ((int) erts_smp_atomic32_xchg_nob(&have_prepared_crash_dump, 1))
-#else
-static volatile int have_prepared_crash_dump;
-#define ERTS_PREPARED_CRASH_DUMP \
-  (have_prepared_crash_dump++)
-#endif
-
-static erts_smp_atomic_t sys_misc_mem_sz;
-
-#if defined(ERTS_SMP)
-erts_mtx_t chld_stat_mtx;
-#endif
-
-#if defined(ERTS_SMP) /* ------------------------------------------------- */
-#define CHLD_STAT_LOCK		erts_mtx_lock(&chld_stat_mtx)
-#define CHLD_STAT_UNLOCK	erts_mtx_unlock(&chld_stat_mtx)
-
-#else /* ------------------------------------------------------------------- */
-#define CHLD_STAT_LOCK
-#define CHLD_STAT_UNLOCK
-static volatile int children_died;
-#endif
-
-#define SET_AIO(REQ,FD,SIZE,BUFF)                                       \
-   memset(&(REQ),0,sizeof(REQ));                                        \
-   (REQ).aio_fildes = FD;                                               \
-   (REQ).aio_offset = FM_POSITION_CURRENT;                              \
-   (REQ).aio_nbytes = SIZE;                                             \
-   (REQ).aio_buf = BUFF;                                                \
-   (REQ).aio_sigevent.sigev_notify = SIGEV_NONE
-
-/* the first sizeof(struct aiocb *) bytes of the write buffer
- * will contain the pointer to the aiocb struct, this needs
- * to be freed between asynchronous writes.
- * A write of 0 bytes is ignored. */
-#define WRITE_AIO(FD,SIZE,BUFF) do {                                    \
-   if (SIZE > 0) {                                                      \
-      struct aiocb *write_req = driver_alloc(sizeof(struct aiocb));     \
-      char *write_buff = driver_alloc((sizeof(char)*SIZE)+1+            \
-            (sizeof(struct aiocb *)));                                  \
-      *(struct aiocb **)write_buff = (struct aiocb *)write_req;         \
-      write_buff += sizeof(struct aiocb *);                             \
-      memcpy(write_buff,BUFF,SIZE+1);                                   \
-      SET_AIO(*write_req,FD,SIZE,write_buff);                           \
-      if (aio_write(write_req))						\
-	ramlog_printf("%s:%d: write failed with %d\n",			\
-		      __FILE__,__LINE__,errno);				\
-   }                                                                    \
-} while(0)
-
-/* free the write_buffer and write_req
- * created in the WRITE_AIO() request macro */
-#define FREE_AIO(ptr) do {                                              \
-   struct aiocb *aiocb_ptr;                                             \
-   char *buffer_ptr;                                                    \
-   aiocb_ptr = *(struct aiocb **)((ptr)-sizeof(struct aiocb *));        \
-   buffer_ptr = (((char*)ptr)-sizeof(struct aiocb *));			\
-   driver_free(aiocb_ptr);                                              \
-   driver_free(buffer_ptr);                                             \
-} while(0)
-
-#define DISPATCH_AIO(sig) do {                                          \
-   if (aio_dispatch(sig))						\
-     ramlog_printf("%s:%d: dispatch failed with %d\n",			\
-		   __FILE__,__LINE__,errno);				\
-   } while(0)
-
-#define AIO_PIPE_SIZE 1024
-
-/* debug print macros */
-#define DEBUG_RES 0
-
-#ifdef DEBUG_RES
-#define DEBUG_CHECK_RES(actual, expected) \
-   do { \
-      if (actual != expected ) { \
-         ramlog_printf("Result check failed" \
-                       " got: 0x%08x expected:0x%08x\nat: %s:%d\n", \
-               actual, expected, __FILE__, __LINE__); \
-         abort();  /* This might perhaps be too harsh? */ \
-      } \
-   } while(0)
-#else
-#define DEBUG_CHECK_RES
-#endif
-
-static struct fd_data {
-    char  pbuf[4];   /* hold partial packet bytes */
-    int   psz;       /* size of pbuf */
-    char  *buf;
-    char  *cpos;
-    int   sz;
-    int   remain;  /* for input on fd */
-} *fd_data;			/* indexed by fd */
-
-/********************* General functions ****************************/
-
-/* This is used by both the drivers and general I/O, must be set early */
-static int max_files = -1;
-
-/*
- * a few variables used by the break handler
- */
-#ifdef ERTS_SMP
-erts_smp_atomic32_t erts_break_requested;
-#define ERTS_SET_BREAK_REQUESTED \
-  erts_smp_atomic32_set_nob(&erts_break_requested, (erts_aint32_t) 1)
-#define ERTS_UNSET_BREAK_REQUESTED \
-  erts_smp_atomic32_set_nob(&erts_break_requested, (erts_aint32_t) 0)
-#else
-volatile int erts_break_requested = 0;
-#define ERTS_SET_BREAK_REQUESTED (erts_break_requested = 1)
-#define ERTS_UNSET_BREAK_REQUESTED (erts_break_requested = 0)
-#endif
-/* set early so the break handler has access to initial mode */
-static struct termios initial_tty_mode;
-static int replace_intr = 0;
-/* assume yes initially, ttsl_init will clear it */
-int using_oldshell = 1;
-static PROCESS get_signal_proxy_pid(void);
-
-static void
-init_check_io(void)
-{
-    erts_init_check_io();
-    max_files = erts_check_io_max_files();
-}
-
-#ifdef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
-#define ERTS_CHK_IO_AS_INTR()	erts_check_io_async_sig_interrupt()
-#else
-#define ERTS_CHK_IO_AS_INTR()	erts_check_io_interrupt(1)
-#endif
-#define ERTS_CHK_IO_INTR	erts_check_io_interrupt
-#define ERTS_CHK_IO_INTR_TMD	erts_check_io_interrupt_timed
-#define ERTS_CHK_IO		erts_check_io
-#define ERTS_CHK_IO_SZ		erts_check_io_size
-
-
-void
-erts_sys_schedule_interrupt(int set)
-{
-    ERTS_CHK_IO_INTR(set);
-}
-
-#ifdef ERTS_SMP
-void
-erts_sys_schedule_interrupt_timed(int set, ErtsMonotonicTime timeout_time)
-{
-    ERTS_CHK_IO_INTR_TMD(set, timeout_time);
-}
-#endif
-
-Uint
-erts_sys_misc_mem_sz(void)
-{
-    Uint res = ERTS_CHK_IO_SZ();
-    res += erts_smp_atomic_read_mb(&sys_misc_mem_sz);
-    return res;
-}
-
-/*
- * reset the terminal to the original settings on exit
- */
-void sys_tty_reset(int exit_code)
-{
-  if (using_oldshell && !replace_intr) {
-    SET_BLOCKING(0);
-  }
-  else if (isatty(0)) {
-    tcsetattr(0,TCSANOW,&initial_tty_mode);
-  }
-}
-
-#ifdef USE_THREADS
-
-typedef struct {
-    int sched_bind_data;
-} erts_thr_create_data_t;
-
-/*
- * thr_create_prepare() is called in parent thread before thread creation.
- * Returned value is passed as argument to thr_create_cleanup().
- */
-static void *
-thr_create_prepare(void)
-{
-    erts_thr_create_data_t *tcdp;
-
-    tcdp = erts_alloc(ERTS_ALC_T_TMP, sizeof(erts_thr_create_data_t));
-
-    tcdp->sched_bind_data = erts_sched_bind_atthrcreate_prepare();
-
-    return (void *) tcdp;
-}
-
-
-/* thr_create_cleanup() is called in parent thread after thread creation. */
-static void
-thr_create_cleanup(void *vtcdp)
-{
-    erts_thr_create_data_t *tcdp = (erts_thr_create_data_t *) vtcdp;
-
-    erts_sched_bind_atthrcreate_parent(tcdp->sched_bind_data);
-
-    erts_free(ERTS_ALC_T_TMP, tcdp);
-}
-
-static void
-thr_create_prepare_child(void *vtcdp)
-{
-    erts_thr_create_data_t *tcdp = (erts_thr_create_data_t *) vtcdp;
-
-#ifdef ERTS_ENABLE_LOCK_COUNT
-    erts_lcnt_thread_setup();
-#endif
-
-    erts_sched_bind_atthrcreate_child(tcdp->sched_bind_data);
-}
-
-#endif /* #ifdef USE_THREADS */
-
-/* The two functions below are stolen from win_con.c
-   They have to use malloc/free/realloc directly becasue
-   we want to do able to do erts_printf very early on.
- */
-#define VPRINTF_BUF_INC_SIZE 128
-static erts_dsprintf_buf_t *
-grow_vprintf_buf(erts_dsprintf_buf_t *dsbufp, size_t need)
-{
-    char *buf;
-    size_t size;
-
-    ASSERT(dsbufp);
-
-    if (!dsbufp->str) {
-	size = (((need + VPRINTF_BUF_INC_SIZE - 1)
-		 / VPRINTF_BUF_INC_SIZE)
-		* VPRINTF_BUF_INC_SIZE);
-	buf = (char *) malloc(size * sizeof(char));
-    }
-    else {
-	size_t free_size = dsbufp->size - dsbufp->str_len;
-
-	if (need <= free_size)
-	    return dsbufp;
-
-	size = need - free_size + VPRINTF_BUF_INC_SIZE;
-	size = (((size + VPRINTF_BUF_INC_SIZE - 1)
-		 / VPRINTF_BUF_INC_SIZE)
-		* VPRINTF_BUF_INC_SIZE);
-	size += dsbufp->size;
-        buf = (char *) realloc((void *) dsbufp->str,
-			       size * sizeof(char));
-    }
-    if (!buf)
-	return NULL;
-    if (buf != dsbufp->str)
-	dsbufp->str = buf;
-    dsbufp->size = size;
-    return dsbufp;
-}
-
-static int erts_sys_ramlog_printf(char *format, va_list arg_list)
-{
-    int res,i;
-    erts_dsprintf_buf_t dsbuf = ERTS_DSPRINTF_BUF_INITER(grow_vprintf_buf);
-    res = erts_vdsprintf(&dsbuf, format, arg_list);
-    if (res >= 0) {
-      for (i = 0; i < dsbuf.str_len; i+= 50)
-	/* We print 50 characters at a time because otherwise
-	   the ramlog looks broken */
-        ramlog_printf("%.*s",dsbuf.str_len-50 < 0?dsbuf.str_len:50,dsbuf.str+i);
-    }
-    if (dsbuf.str)
-      free((void *) dsbuf.str);
-    return res;
-}
-
-void
-erts_sys_pre_init(void)
-{
-    erts_printf_add_cr_to_stdout = 1;
-    erts_printf_add_cr_to_stderr = 1;
-#ifdef USE_THREADS
-    {
-    erts_thr_init_data_t eid = ERTS_THR_INIT_DATA_DEF_INITER;
-
-    eid.thread_create_child_func = thr_create_prepare_child;
-    /* Before creation in parent */
-    eid.thread_create_prepare_func = thr_create_prepare;
-    /* After creation in parent */
-    eid.thread_create_parent_func = thr_create_cleanup,
-
-    erts_thr_init(&eid);
-
-    report_exit_list = NULL;
-
-#ifdef ERTS_ENABLE_LOCK_COUNT
-    erts_lcnt_init();
-#endif
-
-#if defined(ERTS_SMP)
-    erts_mtx_init(&chld_stat_mtx, "child_status");
-#endif
-    }
-#ifdef ERTS_SMP
-    erts_smp_atomic32_init_nob(&erts_break_requested, 0);
-    erts_smp_atomic32_init_nob(&have_prepared_crash_dump, 0);
-#else
-    erts_break_requested = 0;
-    have_prepared_crash_dump = 0;
-#endif
-#if !defined(ERTS_SMP)
-    children_died = 0;
-#endif
-#endif /* USE_THREADS */
-
-    erts_printf_stdout_func = erts_sys_ramlog_printf;
-
-    erts_smp_atomic_init_nob(&sys_misc_mem_sz, 0);
-}
-
-void
-erl_sys_init(void)
-{
-
-#ifdef USE_SETLINEBUF
-    setlinebuf(stdout);
-#else
-    setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);
-#endif
-
-    erts_sys_init_float();
-
-    /* we save this so the break handler can set and reset it properly */
-    /* also so that we can reset on exit (break handler or not) */
-    if (isatty(0)) {
-	tcgetattr(0,&initial_tty_mode);
-    }
-    tzset(); /* Required at least for NetBSD with localtime_r() */
-}
-
-static ERTS_INLINE int
-prepare_crash_dump(int secs)
-{
-#define NUFBUF (3)
-    int i, max;
-    char env[21]; /* enough to hold any 64-bit integer */
-    size_t envsz;
-    /*DeclareTmpHeapNoproc(heap,NUFBUF);*/
-    /*Eterm *hp = heap;*/
-    /*Eterm list = NIL;*/
-    int has_heart = 0;
-
-    UseTmpHeapNoproc(NUFBUF);
-
-    if (ERTS_PREPARED_CRASH_DUMP)
-	return 0; /* We have already been called */
-
-
-    /* Positive secs means an alarm must be set
-     * 0 or negative means no alarm
-     *
-     * Set alarm before we try to write to a port
-     * we don't want to hang on a port write with
-     * no alarm.
-     *
-     */
-
-#if 0 /*ose TBD!!!*/
-    if (secs >= 0) {
-	alarm((unsigned int)secs);
-    }
-#endif
-
-    /* Make sure we unregister at epmd (unknown fd) and get at least
-       one free filedescriptor (for erl_crash.dump) */
-
-    max = max_files;
-    if (max < 1024)
-	max = 1024;
-    for (i = 3; i < max; i++) {
-	close(i);
-    }
-
-    envsz = sizeof(env);
-    i = erts_sys_getenv__("ERL_CRASH_DUMP_NICE", env, &envsz);
-    if (i >= 0) {
-	int nice_val;
-	nice_val = i != 0 ? 0 : atoi(env);
-	if (nice_val > 39) {
-	    nice_val = 39;
-	}
-	set_pri(nice_val);
-    }
-
-    UnUseTmpHeapNoproc(NUFBUF);
-#undef NUFBUF
-    return has_heart;
-}
-
-int erts_sys_prepare_crash_dump(int secs)
-{
-    return prepare_crash_dump(secs);
-}
-
-static ERTS_INLINE void
-break_requested(void)
-{
-  /*
-   * just set a flag - checked for and handled by
-   * scheduler threads erts_check_io() (not signal handler).
-   */
-#ifdef DEBUG
-  fprintf(stderr,"break!\n");
-#endif
-  if (ERTS_BREAK_REQUESTED)
-      erl_exit(ERTS_INTR_EXIT, "");
-
-  ERTS_SET_BREAK_REQUESTED;
-  ERTS_CHK_IO_AS_INTR(); /* Make sure we don't sleep in poll */
-}
-
-/* Disable break */
-void erts_set_ignore_break(void) {
-
-}
-
-/* Don't use ctrl-c for break handler but let it be
-   used by the shell instead (see user_drv.erl) */
-void erts_replace_intr(void) {
-  struct termios mode;
-
-  if (isatty(0)) {
-    tcgetattr(0, &mode);
-
-    /* here's an example of how to replace ctrl-c with ctrl-u */
-    /* mode.c_cc[VKILL] = 0;
-       mode.c_cc[VINTR] = CKILL; */
-
-    mode.c_cc[VINTR] = 0;	/* disable ctrl-c */
-    tcsetattr(0, TCSANOW, &mode);
-    replace_intr = 1;
-  }
-}
-
-void init_break_handler(void)
-{
-
-}
-
-int sys_max_files(void)
-{
-   return(max_files);
-}
-
-
-/************************** OS info *******************************/
-
-/* Used by erlang:info/1. */
-/* (This code was formerly in drv.XXX/XXX_os_drv.c) */
-
-char os_type[] = "ose";
-
-void
-os_flavor(char* namebuf,	/* Where to return the name. */
-	  unsigned size)	/* Size of name buffer. */
-{
-#if 0
-    struct utsname uts;		/* Information about the system. */
-    char* s;
-
-    (void) uname(&uts);
-    for (s = uts.sysname; *s; s++) {
-	if (isupper((int) *s)) {
-	    *s = tolower((int) *s);
-	}
-    }
-    strcpy(namebuf, uts.sysname);
-#else
-    strncpy(namebuf, "release", size);
-#endif
-}
-
-void
-os_version(pMajor, pMinor, pBuild)
-int* pMajor;			/* Pointer to major version. */
-int* pMinor;			/* Pointer to minor version. */
-int* pBuild;			/* Pointer to build number. */
-{
-    *pMajor = 5;
-    *pMinor = 7;
-    *pBuild = 0;
-}
-
-void init_getenv_state(GETENV_STATE *state)
-{
-   erts_smp_rwmtx_rlock(&environ_rwmtx);
-   *state = NULL;
-}
-
-char **environ; /*ose - needs replacement*/
-
-char *getenv_string(GETENV_STATE *state0)
-{
-   char **state = (char **) *state0;
-   char *cp;
-
-   ERTS_SMP_LC_ASSERT(erts_smp_lc_rwmtx_is_rlocked(&environ_rwmtx));
-
-   if (state == NULL)
-      state = environ;
-
-   cp = *state++;
-   *state0 = (GETENV_STATE) state;
-
-   return cp;
-}
-
-void fini_getenv_state(GETENV_STATE *state)
-{
-   *state = NULL;
-   erts_smp_rwmtx_runlock(&environ_rwmtx);
-}
-
-
-/************************** Port I/O *******************************/
-
-/* I. Common stuff */
-
-union SIGNAL {
-    SIGSELECT sig_no;
-    struct FmReadPtr fm_read_reply;
-    struct FmWritePtr fm_write_reply;
-    struct async async;
-};
-
-/* II. The spawn/fd drivers */
-
-/*
- * Decreasing the size of it below 16384 is not allowed.
- */
-#define ERTS_SYS_READ_BUF_SZ (64*1024)
-
-/* Driver interfaces */
-static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
-static ErlDrvData fd_start(ErlDrvPort, char*, SysDriverOpts*);
-static ErlDrvSSizeT fd_control(ErlDrvData, unsigned int, char *, ErlDrvSizeT,
-			       char **, ErlDrvSizeT);
-static int spawn_init(void);
-static void fd_stop(ErlDrvData);
-static void erl_stop(ErlDrvData);
-static void ready_input(ErlDrvData, ErlDrvEvent);
-static void ready_output(ErlDrvData, ErlDrvEvent);
-static void output(ErlDrvData, char*, ErlDrvSizeT);
-static void stop_select(ErlDrvEvent, void*);
-
-static PROCESS
-get_signal_proxy_pid(void) {
-   union SIGNAL *sig;
-   SIGSELECT any_sig[] = {1,ERTS_SIGNAL_OSE_DRV_ATTACH};
-
-   if (!sig_proxy_pid) {
-      sig = alloc(sizeof(union SIGNAL), ERTS_SIGNAL_OSE_DRV_ATTACH);
-      hunt("ose_signal_driver_proxy", 0, NULL, &sig);
-      sig = receive(any_sig);
-      sig_proxy_pid = sender(&sig);
-      free_buf(&sig);
-   }
-   ASSERT(sig_proxy_pid);
-   return sig_proxy_pid;
-}
-
-static ErlDrvOseEventId
-resolve_signal(union SIGNAL* sig) {
-   switch(sig->sig_no) {
-
-      case FM_READ_PTR_REPLY:
-            return (ErlDrvOseEventId)sig->fm_read_reply.handle;
-
-       case FM_WRITE_PTR_REPLY:
-            return (ErlDrvOseEventId)sig->fm_write_reply.handle;
-
-       case ERTS_SIGNAL_OSE_DRV_ATTACH:
-            return (ErlDrvOseEventId)sig->async.target;
-
-       default:
-            break;
-    }
-    return (ErlDrvOseEventId)-1;
-}
-
-struct erl_drv_entry spawn_driver_entry = {
-    spawn_init,
-    spawn_start,
-    NULL, /* erl_stop, */
-    output,
-    ready_input,
-    ready_output,
-    "spawn",
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    ERL_DRV_EXTENDED_MARKER,
-    ERL_DRV_EXTENDED_MAJOR_VERSION,
-    ERL_DRV_EXTENDED_MINOR_VERSION,
-    ERL_DRV_FLAG_USE_PORT_LOCKING,
-    NULL, NULL,
-    stop_select
-};
-struct erl_drv_entry fd_driver_entry = {
-    NULL,
-    fd_start,
-    fd_stop,
-    output,
-    ready_input,
-    ready_output,
-    "fd",
-    NULL,
-    NULL,
-    fd_control,
-    NULL,
-    NULL,
-    NULL, /* ready_async */
-    NULL, /* flush */
-    NULL, /* call */
-    NULL, /* event */
-    ERL_DRV_EXTENDED_MARKER,
-    ERL_DRV_EXTENDED_MAJOR_VERSION,
-    ERL_DRV_EXTENDED_MINOR_VERSION,
-    0, /* ERL_DRV_FLAGs */
-    NULL, /* handle2 */
-    NULL, /* process_exit */
-    stop_select
-};
-
-static void
-set_spawn_fd(int local_fd, int remote_fd, PROCESS remote_pid) {
-   PROCESS vm_pid;
-   FmHandle handle;
-   char env_val[55];
-   char env_name[10];
-   EfsStatus efs_res;
-
-   /* get pid of pipevm and handle of chosen fd */
-   efs_res = efs_examine_fd(local_fd, FLIB_FD_VMPID, &vm_pid, 0);
-   DEBUG_CHECK_RES(efs_res, EFS_SUCCESS);
-
-   /* setup the file descriptor to buffer per line */
-   efs_res = efs_config_fd(local_fd, FLIB_FD_BUFMODE, FM_BUFF_LINE,
-                    FLIB_FD_BUFSIZE, 80, 0);
-   DEBUG_CHECK_RES(efs_res, EFS_SUCCESS);
-
-   /* duplicate handle  and set spawn pid owner */
-   efs_res = efs_dup_to(local_fd, remote_pid, &handle);
-   DEBUG_CHECK_RES(efs_res, EFS_SUCCESS);
-
-   sprintf(env_name, "FD%d", remote_fd);
-
-   /* Syntax of the environment variable:
-    * "FD#" "<pid of pipevm>,<handle>,<buffer mode>,<buff size>,<omode>" */
-   sprintf(env_val, "0x%lx,0x%lx,%lu,%lu,0x%x",
-                    vm_pid, handle,
-                    FM_BUFF_LINE, 80,
-                    O_APPEND);
-
-   set_env(remote_pid, env_name, env_val);
-}
-
-static ErlDrvData
-set_driver_data(ErlDrvPort port_num,
-			   int ifd,
-			   int ofd,
-			   int packet_bytes,
-			   int read_write,
-			   int exit_status,
-			   PROCESS pid)
-{
-    Port *prt;
-    ErtsSysReportExit *report_exit;
-
-    prt = erts_drvport2port(port_num);
-    if (prt != ERTS_INVALID_ERL_DRV_PORT) {
-       prt->os_pid = pid;
-    }
-
-    /* READ */
-    if (read_write & DO_READ) {
-       EfsStatus res = efs_examine_fd(ifd, FLIB_FD_HANDLE,
-				      &driver_data[ifd].handle, 0);
-       if (res != EFS_SUCCESS)
-	 ramlog_printf("%s:%d: efs_examine_fd(%d) failed with %d\n",
-		       __FILE__,__LINE__,ifd,errno);
-       driver_data[ifd].ifd = ifd;
-       driver_data[ifd].packet_bytes = packet_bytes;
-       driver_data[ifd].port_num = port_num;
-       driver_data[ifd].pid = pid;
-
-       /* async read struct */
-       memset(&driver_data[ifd].aiocb, 0, sizeof(struct aiocb));
-       driver_data[ifd].aiocb.aio_buf = driver_alloc(AIO_PIPE_SIZE);
-       driver_data[ifd].aiocb.aio_fildes = ifd;
-       driver_data[ifd].aiocb.aio_nbytes = (packet_bytes?packet_bytes:AIO_PIPE_SIZE);
-       driver_data[ifd].alive = 1;
-       driver_data[ifd].status = 0;
-       driver_data[ifd].input_event =
-          erl_drv_ose_event_alloc(FM_READ_PTR_REPLY,
-                driver_data[ifd].handle, resolve_signal,
-                &driver_data[ifd].ifd);
-
-       /* READ & WRITE */
-       if (read_write & DO_WRITE) {
-          driver_data[ifd].ofd = ofd;
-          efs_examine_fd(ofd, FLIB_FD_HANDLE, &driver_data[ofd].handle, 0);
-
-          driver_data[ifd].output_event =
-             erl_drv_ose_event_alloc(FM_WRITE_PTR_REPLY,
-                   driver_data[ofd].handle, resolve_signal,
-                   &driver_data[ofd].ofd);
-          driver_data[ofd].pid = pid;
-          if (ifd != ofd) {
-             driver_data[ofd] = driver_data[ifd];
-             driver_data[ofd].aiocb.aio_buf = NULL;
-           }
-       }
-       else { /* READ ONLY */
-          driver_data[ifd].ofd = -1;
-       }
-
-       /* enable input event */
-       (void) driver_select(port_num, driver_data[ifd].input_event,
-			     (ERL_DRV_READ | ERL_DRV_USE), 1);
-
-       if (aio_read(&driver_data[ifd].aiocb))
-	 ramlog_printf("%s:%d: aio_read(%d) failed with %d\n",
-		       __FILE__,__LINE__,ifd,errno);
-    }
-    else { /* WRITE ONLY */
-       efs_examine_fd(ofd, FLIB_FD_HANDLE, &driver_data[ofd].handle, 0);
-       driver_data[ofd].packet_bytes = packet_bytes;
-       driver_data[ofd].port_num = port_num;
-       driver_data[ofd].ofd = ofd;
-       driver_data[ofd].pid = pid;
-       driver_data[ofd].alive = 1;
-       driver_data[ofd].status = 0;
-       driver_data[ofd].output_event =
-          erl_drv_ose_event_alloc(FM_WRITE_PTR_REPLY, driver_data[ofd].handle,
-				    resolve_signal, &driver_data[ofd].ofd);
-       driver_data[ofd].input_event = driver_data[ofd].output_event;
-    }
-
-    /* this is used for spawned load modules, and is needed
-     * to properly uninstall them */
-    if (exit_status) {
-       struct PmProgramInfo *info;
-       int install_handle_size;
-       union SIGNAL *sig;
-       PmStatus pm_status;
-       report_exit = erts_alloc(ERTS_ALC_T_PRT_REP_EXIT,
-				 sizeof(ErtsSysReportExit));
-       report_exit->next = report_exit_list;
-       report_exit->port = erts_drvport2id(port_num);
-       report_exit->pid = pid;
-       report_exit->ifd = (read_write & DO_READ) ? ifd : -1;
-       report_exit->ofd = (read_write & DO_WRITE) ? ofd : -1;
-       report_exit_list = report_exit;
-       report_exit->attach_event =
-          erl_drv_ose_event_alloc(ERTS_SIGNAL_OSE_DRV_ATTACH, pid,
-				resolve_signal, &driver_data[ifd].ifd);
-
-       /* setup ifd and ofd report exit */
-       driver_data[ifd].report_exit = report_exit;
-       driver_data[ofd].report_exit = report_exit;
-
-       pm_status = ose_pm_program_info(pid, &info);
-       DEBUG_CHECK_RES(pm_status, PM_SUCCESS);
-
-       install_handle_size = strlen(info->install_handle)+1;
-       driver_data[ifd].install_handle = driver_alloc(install_handle_size);
-       strcpy(driver_data[ifd].install_handle,
-             info->install_handle);
-
-       free_buf((union SIGNAL **)&info);
-
-       sig = alloc(sizeof(struct async), ERTS_SIGNAL_OSE_DRV_ATTACH);
-       sig->async.target = pid;
-       send(&sig, get_signal_proxy_pid());
-
-       /* this event will trigger when we receive an attach signal
-        * from the recently dead load module */
-       (void)driver_select(port_num,report_exit->attach_event, DO_READ, 1);
-    }
-    else {
-       report_exit = NULL;
-    }
-
-    /* the return value is the pointer to the driver_data struct we created
-     * in this function, it will be used in the drivers input
-     * and output functions */
-    return (ErlDrvData)((!(read_write & DO_READ) && read_write & DO_WRITE)
-          ? &driver_data[ofd]
-          : &driver_data[ifd]);
-}
-
-static int spawn_init()
-{
-    int i;
-
-    driver_data = (struct driver_data *)
-      erts_alloc(ERTS_ALC_T_DRV_TAB, max_files * sizeof(struct driver_data));
-    erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-			    max_files * sizeof(struct driver_data));
-
-    for (i = 0; i < max_files; i++)
-        driver_data[i].pid = -1;
-
-   return 1;
-}
-
-static void
-init_fd_data(int fd, ErlDrvPort port_num)
-{
-    fd_data[fd].buf = NULL;
-    fd_data[fd].cpos = NULL;
-    fd_data[fd].remain = 0;
-    fd_data[fd].sz = 0;
-    fd_data[fd].psz = 0;
-}
-
-/* FIXME write a decent text on pipes on ose */
-static ErlDrvData
-spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* opts)
-{
-    int ifd[2];
-    int ofd[2];
-    static uint32_t ticker = 1;
-    PmStatus pm_status;
-    OSDOMAIN domain = PM_NEW_DOMAIN;
-    PROCESS progpid, mainbid, mainpid;
-    char *handle = NULL;
-    struct PmProgramInfo *info;
-    char *args = NULL;
-    char *tmp_handle;
-    ErlDrvData res = (ErlDrvData)-1;
-    int handle_size;
-    char *ptr;
-
-   
-    args = driver_alloc(strlen(name)+1);
-    strcpy(args, name);
-    /* We need to handle name in three parts 
-     * - install handle (must be unique)
-     * - install binary (needed for ose_pm_install_load_module())
-     * - full path (as argument to the spawned applications env.var
-     */
-
-    /* full path including arguments */
-    args = driver_alloc(strlen(name)+1);
-    strcpy(args, name);
-
-    /* handle path */
-    tmp_handle = strrchr(name, '/');
-    if (tmp_handle == NULL) {
-       tmp_handle = name;
-    }
-    else {
-       tmp_handle++;
-    }
-
-    /* handle args */
-    ptr = strchr(tmp_handle, ' ');
-    if (ptr != NULL) {
-       *ptr = '\0';
-       handle_size = ptr - tmp_handle;
-    }
-    else {
-       handle_size = strlen(name)+1;
-    }
-
-    /* make room for ticker */
-    handle_size += (ticker<10)?3:((ticker<100)?4:5);
-    handle = driver_alloc(handle_size);
-    
-    do {
-       snprintf(handle, handle_size, "%s_%d", tmp_handle, ticker);
-       pm_status = ose_pm_install_load_module(0, "ELF", name, handle,
-                                              0, 0, NULL);
-       ticker++;
-    } while (pm_status == PM_EINSTALL_HANDLE_ALREADY_INSTALLED);
-
-    if (pm_status != PM_SUCCESS) {
-       errno = ENOSYS; /* FIXME add comment */
-       return ERL_DRV_ERROR_ERRNO; 
-    }
-
-    /* Create Program */
-    pm_status = ose_pm_create_program(&domain, handle, 0, 0,
-                                      NULL, &progpid, &mainbid);
-    DEBUG_CHECK_RES(pm_status, PM_SUCCESS);
-
-    /* Get the mainpid from the newly created program */
-    pm_status = ose_pm_program_info(progpid, &info);
-    DEBUG_CHECK_RES(pm_status, PM_SUCCESS);
-
-    mainpid = info->main_process;
-    free_buf ((union SIGNAL **)&info);
-
-    /* pipevm needs to be started
-     * pipe will return 0 if success, -1 if not,
-     * errno will be set */
-    if (pipe(ifd) != 0 || pipe(ofd) != 0) {
-       DEBUG_CHECK_RES(0, -1);
-       ASSERT(0);
-    }
-
-    /* setup driver data */
-    res = set_driver_data(port_num, ofd[0], ifd[1], opts->packet_bytes,
-              opts->read_write, 1 /* opts->exit_status */, progpid);
-
-    /* init the fd_data array for read/write */
-    init_fd_data(ofd[0], port_num);
-    init_fd_data(ifd[1], port_num);
-
-    /* setup additional configurations
-     * for the spawned applications environment */
-    if (args != NULL) {
-       set_env(progpid, "ARGV", args);
-    }
-    set_env(mainbid, "EFS_RESOLVE_TMO", 0);
-    set_spawn_fd(ifd[0], 0, mainpid);
-    set_spawn_fd(ofd[1], 1, mainpid);
-    set_spawn_fd(ofd[1], 2, mainpid);
-
-    /* start the spawned program */
-    pm_status = ose_pm_start_program(mainbid);
-    DEBUG_CHECK_RES(pm_status, PM_SUCCESS);
-
-    /* close unused fd's */
-    close(ifd[0]);
-    close(ofd[1]);
-
-    if (handle) {
-       driver_free(handle);
-    }
-
-    return (ErlDrvData)res;
-}
-
-#define FD_DEF_HEIGHT 24
-#define FD_DEF_WIDTH 80
-/* Control op */
-#define FD_CTRL_OP_GET_WINSIZE 100
-
-static int fd_get_window_size(int fd, Uint32 *width, Uint32 *height)
-{
-#ifdef TIOCGWINSZ
-    struct winsize ws;
-    if (ioctl(fd,TIOCGWINSZ,&ws) == 0) {
-	*width = (Uint32) ws.ws_col;
-	*height = (Uint32) ws.ws_row;
-	return 0;
-    }
-#endif
-    return -1;
-}
-
-static ErlDrvSSizeT fd_control(ErlDrvData drv_data,
-			       unsigned int command,
-			       char *buf, ErlDrvSizeT len,
-			       char **rbuf, ErlDrvSizeT rlen)
-{
-   struct driver_data *data = (struct driver_data *)drv_data;
-    char resbuff[2*sizeof(Uint32)];
-    switch (command) {
-    case FD_CTRL_OP_GET_WINSIZE:
-	{
-	    Uint32 w,h;
-	    if (fd_get_window_size(data->ifd,&w,&h))
-		return 0;
-	    memcpy(resbuff,&w,sizeof(Uint32));
-	    memcpy(resbuff+sizeof(Uint32),&h,sizeof(Uint32));
-	}
-	break;
-    default:
-	return 0;
-    }
-    if (rlen < 2*sizeof(Uint32)) {
-	*rbuf = driver_alloc(2*sizeof(Uint32));
-    }
-    memcpy(*rbuf,resbuff,2*sizeof(Uint32));
-    return 2*sizeof(Uint32);
-}
-
-static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
-			   SysDriverOpts* opts)
-{
-    ErlDrvData res;
-
-    CHLD_STAT_LOCK;
-    if (opts->read_write & DO_READ) {
-	init_fd_data(opts->ifd, port_num);
-    }
-    if (opts->read_write & DO_WRITE) {
-	init_fd_data(opts->ofd, port_num);
-    }
-    res = set_driver_data(port_num, opts->ifd, opts->ofd,
-				      opts->packet_bytes,
-				      opts->read_write, 0, -1);
-    CHLD_STAT_UNLOCK;
-    return res;
-}
-
-static void clear_fd_data(int fd)
-{
-    if (fd_data[fd].sz > 0) {
-	erts_free(ERTS_ALC_T_FD_ENTRY_BUF, (void *) fd_data[fd].buf);
-	ASSERT(erts_smp_atomic_read_nob(&sys_misc_mem_sz) >= fd_data[fd].sz);
-	erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*fd_data[fd].sz);
-    }
-    fd_data[fd].buf = NULL;
-    fd_data[fd].sz = 0;
-    fd_data[fd].remain = 0;
-    fd_data[fd].cpos = NULL;
-    fd_data[fd].psz = 0;
-}
-
-static void nbio_stop_fd(ErlDrvPort prt, ErlDrvEvent ev)
-{
-    int *fd;
-    driver_select(prt,ev,DO_READ|DO_WRITE,0);
-    erl_drv_ose_event_fetch(ev, NULL, NULL, (void **)&fd);
-    clear_fd_data(*fd);
-    SET_BLOCKING(*fd);
-}
-
-static void fd_stop(ErlDrvData drv_data)  /* Does not close the fds */
-{
-   struct driver_data *data = (struct driver_data *)drv_data;
-
-   if (data->ofd != -1) {
-      if (data->ifd != data->ofd) { /* read and write */
-         nbio_stop_fd(data->port_num, data->input_event);
-         nbio_stop_fd(data->port_num, data->output_event);
-      }
-      else { /* write only */
-         nbio_stop_fd(data->port_num, data->output_event);
-      }
-   }
-   else { /* read only */
-      nbio_stop_fd(data->port_num, data->input_event);
-   }
-}
-
-
-static void erl_stop(ErlDrvData drv_data)
-{
-   struct driver_data *data = (struct driver_data *)drv_data;
-
-   CHLD_STAT_LOCK;
-   data->pid = -1;
-   CHLD_STAT_UNLOCK;
-
-   if (data->ofd != -1) {
-      if (data->ifd != data->ofd) { /* read and write */
-         nbio_stop_fd(data->port_num, data->input_event);
-         nbio_stop_fd(data->port_num, data->output_event);
-      }
-      else { /* write only */
-         nbio_stop_fd(data->port_num, data->output_event);
-      }
-   }
-   else { /* read only */
-      nbio_stop_fd(data->port_num, data->input_event);
-   }
-   close(data->ifd);
-   close(data->ofd);
-}
-
-/* The parameter e is a pointer to the driver_data structure
- * related to the fd to be used as output */
-static void output(ErlDrvData drv_data, char* buf, ErlDrvSizeT len)
-{
-    ErlDrvSizeT sz;
-    char lb[4];
-    char* lbp;
-    struct driver_data *data = (struct driver_data *)drv_data;
-
-    if (((data->packet_bytes == 2) &&
-             (len > 0xffff)) || (data->packet_bytes == 1 && len > 0xff)) {
-	driver_failure_posix(data->port_num, EINVAL);
-	return; /* -1; */
-    }
-    put_int32(len, lb);
-    lbp = lb + (4-(data->packet_bytes));
-
-    if ((sz = driver_sizeq(data->port_num)) > 0) {
-       if (data->packet_bytes != 0) {
-          driver_enq(data->port_num, lbp, data->packet_bytes);
-       }
-       driver_enq(data->port_num, buf, len);
-
-       if (sz + len + data->packet_bytes >= (1 << 13))
-	    set_busy_port(data->port_num, 1);
-    }
-    else {
-       char *pbbuf;
-       if (data->packet_bytes != 0) {
-          pbbuf = malloc(len + data->packet_bytes);
-          int i;
-          for (i = 0; i < data->packet_bytes; i++) {
-             *pbbuf++ = *lbp++;
-          }
-          strncpy(pbbuf, buf, len);
-          pbbuf -= data->packet_bytes;
-       }
-       driver_select(data->port_num, data->output_event,
-		      ERL_DRV_WRITE|ERL_DRV_USE, 1);
-       WRITE_AIO(data->ofd, 
-             (data->packet_bytes ? len+data->packet_bytes : len), 
-             (data->packet_bytes ? pbbuf : buf));
-       if (data->packet_bytes != 0) free(pbbuf);
-    }
-    return; /* 0; */
-}
-
-/* This function is being run when we in recieve
- * either a read of 0 bytes, or the attach signal from a dying
- * spawned load module */
-static int port_inp_failure(ErlDrvPort port_num, ErlDrvEvent ready_fd, int res)
-				/* Result: 0 (eof) or -1 (error) */
-{
-    int *fd;
-    SIGSELECT sig_no;
-    ASSERT(res <= 0);
-
-    erl_drv_ose_event_fetch(ready_fd,&sig_no, NULL, (void **)&fd);
-    /* As we need to handle two signals, we do this in two steps */
-    if (driver_data[*fd].alive) {
-       report_exit_status(driver_data[*fd].report_exit, 0); /* status? */
-    }
-    else {
-       driver_select(port_num,ready_fd,DO_READ|DO_WRITE,0);
-       clear_fd_data(*fd);
-       driver_report_exit(driver_data[*fd].port_num, driver_data[*fd].status);
-       /* As we do not really know if the spawn has crashed or exited nicely
-        * we do not check the result status of the following call.. FIXME
-        * can we handle this in a better way? */
-       ose_pm_uninstall_load_module(driver_data[*fd].install_handle);
-       driver_free(driver_data[*fd].install_handle);
-       driver_free((void *)driver_data[*fd].aiocb.aio_buf);
-
-       close(*fd);
-    }
-
-    return 0;
-}
-
-/* The parameter e is a pointer to the driver_data structure
- * related to the fd to be used as output.
- * ready_fd is the event that triggered this call to ready_input */
-static void ready_input(ErlDrvData drv_data, ErlDrvEvent ready_fd)
-{
-    int res;
-    Uint h;
-    char *buf;
-    union SIGNAL *sig;
-    struct driver_data *data = (struct driver_data *)drv_data;
-
-    sig = erl_drv_ose_get_signal(ready_fd);
-    ASSERT(sig);
-
-
-   while (sig) {
-      /* If we've recieved an attach signal, we need to handle
-       * it in port_inp_failure */
-      if (sig->sig_no == ERTS_SIGNAL_OSE_DRV_ATTACH) {
-         port_inp_failure(data->port_num, ready_fd, 0);
-       }
-       else {
-          res = sig->fm_read_reply.actual;
-          if (res == 0) {
-             port_inp_failure(data->port_num, ready_fd, res);
-             break;
-          }
-
-          if (data->packet_bytes == 0) {
-             if (res < 0) {
-                if ((errno != EINTR) && (errno != ERRNO_BLOCK)) {
-                   port_inp_failure(data->port_num, ready_fd, res);
-                }
-             }
-             else if (res == 0) {
-                /* read of 0 bytes, eof, otherside of pipe is assumed dead */
-                port_inp_failure(data->port_num, ready_fd, res);
-                break;
-             }
-             else {
-                buf = driver_alloc(res);
-                memcpy(buf, (void *)data->aiocb.aio_buf, res);
-                driver_select(data->port_num, data->output_event,
-                      ERL_DRV_WRITE|ERL_DRV_USE, 1);
-                driver_output(data->port_num, (char*) buf, res);
-                driver_free(buf);
-             }
-                /* clear the previous read */
-                memset(data->aiocb.aio_buf, 0, res);
-
-                /* issue a new read */
-                DISPATCH_AIO(sig);
-                aio_read(&data->aiocb);
-          }
-          else if (data->packet_bytes && fd_data[data->ifd].remain > 0) {
-             /* we've read a partial package, or a header */
-
-             if (res == fd_data[data->ifd].remain) { /* we are done! */
-                char *buf = data->aiocb.aio_buf;
-                int i;
-
-                /* do we have anything buffered? */
-                if (fd_data[data->ifd].buf != NULL) {
-                   memcpy(fd_data[data->ifd].buf + fd_data[data->ifd].sz,
-                          buf, res);
-                   buf = fd_data[data->ifd].buf;
-                }
-
-                fd_data[data->ifd].sz += res;
-                driver_output(data->port_num, buf, (fd_data[data->ifd].sz>0?fd_data[data->ifd].sz:res));
-                clear_fd_data(data->ifd);
-
-                /* clear the previous read */
-                memset(data->aiocb.aio_buf, 0, res);
-             
-                /* issue a new read */
-                DISPATCH_AIO(sig);
-                data->aiocb.aio_nbytes = data->packet_bytes;
-
-                if (data->aiocb.aio_buf == NULL) {
-                   port_inp_failure(data->port_num, ready_fd, -1);
-                }
-                aio_read(&data->aiocb);
-             }
-             else if(res < fd_data[data->ifd].remain) { /* received part of a package */
-                if (fd_data[data->ifd].sz == 0) {
-
-                   fd_data[data->ifd].sz += res;
-                   memcpy(fd_data[data->ifd].buf, data->aiocb.aio_buf, res);
-                   fd_data[data->ifd].remain -= res;
-                }
-                else {
-                   memcpy(fd_data[data->ifd].buf + fd_data[data->ifd].sz,
-                          data->aiocb.aio_buf, res);
-                   fd_data[data->ifd].sz += res;
-                   fd_data[data->ifd].remain -= res;
-                }
-                /* clear the previous read */
-                memset(data->aiocb.aio_buf, 0, res);
-
-                /* issue a new read */
-                DISPATCH_AIO(sig);
-                data->aiocb.aio_nbytes = fd_data[data->ifd].remain;
-
-                if (data->aiocb.aio_buf == NULL) {
-                    port_inp_failure(data->port_num, ready_fd, -1);
-                }
-                aio_read(&data->aiocb);
-             }
-          }
-          else if (data->packet_bytes && fd_data[data->ifd].remain == 0) { /* we've recieved a header */
-
-             /* analyze the header FIXME  */
-             switch (data->packet_bytes) {
-                case 1: h = get_int8(data->aiocb.aio_buf);  break;
-                case 2: h = get_int16(data->aiocb.aio_buf); break;
-                case 4: h = get_int32(data->aiocb.aio_buf); break;
-             }
-
-             fd_data[data->ifd].buf = erts_alloc_fnf(ERTS_ALC_T_FD_ENTRY_BUF, h + data->packet_bytes);
-             fd_data[data->ifd].remain = ((h + data->packet_bytes) - res);
-
-             /* clear the previous read */
-             memset(data->aiocb.aio_buf, 0, data->packet_bytes);
-
-             /* issue a new read */
-             DISPATCH_AIO(sig);
-             data->aiocb.aio_nbytes = h;
-
-             if (data->aiocb.aio_buf == NULL) {
-                port_inp_failure(data->port_num, ready_fd, -1);
-             }
-             aio_read(&data->aiocb);
-          }
-       }
-       sig = erl_drv_ose_get_signal(ready_fd);
-    }
-}
-
-
-/* The parameter e is a pointer to the driver_data structure
- * related to the fd to be used as output.
- * ready_fd is the event that triggered this call to ready_input */
-static void ready_output(ErlDrvData drv_data, ErlDrvEvent ready_fd)
-{
-   SysIOVec *iov;
-   int vlen;
-   int res;
-   union SIGNAL *sig;
-   struct driver_data *data = (struct driver_data *)drv_data;
-
-   sig = erl_drv_ose_get_signal(ready_fd);
-   ASSERT(sig);
-
-   while (sig != NULL) {
-      if (sig->fm_write_reply.actual <= 0) {
-         int status;
-
-         status = efs_status_to_errno(sig->fm_write_reply.status);
-         driver_select(data->port_num, ready_fd, ERL_DRV_WRITE, 0);
-         DISPATCH_AIO(sig);
-         FREE_AIO(sig->fm_write_reply.buffer);
-
-         driver_failure_posix(data->port_num, status);
-      }
-      else { /* written bytes > 0 */
-          iov = driver_peekq(data->port_num, &vlen);
-          if (vlen > 0) {
-             DISPATCH_AIO(sig);
-             FREE_AIO(sig->fm_write_reply.buffer);
-             res = driver_deq(data->port_num, iov[0].iov_len);
-             if (res > 0) { 
-                iov = driver_peekq(data->port_num, &vlen);
-                WRITE_AIO(data->ofd, iov[0].iov_len, iov[0].iov_base);
-             }
-         }
-         else if (vlen == 0) {
-            DISPATCH_AIO(sig);
-            FREE_AIO(sig->fm_write_reply.buffer);
-         }
-
-      }
-      sig = erl_drv_ose_get_signal(ready_fd);
-   }
-}
-
-static void stop_select(ErlDrvEvent ready_fd, void* _)
-{
-   int *fd;
-   erl_drv_ose_event_fetch(ready_fd, NULL, NULL, (void **)&fd);
-   erl_drv_ose_event_free(ready_fd);
-   close(*fd);
-}
-
-
-void erts_do_break_handling(void)
-{
-    struct termios temp_mode;
-    int saved = 0;
-
-    /*
-     * Most functions that do_break() calls are intentionally not thread safe;
-     * therefore, make sure that all threads but this one are blocked before
-     * proceeding!
-     */
-    erts_smp_thr_progress_block();
-
-    /* during break we revert to initial settings */
-    /* this is done differently for oldshell */
-    if (using_oldshell && !replace_intr) {
-      SET_BLOCKING(1);
-    }
-    else if (isatty(0)) {
-      tcgetattr(0,&temp_mode);
-      tcsetattr(0,TCSANOW,&initial_tty_mode);
-      saved = 1;
-    }
-
-    /* call the break handling function, reset the flag */
-    do_break();
-
-    fflush(stdout);
-
-    /* after break we go back to saved settings */
-    if (using_oldshell && !replace_intr) {
-      SET_NONBLOCKING(1);
-    }
-    else if (saved) {
-      tcsetattr(0,TCSANOW,&temp_mode);
-    }
-
-    erts_smp_thr_progress_unblock();
-}
-
-static pid_t
-getpid(void)
-{
-   return get_bid(current_process());
-}
-
-int getpagesize(void)
-{
-   return 1024;
-}
-
-
-/* Fills in the systems representation of the jam/beam process identifier.
-** The Pid is put in STRING representation in the supplied buffer,
-** no interpretatione of this should be done by the rest of the
-** emulator. The buffer should be at least 21 bytes long.
-*/
-void sys_get_pid(char *buffer, size_t buffer_size){
-    pid_t p = getpid();
-    /* Assume the pid is scalar and can rest in an unsigned long... */
-    erts_snprintf(buffer, buffer_size, "%lu",(unsigned long) p);
-}
-
-int
-erts_sys_putenv_raw(char *key, char *value) {
-    return erts_sys_putenv(key, value);
-}
-int
-erts_sys_putenv(char *key, char *value)
-{
-    int res;
-
-    erts_smp_rwmtx_rwlock(&environ_rwmtx);
-    res = set_env(get_bid(current_process()), key,
-		  value);
-    erts_smp_rwmtx_rwunlock(&environ_rwmtx);
-    return res;
-}
-
-
-int
-erts_sys_unsetenv(char *key)
-{
-    int res;
-
-    erts_smp_rwmtx_rwlock(&environ_rwmtx);
-    res = set_env(get_bid(current_process()),key,NULL);
-    erts_smp_rwmtx_rwunlock(&environ_rwmtx);
-
-    return res;
-}
-
-int
-erts_sys_getenv__(char *key, char *value, size_t *size)
-{
-    int res;
-    char *orig_value = get_env(get_bid(current_process()), key);
-    if (!orig_value)
-	res = -1;
-    else {
-	size_t len = sys_strlen(orig_value);
-	if (len >= *size) {
-	    *size = len + 1;
-	    res = 1;
-	}
-	else {
-	    *size = len;
-	    sys_memcpy((void *) value, (void *) orig_value, len+1);
-	    res = 0;
-	}
-	free_buf((union SIGNAL **)&orig_value);
-    }
-    return res;
-}
-
-int
-erts_sys_getenv_raw(char *key, char *value, size_t *size) {
-    return erts_sys_getenv(key, value, size);
-}
-
-/*
- * erts_sys_getenv
- * returns:
- *  -1, if environment key is not set with a value
- *   0, if environment key is set and value fits into buffer res
- *   1, if environment key is set but does not fit into buffer res
- *      res is set with the needed buffer res value
- */
-
-int
-erts_sys_getenv(char *key, char *value, size_t *size)
-{
-    int res;
-    erts_smp_rwmtx_rlock(&environ_rwmtx);
-    res = erts_sys_getenv__(key, value, size);
-    erts_smp_rwmtx_runlock(&environ_rwmtx);
-    return res;
-}
-
-void
-sys_init_io(void)
-{
-    fd_data = (struct fd_data *)
-	erts_alloc(ERTS_ALC_T_FD_TAB, max_files * sizeof(struct fd_data));
-    erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-			    max_files * sizeof(struct fd_data));
-}
-
-extern const char pre_loaded_code[];
-extern Preload pre_loaded[];
-
-void erts_sys_alloc_init(void)
-{
-}
-
-void *erts_sys_alloc(ErtsAlcType_t t, void *x, Uint sz)
-{
-    void *res = malloc((size_t) sz);
-#if HAVE_ERTS_MSEG
-    if (!res) {
-	erts_mseg_clear_cache();
-	return malloc((size_t) sz);
-    }
-#endif
-    return res;
-}
-
-void *erts_sys_realloc(ErtsAlcType_t t, void *x, void *p, Uint sz)
-{
-    void *res = realloc(p, (size_t) sz);
-#if HAVE_ERTS_MSEG
-    if (!res) {
-	erts_mseg_clear_cache();
-	return realloc(p, (size_t) sz);
-    }
-#endif
-    return res;
-}
-
-void erts_sys_free(ErtsAlcType_t t, void *x, void *p)
-{
-    free(p);
-}
-
-/* Return a pointer to a vector of names of preloaded modules */
-
-Preload*
-sys_preloaded(void)
-{
-    return pre_loaded;
-}
-
-/* Return a pointer to preloaded code for module "module" */
-unsigned char*
-sys_preload_begin(Preload* p)
-{
-    return p->code;
-}
-
-/* Clean up if allocated */
-void sys_preload_end(Preload* p)
-{
-    /* Nothing */
-}
-
-/* Read a key from console (?) */
-
-int sys_get_key(fd)
-int fd;
-{
-    int c;
-    unsigned char rbuf[64];
-
-    fflush(stdout);		/* Flush query ??? */
-
-    if ((c = read(fd,rbuf,64)) <= 0) {
-      return c;
-    }
-
-    return rbuf[0];
-}
-
-
-#ifdef DEBUG
-
-extern int erts_initialized;
-void
-erl_assert_error(const char* expr, const char* func,
-		 const char* file, int line)
-{
-    fflush(stdout);
-    fprintf(stderr, "%s:%d:%s() Assertion failed: %s\n",
-	    file, line, func, expr);
-    fflush(stderr);
-    ramlog_printf("%s:%d:%s() Assertion failed: %s\n",
-		  file, line, func, expr);
-
-    abort();
-}
-
-void
-erl_debug(char* fmt, ...)
-{
-    char sbuf[1024];		/* Temporary buffer. */
-    va_list va;
-
-    if (debug_log) {
-	va_start(va, fmt);
-	vsprintf(sbuf, fmt, va);
-	va_end(va);
-	fprintf(stderr, "%s", sbuf);
-    }
-}
-
-#endif /* DEBUG */
-
-static ERTS_INLINE void
-report_exit_status(ErtsSysReportExit *rep, int status)
-{
-   if (rep->ifd >= 0) {
-      driver_data[rep->ifd].alive = 0;
-      driver_data[rep->ifd].status = status;
-   }
-   if (rep->ofd >= 0) {
-      driver_data[rep->ofd].alive = 0;
-      driver_data[rep->ofd].status = status;
-   }
-
-   erts_free(ERTS_ALC_T_PRT_REP_EXIT, rep);
-}
-
-#define ERTS_REPORT_EXIT_STATUS report_exit_status
-
-/*
- * Called from schedule() when it runs out of runnable processes,
- * or when Erlang code has performed INPUT_REDUCTIONS reduction
- * steps. runnable == 0 iff there are no runnable Erlang processes.
- */
-void
-erl_sys_schedule(int runnable)
-{
-    ASSERT(get_fsem(current_process()) == 0);
-#ifdef ERTS_SMP
-    ASSERT(erts_get_scheduler_data()->no == 1);
-    ERTS_CHK_IO(!runnable);
-#else
-    ERTS_CHK_IO( 1 );
-#endif
-    ASSERT(get_fsem(current_process()) == 0);
-    ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking());
-}
-
-
-#ifdef ERTS_SMP
-
-void
-erts_sys_main_thread(void)
-{
-    erts_thread_disable_fpe();
-
-    /* Become signal receiver thread... */
-#ifdef ERTS_ENABLE_LOCK_CHECK
-    erts_lc_set_thread_name("signal_receiver");
-#endif
-
-    while (1) {
-       static const SIGSELECT sigsel[] = {0};
-       union SIGNAL *msg = receive(sigsel);
-
-       fprintf(stderr,"Main thread got message %d from 0x%x!!\r\n",
-               msg->sig_no, sender(&msg));
-       free_buf(&msg);
-    }
-}
-
-#endif /* ERTS_SMP */
-
-void
-erl_sys_args(int* argc, char** argv)
-{
-    int i, j;
-
-    erts_smp_rwmtx_init(&environ_rwmtx, "environ");
-
-    init_check_io();
-
-    /* Handled arguments have been marked with NULL. Slide arguments
-       not handled towards the beginning of argv. */
-    for (i = 0, j = 0; i < *argc; i++) {
-	if (argv[i])
-	    argv[j++] = argv[i];
-    }
-    *argc = j;
-
-}
diff --git a/erts/emulator/sys/ose/sys_float.c b/erts/emulator/sys/ose/sys_float.c
deleted file mode 100644
index 3d9abc6bd1..0000000000
--- a/erts/emulator/sys/ose/sys_float.c
+++ /dev/null
@@ -1,845 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2001-2013. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-
-#include "sys.h"
-#include "global.h"
-#include "erl_process.h"
-
-
-#ifdef NO_FPE_SIGNALS
-
-void
-erts_sys_init_float(void)
-{
-# ifdef SIGFPE
-    sys_sigset(SIGFPE, SIG_IGN); /* Ignore so we can test for NaN and Inf */
-# endif
-}
-
-#else  /* !NO_FPE_SIGNALS */
-
-#ifdef ERTS_SMP
-static erts_tsd_key_t fpe_key;
-
-/* once-only initialisation early in the main thread (via erts_sys_init_float()) */
-static void erts_init_fp_exception(void)
-{
-    /* XXX: the wrappers prevent using a pthread destructor to
-       deallocate the key's value; so when/where do we do that? */
-    erts_tsd_key_create(&fpe_key);
-}
-
-void erts_thread_init_fp_exception(void)
-{
-    unsigned long *fpe = erts_alloc(ERTS_ALC_T_FP_EXCEPTION, sizeof(*fpe));
-    *fpe = 0L;
-    erts_tsd_set(fpe_key, fpe);
-}
-
-static ERTS_INLINE volatile unsigned long *erts_thread_get_fp_exception(void)
-{
-    return (volatile unsigned long*)erts_tsd_get(fpe_key);
-}
-#else /* !SMP */
-#define erts_init_fp_exception()	/*empty*/
-static volatile unsigned long fp_exception;
-#define erts_thread_get_fp_exception()	(&fp_exception)
-#endif /* SMP */
-
-volatile unsigned long *erts_get_current_fp_exception(void)
-{
-    Process *c_p;
-
-    c_p = erts_get_current_process();
-    if (c_p)
-	return &c_p->fp_exception;
-    return erts_thread_get_fp_exception();
-}
-
-static void set_current_fp_exception(unsigned long pc)
-{
-    volatile unsigned long *fpexnp = erts_get_current_fp_exception();
-    ASSERT(fpexnp != NULL);
-    *fpexnp = pc;
-}
-
-void erts_fp_check_init_error(volatile unsigned long *fpexnp)
-{
-    char buf[64];
-    snprintf(buf, sizeof buf, "ERTS_FP_CHECK_INIT at %p: detected unhandled FPE at %p\r\n",
-	     __builtin_return_address(0), (void*)*fpexnp);
-    if (write(2, buf, strlen(buf)) <= 0)
-	erl_exit(ERTS_ABORT_EXIT, "%s", buf);
-    *fpexnp = 0;
-#if defined(__i386__) || defined(__x86_64__)
-    erts_restore_fpu();
-#endif
-}
-
-/* Is there no standard identifier for Darwin/MacOSX ? */
-#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
-#define __DARWIN__ 1
-#endif
-
-#if (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__)
-
-static void unmask_x87(void)
-{
-    unsigned short cw;
-
-    __asm__ __volatile__("fstcw %0" : "=m"(cw));
-    cw &= ~(0x01|0x04|0x08);   /* unmask IM, ZM, OM */
-    __asm__ __volatile__("fldcw %0" : : "m"(cw));
-}
-
-/* mask x87 FPE, return true if the previous state was unmasked */
-static int mask_x87(void)
-{
-    unsigned short cw;
-    int unmasked;
-
-    __asm__ __volatile__("fstcw %0" : "=m"(cw));
-    unmasked = (cw & (0x01|0x04|0x08)) == 0;
-    /* or just set cw = 0x37f */
-    cw |= (0x01|0x04|0x08); /* mask IM, ZM, OM */
-    __asm__ __volatile__("fldcw %0" : : "m"(cw));
-    return unmasked;
-}
-
-static void unmask_sse2(void)
-{
-    unsigned int mxcsr;
-
-    __asm__ __volatile__("stmxcsr %0" : "=m"(mxcsr));
-    mxcsr &= ~(0x003F|0x0680); /* clear exn flags, unmask OM, ZM, IM (not PM, UM, DM) */
-    __asm__ __volatile__("ldmxcsr %0" : : "m"(mxcsr));
-}
-
-/* mask SSE2 FPE, return true if the previous state was unmasked */
-static int mask_sse2(void)
-{
-    unsigned int mxcsr;
-    int unmasked;
-
-    __asm__ __volatile__("stmxcsr %0" : "=m"(mxcsr));
-    unmasked = (mxcsr & 0x0680) == 0;
-    /* or just set mxcsr = 0x1f80 */
-    mxcsr &= ~0x003F; /* clear exn flags */
-    mxcsr |=  0x0680; /* mask OM, ZM, IM (not PM, UM, DM) */
-    __asm__ __volatile__("ldmxcsr %0" : : "m"(mxcsr));
-    return unmasked;
-}
-
-#if defined(__x86_64__)
-
-static inline int cpu_has_sse2(void) { return 1; }
-
-#else /* !__x86_64__ */
-
-/*
- * Check if an x86-32 processor has SSE2.
- */
-static unsigned int xor_eflags(unsigned int mask)
-{
-    unsigned int eax, edx;
-
-    eax = mask;			/* eax = mask */
-    __asm__("pushfl\n\t"
-	    "popl %0\n\t"	/* edx = original EFLAGS */
-	    "xorl %0, %1\n\t"	/* eax = mask ^ EFLAGS */
-	    "pushl %1\n\t"
-	    "popfl\n\t"		/* new EFLAGS = mask ^ original EFLAGS */
-	    "pushfl\n\t"
-	    "popl %1\n\t"	/* eax = new EFLAGS */
-	    "xorl %0, %1\n\t"	/* eax = new EFLAGS ^ old EFLAGS */
-	    "pushl %0\n\t"
-	    "popfl"		/* restore original EFLAGS */
-	    : "=d"(edx), "=a"(eax)
-	    : "1"(eax));
-    return eax;
-}
-
-static __inline__ unsigned int cpuid_eax(unsigned int op)
-{
-    unsigned int eax, save_ebx;
-
-    /* In PIC mode i386 reserves EBX. So we must save
-       and restore it ourselves to not upset gcc. */
-    __asm__(
-	"movl %%ebx, %1\n\t"
-	"cpuid\n\t"
-	"movl %1, %%ebx"
-	: "=a"(eax), "=m"(save_ebx)
-	: "0"(op)
-	: "cx", "dx");
-    return eax;
-}
-
-static __inline__ unsigned int cpuid_edx(unsigned int op)
-{
-    unsigned int eax, edx, save_ebx;
-
-    /* In PIC mode i386 reserves EBX. So we must save
-       and restore it ourselves to not upset gcc. */
-    __asm__(
-	"movl %%ebx, %2\n\t"
-	"cpuid\n\t"
-	"movl %2, %%ebx"
-	: "=a"(eax), "=d"(edx), "=m"(save_ebx)
-	: "0"(op)
-	: "cx");
-    return edx;
-}
-
-/* The AC bit, bit #18, is a new bit introduced in the EFLAGS
- * register on the Intel486 processor to generate alignment
- * faults. This bit cannot be set on the Intel386 processor.
- */
-static __inline__ int is_386(void)
-{
-    return ((xor_eflags(1<<18) >> 18) & 1) == 0;
-}
-
-/* Newer x86 processors have a CPUID instruction, as indicated by
- * the ID bit (#21) in EFLAGS being modifiable.
- */
-static __inline__ int has_CPUID(void)
-{
-    return (xor_eflags(1<<21) >> 21) & 1;
-}
-
-static int cpu_has_sse2(void)
-{
-    unsigned int maxlev, features;
-    static int has_sse2 = -1;
-
-    if (has_sse2 >= 0)
-	return has_sse2;
-    has_sse2 = 0;
-
-    if (is_386())
-	return 0;
-    if (!has_CPUID())
-	return 0;
-    maxlev = cpuid_eax(0);
-    /* Intel A-step Pentium had a preliminary version of CPUID.
-       It also didn't have SSE2. */
-    if ((maxlev & 0xFFFFFF00) == 0x0500)
-	return 0;
-    /* If max level is zero then CPUID cannot report any features. */
-    if (maxlev == 0)
-	return 0;
-    features = cpuid_edx(1);
-    has_sse2 = (features & (1 << 26)) != 0;
-
-    return has_sse2;
-}
-#endif /* !__x86_64__ */
-
-static void unmask_fpe(void)
-{
-    __asm__ __volatile__("fnclex");
-    unmask_x87();
-    if (cpu_has_sse2())
-	unmask_sse2();
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
-    if (unmasked)
-	unmask_fpe();
-}
-
-/* mask x86 FPE, return true if the previous state was unmasked */
-static int mask_fpe(void)
-{
-    int unmasked;
-
-    unmasked = mask_x87();
-    if (cpu_has_sse2())
-	unmasked |= mask_sse2();
-    return unmasked;
-}
-
-void erts_restore_fpu(void)
-{
-    __asm__ __volatile__("fninit");
-    unmask_x87();
-    if (cpu_has_sse2())
-	unmask_sse2();
-}
-
-#elif defined(__sparc__) && defined(__linux__)
-
-#if defined(__arch64__)
-#define LDX "ldx"
-#define STX "stx"
-#else
-#define LDX "ld"
-#define STX "st"
-#endif
-
-static void unmask_fpe(void)
-{
-    unsigned long fsr;
-
-    __asm__(STX " %%fsr, %0" : "=m"(fsr));
-    fsr &= ~(0x1FUL << 23);	/* clear FSR[TEM] field */
-    fsr |= (0x1AUL << 23);	/* enable NV, OF, DZ exceptions */
-    __asm__ __volatile__(LDX " %0, %%fsr" : : "m"(fsr));
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
-    if (unmasked)
-	unmask_fpe();
-}
-
-/* mask SPARC FPE, return true if the previous state was unmasked */
-static int mask_fpe(void)
-{
-    unsigned long fsr;
-    int unmasked;
-
-    __asm__(STX " %%fsr, %0" : "=m"(fsr));
-    unmasked = ((fsr >> 23) & 0x1A) == 0x1A;
-    fsr &= ~(0x1FUL << 23);	/* clear FSR[TEM] field */
-    __asm__ __volatile__(LDX " %0, %%fsr" : : "m"(fsr));
-    return unmasked;
-}
-
-#elif (defined(__powerpc__) && defined(__linux__)) || (defined(__ppc__) && defined(__DARWIN__))
-
-#if defined(__linux__)
-#include <sys/prctl.h>
-
-static void set_fpexc_precise(void)
-{
-    if (prctl(PR_SET_FPEXC, PR_FP_EXC_PRECISE) < 0) {
-	perror("PR_SET_FPEXC");
-	exit(1);
-    }
-}
-
-#elif defined(__DARWIN__)
-
-#include <mach/mach.h>
-#include <pthread.h>
-
-/*
- * FE0 FE1	MSR bits
- *  0   0	floating-point exceptions disabled
- *  0   1	floating-point imprecise nonrecoverable
- *  1   0	floating-point imprecise recoverable
- *  1   1	floating-point precise mode
- *
- * Apparently:
- * - Darwin 5.5 (MacOS X <= 10.1) starts with FE0 == FE1 == 0,
- *   and resets FE0 and FE1 to 0 after each SIGFPE.
- * - Darwin 6.0 (MacOS X 10.2) starts with FE0 == FE1 == 1,
- *   and does not reset FE0 or FE1 after a SIGFPE.
- */
-#define FE0_MASK	(1<<11)
-#define FE1_MASK	(1<<8)
-
-/* a thread cannot get or set its own MSR bits */
-static void *fpu_fpe_enable(void *arg)
-{
-    thread_t t = *(thread_t*)arg;
-    struct ppc_thread_state state;
-    unsigned int state_size = PPC_THREAD_STATE_COUNT;
-
-    if (thread_get_state(t, PPC_THREAD_STATE, (natural_t*)&state, &state_size) != KERN_SUCCESS) {
-	perror("thread_get_state");
-	exit(1);
-    }
-    if ((state.srr1 & (FE1_MASK|FE0_MASK)) != (FE1_MASK|FE0_MASK)) {
-#if 1
-	/* This would also have to be performed in the SIGFPE handler
-	   to work around the MSR reset older Darwin releases do. */
-	state.srr1 |= (FE1_MASK|FE0_MASK);
-	thread_set_state(t, PPC_THREAD_STATE, (natural_t*)&state, state_size);
-#else
-	fprintf(stderr, "srr1 == 0x%08x, your Darwin is too old\n", state.srr1);
-	exit(1);
-#endif
-    }
-    return NULL; /* Ok, we appear to be on Darwin 6.0 or later */
-}
-
-static void set_fpexc_precise(void)
-{
-    thread_t self = mach_thread_self();
-    pthread_t enabler;
-
-    if (pthread_create(&enabler, NULL, fpu_fpe_enable, &self)) {
-	perror("pthread_create");
-    } else if (pthread_join(enabler, NULL)) {
-	perror("pthread_join");
-    }
-}
-
-#endif
-
-static void set_fpscr(unsigned int fpscr)
-{
-    union {
-	double d;
-	unsigned int fpscr[2];
-    } u;
-
-    u.fpscr[0] = 0xFFF80000;
-    u.fpscr[1] = fpscr;
-    __asm__ __volatile__("mtfsf 255,%0" : : "f"(u.d));
-}
-
-static unsigned int get_fpscr(void)
-{
-    union {
-	double d;
-	unsigned int fpscr[2];
-    } u;
-
-    __asm__("mffs %0" : "=f"(u.d));
-    return u.fpscr[1];
-}
-
-static void unmask_fpe(void)
-{
-    set_fpexc_precise();
-    set_fpscr(0x80|0x40|0x10);	/* VE, OE, ZE; not UE or XE */
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
-    if (unmasked)
-	unmask_fpe();
-}
-
-/* mask PowerPC FPE, return true if the previous state was unmasked */
-static int mask_fpe(void)
-{
-    int unmasked;
-
-    unmasked = (get_fpscr() & (0x80|0x40|0x10)) == (0x80|0x40|0x10);
-    set_fpscr(0x00);
-    return unmasked;
-}
-
-#else
-
-static void unmask_fpe(void)
-{
-    fpsetmask(FP_X_INV | FP_X_OFL | FP_X_DZ);
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
-    if (unmasked)
-	unmask_fpe();
-}
-
-/* mask IEEE FPE, return true if previous state was unmasked */
-static int mask_fpe(void)
-{
-    const fp_except unmasked_mask = FP_X_INV | FP_X_OFL | FP_X_DZ;
-    fp_except old_mask;
-
-    old_mask = fpsetmask(0);
-    return (old_mask & unmasked_mask) == unmasked_mask;
-}
-
-#endif
-
-#if (defined(__linux__) && (defined(__i386__) || defined(__x86_64__) || defined(__sparc__) || defined(__powerpc__))) || (defined(__DARWIN__) && (defined(__i386__) || defined(__x86_64__) || defined(__ppc__))) || (defined(__FreeBSD__) && (defined(__x86_64__) || defined(__i386__))) || ((defined(__NetBSD__) || defined(__OpenBSD__)) && defined(__x86_64__)) || (defined(__sun__) && defined(__x86_64__))
-
-#if defined(__linux__) && defined(__i386__)
-#if !defined(X86_FXSR_MAGIC)
-#define X86_FXSR_MAGIC 0x0000
-#endif
-#elif defined(__FreeBSD__) && defined(__x86_64__)
-#include <sys/types.h>
-#include <machine/fpu.h>
-#elif defined(__FreeBSD__) && defined(__i386__)
-#include <sys/types.h>
-#include <machine/npx.h>
-#elif defined(__DARWIN__)
-#include <machine/signal.h>
-#elif defined(__OpenBSD__) && defined(__x86_64__)
-#include <sys/types.h>
-#include <machine/fpu.h>
-#endif
-#if !(defined(__OpenBSD__) && defined(__x86_64__))
-#include <ucontext.h>
-#endif
-#include <string.h>
-
-#if defined(__linux__) && defined(__x86_64__)
-#define mc_pc(mc)	((mc)->gregs[REG_RIP])
-#elif defined(__linux__) && defined(__i386__)
-#define mc_pc(mc)	((mc)->gregs[REG_EIP])
-#elif defined(__DARWIN__) && defined(__i386__)
-#ifdef DARWIN_MODERN_MCONTEXT
-#define mc_pc(mc)	((mc)->__ss.__eip)
-#else
-#define mc_pc(mc)	((mc)->ss.eip)
-#endif
-#elif defined(__DARWIN__) && defined(__x86_64__)
-#ifdef DARWIN_MODERN_MCONTEXT
-#define mc_pc(mc)	((mc)->__ss.__rip)
-#else
-#define mc_pc(mc)	((mc)->ss.rip)
-#endif
-#elif defined(__FreeBSD__) && defined(__x86_64__)
-#define mc_pc(mc)	((mc)->mc_rip)
-#elif defined(__FreeBSD__) && defined(__i386__)
-#define mc_pc(mc)	((mc)->mc_eip)
-#elif defined(__NetBSD__) && defined(__x86_64__)
-#define mc_pc(mc)	((mc)->__gregs[_REG_RIP])
-#elif defined(__NetBSD__) && defined(__i386__)
-#define mc_pc(mc)	((mc)->__gregs[_REG_EIP])
-#elif defined(__OpenBSD__) && defined(__x86_64__)
-#define mc_pc(mc)	((mc)->sc_rip)
-#elif defined(__sun__) && defined(__x86_64__)
-#define mc_pc(mc)	((mc)->gregs[REG_RIP])
-#endif
-
-static void fpe_sig_action(int sig, siginfo_t *si, void *puc)
-{
-    ucontext_t *uc = puc;
-    unsigned long pc;
-
-#if defined(__linux__)
-#if defined(__x86_64__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    fpregset_t fpstate = mc->fpregs;
-    pc = mc_pc(mc);
-    /* A failed SSE2 instruction will restart. To avoid
-       looping we mask SSE2 exceptions now and unmask them
-       again later in erts_check_fpe()/erts_restore_fpu().
-       On RISCs we update PC to skip the failed instruction,
-       but the ever increasing complexity of the x86 instruction
-       set encoding makes that a poor solution here. */
-    fpstate->mxcsr = 0x1F80;
-    fpstate->swd &= ~0xFF;
-#elif defined(__i386__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    fpregset_t fpstate = mc->fpregs;
-    pc = mc_pc(mc);
-    if ((fpstate->status >> 16) == X86_FXSR_MAGIC)
-	((struct _fpstate*)fpstate)->mxcsr = 0x1F80;
-    fpstate->sw &= ~0xFF;
-#elif defined(__sparc__) && defined(__arch64__)
-    /* on SPARC the 3rd parameter points to a sigcontext not a ucontext */
-    struct sigcontext *sc = (struct sigcontext*)puc;
-    pc = sc->sigc_regs.tpc;
-    sc->sigc_regs.tpc = sc->sigc_regs.tnpc;
-    sc->sigc_regs.tnpc += 4;
-#elif defined(__sparc__)
-    /* on SPARC the 3rd parameter points to a sigcontext not a ucontext */
-    struct sigcontext *sc = (struct sigcontext*)puc;
-    pc = sc->si_regs.pc;
-    sc->si_regs.pc = sc->si_regs.npc;
-    sc->si_regs.npc = (unsigned long)sc->si_regs.npc + 4;
-#elif defined(__powerpc__)
-#if defined(__powerpc64__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    unsigned long *regs = &mc->gp_regs[0];
-#else
-    mcontext_t *mc = uc->uc_mcontext.uc_regs;
-    unsigned long *regs = &mc->gregs[0];
-#endif
-    pc = regs[PT_NIP];
-    regs[PT_NIP] += 4;
-    regs[PT_FPSCR] = 0x80|0x40|0x10;	/* VE, OE, ZE; not UE or XE */
-#endif
-#elif defined(__DARWIN__) && (defined(__i386__) || defined(__x86_64__))
-#ifdef DARWIN_MODERN_MCONTEXT
-    mcontext_t mc = uc->uc_mcontext;
-    pc = mc_pc(mc);
-    mc->__fs.__fpu_mxcsr = 0x1F80;
-    *(unsigned short *)&mc->__fs.__fpu_fsw &= ~0xFF;
-#else
-    mcontext_t mc = uc->uc_mcontext;
-    pc = mc_pc(mc);
-    mc->fs.fpu_mxcsr = 0x1F80;
-    *(unsigned short *)&mc->fs.fpu_fsw &= ~0xFF;
-#endif /* DARWIN_MODERN_MCONTEXT */
-#elif defined(__DARWIN__) && defined(__ppc__)
-    mcontext_t mc = uc->uc_mcontext;
-    pc = mc->ss.srr0;
-    mc->ss.srr0 += 4;
-    mc->fs.fpscr = 0x80|0x40|0x10;
-#elif defined(__FreeBSD__) && defined(__x86_64__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    struct savefpu *savefpu = (struct savefpu*)&mc->mc_fpstate;
-    struct envxmm *envxmm = &savefpu->sv_env;
-    pc = mc_pc(mc);
-    envxmm->en_mxcsr = 0x1F80;
-    envxmm->en_sw &= ~0xFF;
-#elif defined(__FreeBSD__) && defined(__i386__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    union savefpu *savefpu = (union savefpu*)&mc->mc_fpstate;
-    pc = mc_pc(mc);
-    if (mc->mc_fpformat == _MC_FPFMT_XMM) {
-	struct envxmm *envxmm = &savefpu->sv_xmm.sv_env;
-	envxmm->en_mxcsr = 0x1F80;
-	envxmm->en_sw &= ~0xFF;
-    } else {
-	struct env87 *env87 = &savefpu->sv_87.sv_env;
-	env87->en_sw &= ~0xFF;
-    }
-#elif defined(__NetBSD__) && defined(__x86_64__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    struct fxsave64 *fxsave = (struct fxsave64 *)&mc->__fpregs;
-    pc = mc_pc(mc);
-    fxsave->fx_mxcsr = 0x1F80;
-    fxsave->fx_fsw &= ~0xFF;
-#elif defined(__NetBSD__) && defined(__i386__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    pc = mc_pc(mc);
-    if (uc->uc_flags & _UC_FXSAVE) {
-	struct envxmm *envxmm = (struct envxmm *)&mc->__fpregs;
-	envxmm->en_mxcsr = 0x1F80;
-	envxmm->en_sw &= ~0xFF;
-    } else {
-	struct env87 *env87 = (struct env87 *)&mc->__fpregs;
-	env87->en_sw &= ~0xFF;
-    }
-#elif defined(__OpenBSD__) && defined(__x86_64__)
-    struct fxsave64 *fxsave = uc->sc_fpstate;
-    pc = mc_pc(uc);
-    fxsave->fx_mxcsr = 0x1F80;
-    fxsave->fx_fsw &= ~0xFF;
-#elif defined(__sun__) && defined(__x86_64__)
-    mcontext_t *mc = &uc->uc_mcontext;
-    struct fpchip_state *fpstate = &mc->fpregs.fp_reg_set.fpchip_state;
-    pc = mc_pc(mc);
-    fpstate->mxcsr = 0x1F80;
-    fpstate->sw &= ~0xFF;
-#endif
-#if 0
-    {
-	char buf[64];
-	snprintf(buf, sizeof buf, "%s: FPE at %p\r\n", __FUNCTION__, (void*)pc);
-	write(2, buf, strlen(buf));
-    }
-#endif
-    set_current_fp_exception(pc);
-}
-
-static void erts_thread_catch_fp_exceptions(void)
-{
-    struct sigaction act;
-    memset(&act, 0, sizeof act);
-    act.sa_sigaction = fpe_sig_action;
-    act.sa_flags = SA_SIGINFO;
-    sigaction(SIGFPE, &act, NULL);
-    unmask_fpe();
-}
-
-#else  /* !((__linux__ && (__i386__ || __x86_64__ || __powerpc__)) || (__DARWIN__ && (__i386__ || __x86_64__ || __ppc__))) */
-
-static void fpe_sig_handler(int sig)
-{
-    set_current_fp_exception(1); /* XXX: convert to sigaction so we can get the trap PC */
-}
-
-static void erts_thread_catch_fp_exceptions(void)
-{
-    sys_sigset(SIGFPE, fpe_sig_handler);
-    unmask_fpe();
-}
-
-#endif /* (__linux__ && (__i386__ || __x86_64__ || __powerpc__)) || (__DARWIN__ && (__i386__ || __x86_64__ || __ppc__))) */
-
-/* once-only initialisation early in the main thread */
-void erts_sys_init_float(void)
-{
-    erts_init_fp_exception();
-    erts_thread_catch_fp_exceptions();
-    erts_printf_block_fpe = erts_sys_block_fpe;
-    erts_printf_unblock_fpe = erts_sys_unblock_fpe;
-}
-
-#endif /* NO_FPE_SIGNALS */
-
-void erts_thread_init_float(void)
-{
-#ifdef ERTS_SMP
-    /* This allows Erlang schedulers to leave Erlang-process context
-       and still have working FP exceptions. XXX: is this needed? */
-    erts_thread_init_fp_exception();
-#endif
-
-#ifndef NO_FPE_SIGNALS
-    /* NOTE:
-     *  erts_thread_disable_fpe() is called in all threads at
-     *  creation. We at least need to call unmask_fpe()
-     */
-#if defined(__DARWIN__) || defined(__FreeBSD__)
-    /* Darwin (7.9.0) does not appear to propagate FP exception settings
-       to a new thread from its parent. So if we want FP exceptions, we
-       must manually re-enable them in each new thread.
-       FreeBSD 6.1 appears to suffer from a similar issue. */
-    erts_thread_catch_fp_exceptions();
-#else
-    unmask_fpe();
-#endif
-
-#endif
-}
-
-void erts_thread_disable_fpe(void)
-{
-#if !defined(NO_FPE_SIGNALS)
-    (void)mask_fpe();
-#endif
-}
-
-#if !defined(NO_FPE_SIGNALS)
-int erts_sys_block_fpe(void)
-{
-    return mask_fpe();
-}
-
-void erts_sys_unblock_fpe(int unmasked)
-{
-    unmask_fpe_conditional(unmasked);
-}
-#endif
-
-/* The following check is incorporated from the Vee machine */
-
-#define ISDIGIT(d) ((d) >= '0' && (d) <= '9')
-
-/*
- ** Convert a double to ascii format 0.dddde[+|-]ddd
- ** return number of characters converted or -1 if error.
- **
- ** These two functions should maybe use localeconv() to pick up
- ** the current radix character, but since it is uncertain how
- ** expensive such a system call is, and since no-one has heard
- ** of other radix characters than '.' and ',' an ad-hoc
- ** low execution time solution is used instead.
- */
-
-int
-sys_double_to_chars_ext(double fp, char *buffer, size_t buffer_size, size_t decimals)
-{
-    char *s = buffer;
-
-    if (erts_snprintf(buffer, buffer_size, "%.*e", decimals, fp) >= buffer_size)
-        return -1;
-    /* Search upto decimal point */
-    if (*s == '+' || *s == '-') s++;
-    while (ISDIGIT(*s)) s++;
-    if (*s == ',') *s++ = '.'; /* Replace ',' with '.' */
-    /* Scan to end of string */
-    while (*s) s++;
-    return s-buffer; /* i.e strlen(buffer) */
-}
-
-/* Float conversion */
-
-int
-sys_chars_to_double(char* buf, double* fp)
-{
-#ifndef NO_FPE_SIGNALS
-    volatile unsigned long *fpexnp = erts_get_current_fp_exception();
-#endif
-    char *s = buf, *t, *dp;
-
-    /* Robert says that something like this is what he really wanted:
-     * (The [.,] radix test is NOT what Robert wanted - it was added later)
-     *
-     * 7 == sscanf(Tbuf, "%[+-]%[0-9][.,]%[0-9]%[eE]%[+-]%[0-9]%s", ....);
-     * if (*s2 == 0 || *s3 == 0 || *s4 == 0 || *s6 == 0 || *s7)
-     *   break;
-     */
-
-    /* Scan string to check syntax. */
-    if (*s == '+' || *s == '-') s++;
-    if (!ISDIGIT(*s))		/* Leading digits. */
-      return -1;
-    while (ISDIGIT(*s)) s++;
-    if (*s != '.' && *s != ',')	/* Decimal part. */
-      return -1;
-    dp = s++;			/* Remember decimal point pos just in case */
-    if (!ISDIGIT(*s))
-      return -1;
-    while (ISDIGIT(*s)) s++;
-    if (*s == 'e' || *s == 'E') {
-	/* There is an exponent. */
-	s++;
-	if (*s == '+' || *s == '-') s++;
-	if (!ISDIGIT(*s))
-	  return -1;
-	while (ISDIGIT(*s)) s++;
-    }
-    if (*s)			/* That should be it */
-      return -1;
-
-#ifdef NO_FPE_SIGNALS
-    errno = 0;
-#endif
-    __ERTS_FP_CHECK_INIT(fpexnp);
-    *fp = strtod(buf, &t);
-    __ERTS_FP_ERROR_THOROUGH(fpexnp, *fp, return -1);
-    if (t != s) {		/* Whole string not scanned */
-	/* Try again with other radix char */
-	*dp = (*dp == '.') ? ',' : '.';
-	errno = 0;
-	__ERTS_FP_CHECK_INIT(fpexnp);
-	*fp = strtod(buf, &t);
-	__ERTS_FP_ERROR_THOROUGH(fpexnp, *fp, return -1);
-    }
-
-#ifdef NO_FPE_SIGNALS
-    if (errno == ERANGE) {
-	if (*fp == HUGE_VAL || *fp == -HUGE_VAL) {
-	    /* overflow, should give error */
-	    return -1;
-	} else if (t == s && *fp == 0.0) {
-	    /* This should give 0.0 - OTP-7178 */
-	    errno = 0;
-
-	} else if (*fp == 0.0) {
-	    return -1;
-	}
-    }
-#endif
-    return 0;
-}
-
-int
-matherr(struct exception *exc)
-{
-#if !defined(NO_FPE_SIGNALS)
-    volatile unsigned long *fpexnp = erts_get_current_fp_exception();
-    if (fpexnp != NULL)
-	*fpexnp = (unsigned long)__builtin_return_address(0);
-#endif
-    return 1;
-}
diff --git a/erts/emulator/sys/ose/sys_time.c b/erts/emulator/sys/ose/sys_time.c
deleted file mode 100644
index 5dac75956a..0000000000
--- a/erts/emulator/sys/ose/sys_time.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2005-2009. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-
-#include "sys.h"
-#include "global.h"
-
-/******************* Routines for time measurement *********************/
-
-int erts_ticks_per_sec = 0; /* Will be SYS_CLK_TCK in erl_unix_sys.h */
-
-int sys_init_time(void)
-{
-  return SYS_CLOCK_RESOLUTION;
-}
-
-clock_t sys_times(SysTimes *now) {
-  now->tms_utime = now->tms_stime = now->tms_cutime =  now->tms_cstime = 0;
-  return 0;
-}
-
-static OSTICK last_tick_count = 0;
-static SysHrTime wrap = 0;
-static OSTICK us_per_tick;
-
-void sys_init_hrtime() {
-  us_per_tick = system_tick();
-}
-
-SysHrTime sys_gethrtime() {
-  OSTICK ticks = get_ticks();
-  if (ticks < (SysHrTime) last_tick_count) {
-    wrap += 1ULL << 32;
-  }
-  last_tick_count = ticks;
-  return ((((SysHrTime) ticks) + wrap) * 1000*us_per_tick);
-}
-- 
cgit v1.2.3


From 997881b9046d3468685c545dc917e8204e0a9ef6 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Thu, 3 Sep 2015 17:57:30 +0200
Subject: erts: Remove unused erts_have_erts_mmap

---
 erts/emulator/sys/common/erl_mmap.c | 6 ------
 erts/emulator/sys/common/erl_mmap.h | 3 ---
 2 files changed, 9 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_mmap.c b/erts/emulator/sys/common/erl_mmap.c
index e6d0e1e281..eeaf96dd93 100644
--- a/erts/emulator/sys/common/erl_mmap.c
+++ b/erts/emulator/sys/common/erl_mmap.c
@@ -67,7 +67,6 @@
      (((UWord) (PTR)) - ((UWord) mmap_state.sua.bot)			\
       < ((UWord) mmap_state.sua.top) - ((UWord) mmap_state.sua.bot)))
 
-int erts_have_erts_mmap;
 UWord erts_page_inv_mask;
 
 #if defined(DEBUG) || defined(ERTS_MMAP_DEBUG)
@@ -2131,8 +2130,6 @@ erts_mmap_init(ErtsMMapInit *init)
 
     ERTS_MMAP_OP_RINGBUF_INIT();
 
-    erts_have_erts_mmap = 0;
-
     mmap_state.supercarrier = 0;
     mmap_state.reserve_physical = reserve_noop;
     mmap_state.unreserve_physical = unreserve_noop;
@@ -2206,8 +2203,6 @@ erts_mmap_init(ErtsMMapInit *init)
 	}
 #endif
     }
-    if (!mmap_state.no_os_mmap)
-	erts_have_erts_mmap |= ERTS_HAVE_ERTS_OS_MMAP;
 #endif
 
     mmap_state.no.free_seg_descs = 0;
@@ -2291,7 +2286,6 @@ erts_mmap_init(ErtsMMapInit *init)
 	init_free_seg_map(&mmap_state.sua.map, SZ_REVERSE_ADDR_ORDER);
 
 	mmap_state.supercarrier = 1;
-	erts_have_erts_mmap |= ERTS_HAVE_ERTS_SUPERCARRIER_MMAP;
 
 	mmap_state.desc.new_area_hint = end;
 
diff --git a/erts/emulator/sys/common/erl_mmap.h b/erts/emulator/sys/common/erl_mmap.h
index 66619c5161..51f830d045 100644
--- a/erts/emulator/sys/common/erl_mmap.h
+++ b/erts/emulator/sys/common/erl_mmap.h
@@ -30,9 +30,6 @@
 #define ERTS_MMAPFLG_SUPERCARRIER_ONLY		(((Uint32) 1) << 1)
 #define ERTS_MMAPFLG_SUPERALIGNED		(((Uint32) 1) << 2)
 
-#define ERTS_HAVE_ERTS_OS_MMAP			(1 << 0)
-#define ERTS_HAVE_ERTS_SUPERCARRIER_MMAP	(1 << 1)
-extern int erts_have_erts_mmap;
 extern UWord erts_page_inv_mask;
 
 typedef struct {
-- 
cgit v1.2.3


From 1fd4809777931a4dc166fd9f1b552317a385cd62 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Mon, 7 Sep 2015 19:58:47 +0200
Subject: erts: Fix strangeness in treatment of MSEG_ALIGN_BITS

And remove old case of using only page alignment (12 bits).
---
 erts/emulator/sys/common/erl_mseg.h | 10 ----------
 1 file changed, 10 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_mseg.h b/erts/emulator/sys/common/erl_mseg.h
index 656484702d..677f8ea4ed 100644
--- a/erts/emulator/sys/common/erl_mseg.h
+++ b/erts/emulator/sys/common/erl_mseg.h
@@ -42,16 +42,6 @@
 
 #if ERTS_HAVE_MSEG_SUPER_ALIGNED
 #  define MSEG_ALIGN_BITS ERTS_MMAP_SUPERALIGNED_BITS
-#else
-/* If we don't use super aligned multiblock carriers
- * we will mmap with page size alignment (and thus use corresponding
- * align bits).
- *
- * Current implementation needs this to be a constant and
- * only uses this for user dev testing so setting page size
- * to 4096 (12 bits) is fine.
- */
-#  define MSEG_ALIGN_BITS       (12)
 #endif
 
 #if HAVE_ERTS_MSEG
-- 
cgit v1.2.3


From 63466c5522ed58b6e73e35dc29c7c7584f073768 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Wed, 2 Sep 2015 18:35:29 +0200
Subject: erts: Refactor erl_mmap to allow several mapper instances

---
 erts/emulator/sys/common/erl_mmap.c | 550 ++++++++++++++++++------------------
 erts/emulator/sys/common/erl_mmap.h |  19 +-
 erts/emulator/sys/common/erl_mseg.c |  11 +-
 3 files changed, 295 insertions(+), 285 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_mmap.c b/erts/emulator/sys/common/erl_mmap.c
index eeaf96dd93..e8ff2bf752 100644
--- a/erts/emulator/sys/common/erl_mmap.c
+++ b/erts/emulator/sys/common/erl_mmap.c
@@ -51,21 +51,21 @@
 #endif
 
 /*
- * `mmap_state.sa.bot` and `mmap_state.sua.top` are read only after
+ * `mm->sa.bot` and `mm->sua.top` are read only after
  * initialization, but the other pointers are not; i.e., only
  * ERTS_MMAP_IN_SUPERCARRIER() is allowed without the mutex held.
  */
 #define ERTS_MMAP_IN_SUPERCARRIER(PTR)					\
-    (((UWord) (PTR)) - ((UWord) mmap_state.sa.bot)			\
-     < ((UWord) mmap_state.sua.top) - ((UWord) mmap_state.sa.bot))
+    (((UWord) (PTR)) - ((UWord) mm->sa.bot)			\
+     < ((UWord) mm->sua.top) - ((UWord) mm->sa.bot))
 #define ERTS_MMAP_IN_SUPERALIGNED_AREA(PTR)				\
-    (ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&mmap_state.mtx)),	\
-     (((UWord) (PTR)) - ((UWord) mmap_state.sa.bot)			\
-      < ((UWord) mmap_state.sa.top) - ((UWord) mmap_state.sa.bot)))
+    (ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&mm->mtx)),	\
+     (((UWord) (PTR)) - ((UWord) mm->sa.bot)			\
+      < ((UWord) mm->sa.top) - ((UWord) mm->sa.bot)))
 #define ERTS_MMAP_IN_SUPERUNALIGNED_AREA(PTR)				\
-    (ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&mmap_state.mtx)),	\
-     (((UWord) (PTR)) - ((UWord) mmap_state.sua.bot)			\
-      < ((UWord) mmap_state.sua.top) - ((UWord) mmap_state.sua.bot)))
+    (ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&mm->mtx)),	\
+     (((UWord) (PTR)) - ((UWord) mm->sua.bot)			\
+      < ((UWord) mm->sua.top) - ((UWord) mm->sua.bot)))
 
 UWord erts_page_inv_mask;
 
@@ -196,10 +196,10 @@ static ErtsMMapOp mmap_ops[ERTS_MMAP_OP_RINGBUF_SZ];
 
 #define ERTS_MMAP_OP_LCK(RES, IN_SZ, OUT_SZ)			\
     do {							\
-	erts_smp_mtx_lock(&mmap_state.mtx);			\
+	erts_smp_mtx_lock(&mm->mtx);			\
 	ERTS_MMAP_OP_START((IN_SZ));				\
 	ERTS_MMAP_OP_END((RES), (OUT_SZ));			\
-	erts_smp_mtx_unlock(&mmap_state.mtx);			\
+	erts_smp_mtx_unlock(&mm->mtx);			\
     } while (0)
 
 #define ERTS_MUNMAP_OP(PTR, SZ)					\
@@ -218,9 +218,9 @@ static ErtsMMapOp mmap_ops[ERTS_MMAP_OP_RINGBUF_SZ];
 
 #define ERTS_MUNMAP_OP_LCK(PTR, SZ)				\
     do {							\
-	erts_smp_mtx_lock(&mmap_state.mtx);			\
+	erts_smp_mtx_lock(&mm->mtx);			\
 	ERTS_MUNMAP_OP((PTR), (SZ));				\
-	erts_smp_mtx_unlock(&mmap_state.mtx);			\
+	erts_smp_mtx_unlock(&mm->mtx);			\
     } while (0)
 
 #define ERTS_MREMAP_OP_START(OLD_PTR, OLD_SZ, IN_SZ)		\
@@ -246,10 +246,10 @@ static ErtsMMapOp mmap_ops[ERTS_MMAP_OP_RINGBUF_SZ];
 
 #define ERTS_MREMAP_OP_LCK(RES, OLD_PTR, OLD_SZ, IN_SZ, OUT_SZ)	\
     do {							\
-	erts_smp_mtx_lock(&mmap_state.mtx);			\
+	erts_smp_mtx_lock(&mm->mtx);			\
 	ERTS_MREMAP_OP_START((OLD_PTR), (OLD_SZ), (IN_SZ));	\
 	ERTS_MREMAP_OP_END((RES), (OUT_SZ));			\
-	erts_smp_mtx_unlock(&mmap_state.mtx);			\
+	erts_smp_mtx_unlock(&mm->mtx);			\
     } while (0)
 
 #define ERTS_MMAP_OP_ABORT()					\
@@ -293,7 +293,7 @@ typedef struct {
     Uint nseg;
 }ErtsFreeSegMap;
 
-static struct {
+struct ErtsMemMapper_ {
     int (*reserve_physical)(char *, UWord);
     void (*unreserve_physical)(char *, UWord);
     int supercarrier;
@@ -345,54 +345,56 @@ static struct {
 	    UWord used;
 	} os;
     } size;
-} mmap_state;
+};
+
+ErtsMemMapper erts_dflt_mmapper;
 
 #define ERTS_MMAP_SIZE_SC_SA_INC(SZ) 						\
     do {									\
-	mmap_state.size.supercarrier.used.total += (SZ);			\
-	mmap_state.size.supercarrier.used.sa += (SZ);				\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total		\
-			 <= mmap_state.size.supercarrier.total);		\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sa			\
-			 <= mmap_state.size.supercarrier.used.total);		\
+	mm->size.supercarrier.used.total += (SZ);			\
+	mm->size.supercarrier.used.sa += (SZ);				\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.total		\
+			 <= mm->size.supercarrier.total);		\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.sa			\
+			 <= mm->size.supercarrier.used.total);		\
     } while (0)
 #define ERTS_MMAP_SIZE_SC_SA_DEC(SZ) 						\
     do {									\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total >= (SZ));	\
-	mmap_state.size.supercarrier.used.total -= (SZ);			\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sa >= (SZ));		\
-	mmap_state.size.supercarrier.used.sa -= (SZ);				\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.total >= (SZ));	\
+	mm->size.supercarrier.used.total -= (SZ);			\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.sa >= (SZ));		\
+	mm->size.supercarrier.used.sa -= (SZ);				\
     } while (0)
 #define ERTS_MMAP_SIZE_SC_SUA_INC(SZ) 						\
     do {									\
-	mmap_state.size.supercarrier.used.total += (SZ);			\
-	mmap_state.size.supercarrier.used.sua += (SZ);				\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total		\
-			 <= mmap_state.size.supercarrier.total);		\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sua			\
-			 <= mmap_state.size.supercarrier.used.total);		\
+	mm->size.supercarrier.used.total += (SZ);			\
+	mm->size.supercarrier.used.sua += (SZ);				\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.total		\
+			 <= mm->size.supercarrier.total);		\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.sua			\
+			 <= mm->size.supercarrier.used.total);		\
     } while (0)
 #define ERTS_MMAP_SIZE_SC_SUA_DEC(SZ) 						\
     do {									\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total >= (SZ));	\
-	mmap_state.size.supercarrier.used.total -= (SZ);			\
-	ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sua >= (SZ));	\
-	mmap_state.size.supercarrier.used.sua -= (SZ);				\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.total >= (SZ));	\
+	mm->size.supercarrier.used.total -= (SZ);			\
+	ERTS_MMAP_ASSERT(mm->size.supercarrier.used.sua >= (SZ));	\
+	mm->size.supercarrier.used.sua -= (SZ);				\
     } while (0)
 #define ERTS_MMAP_SIZE_OS_INC(SZ)						\
     do {									\
-	ERTS_MMAP_ASSERT(mmap_state.size.os.used + (SZ) >= (SZ));		\
-	mmap_state.size.os.used += (SZ);					\
+	ERTS_MMAP_ASSERT(mm->size.os.used + (SZ) >= (SZ));		\
+	mm->size.os.used += (SZ);					\
     } while (0)
 #define ERTS_MMAP_SIZE_OS_DEC(SZ) 						\
     do {									\
-	ERTS_MMAP_ASSERT(mmap_state.size.os.used >= (SZ));			\
-	mmap_state.size.os.used -= (SZ);					\
+	ERTS_MMAP_ASSERT(mm->size.os.used >= (SZ));			\
+	mm->size.os.used -= (SZ);					\
     } while (0)
 
 
 static void
-add_free_desc_area(char *start, char *end)
+add_free_desc_area(ErtsMemMapper* mm, char *start, char *end)
 {
     ERTS_MMAP_ASSERT(end == (void *) 0 || end > start);
     if (sizeof(ErtsFreeSegDesc) <= ((UWord) end) - ((UWord) start)) {
@@ -402,7 +404,7 @@ add_free_desc_area(char *start, char *end)
 
 	no = 1;
 	prev_desc = (ErtsFreeSegDesc *) start;
-	prev_desc->start = mmap_state.desc.free_list;
+	prev_desc->start = mm->desc.free_list;
 	desc = (ErtsFreeSegDesc *) (start + sizeof(ErtsFreeSegDesc));
 	desc_end = start + 2*sizeof(ErtsFreeSegDesc);
 
@@ -413,59 +415,59 @@ add_free_desc_area(char *start, char *end)
 	    desc_end += sizeof(ErtsFreeSegDesc);
 	    no++;
 	}
-	mmap_state.desc.free_list = (char *) prev_desc;
-	mmap_state.no.free_seg_descs += no;
+	mm->desc.free_list = (char *) prev_desc;
+	mm->no.free_seg_descs += no;
     }
 }
 
 static ErtsFreeSegDesc *
-add_unused_free_desc_area(void)
+add_unused_free_desc_area(ErtsMemMapper* mm)
 {
     char *ptr;
-    if (!mmap_state.desc.unused_start)
+    if (!mm->desc.unused_start)
 	return NULL;
 
-    ERTS_MMAP_ASSERT(mmap_state.desc.unused_end);
+    ERTS_MMAP_ASSERT(mm->desc.unused_end);
     ERTS_MMAP_ASSERT(ERTS_PAGEALIGNED_SIZE
-		     <= mmap_state.desc.unused_end - mmap_state.desc.unused_start);
+		     <= mm->desc.unused_end - mm->desc.unused_start);
 
-    ptr = mmap_state.desc.unused_start + ERTS_PAGEALIGNED_SIZE;
-    add_free_desc_area(mmap_state.desc.unused_start, ptr);
+    ptr = mm->desc.unused_start + ERTS_PAGEALIGNED_SIZE;
+    add_free_desc_area(mm, mm->desc.unused_start, ptr);
 
-    if ((mmap_state.desc.unused_end - ptr) >= ERTS_PAGEALIGNED_SIZE)
-	mmap_state.desc.unused_start = ptr;
+    if ((mm->desc.unused_end - ptr) >= ERTS_PAGEALIGNED_SIZE)
+	mm->desc.unused_start = ptr;
     else
-	mmap_state.desc.unused_end = mmap_state.desc.unused_start = NULL;
+	mm->desc.unused_end = mm->desc.unused_start = NULL;
 
-    ERTS_MMAP_ASSERT(mmap_state.desc.free_list);
-    return (ErtsFreeSegDesc *) mmap_state.desc.free_list;
+    ERTS_MMAP_ASSERT(mm->desc.free_list);
+    return (ErtsFreeSegDesc *) mm->desc.free_list;
 }
 
 static ERTS_INLINE ErtsFreeSegDesc *
-alloc_desc(void)
+alloc_desc(ErtsMemMapper* mm)
 {
     ErtsFreeSegDesc *res;
-    res = (ErtsFreeSegDesc *) mmap_state.desc.free_list;
+    res = (ErtsFreeSegDesc *) mm->desc.free_list;
     if (!res) {
-	res = add_unused_free_desc_area();
+	res = add_unused_free_desc_area(mm);
 	if (!res)
 	    return NULL;
     }
-    mmap_state.desc.free_list = res->start;
-    ASSERT(mmap_state.no.free_segs.curr < mmap_state.no.free_seg_descs);
-    mmap_state.no.free_segs.curr++;
-    if (mmap_state.no.free_segs.max < mmap_state.no.free_segs.curr)
-	mmap_state.no.free_segs.max = mmap_state.no.free_segs.curr;
+    mm->desc.free_list = res->start;
+    ASSERT(mm->no.free_segs.curr < mm->no.free_seg_descs);
+    mm->no.free_segs.curr++;
+    if (mm->no.free_segs.max < mm->no.free_segs.curr)
+	mm->no.free_segs.max = mm->no.free_segs.curr;
     return res;
 }
 
 static ERTS_INLINE void
-free_desc(ErtsFreeSegDesc *desc)
+free_desc(ErtsMemMapper* mm, ErtsFreeSegDesc *desc)
 {
-    desc->start = mmap_state.desc.free_list;
-    mmap_state.desc.free_list = (char *) desc;
-    ERTS_MMAP_ASSERT(mmap_state.no.free_segs.curr > 0);
-    mmap_state.no.free_segs.curr--;
+    desc->start = mm->desc.free_list;
+    mm->desc.free_list = (char *) desc;
+    ERTS_MMAP_ASSERT(mm->no.free_segs.curr > 0);
+    mm->no.free_segs.curr--;
 }
 
 static ERTS_INLINE ErtsFreeSegDesc* anode_to_desc(RBTNode* anode)
@@ -1232,7 +1234,7 @@ Eterm build_free_seg_list(Process* p, ErtsFreeSegMap* map)
 #    define ERTS_MMAP_FD		(-1)
 #  else
 #    define ERTS_MMAP_FLAGS		(MAP_PRIVATE)
-#    define ERTS_MMAP_FD		mmap_state.mmap_fd
+#    define ERTS_MMAP_FD		mm->mmap_fd
 #  endif
 #endif
 
@@ -1377,11 +1379,12 @@ static void unreserve_noop(char *ptr, UWord size)
 }
 
 static UWord
-alloc_desc_insert_free_seg(ErtsFreeSegMap *map, char* start, char* end)
+alloc_desc_insert_free_seg(ErtsMemMapper* mm,
+                           ErtsFreeSegMap *map, char* start, char* end)
 {
     char *ptr;
     ErtsFreeSegMap *da_map;
-    ErtsFreeSegDesc *desc = alloc_desc();
+    ErtsFreeSegDesc *desc = alloc_desc(mm);
     if (desc) {
 	insert_free_seg(map, desc, start, end);
 	return 0;
@@ -1394,13 +1397,13 @@ alloc_desc_insert_free_seg(ErtsFreeSegMap *map, char* start, char* end)
      */
 
 #if ERTS_HAVE_OS_MMAP
-    if (!mmap_state.no_os_mmap) {
-        ptr = os_mmap(mmap_state.desc.new_area_hint, ERTS_PAGEALIGNED_SIZE, 0);
+    if (!mm->no_os_mmap) {
+        ptr = os_mmap(mm->desc.new_area_hint, ERTS_PAGEALIGNED_SIZE, 0);
         if (ptr) {
-            mmap_state.desc.new_area_hint = ptr+ERTS_PAGEALIGNED_SIZE;
+            mm->desc.new_area_hint = ptr+ERTS_PAGEALIGNED_SIZE;
             ERTS_MMAP_SIZE_OS_INC(ERTS_PAGEALIGNED_SIZE);
-            add_free_desc_area(ptr, ptr+ERTS_PAGEALIGNED_SIZE);
-            desc = alloc_desc();
+            add_free_desc_area(mm, ptr, ptr+ERTS_PAGEALIGNED_SIZE);
+            desc = alloc_desc(mm);
             ERTS_MMAP_ASSERT(desc);
             insert_free_seg(map, desc, start, end);
             return 0;
@@ -1411,20 +1414,20 @@ alloc_desc_insert_free_seg(ErtsFreeSegMap *map, char* start, char* end)
     /*
      * ...then try to find a good place in the supercarrier...
      */
-    da_map = &mmap_state.sua.map;
+    da_map = &mm->sua.map;
     desc = lookup_free_seg(da_map, ERTS_PAGEALIGNED_SIZE);
     if (desc) {
-	if (mmap_state.reserve_physical(desc->start, ERTS_PAGEALIGNED_SIZE))
+	if (mm->reserve_physical(desc->start, ERTS_PAGEALIGNED_SIZE))
 	    ERTS_MMAP_SIZE_SC_SUA_INC(ERTS_PAGEALIGNED_SIZE);
 	else
 	    desc = NULL;
 	
     }
     else {
-	da_map = &mmap_state.sa.map;
+	da_map = &mm->sa.map;
 	desc = lookup_free_seg(da_map, ERTS_PAGEALIGNED_SIZE);
 	if (desc) {
-	    if (mmap_state.reserve_physical(desc->start, ERTS_PAGEALIGNED_SIZE))
+	    if (mm->reserve_physical(desc->start, ERTS_PAGEALIGNED_SIZE))
 		ERTS_MMAP_SIZE_SC_SA_INC(ERTS_PAGEALIGNED_SIZE);
 	    else
 		desc = NULL;
@@ -1432,15 +1435,15 @@ alloc_desc_insert_free_seg(ErtsFreeSegMap *map, char* start, char* end)
     }
     if (desc) {
 	char *da_end = desc->start + ERTS_PAGEALIGNED_SIZE;
-	add_free_desc_area(desc->start, da_end);
+	add_free_desc_area(mm, desc->start, da_end);
 	if (da_end != desc->end)
 	    resize_free_seg(da_map, desc, da_end, desc->end);
 	else {
 	    delete_free_seg(da_map, desc);
-	    free_desc(desc);
+	    free_desc(mm, desc);
 	}
 
-	desc = alloc_desc();
+	desc = alloc_desc(mm);
 	ERTS_MMAP_ASSERT(desc);
 	insert_free_seg(map, desc, start, end);
 	return 0;
@@ -1453,10 +1456,10 @@ alloc_desc_insert_free_seg(ErtsFreeSegMap *map, char* start, char* end)
     ptr = start + ERTS_PAGEALIGNED_SIZE;
     ERTS_MMAP_ASSERT(ptr <= end);
 
-    add_free_desc_area(start, ptr);
+    add_free_desc_area(mm, start, ptr);
 
     if (ptr != end) {
-	desc = alloc_desc();
+	desc = alloc_desc(mm);
 	ERTS_MMAP_ASSERT(desc);
 	insert_free_seg(map, desc, ptr, end);
     }
@@ -1465,46 +1468,46 @@ alloc_desc_insert_free_seg(ErtsFreeSegMap *map, char* start, char* end)
 }
 
 void *
-erts_mmap(Uint32 flags, UWord *sizep)
+erts_mmap(ErtsMemMapper* mm, Uint32 flags, UWord *sizep)
 {
     char *seg;
     UWord asize = ERTS_PAGEALIGNED_CEILING(*sizep);
 
     /* Map in premapped supercarrier */
-    if (mmap_state.supercarrier && !(ERTS_MMAPFLG_OS_ONLY & flags)) {
+    if (mm->supercarrier && !(ERTS_MMAPFLG_OS_ONLY & flags)) {
 	char *end;
 	ErtsFreeSegDesc *desc;
 	Uint32 superaligned = (ERTS_MMAPFLG_SUPERALIGNED & flags);
 
-	erts_smp_mtx_lock(&mmap_state.mtx);
+	erts_smp_mtx_lock(&mm->mtx);
 
 	ERTS_MMAP_OP_START(*sizep);
 
 	if (!superaligned) {
-	    desc = lookup_free_seg(&mmap_state.sua.map, asize);
+	    desc = lookup_free_seg(&mm->sua.map, asize);
 	    if (desc) {
 		seg = desc->start;
 		end = seg+asize;
-		if (!mmap_state.reserve_physical(seg, asize))
+		if (!mm->reserve_physical(seg, asize))
 		    goto supercarrier_reserve_failure;
 		if (desc->end == end) {
-		    delete_free_seg(&mmap_state.sua.map, desc);
-		    free_desc(desc);
+		    delete_free_seg(&mm->sua.map, desc);
+		    free_desc(mm, desc);
 		}
 		else {
 		    ERTS_MMAP_ASSERT(end < desc->end);
-		    resize_free_seg(&mmap_state.sua.map, desc, end, desc->end);
+		    resize_free_seg(&mm->sua.map, desc, end, desc->end);
 		}
 		ERTS_MMAP_SIZE_SC_SUA_INC(asize);
 		goto supercarrier_success;
 	    }
 
-	    if (asize <= mmap_state.sua.bot - mmap_state.sa.top) {
-		if (!mmap_state.reserve_physical(mmap_state.sua.bot - asize,
+	    if (asize <= mm->sua.bot - mm->sa.top) {
+		if (!mm->reserve_physical(mm->sua.bot - asize,
 						 asize))
 		    goto supercarrier_reserve_failure;
-		mmap_state.sua.bot -= asize;
-		seg = mmap_state.sua.bot;
+		mm->sua.bot -= asize;
+		seg = mm->sua.bot;
 		ERTS_MMAP_SIZE_SC_SUA_INC(asize);
 		goto supercarrier_success;
 	    }
@@ -1512,84 +1515,84 @@ erts_mmap(Uint32 flags, UWord *sizep)
 
 	asize = ERTS_SUPERALIGNED_CEILING(asize);
 
-	desc = lookup_free_seg(&mmap_state.sa.map, asize);
+	desc = lookup_free_seg(&mm->sa.map, asize);
 	if (desc) {
 	    char *start = seg = desc->start;
 	    seg = (char *) ERTS_SUPERALIGNED_CEILING(seg);
 	    end = seg+asize;
-	    if (!mmap_state.reserve_physical(start, (UWord) (end - start)))
+	    if (!mm->reserve_physical(start, (UWord) (end - start)))
 		goto supercarrier_reserve_failure;
 	    ERTS_MMAP_SIZE_SC_SA_INC(asize);
 	    if (desc->end == end) {
 		if (start != seg)
-		    resize_free_seg(&mmap_state.sa.map, desc, start, seg);
+		    resize_free_seg(&mm->sa.map, desc, start, seg);
 		else {
-		    delete_free_seg(&mmap_state.sa.map, desc);
-		    free_desc(desc);
+		    delete_free_seg(&mm->sa.map, desc);
+		    free_desc(mm, desc);
 		}
 	    }
 	    else {
 		ERTS_MMAP_ASSERT(end < desc->end);
-		resize_free_seg(&mmap_state.sa.map, desc, end, desc->end);
+		resize_free_seg(&mm->sa.map, desc, end, desc->end);
 		if (start != seg) {
 		    UWord ad_sz;
-		    ad_sz = alloc_desc_insert_free_seg(&mmap_state.sua.map,
+		    ad_sz = alloc_desc_insert_free_seg(mm, &mm->sua.map,
 						       start, seg);
 		    start += ad_sz;
 		    if (start != seg)
-			mmap_state.unreserve_physical(start, (UWord) (seg - start));
+			mm->unreserve_physical(start, (UWord) (seg - start));
 		}
 	    }
 	    goto supercarrier_success;
 	}
 
 	if (superaligned) {
-	    char *start = mmap_state.sa.top;
+	    char *start = mm->sa.top;
 	    seg = (char *) ERTS_SUPERALIGNED_CEILING(start);
 
-	    if (asize + (seg - start) <= mmap_state.sua.bot - start) {
+	    if (asize + (seg - start) <= mm->sua.bot - start) {
 		end = seg + asize;
-		if (!mmap_state.reserve_physical(start, (UWord) (end - start)))
+		if (!mm->reserve_physical(start, (UWord) (end - start)))
 		    goto supercarrier_reserve_failure;
-		mmap_state.sa.top = end;
+		mm->sa.top = end;
 		ERTS_MMAP_SIZE_SC_SA_INC(asize);
 		if (start != seg) {
 		    UWord ad_sz;
-		    ad_sz = alloc_desc_insert_free_seg(&mmap_state.sua.map,
+		    ad_sz = alloc_desc_insert_free_seg(mm, &mm->sua.map,
 						       start, seg);
 		    start += ad_sz;
 		    if (start != seg)
-			mmap_state.unreserve_physical(start, (UWord) (seg - start));
+			mm->unreserve_physical(start, (UWord) (seg - start));
 		}
 		goto supercarrier_success;
 	    }
 
-	    desc = lookup_free_seg(&mmap_state.sua.map, asize + ERTS_SUPERALIGNED_SIZE);
+	    desc = lookup_free_seg(&mm->sua.map, asize + ERTS_SUPERALIGNED_SIZE);
 	    if (desc) {
 		char *org_start = desc->start;
 		char *org_end = desc->end;
 
 		seg = (char *) ERTS_SUPERALIGNED_CEILING(org_start);
 		end = seg + asize;
-		if (!mmap_state.reserve_physical(seg, (UWord) (org_end - seg)))
+		if (!mm->reserve_physical(seg, (UWord) (org_end - seg)))
 		    goto supercarrier_reserve_failure;
 		ERTS_MMAP_SIZE_SC_SUA_INC(asize);
 		if (org_start != seg) {
 		    ERTS_MMAP_ASSERT(org_start < seg);
-		    resize_free_seg(&mmap_state.sua.map, desc, org_start, seg);
+		    resize_free_seg(&mm->sua.map, desc, org_start, seg);
 		    desc = NULL;
 		}
 		if (end != org_end) {
 		    UWord ad_sz = 0;
 		    ERTS_MMAP_ASSERT(end < org_end);
 		    if (desc)
-			resize_free_seg(&mmap_state.sua.map, desc, end, org_end);
+			resize_free_seg(&mm->sua.map, desc, end, org_end);
 		    else
-			ad_sz = alloc_desc_insert_free_seg(&mmap_state.sua.map,
+			ad_sz = alloc_desc_insert_free_seg(mm, &mm->sua.map,
 							   end, org_end);
 		    end += ad_sz;
 		    if (end != org_end)
-			mmap_state.unreserve_physical(end,
+			mm->unreserve_physical(end,
 						      (UWord) (org_end - end));
 		}
 		goto supercarrier_success;
@@ -1597,12 +1600,12 @@ erts_mmap(Uint32 flags, UWord *sizep)
 	}
 
 	ERTS_MMAP_OP_ABORT();
-	erts_smp_mtx_unlock(&mmap_state.mtx);
+	erts_smp_mtx_unlock(&mm->mtx);
     }
 
 #if ERTS_HAVE_OS_MMAP
     /* Map using OS primitives */
-    if (!(ERTS_MMAPFLG_SUPERCARRIER_ONLY & flags) && !mmap_state.no_os_mmap) {
+    if (!(ERTS_MMAPFLG_SUPERCARRIER_ONLY & flags) && !mm->no_os_mmap) {
 	if (!(ERTS_MMAPFLG_SUPERALIGNED & flags)) {
 	    seg = os_mmap(NULL, asize, 0);
 	    if (!seg)
@@ -1660,25 +1663,25 @@ supercarrier_success:
 #endif
 
     ERTS_MMAP_OP_END(seg, asize);
-    erts_smp_mtx_unlock(&mmap_state.mtx);
+    erts_smp_mtx_unlock(&mm->mtx);
 
     *sizep = asize;
     return (void *) seg;
 
 supercarrier_reserve_failure:
-    erts_smp_mtx_unlock(&mmap_state.mtx);
+    erts_smp_mtx_unlock(&mm->mtx);
     *sizep = 0;
     return NULL;
 }
 
 void
-erts_munmap(Uint32 flags, void *ptr, UWord size)
+erts_munmap(ErtsMemMapper* mm, Uint32 flags, void *ptr, UWord size)
 {
     ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(ptr));
     ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(size));
 
     if (!ERTS_MMAP_IN_SUPERCARRIER(ptr)) {
-	ERTS_MMAP_ASSERT(!mmap_state.no_os_mmap);
+	ERTS_MMAP_ASSERT(!mm->no_os_mmap);
 #if ERTS_HAVE_OS_MMAP
 	ERTS_MUNMAP_OP_LCK(ptr, size);
 	ERTS_MMAP_SIZE_OS_DEC(size);
@@ -1691,45 +1694,45 @@ erts_munmap(Uint32 flags, void *ptr, UWord size)
 	ErtsFreeSegDesc *prev, *next, *desc;
 	UWord ad_sz = 0;
 
-	ERTS_MMAP_ASSERT(mmap_state.supercarrier);
+	ERTS_MMAP_ASSERT(mm->supercarrier);
 
 	start = (char *) ptr;
 	end = start + size;
 
-	erts_smp_mtx_lock(&mmap_state.mtx);
+	erts_smp_mtx_lock(&mm->mtx);
 
 	ERTS_MUNMAP_OP(ptr, size);
 
 	if (ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)) {
 
-	    map = &mmap_state.sa.map;
+	    map = &mm->sa.map;
 	    adjacent_free_seg(map, start, end, &prev, &next);
 
 	    ERTS_MMAP_SIZE_SC_SA_DEC(size);
-	    if (end == mmap_state.sa.top) {
+	    if (end == mm->sa.top) {
 		ERTS_MMAP_ASSERT(!next);
 		if (prev) {
 		    start = prev->start;
 		    delete_free_seg(map, prev);
-		    free_desc(prev);
+		    free_desc(mm, prev);
 		}
-		mmap_state.sa.top = start;
+		mm->sa.top = start;
 		goto supercarrier_success;
 	    }
 	}
 	else {
-	    map = &mmap_state.sua.map;
+	    map = &mm->sua.map;
 	    adjacent_free_seg(map, start, end, &prev, &next);
 
 	    ERTS_MMAP_SIZE_SC_SUA_DEC(size);
-	    if (start == mmap_state.sua.bot) {
+	    if (start == mm->sua.bot) {
 		ERTS_MMAP_ASSERT(!prev);
 		if (next) {
 		    end = next->end;
 		    delete_free_seg(map, next);
-		    free_desc(next);
+		    free_desc(mm, next);
 		}
-		mmap_state.sua.bot = end;
+		mm->sua.bot = end;
 		goto supercarrier_success;
 	    }
 	}
@@ -1741,7 +1744,7 @@ erts_munmap(Uint32 flags, void *ptr, UWord size)
 	    end = next->end;
 	    if (prev) {
 		delete_free_seg(map, next);
-		free_desc(next);
+		free_desc(mm, next);
 		goto save_prev;
 	    }
 	    desc = next;
@@ -1755,7 +1758,7 @@ erts_munmap(Uint32 flags, void *ptr, UWord size)
 	if (desc)
 	    resize_free_seg(map, desc, start, end);
 	else
-	    ad_sz = alloc_desc_insert_free_seg(map, start, end);
+	    ad_sz = alloc_desc_insert_free_seg(mm, map, start, end);
 	
     supercarrier_success: {
 	    UWord unres_sz;
@@ -1763,30 +1766,32 @@ erts_munmap(Uint32 flags, void *ptr, UWord size)
 	    ERTS_MMAP_ASSERT(size >= ad_sz);
 	    unres_sz = size - ad_sz;
 	    if (unres_sz)
-		mmap_state.unreserve_physical(((char *) ptr) + ad_sz, unres_sz);
+		mm->unreserve_physical(((char *) ptr) + ad_sz, unres_sz);
 
-            erts_smp_mtx_unlock(&mmap_state.mtx);
+            erts_smp_mtx_unlock(&mm->mtx);
 	}
     }
 }
 
 static void *
-remap_move(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
+remap_move(ErtsMemMapper* mm,
+           Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 {
     UWord size = *sizep;
-    void *new_ptr = erts_mmap(flags, &size);
+    void *new_ptr = erts_mmap(mm, flags, &size);
     if (!new_ptr)
 	return NULL;
     *sizep = size;
     if (old_size < size)
 	size = old_size;
     sys_memcpy(new_ptr, ptr, (size_t) size);
-    erts_munmap(flags, ptr, old_size);
+    erts_munmap(mm, flags, ptr, old_size);
     return new_ptr;
 }
 
 void *
-erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
+erts_mremap(ErtsMemMapper* mm,
+            Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 {
     void *new_ptr;
     Uint32 superaligned;
@@ -1798,11 +1803,11 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 
     if (!ERTS_MMAP_IN_SUPERCARRIER(ptr)) {
 
-	ERTS_MMAP_ASSERT(!mmap_state.no_os_mmap);
+	ERTS_MMAP_ASSERT(!mm->no_os_mmap);
 
-	if (!(ERTS_MMAPFLG_OS_ONLY & flags) && mmap_state.supercarrier) {
-	    new_ptr = remap_move(ERTS_MMAPFLG_SUPERCARRIER_ONLY|flags, ptr,
-				 old_size, sizep);
+	if (!(ERTS_MMAPFLG_OS_ONLY & flags) && mm->supercarrier) {
+	    new_ptr = remap_move(mm, ERTS_MMAPFLG_SUPERCARRIER_ONLY|flags,
+                                 ptr, old_size, sizep);
 	    if (new_ptr)
 		return new_ptr;
 	}
@@ -1849,7 +1854,7 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 #endif
 #if ERTS_HAVE_OS_MREMAP
 	if (superaligned)
-	    return remap_move(flags, new_ptr, old_size, sizep);
+	    return remap_move(mm, flags, new_ptr, old_size, sizep);
 	else {
 	    new_ptr = os_mremap(ptr, old_size, asize, 0);
 	    if (!new_ptr)
@@ -1871,10 +1876,10 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 	ErtsFreeSegDesc *prev, *next;
 	UWord ad_sz = 0;
 
-	ERTS_MMAP_ASSERT(mmap_state.supercarrier);
+	ERTS_MMAP_ASSERT(mm->supercarrier);
 
 	if (ERTS_MMAPFLG_OS_ONLY & flags)
-	    return remap_move(flags, ptr, old_size, sizep);
+	    return remap_move(mm, flags, ptr, old_size, sizep);
 
 	superaligned = (ERTS_MMAPFLG_SUPERALIGNED & flags);
 
@@ -1882,19 +1887,19 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 		 ? ERTS_SUPERALIGNED_CEILING(*sizep)
 		 : ERTS_PAGEALIGNED_CEILING(*sizep));
 
-	erts_smp_mtx_lock(&mmap_state.mtx);
+	erts_smp_mtx_lock(&mm->mtx);
 
 	if (ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)
-	    ? (!superaligned && lookup_free_seg(&mmap_state.sua.map, asize))
-	    : (superaligned && lookup_free_seg(&mmap_state.sa.map, asize))) {
-	    erts_smp_mtx_unlock(&mmap_state.mtx);
+	    ? (!superaligned && lookup_free_seg(&mm->sua.map, asize))
+	    : (superaligned && lookup_free_seg(&mm->sa.map, asize))) {
+	    erts_smp_mtx_unlock(&mm->mtx);
 	    /*
 	     * Segment currently in wrong area (due to a previous memory
 	     * shortage), move it to the right area.
 	     * (remap_move() will succeed)
 	     */
-	    return remap_move(ERTS_MMAPFLG_SUPERCARRIER_ONLY|flags, ptr,
-			      old_size, sizep);
+	    return remap_move(mm, ERTS_MMAPFLG_SUPERCARRIER_ONLY|flags,
+                              ptr, old_size, sizep);
 	}
 
 	ERTS_MREMAP_OP_START(ptr, old_size, *sizep);
@@ -1916,18 +1921,18 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 	    UWord unres_sz;
 	    new_ptr = ptr;
 	    if (!ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)) {
-		map = &mmap_state.sua.map;
+		map = &mm->sua.map;
 		ERTS_MMAP_SIZE_SC_SUA_DEC(old_size - asize);
 	    }
 	    else {
-		if (end == mmap_state.sa.top) {
-		    mmap_state.sa.top = new_end;
-		    mmap_state.unreserve_physical(((char *) ptr) + asize,
+		if (end == mm->sa.top) {
+		    mm->sa.top = new_end;
+		    mm->unreserve_physical(((char *) ptr) + asize,
 						  old_size - asize);
 		    goto supercarrier_resize_success;
 		}
 		ERTS_MMAP_SIZE_SC_SA_DEC(old_size - asize);
-		map = &mmap_state.sa.map;
+		map = &mm->sa.map;
 	    }
 	    
 	    adjacent_free_seg(map, start, end, &prev, &next);
@@ -1935,11 +1940,11 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 	    if (next)
 		resize_free_seg(map, next, new_end, next->end);
 	    else
-		ad_sz = alloc_desc_insert_free_seg(map, new_end, end);
+		ad_sz = alloc_desc_insert_free_seg(mm, map, new_end, end);
 	    ERTS_MMAP_ASSERT(old_size - asize >= ad_sz);
 	    unres_sz = old_size - asize - ad_sz;
 	    if (unres_sz)
-		mmap_state.unreserve_physical(((char *) ptr) + asize + ad_sz,
+		mm->unreserve_physical(((char *) ptr) + asize + ad_sz,
 					      unres_sz);
 	    goto supercarrier_resize_success;
 	}
@@ -1949,17 +1954,17 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 	    ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(old_size));
 	    ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(asize));
 
-	    adjacent_free_seg(&mmap_state.sua.map, start, end, &prev, &next);
+	    adjacent_free_seg(&mm->sua.map, start, end, &prev, &next);
 
 	    if (next && new_end <= next->end) {
-		if (!mmap_state.reserve_physical(((char *) ptr) + old_size,
+		if (!mm->reserve_physical(((char *) ptr) + old_size,
 						 asize - old_size))
 		    goto supercarrier_reserve_failure;
 		if (new_end < next->end)
-		    resize_free_seg(&mmap_state.sua.map, next, new_end, next->end);
+		    resize_free_seg(&mm->sua.map, next, new_end, next->end);
 		else {
-		    delete_free_seg(&mmap_state.sua.map, next);
-		    free_desc(next);
+		    delete_free_seg(&mm->sua.map, next);
+		    free_desc(mm, next);
 		}
 		new_ptr = ptr;
 		ERTS_MMAP_SIZE_SC_SUA_INC(asize - old_size);
@@ -1968,28 +1973,28 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 	}
 	else { /* Superaligned area */
 
-	    if (end == mmap_state.sa.top) {
-		if (new_end <= mmap_state.sua.bot) {
-		    if (!mmap_state.reserve_physical(((char *) ptr) + old_size,
+	    if (end == mm->sa.top) {
+		if (new_end <= mm->sua.bot) {
+		    if (!mm->reserve_physical(((char *) ptr) + old_size,
 						     asize - old_size))
 			goto supercarrier_reserve_failure;
-		    mmap_state.sa.top = new_end;
+		    mm->sa.top = new_end;
 		    new_ptr = ptr;
 		    ERTS_MMAP_SIZE_SC_SA_INC(asize - old_size);
 		    goto supercarrier_resize_success;
 		}
 	    }
 	    else {
-		adjacent_free_seg(&mmap_state.sa.map, start, end, &prev, &next);
+		adjacent_free_seg(&mm->sa.map, start, end, &prev, &next);
 		if (next && new_end <= next->end) {
-		    if (!mmap_state.reserve_physical(((char *) ptr) + old_size,
+		    if (!mm->reserve_physical(((char *) ptr) + old_size,
 						     asize - old_size))
 			goto supercarrier_reserve_failure;
 		    if (new_end < next->end)
-			resize_free_seg(&mmap_state.sa.map, next, new_end, next->end);
+			resize_free_seg(&mm->sa.map, next, new_end, next->end);
 		    else {
-			delete_free_seg(&mmap_state.sa.map, next);
-			free_desc(next);
+			delete_free_seg(&mm->sa.map, next);
+			free_desc(mm, next);
 		    }
 		    new_ptr = ptr;
 		    ERTS_MMAP_SIZE_SC_SA_INC(asize - old_size);
@@ -1999,12 +2004,12 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
 	}
 
 	ERTS_MMAP_OP_ABORT();
-	erts_smp_mtx_unlock(&mmap_state.mtx);
+	erts_smp_mtx_unlock(&mm->mtx);
 
 	/* Failed to resize... */
     }
 
-    return remap_move(flags, ptr, old_size, sizep);
+    return remap_move(mm, flags, ptr, old_size, sizep);
 
 supercarrier_resize_success:
 
@@ -2021,25 +2026,24 @@ supercarrier_resize_success:
 #endif
 
     ERTS_MREMAP_OP_END(new_ptr, asize);
-    erts_smp_mtx_unlock(&mmap_state.mtx);
+    erts_smp_mtx_unlock(&mm->mtx);
 
     *sizep = asize;
     return new_ptr;
 
 supercarrier_reserve_failure:
     ERTS_MREMAP_OP_END(NULL, old_size);
-    erts_smp_mtx_unlock(&mmap_state.mtx);
+    erts_smp_mtx_unlock(&mm->mtx);
     *sizep = old_size;
     return NULL;
     
 }
 
-int erts_mmap_in_supercarrier(void *ptr)
+int erts_mmap_in_supercarrier(ErtsMemMapper* mm, void *ptr)
 {
     return ERTS_MMAP_IN_SUPERCARRIER(ptr);
 }
 
-
 static struct {
     Eterm total;
     Eterm total_sa;
@@ -2102,7 +2106,7 @@ static void hard_dbg_mseg_init(void);
 #endif
 
 void
-erts_mmap_init(ErtsMMapInit *init)
+erts_mmap_init(ErtsMemMapper* mm, ErtsMMapInit *init)
 {
     int virtual_map = 0;
     char *start = NULL, *end = NULL;
@@ -2130,17 +2134,17 @@ erts_mmap_init(ErtsMMapInit *init)
 
     ERTS_MMAP_OP_RINGBUF_INIT();
 
-    mmap_state.supercarrier = 0;
-    mmap_state.reserve_physical = reserve_noop;
-    mmap_state.unreserve_physical = unreserve_noop;
+    mm->supercarrier = 0;
+    mm->reserve_physical = reserve_noop;
+    mm->unreserve_physical = unreserve_noop;
 
 #if HAVE_MMAP && !defined(MAP_ANON)
-    mmap_state.mmap_fd = open("/dev/zero", O_RDWR);
-    if (mmap_state.mmap_fd < 0)
+    mm->mmap_fd = open("/dev/zero", O_RDWR);
+    if (mm->mmap_fd < 0)
 	erl_exit(-1, "erts_mmap: Failed to open /dev/zero\n");
 #endif
 
-    erts_smp_mtx_init(&mmap_state.mtx, "erts_mmap");
+    erts_smp_mtx_init(&mm->mtx, "erts_mmap");
     erts_mtx_init(&am.init_mutex, "mmap_init_atoms");
 
 #ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
@@ -2157,8 +2161,8 @@ erts_mmap_init(ErtsMMapInit *init)
 	sz = start - ptr;
 	if (sz)
 	    os_munmap(end, sz);
-	mmap_state.reserve_physical = os_reserve_physical;
-	mmap_state.unreserve_physical = os_unreserve_physical;
+	mm->reserve_physical = os_reserve_physical;
+	mm->unreserve_physical = os_unreserve_physical;
 	virtual_map = 1;
     }
     else
@@ -2176,8 +2180,8 @@ erts_mmap_init(ErtsMMapInit *init)
 #ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
 	if (!init->scrpm) {
 	    start = os_mmap_virtual(NULL, sz);
-	    mmap_state.reserve_physical = os_reserve_physical;
-	    mmap_state.unreserve_physical = os_unreserve_physical;
+	    mm->reserve_physical = os_reserve_physical;
+	    mm->unreserve_physical = os_unreserve_physical;
 	    virtual_map = 1;
 	}
 	else
@@ -2205,30 +2209,30 @@ erts_mmap_init(ErtsMMapInit *init)
     }
 #endif
 
-    mmap_state.no.free_seg_descs = 0;
-    mmap_state.no.free_segs.curr = 0;
-    mmap_state.no.free_segs.max = 0;
+    mm->no.free_seg_descs = 0;
+    mm->no.free_segs.curr = 0;
+    mm->no.free_segs.max = 0;
 
-    mmap_state.size.supercarrier.total = 0;
-    mmap_state.size.supercarrier.used.total = 0;
-    mmap_state.size.supercarrier.used.sa = 0;
-    mmap_state.size.supercarrier.used.sua = 0;
-    mmap_state.size.os.used = 0;
+    mm->size.supercarrier.total = 0;
+    mm->size.supercarrier.used.total = 0;
+    mm->size.supercarrier.used.sa = 0;
+    mm->size.supercarrier.used.sua = 0;
+    mm->size.os.used = 0;
 
-    mmap_state.desc.new_area_hint = NULL;
+    mm->desc.new_area_hint = NULL;
 
     if (!start) {
-	mmap_state.sa.bot = NULL;
-	mmap_state.sua.top = NULL;
-	mmap_state.sa.bot = NULL;
-	mmap_state.sua.top = NULL;
-	mmap_state.no_os_mmap = 0;
-        mmap_state.supercarrier = 0;
+	mm->sa.bot = NULL;
+	mm->sua.top = NULL;
+	mm->sa.bot = NULL;
+	mm->sua.top = NULL;
+	mm->no_os_mmap = 0;
+        mm->supercarrier = 0;
     }
     else {
 	size_t desc_size;
 
-	mmap_state.no_os_mmap = init->sco;
+	mm->no_os_mmap = init->sco;
 
 	desc_size = init->scrfsd;
 	if (desc_size < 100)
@@ -2239,60 +2243,60 @@ erts_mmap_init(ErtsMMapInit *init)
 	     + ERTS_PAGEALIGNED_SIZE) > end - start)
 	    erl_exit(-1, "erts_mmap: No space for segments in super carrier\n");
 
-	mmap_state.sa.bot = start;
-	mmap_state.sa.bot += desc_size;
-	mmap_state.sa.bot = (char *) ERTS_SUPERALIGNED_CEILING(mmap_state.sa.bot);
-	mmap_state.sa.top = mmap_state.sa.bot;
-	mmap_state.sua.top = end;
-	mmap_state.sua.bot = mmap_state.sua.top;
+	mm->sa.bot = start;
+	mm->sa.bot += desc_size;
+	mm->sa.bot = (char *) ERTS_SUPERALIGNED_CEILING(mm->sa.bot);
+	mm->sa.top = mm->sa.bot;
+	mm->sua.top = end;
+	mm->sua.bot = mm->sua.top;
 
-	mmap_state.size.supercarrier.used.total += (UWord) (mmap_state.sa.bot - start);
+	mm->size.supercarrier.used.total += (UWord) (mm->sa.bot - start);
 
-	mmap_state.desc.free_list = NULL;
-        mmap_state.desc.reserved = 0;
+	mm->desc.free_list = NULL;
+        mm->desc.reserved = 0;
 
 	if (end == (void *) 0) {
 	    /*
 	     * Very unlikely, but we need a guarantee
-	     * that `mmap_state.sua.top` always will
+	     * that `mm->sua.top` always will
 	     * compare as larger than all segment pointers
 	     * into the super carrier...
 	     */
-	    mmap_state.sua.top -= ERTS_PAGEALIGNED_SIZE;
-	    mmap_state.size.supercarrier.used.total += ERTS_PAGEALIGNED_SIZE;
+	    mm->sua.top -= ERTS_PAGEALIGNED_SIZE;
+	    mm->size.supercarrier.used.total += ERTS_PAGEALIGNED_SIZE;
 #ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
-	    if (!virtual_map || os_reserve_physical(mmap_state.sua.top, ERTS_PAGEALIGNED_SIZE))
+	    if (!virtual_map || os_reserve_physical(mm->sua.top, ERTS_PAGEALIGNED_SIZE))
 #endif
-		add_free_desc_area(mmap_state.sua.top, end);
-            mmap_state.desc.reserved += (end - mmap_state.sua.top) / sizeof(ErtsFreeSegDesc);
+		add_free_desc_area(mm, mm->sua.top, end);
+            mm->desc.reserved += (end - mm->sua.top) / sizeof(ErtsFreeSegDesc);
 	}
 
-	mmap_state.size.supercarrier.total = (UWord) (mmap_state.sua.top - start);
+	mm->size.supercarrier.total = (UWord) (mm->sua.top - start);
 
 	/*
 	 * Area before (and after) super carrier
 	 * will be used for free segment descritors.
 	 */
 #ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
-	if (virtual_map && !os_reserve_physical(start, mmap_state.sa.bot - start))
+	if (virtual_map && !os_reserve_physical(start, mm->sa.bot - start))
 	    erl_exit(-1, "erts_mmap: Failed to reserve physical memory for descriptors\n");
 #endif
-	mmap_state.desc.unused_start = start;
-	mmap_state.desc.unused_end = mmap_state.sa.bot;
-        mmap_state.desc.reserved += ((mmap_state.desc.unused_end - start)
+	mm->desc.unused_start = start;
+	mm->desc.unused_end = mm->sa.bot;
+        mm->desc.reserved += ((mm->desc.unused_end - start)
                                      / sizeof(ErtsFreeSegDesc));
 
-	init_free_seg_map(&mmap_state.sa.map, SA_SZ_ADDR_ORDER);
-	init_free_seg_map(&mmap_state.sua.map, SZ_REVERSE_ADDR_ORDER);
+	init_free_seg_map(&mm->sa.map, SA_SZ_ADDR_ORDER);
+	init_free_seg_map(&mm->sua.map, SZ_REVERSE_ADDR_ORDER);
 
-	mmap_state.supercarrier = 1;
+	mm->supercarrier = 1;
 
-	mmap_state.desc.new_area_hint = end;
+	mm->desc.new_area_hint = end;
 
     }
 
 #if !ERTS_HAVE_OS_MMAP
-    mmap_state.no_os_mmap = 1;
+    mm->no_os_mmap = 1;
 #endif
 
 #ifdef HARD_DEBUG_MSEG
@@ -2307,7 +2311,8 @@ add_2tup(Uint **hpp, Uint *szp, Eterm *lp, Eterm el1, Eterm el2)
     *lp = erts_bld_cons(hpp, szp, erts_bld_tuple(hpp, szp, 2, el1, el2), *lp);
 }
 
-Eterm erts_mmap_info(int *print_to_p,
+Eterm erts_mmap_info(ErtsMemMapper* mm,
+                     int *print_to_p,
                      void *print_to_arg,
                      Eterm** hpp, Uint* szp,
                      struct erts_mmap_info_struct* emis)
@@ -2322,29 +2327,29 @@ Eterm erts_mmap_info(int *print_to_p,
     Eterm res = THE_NON_VALUE;
 
     if (!hpp) {
-        erts_smp_mtx_lock(&mmap_state.mtx);
-        emis->sizes[0] = mmap_state.size.supercarrier.total;
-        emis->sizes[1] = mmap_state.sa.top  - mmap_state.sa.bot;
-        emis->sizes[2] = mmap_state.sua.top - mmap_state.sua.bot;
-        emis->sizes[3] = mmap_state.size.supercarrier.used.total;
-        emis->sizes[4] = mmap_state.size.supercarrier.used.sa;
-        emis->sizes[5] = mmap_state.size.supercarrier.used.sua;
+        erts_smp_mtx_lock(&mm->mtx);
+        emis->sizes[0] = mm->size.supercarrier.total;
+        emis->sizes[1] = mm->sa.top  - mm->sa.bot;
+        emis->sizes[2] = mm->sua.top - mm->sua.bot;
+        emis->sizes[3] = mm->size.supercarrier.used.total;
+        emis->sizes[4] = mm->size.supercarrier.used.sa;
+        emis->sizes[5] = mm->size.supercarrier.used.sua;
 
-        emis->segs[0] = mmap_state.no.free_segs.curr;
-        emis->segs[1] = mmap_state.no.free_segs.max;
-        emis->segs[2] = mmap_state.no.free_seg_descs;
-        emis->segs[3] = mmap_state.desc.reserved;
-        emis->segs[4] = mmap_state.sa.map.nseg;
-        emis->segs[5] = mmap_state.sua.map.nseg;
+        emis->segs[0] = mm->no.free_segs.curr;
+        emis->segs[1] = mm->no.free_segs.max;
+        emis->segs[2] = mm->no.free_seg_descs;
+        emis->segs[3] = mm->desc.reserved;
+        emis->segs[4] = mm->sa.map.nseg;
+        emis->segs[5] = mm->sua.map.nseg;
 
-        emis->os_used = mmap_state.size.os.used;
-        erts_smp_mtx_unlock(&mmap_state.mtx);
+        emis->os_used = mm->size.os.used;
+        erts_smp_mtx_unlock(&mm->mtx);
     }
 
     if (print_to_p) {
         int to = *print_to_p;
 	void *arg = print_to_arg;
-        if (mmap_state.supercarrier) {
+        if (mm->supercarrier) {
             const char* prefix = "supercarrier ";
             erts_print(to, arg, "%stotal size: %bpu\n", prefix, emis->sizes[0]);
             erts_print(to, arg, "%stotal sa size: %bpu\n", prefix, emis->sizes[1]);
@@ -2359,7 +2364,7 @@ Eterm erts_mmap_info(int *print_to_p,
             erts_print(to, arg, "%ssa free segs: %bpu\n", prefix, emis->segs[4]);
             erts_print(to, arg, "%ssua free segs: %bpu\n", prefix, emis->segs[5]);
         }
-        if (!mmap_state.no_os_mmap) {
+        if (!mm->no_os_mmap) {
             erts_print(to, arg, "os mmap size used: %bpu\n", emis->os_used);
         }
     }
@@ -2371,7 +2376,7 @@ Eterm erts_mmap_info(int *print_to_p,
         }
 
         lix = 0;
-        if (mmap_state.supercarrier) {
+        if (mm->supercarrier) {
             group[0] = erts_bld_atom_uword_2tup_list(hpp, szp,
                                                      sizeof(size_tags)/sizeof(Eterm),
                                                      size_tags, emis->sizes);
@@ -2383,7 +2388,7 @@ Eterm erts_mmap_info(int *print_to_p,
             lix++;
         }
 
-        if (!mmap_state.no_os_mmap) {
+        if (!mm->no_os_mmap) {
             group[0] = erts_bld_atom_uword_2tup_list(hpp, szp,
                                                       1, &am.used, &emis->os_used);
             list[lix] = erts_bld_2tup_list(hpp, szp, 1, group_tags, group);
@@ -2395,25 +2400,26 @@ Eterm erts_mmap_info(int *print_to_p,
     return res;
 }
 
-Eterm erts_mmap_info_options(char *prefix,
+Eterm erts_mmap_info_options(ErtsMemMapper* mm,
+                             char *prefix,
                              int *print_to_p,
                              void *print_to_arg,
                              Uint **hpp,
                              Uint *szp)
 {
-    const UWord scs = mmap_state.sua.top - mmap_state.sa.bot;
-    const Eterm sco = mmap_state.no_os_mmap ? am_true : am_false;
-    const Eterm scrpm = (mmap_state.reserve_physical == reserve_noop) ? am_true : am_false;
+    const UWord scs = mm->sua.top - mm->sa.bot;
+    const Eterm sco = mm->no_os_mmap ? am_true : am_false;
+    const Eterm scrpm = (mm->reserve_physical == reserve_noop) ? am_true : am_false;
     Eterm res = THE_NON_VALUE;
 
     if (print_to_p) {
         int to = *print_to_p;
 	void *arg = print_to_arg;
         erts_print(to, arg, "%sscs: %bpu\n", prefix, scs);
-        if (mmap_state.supercarrier) {
+        if (mm->supercarrier) {
             erts_print(to, arg, "%ssco: %T\n", prefix, sco);
             erts_print(to, arg, "%sscrpm: %T\n", prefix, scrpm);
-            erts_print(to, arg, "%sscrfsd: %beu\n", prefix, mmap_state.desc.reserved);
+            erts_print(to, arg, "%sscrfsd: %beu\n", prefix, mm->desc.reserved);
         }
     }
 
@@ -2423,9 +2429,9 @@ Eterm erts_mmap_info_options(char *prefix,
         }
 
         res = NIL;
-        if (mmap_state.supercarrier) {
+        if (mm->supercarrier) {
             add_2tup(hpp, szp, &res, am.scrfsd,
-                     erts_bld_uint(hpp,szp, mmap_state.desc.reserved));
+                     erts_bld_uint(hpp,szp, mm->desc.reserved));
             add_2tup(hpp, szp, &res, am.scrpm, scrpm);
             add_2tup(hpp, szp, &res, am.sco, sco);
         }
@@ -2435,9 +2441,9 @@ Eterm erts_mmap_info_options(char *prefix,
 }
 
 
-Eterm erts_mmap_debug_info(Process* p)
+Eterm erts_mmap_debug_info(ErtsMemMapper* mm, Process* p)
 {
-    if (mmap_state.supercarrier) {
+    if (mm->supercarrier) {
         ERTS_DECL_AM(sabot);
         ERTS_DECL_AM(satop);
         ERTS_DECL_AM(suabot);
@@ -2448,14 +2454,14 @@ Eterm erts_mmap_debug_info(Process* p)
         Eterm *hp, *hp_end;
         Uint may_need;
 
-        erts_smp_mtx_lock(&mmap_state.mtx);
-        values[0] = (UWord)mmap_state.sa.bot;
-        values[1] = (UWord)mmap_state.sa.top;
-        values[2] = (UWord)mmap_state.sua.bot;
-        values[3] = (UWord)mmap_state.sua.top;
-        sa_list = build_free_seg_list(p, &mmap_state.sa.map);
-        sua_list = build_free_seg_list(p, &mmap_state.sua.map);
-        erts_smp_mtx_unlock(&mmap_state.mtx);
+        erts_smp_mtx_lock(&mm->mtx);
+        values[0] = (UWord)mm->sa.bot;
+        values[1] = (UWord)mm->sa.top;
+        values[2] = (UWord)mm->sua.bot;
+        values[3] = (UWord)mm->sua.top;
+        sa_list = build_free_seg_list(p, &mm->sa.map);
+        sua_list = build_free_seg_list(p, &mm->sua.map);
+        erts_smp_mtx_unlock(&mm->mtx);
 
         may_need = 4*(2+3+2) + 2*(2+3);
         hp = HAlloc(p, may_need);
diff --git a/erts/emulator/sys/common/erl_mmap.h b/erts/emulator/sys/common/erl_mmap.h
index 51f830d045..8707c23527 100644
--- a/erts/emulator/sys/common/erl_mmap.h
+++ b/erts/emulator/sys/common/erl_mmap.h
@@ -50,23 +50,26 @@ typedef struct {
 #define ERTS_MMAP_INIT_DEFAULT_INITER \
     {{NULL, NULL}, {NULL, NULL}, 0, 1, (1 << 16), 1}
 
-void *erts_mmap(Uint32 flags, UWord *sizep);
-void erts_munmap(Uint32 flags, void *ptr, UWord size);
-void *erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep);
-int erts_mmap_in_supercarrier(void *ptr);
-void erts_mmap_init(ErtsMMapInit*);
+typedef struct ErtsMemMapper_ ErtsMemMapper;
+extern ErtsMemMapper erts_dflt_mmapper;
+void *erts_mmap(ErtsMemMapper*, Uint32 flags, UWord *sizep);
+void erts_munmap(ErtsMemMapper*, Uint32 flags, void *ptr, UWord size);
+void *erts_mremap(ErtsMemMapper*, Uint32 flags, void *ptr, UWord old_size, UWord *sizep);
+int erts_mmap_in_supercarrier(ErtsMemMapper*, void *ptr);
+void erts_mmap_init(ErtsMemMapper*, ErtsMMapInit*);
 struct erts_mmap_info_struct
 {
     UWord sizes[6];
     UWord segs[6];
     UWord os_used;
 };
-Eterm erts_mmap_info(int *print_to_p, void *print_to_arg,
+Eterm erts_mmap_info(ErtsMemMapper*, int *print_to_p, void *print_to_arg,
                      Eterm** hpp, Uint* szp, struct erts_mmap_info_struct*);
-Eterm erts_mmap_info_options(char *prefix, int *print_to_p, void *print_to_arg,
+Eterm erts_mmap_info_options(ErtsMemMapper*,
+                             char *prefix, int *print_to_p, void *print_to_arg,
                              Uint **hpp, Uint *szp);
 struct process;
-Eterm erts_mmap_debug_info(struct process*);
+Eterm erts_mmap_debug_info(ErtsMemMapper*, struct process*);
 
 #define ERTS_SUPERALIGNED_SIZE \
     (1 << ERTS_MMAP_SUPERALIGNED_BITS)
diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c
index 7eb8a4a460..aadcc755c1 100644
--- a/erts/emulator/sys/common/erl_mseg.c
+++ b/erts/emulator/sys/common/erl_mseg.c
@@ -291,7 +291,7 @@ mseg_create(ErtsMsegAllctr_t *ma, Uint flags, UWord *sizep)
     if (MSEG_FLG_IS_2POW(flags))
 	mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
 
-    seg = erts_mmap(mmap_flags, sizep);
+    seg = erts_mmap(&erts_dflt_mmapper, mmap_flags, sizep);
 
 #ifdef ERTS_PRINT_ERTS_MMAP
     erts_fprintf(stderr, "%p = erts_mmap(%s, {%bpu, %bpu});\n", seg,
@@ -311,7 +311,7 @@ mseg_destroy(ErtsMsegAllctr_t *ma, Uint flags, void *seg_p, UWord size) {
     if (MSEG_FLG_IS_2POW(flags))
 	 mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
 
-    erts_munmap(mmap_flags, seg_p, size);
+    erts_munmap(&erts_dflt_mmapper, mmap_flags, seg_p, size);
 #ifdef ERTS_PRINT_ERTS_MMAP
     erts_fprintf(stderr, "erts_munmap(%s, %p, %bpu);\n",
 		 (mmap_flags & ERTS_MMAPFLG_SUPERALIGNED) ? "sa" : "sua",
@@ -332,7 +332,7 @@ mseg_recreate(ErtsMsegAllctr_t *ma, Uint flags, void *old_seg, UWord old_size, U
     if (MSEG_FLG_IS_2POW(flags))
 	mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
 
-    new_seg = erts_mremap(mmap_flags, old_seg, old_size, sizep);
+    new_seg = erts_mremap(&erts_dflt_mmapper, mmap_flags, old_seg, old_size, sizep);
 
 #ifdef ERTS_PRINT_ERTS_MMAP
     erts_fprintf(stderr, "%p = erts_mremap(%s, %p, %bpu, {%bpu, %bpu});\n",
@@ -997,7 +997,8 @@ info_options(ErtsMsegAllctr_t *ma,
 {
     Eterm res;
 
-    res = erts_mmap_info_options(prefix, print_to_p, print_to_arg, hpp, szp);
+    res = erts_mmap_info_options(&erts_dflt_mmapper,
+                                 prefix, print_to_p, print_to_arg, hpp, szp);
 
     if (print_to_p) {
 	int to = *print_to_p;
@@ -1401,7 +1402,7 @@ erts_mseg_init(ErtsMsegInit_t *init)
 
     erts_mtx_init(&init_atoms_mutex, "mseg_init_atoms");
 
-    erts_mmap_init(&init->mmap);
+    erts_mmap_init(&erts_dflt_mmapper, &init->mmap);
 
     if (!IS_2POW(GET_PAGE_SIZE))
 	erl_exit(ERTS_ABORT_EXIT, "erts_mseg: Unexpected page_size %beu\n", GET_PAGE_SIZE);
-- 
cgit v1.2.3


From b7f760cee119e1824de0cfc2b34ae6fe971bf505 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Fri, 11 Sep 2015 16:03:00 +0200
Subject: erts: Add support for fast erts_is_literal()

---
 erts/emulator/sys/common/erl_mmap.c | 19 ++++++++++++++++++-
 erts/emulator/sys/common/erl_mmap.h | 10 +++++++++-
 erts/emulator/sys/common/erl_mseg.c |  2 +-
 erts/emulator/sys/common/erl_mseg.h |  6 ++++--
 4 files changed, 32 insertions(+), 5 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_mmap.c b/erts/emulator/sys/common/erl_mmap.c
index e8ff2bf752..03ca080c14 100644
--- a/erts/emulator/sys/common/erl_mmap.c
+++ b/erts/emulator/sys/common/erl_mmap.c
@@ -349,6 +349,12 @@ struct ErtsMemMapper_ {
 
 ErtsMemMapper erts_dflt_mmapper;
 
+#if defined(ARCH_64) && defined(ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION)
+ErtsMemMapper erts_literal_mmapper;
+char* erts_literals_start;
+UWord erts_literals_size;
+#endif
+
 #define ERTS_MMAP_SIZE_SC_SA_INC(SZ) 						\
     do {									\
 	mm->size.supercarrier.used.total += (SZ);			\
@@ -2108,6 +2114,7 @@ static void hard_dbg_mseg_init(void);
 void
 erts_mmap_init(ErtsMemMapper* mm, ErtsMMapInit *init)
 {
+    static int is_first_call = 1;
     int virtual_map = 0;
     char *start = NULL, *end = NULL;
     UWord pagesize;
@@ -2145,7 +2152,9 @@ erts_mmap_init(ErtsMemMapper* mm, ErtsMMapInit *init)
 #endif
 
     erts_smp_mtx_init(&mm->mtx, "erts_mmap");
-    erts_mtx_init(&am.init_mutex, "mmap_init_atoms");
+    if (is_first_call) {
+        erts_mtx_init(&am.init_mutex, "mmap_init_atoms");
+    }
 
 #ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
     if (init->virtual_range.start) {
@@ -2302,6 +2311,14 @@ erts_mmap_init(ErtsMemMapper* mm, ErtsMMapInit *init)
 #ifdef HARD_DEBUG_MSEG
     hard_dbg_mseg_init();
 #endif
+
+#if defined(ARCH_64) && defined(ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION)
+   if (mm == &erts_literal_mmapper) {
+       erts_literals_start = erts_literal_mmapper.sa.bot;
+       erts_literals_size  = erts_literal_mmapper.sua.top - erts_literals_start;
+    }
+#endif
+    is_first_call = 0;
 }
 
 
diff --git a/erts/emulator/sys/common/erl_mmap.h b/erts/emulator/sys/common/erl_mmap.h
index 8707c23527..61d912fd28 100644
--- a/erts/emulator/sys/common/erl_mmap.h
+++ b/erts/emulator/sys/common/erl_mmap.h
@@ -50,8 +50,11 @@ typedef struct {
 #define ERTS_MMAP_INIT_DEFAULT_INITER \
     {{NULL, NULL}, {NULL, NULL}, 0, 1, (1 << 16), 1}
 
+#define ERTS_MMAP_INIT_LITERAL_INITER \
+    {{NULL, NULL}, {NULL, NULL}, 1024*1024*1024, 1, (1 << 16), 0}
+
 typedef struct ErtsMemMapper_ ErtsMemMapper;
-extern ErtsMemMapper erts_dflt_mmapper;
+
 void *erts_mmap(ErtsMemMapper*, Uint32 flags, UWord *sizep);
 void erts_munmap(ErtsMemMapper*, Uint32 flags, void *ptr, UWord size);
 void *erts_mremap(ErtsMemMapper*, Uint32 flags, void *ptr, UWord old_size, UWord *sizep);
@@ -121,6 +124,11 @@ Eterm erts_mmap_debug_info(ErtsMemMapper*, struct process*);
 #  define ERTS_HAVE_OS_MMAP 1
 #endif
 
+extern ErtsMemMapper erts_dflt_mmapper;
+#if defined(ARCH_64) && defined(ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION)
+extern ErtsMemMapper erts_literal_mmapper;
+#endif
+
 /*#define HARD_DEBUG_MSEG*/
 #ifdef HARD_DEBUG_MSEG
 #  define HARD_DBG_INSERT_MSEG hard_dbg_insert_mseg
diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c
index aadcc755c1..20695899eb 100644
--- a/erts/emulator/sys/common/erl_mseg.c
+++ b/erts/emulator/sys/common/erl_mseg.c
@@ -1402,7 +1402,7 @@ erts_mseg_init(ErtsMsegInit_t *init)
 
     erts_mtx_init(&init_atoms_mutex, "mseg_init_atoms");
 
-    erts_mmap_init(&erts_dflt_mmapper, &init->mmap);
+    erts_mmap_init(&erts_dflt_mmapper, &init->dflt_mmap);
 
     if (!IS_2POW(GET_PAGE_SIZE))
 	erl_exit(ERTS_ABORT_EXIT, "erts_mseg: Unexpected page_size %beu\n", GET_PAGE_SIZE);
diff --git a/erts/emulator/sys/common/erl_mseg.h b/erts/emulator/sys/common/erl_mseg.h
index 677f8ea4ed..2acd8f8505 100644
--- a/erts/emulator/sys/common/erl_mseg.h
+++ b/erts/emulator/sys/common/erl_mseg.h
@@ -59,7 +59,8 @@ typedef struct {
     Uint rmcbf;
     Uint mcs;
     Uint nos;
-    ErtsMMapInit mmap;
+    ErtsMMapInit dflt_mmap;
+    ErtsMMapInit literal_mmap;
 } ErtsMsegInit_t;
 
 #define ERTS_MSEG_INIT_DEFAULT_INITIALIZER				\
@@ -68,7 +69,8 @@ typedef struct {
     20,			/* rmcbf: Relative max cache bad fit	*/	\
     10,			/* mcs:   Max cache size		*/	\
     1000,		/* cci:   Cache check interval		*/	\
-    ERTS_MMAP_INIT_DEFAULT_INITER					\
+    ERTS_MMAP_INIT_DEFAULT_INITER,					\
+    ERTS_MMAP_INIT_LITERAL_INITER                                       \
 }
 
 typedef struct {
-- 
cgit v1.2.3


From 37f057fca161373bf565ea1bf24fbe89d4946b48 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas.larsson@erlang-solutions.com>
Date: Tue, 14 Jul 2015 15:42:29 +0200
Subject: erts: Rename sys driver structs

---
 erts/emulator/sys/unix/sys.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index 8d7da3e47e..5f7f07940d 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -143,7 +143,7 @@ typedef struct ErtsSysBlocking_ {
 
 
 /* This data is shared by these drivers - initialized by spawn_init() */
-static struct driver_data {
+typedef struct driver_data {
     ErlDrvPort port_num;
     int ofd, packet_bytes;
     ErtsSysReportExit *report_exit;
@@ -152,7 +152,9 @@ static struct driver_data {
     int status;
     int terminating;
     ErtsSysBlocking *blocking;
-} *driver_data;			/* indexed by fd */
+} ErtsSysDriverData;
+
+static ErtsSysDriverData *driver_data;			/* indexed by fd */
 
 static ErtsSysReportExit *report_exit_list;
 #if CHLDWTHR && !defined(ERTS_SMP)
@@ -257,14 +259,16 @@ static volatile int children_died;
 #endif
 
 
-static struct fd_data {
+typedef struct ErtsSysFdData {
     char  pbuf[4];   /* hold partial packet bytes */
     int   psz;       /* size of pbuf */
     char  *buf;
     char  *cpos;
     int   sz;
     int   remain;  /* for input on fd */
-} *fd_data;			/* indexed by fd */
+} ErtsSysFdData;
+
+static ErtsSysFdData *fd_data;			/* indexed by fd */
 
 /* static FUNCTION(int, write_fill, (int, char*, int)); unused? */
 static void note_child_death(int, int);
@@ -1233,7 +1237,7 @@ static RETSIGTYPE onchld(int signum)
 #endif
 }
 
-static int set_blocking_data(struct driver_data *dd) {
+static int set_blocking_data(ErtsSysDriverData *dd) {
 
     dd->blocking = erts_alloc(ERTS_ALC_T_SYS_BLOCKING, sizeof(ErtsSysBlocking));
 
@@ -1329,10 +1333,10 @@ static int spawn_init()
 #endif
 
    sys_signal(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
-   driver_data = (struct driver_data *)
-       erts_alloc(ERTS_ALC_T_DRV_TAB, max_files * sizeof(struct driver_data));
+   driver_data = (ErtsSysDriverData *)
+       erts_alloc(ERTS_ALC_T_DRV_TAB, max_files * sizeof(ErtsSysDriverData));
    erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-			   max_files * sizeof(struct driver_data));
+			   max_files * sizeof(ErtsSysDriverData));
 
    for (i = 0; i < max_files; i++)
       driver_data[i].pid = -1;
@@ -2523,7 +2527,7 @@ static void
 fd_async(void *async_data)
 {
     int res;
-    struct driver_data *dd = (struct driver_data*)async_data;
+    ErtsSysDriverData *dd = (ErtsSysDriverData*)async_data;
     SysIOVec      *iov0;
     SysIOVec      *iov;
     int            iovlen;
@@ -2556,7 +2560,7 @@ fd_async(void *async_data)
 
 void fd_ready_async(ErlDrvData drv_data,
                     ErlDrvThreadData thread_data) {
-    struct driver_data *dd = (struct driver_data *)thread_data;
+    ErtsSysDriverData *dd = (ErtsSysDriverData *)thread_data;
     ErlDrvPort port_num = dd->port_num;
 
     ASSERT(dd->blocking);
@@ -2738,10 +2742,10 @@ erts_sys_unsetenv(char *key)
 void
 sys_init_io(void)
 {
-    fd_data = (struct fd_data *)
-	erts_alloc(ERTS_ALC_T_FD_TAB, max_files * sizeof(struct fd_data));
+    fd_data = (ErtsSysFdData *)
+	erts_alloc(ERTS_ALC_T_FD_TAB, max_files * sizeof(ErtsSysFdData));
     erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-			    max_files * sizeof(struct fd_data));
+			    max_files * sizeof(ErtsSysFdData));
 }
 
 #if (0) /* unused? */
-- 
cgit v1.2.3


From fdc2ce62a041d34cd99413e278e7dd8ff79832d1 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 26 Aug 2015 11:18:29 +0200
Subject: erts: Change name of child_setup to erl_child_setup

---
 erts/emulator/sys/unix/sys.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index 5f7f07940d..1cb7f72a2b 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -195,10 +195,8 @@ extern void erl_crash_dump(char* file, int line, char* fmt, ...);
 #define ERL_BUILD_TYPE_MARKER
 #endif
 
-#define CHILD_SETUP_PROG_NAME	"child_setup" ERL_BUILD_TYPE_MARKER
-#if !DISABLE_VFORK
+#define CHILD_SETUP_PROG_NAME	"erl_child_setup" ERL_BUILD_TYPE_MARKER
 static char *child_setup_prog;
-#endif
 
 #ifdef DEBUG
 static int debug_log = 0;
-- 
cgit v1.2.3


From 6089f3c961a981b6bacb6c1590386bb67905ff23 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 26 Aug 2015 14:43:20 +0200
Subject: erts: Move sys drivers to another file

---
 erts/emulator/sys/unix/erl_unix_sys.h |   16 +
 erts/emulator/sys/unix/sys.c          | 1914 +------------------------------
 erts/emulator/sys/unix/sys_drivers.c  | 1983 +++++++++++++++++++++++++++++++++
 3 files changed, 2003 insertions(+), 1910 deletions(-)
 create mode 100644 erts/emulator/sys/unix/sys_drivers.c

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index 8d4e98bf3a..a11a44c259 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -470,4 +470,20 @@ extern jmp_buf erts_sys_sigsegv_jmp;
     } while(0)
 #endif
 
+#ifdef USE_THREADS
+#  ifdef ENABLE_CHILD_WAITER_THREAD
+#    define CHLDWTHR ENABLE_CHILD_WAITER_THREAD
+#  else
+#    define CHLDWTHR 0
+#  endif
+#  define FDBLOCK 1
+#else
+#  define CHLDWTHR 0
+#  define FDBLOCK 0
+#endif
+
+#define ERTS_SYS_SUSPEND_SIGNAL SIGUSR2
+
+int check_children(void);
+
 #endif /* #ifndef _ERL_UNIX_SYS_H */
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index 1cb7f72a2b..503ef5c2f6 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -67,7 +67,7 @@
 #include "erl_mseg.h"
 
 extern char **environ;
-static erts_smp_rwmtx_t environ_rwmtx;
+erts_smp_rwmtx_t environ_rwmtx;
 
 #define MAX_VSIZE 16		/* Max number of entries allowed in an I/O
 				 * vector sock_sendv().
@@ -76,91 +76,12 @@ static erts_smp_rwmtx_t environ_rwmtx;
  * Don't need global.h, but bif_table.h (included by bif.h),
  * won't compile otherwise
  */
-#include "global.h" 
+#include "global.h"
 #include "bif.h"
 
-#include "erl_sys_driver.h"
 #include "erl_check_io.h"
 #include "erl_cpu_topology.h"
 
-#ifndef DISABLE_VFORK
-#define DISABLE_VFORK 0
-#endif
-
-#if defined IOV_MAX
-#define MAXIOV IOV_MAX
-#elif defined UIO_MAXIOV
-#define MAXIOV UIO_MAXIOV
-#else
-#define MAXIOV 16
-#endif
-
-#ifdef USE_THREADS
-#  ifdef ENABLE_CHILD_WAITER_THREAD
-#    define CHLDWTHR ENABLE_CHILD_WAITER_THREAD
-#  else
-#    define CHLDWTHR 0
-#  endif
-#  define FDBLOCK 1
-#else
-#  define CHLDWTHR 0
-#  define FDBLOCK 0
-#endif
-/*
- * [OTP-3906]
- * Solaris signal management gets confused when threads are used and a
- * lot of child processes dies. The confusion results in that SIGCHLD
- * signals aren't delivered to the emulator which in turn results in
- * a lot of defunct processes in the system.
- *
- * The problem seems to appear when a signal is frequently
- * blocked/unblocked at the same time as the signal is frequently
- * propagated. The child waiter thread is a workaround for this problem.
- * The SIGCHLD signal is always blocked (in all threads), and the child
- * waiter thread fetches the signal by a call to sigwait(). See
- * child_waiter().
- */
-
-typedef struct ErtsSysReportExit_ ErtsSysReportExit;
-struct ErtsSysReportExit_ {
-    ErtsSysReportExit *next;
-    Eterm port;
-    int pid;
-    int ifd;
-    int ofd;
-#if CHLDWTHR && !defined(ERTS_SMP)
-    int status;
-#endif
-};
-
-/* Used by the fd driver iff the fd could not be set to non-blocking */
-typedef struct ErtsSysBlocking_ {
-    ErlDrvPDL pdl;
-    int res;
-    int err;
-    unsigned int pkey;
-} ErtsSysBlocking;
-
-
-/* This data is shared by these drivers - initialized by spawn_init() */
-typedef struct driver_data {
-    ErlDrvPort port_num;
-    int ofd, packet_bytes;
-    ErtsSysReportExit *report_exit;
-    int pid;
-    int alive;
-    int status;
-    int terminating;
-    ErtsSysBlocking *blocking;
-} ErtsSysDriverData;
-
-static ErtsSysDriverData *driver_data;			/* indexed by fd */
-
-static ErtsSysReportExit *report_exit_list;
-#if CHLDWTHR && !defined(ERTS_SMP)
-static ErtsSysReportExit *report_exit_transit_list;
-#endif
-
 extern int  driver_interrupt(int, int);
 extern void do_break(void);
 
@@ -172,32 +93,6 @@ extern void erts_sys_init_float(void);
 
 extern void erl_crash_dump(char* file, int line, char* fmt, ...);
 
-#define DIR_SEPARATOR_CHAR    '/'
-
-#if defined(__ANDROID__)
-#define SHELL "/system/bin/sh"
-#else
-#define SHELL "/bin/sh"
-#endif /* __ANDROID__ */
-
-
-#if defined(DEBUG)
-#define ERL_BUILD_TYPE_MARKER ".debug"
-#elif defined(PURIFY)
-#define ERL_BUILD_TYPE_MARKER ".purify"
-#elif defined(QUANTIFY)
-#define ERL_BUILD_TYPE_MARKER ".quantify"
-#elif defined(PURECOV)
-#define ERL_BUILD_TYPE_MARKER ".purecov"
-#elif defined(VALGRIND)
-#define ERL_BUILD_TYPE_MARKER ".valgrind"
-#else /* opt */
-#define ERL_BUILD_TYPE_MARKER
-#endif
-
-#define CHILD_SETUP_PROG_NAME	"erl_child_setup" ERL_BUILD_TYPE_MARKER
-static char *child_setup_prog;
-
 #ifdef DEBUG
 static int debug_log = 0;
 #endif
@@ -220,61 +115,18 @@ static volatile int have_prepared_crash_dump;
   (have_prepared_crash_dump++)
 #endif
 
-static erts_smp_atomic_t sys_misc_mem_sz;
+erts_smp_atomic_t sys_misc_mem_sz;
 
 #if defined(ERTS_SMP)
 static void smp_sig_notify(char c);
 static int sig_notify_fds[2] = {-1, -1};
 
 static int sig_suspend_fds[2] = {-1, -1};
-#define ERTS_SYS_SUSPEND_SIGNAL SIGUSR2
 
 #endif
 
 jmp_buf erts_sys_sigsegv_jmp;
 
-#if CHLDWTHR || defined(ERTS_SMP)
-erts_mtx_t chld_stat_mtx;
-#endif
-#if CHLDWTHR
-static erts_tid_t child_waiter_tid;
-/* chld_stat_mtx is used to protect against concurrent accesses
-   of the driver_data fields pid, alive, and status. */
-erts_cnd_t chld_stat_cnd;
-static long children_alive;
-#define CHLD_STAT_LOCK		erts_mtx_lock(&chld_stat_mtx)
-#define CHLD_STAT_UNLOCK	erts_mtx_unlock(&chld_stat_mtx)
-#define CHLD_STAT_WAIT		erts_cnd_wait(&chld_stat_cnd, &chld_stat_mtx)
-#define CHLD_STAT_SIGNAL	erts_cnd_signal(&chld_stat_cnd)
-#elif defined(ERTS_SMP) /* ------------------------------------------------- */
-#define CHLD_STAT_LOCK		erts_mtx_lock(&chld_stat_mtx)
-#define CHLD_STAT_UNLOCK	erts_mtx_unlock(&chld_stat_mtx)
-
-#else /* ------------------------------------------------------------------- */
-#define CHLD_STAT_LOCK
-#define CHLD_STAT_UNLOCK
-static volatile int children_died;
-#endif
-
-
-typedef struct ErtsSysFdData {
-    char  pbuf[4];   /* hold partial packet bytes */
-    int   psz;       /* size of pbuf */
-    char  *buf;
-    char  *cpos;
-    int   sz;
-    int   remain;  /* for input on fd */
-} ErtsSysFdData;
-
-static ErtsSysFdData *fd_data;			/* indexed by fd */
-
-/* static FUNCTION(int, write_fill, (int, char*, int)); unused? */
-static void note_child_death(int, int);
-
-#if CHLDWTHR
-static void* child_waiter(void *);
-#endif
-
 static int crashdump_companion_cube_fd = -1;
 
 /********************* General functions ****************************/
@@ -559,8 +411,6 @@ erts_sys_pre_init(void)
 
     erts_thr_init(&eid);
 
-    report_exit_list = NULL;
-
 #ifdef ERTS_ENABLE_LOCK_COUNT
     erts_lcnt_init();
 #endif
@@ -571,17 +421,6 @@ erts_sys_pre_init(void)
 
 #ifdef USE_THREADS
 
-#if CHLDWTHR || defined(ERTS_SMP)
-    erts_mtx_init(&chld_stat_mtx, "child_status");
-#endif
-#if CHLDWTHR
-#ifndef ERTS_SMP
-    report_exit_transit_list = NULL;
-#endif
-    erts_cnd_init(&chld_stat_cnd);
-    children_alive = 0;
-#endif
-
 #ifdef ERTS_SMP
     erts_smp_atomic32_init_nob(&erts_break_requested, 0);
     erts_smp_atomic32_init_nob(&erts_got_sigusr1, 0);
@@ -591,9 +430,6 @@ erts_sys_pre_init(void)
     erts_got_sigusr1 = 0;
     have_prepared_crash_dump = 0;
 #endif
-#if !CHLDWTHR && !defined(ERTS_SMP)
-    children_died = 0;
-#endif
 
 #endif /* USE_THREADS */
 
@@ -630,39 +466,6 @@ erts_sys_pre_init(void)
 void
 erl_sys_init(void)
 {
-#if !DISABLE_VFORK
- {
-    int res;
-    char bindir[MAXPATHLEN];
-    size_t bindirsz = sizeof(bindir);
-    Uint csp_path_sz;
-
-    res = erts_sys_getenv_raw("BINDIR", bindir, &bindirsz);
-    if (res != 0) {
-	if (res < 0)
-	    erl_exit(-1,
-		     "Environment variable BINDIR is not set\n");
-	if (res > 0)
-	    erl_exit(-1,
-		     "Value of environment variable BINDIR is too large\n");
-    }
-    if (bindir[0] != DIR_SEPARATOR_CHAR)
-	erl_exit(-1,
-		 "Environment variable BINDIR does not contain an"
-		 " absolute path\n");
-    csp_path_sz = (strlen(bindir)
-		   + 1 /* DIR_SEPARATOR_CHAR */
-		   + sizeof(CHILD_SETUP_PROG_NAME)
-		   + 1);
-    child_setup_prog = erts_alloc(ERTS_ALC_T_CS_PROG_PATH, csp_path_sz);
-    erts_smp_atomic_add_nob(&sys_misc_mem_sz, csp_path_sz);
-    erts_snprintf(child_setup_prog, csp_path_sz,
-            "%s%c%s",
-            bindir,
-            DIR_SEPARATOR_CHAR,
-            CHILD_SETUP_PROG_NAME);
- }
-#endif
 
 #ifdef USE_SETLINEBUF
     setlinebuf(stdout);
@@ -980,43 +783,6 @@ int sys_max_files(void)
    return(max_files);
 }
 
-static void block_signals(void)
-{
-#if !CHLDWTHR
-   sys_sigblock(SIGCHLD);
-#endif
-#ifndef ERTS_SMP
-   sys_sigblock(SIGINT);
-#ifndef ETHR_UNUSABLE_SIGUSRX
-   sys_sigblock(SIGUSR1);
-#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
-#endif /* #ifndef ERTS_SMP */
-
-#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
-   sys_sigblock(ERTS_SYS_SUSPEND_SIGNAL);
-#endif
-
-}
-
-static void unblock_signals(void)
-{
-    /* Update erl_child_setup.c if changed */
-#if !CHLDWTHR
-   sys_sigrelease(SIGCHLD);
-#endif
-#ifndef ERTS_SMP
-   sys_sigrelease(SIGINT);
-#ifndef ETHR_UNUSABLE_SIGUSRX
-   sys_sigrelease(SIGUSR1);
-#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
-#endif /* #ifndef ERTS_SMP */
-
-#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
-   sys_sigrelease(ERTS_SYS_SUSPEND_SIGNAL);
-#endif
-
-}
-
 /************************** OS info *******************************/
 
 /* Used by erlang:info/1. */
@@ -1104,1502 +870,6 @@ void fini_getenv_state(GETENV_STATE *state)
    erts_smp_rwmtx_runlock(&environ_rwmtx);
 }
 
-
-/************************** Port I/O *******************************/
-
-
-
-/* I. Common stuff */
-
-/*
- * Decreasing the size of it below 16384 is not allowed.
- */
-
-/* II. The spawn/fd/vanilla drivers */
-
-#define ERTS_SYS_READ_BUF_SZ (64*1024)
-
-/* Driver interfaces */
-static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
-static ErlDrvData fd_start(ErlDrvPort, char*, SysDriverOpts*);
-#if FDBLOCK
-static void fd_async(void *);
-static void fd_ready_async(ErlDrvData drv_data, ErlDrvThreadData thread_data);
-#endif
-static ErlDrvSSizeT fd_control(ErlDrvData, unsigned int, char *, ErlDrvSizeT,
-			       char **, ErlDrvSizeT);
-static ErlDrvData vanilla_start(ErlDrvPort, char*, SysDriverOpts*);
-static int spawn_init(void);
-static void fd_stop(ErlDrvData);
-static void fd_flush(ErlDrvData);
-static void stop(ErlDrvData);
-static void ready_input(ErlDrvData, ErlDrvEvent);
-static void ready_output(ErlDrvData, ErlDrvEvent);
-static void output(ErlDrvData, char*, ErlDrvSizeT);
-static void outputv(ErlDrvData, ErlIOVec*);
-static void stop_select(ErlDrvEvent, void*);
-
-struct erl_drv_entry spawn_driver_entry = {
-    spawn_init,
-    spawn_start,
-    stop,
-    output,
-    ready_input,
-    ready_output,
-    "spawn",
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    ERL_DRV_EXTENDED_MARKER,
-    ERL_DRV_EXTENDED_MAJOR_VERSION,
-    ERL_DRV_EXTENDED_MINOR_VERSION,
-    ERL_DRV_FLAG_USE_PORT_LOCKING,
-    NULL, NULL,
-    stop_select
-};
-struct erl_drv_entry fd_driver_entry = {
-    NULL,
-    fd_start,
-    fd_stop,
-    output,
-    ready_input,
-    ready_output, 
-    "fd",
-    NULL,
-    NULL,
-    fd_control,
-    NULL,
-    outputv,
-#if FDBLOCK
-    fd_ready_async, /* ready_async */
-#else
-    NULL,
-#endif
-    fd_flush, /* flush */
-    NULL, /* call */
-    NULL, /* event */
-    ERL_DRV_EXTENDED_MARKER,
-    ERL_DRV_EXTENDED_MAJOR_VERSION,
-    ERL_DRV_EXTENDED_MINOR_VERSION,
-    0, /* ERL_DRV_FLAGs */
-    NULL, /* handle2 */
-    NULL, /* process_exit */
-    stop_select
-};
-struct erl_drv_entry vanilla_driver_entry = {
-    NULL,
-    vanilla_start,
-    stop,
-    output,
-    ready_input,
-    ready_output,
-    "vanilla",
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL, /* flush */
-    NULL, /* call */
-    NULL, /* event */
-    ERL_DRV_EXTENDED_MARKER,
-    ERL_DRV_EXTENDED_MAJOR_VERSION,
-    ERL_DRV_EXTENDED_MINOR_VERSION,
-    0, /* ERL_DRV_FLAGs */
-    NULL, /* handle2 */
-    NULL, /* process_exit */
-    stop_select
-};
-
-/* Handle SIGCHLD signals. */
-#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
-static RETSIGTYPE onchld(void)
-#else
-static RETSIGTYPE onchld(int signum)
-#endif
-{
-#if CHLDWTHR
-    ASSERT(0); /* We should *never* catch a SIGCHLD signal */
-#elif defined(ERTS_SMP)
-    smp_sig_notify('C');
-#else
-    children_died = 1;
-    ERTS_CHK_IO_AS_INTR(); /* Make sure we don't sleep in poll */
-#endif
-}
-
-static int set_blocking_data(ErtsSysDriverData *dd) {
-
-    dd->blocking = erts_alloc(ERTS_ALC_T_SYS_BLOCKING, sizeof(ErtsSysBlocking));
-
-    erts_smp_atomic_add_nob(&sys_misc_mem_sz, sizeof(ErtsSysBlocking));
-
-    dd->blocking->pdl = driver_pdl_create(dd->port_num);
-    dd->blocking->res = 0;
-    dd->blocking->err = 0;
-    dd->blocking->pkey = driver_async_port_key(dd->port_num);
-
-    return 1;
-}
-
-static int set_driver_data(ErlDrvPort port_num,
-			   int ifd,
-			   int ofd,
-			   int packet_bytes,
-			   int read_write,
-			   int exit_status,
-			   int pid,
-                           int is_blocking)
-{
-    Port *prt;
-    ErtsSysReportExit *report_exit;
-
-    if (!exit_status)
-	report_exit = NULL;
-    else {
-	report_exit = erts_alloc(ERTS_ALC_T_PRT_REP_EXIT,
-				 sizeof(ErtsSysReportExit));
-	report_exit->next = report_exit_list;
-	report_exit->port = erts_drvport2id(port_num);
-	report_exit->pid = pid;
-	report_exit->ifd = read_write & DO_READ ? ifd : -1;
-	report_exit->ofd = read_write & DO_WRITE ? ofd : -1;
-#if CHLDWTHR && !defined(ERTS_SMP)
-	report_exit->status = 0;
-#endif
-	report_exit_list = report_exit;
-    }
-
-    prt = erts_drvport2port(port_num);
-    if (prt != ERTS_INVALID_ERL_DRV_PORT)
-	prt->os_pid = pid;
-
-    if (read_write & DO_READ) {
-	driver_data[ifd].packet_bytes = packet_bytes;
-	driver_data[ifd].port_num = port_num;
-	driver_data[ifd].report_exit = report_exit;
-	driver_data[ifd].pid = pid;
-	driver_data[ifd].alive = 1;
-	driver_data[ifd].status = 0;
-        driver_data[ifd].terminating = 0;
-        driver_data[ifd].blocking = NULL;
-	if (read_write & DO_WRITE) {
-	    driver_data[ifd].ofd = ofd;
-            if (is_blocking && FDBLOCK)
-                if (!set_blocking_data(driver_data+ifd))
-                    return -1;
-	    if (ifd != ofd)
-		driver_data[ofd] = driver_data[ifd];  /* structure copy */
-	} else {		/* DO_READ only */
-	    driver_data[ifd].ofd = -1;
-	}
-	(void) driver_select(port_num, ifd, (ERL_DRV_READ|ERL_DRV_USE), 1);
-	return(ifd);
-    } else {			/* DO_WRITE only */
-	driver_data[ofd].packet_bytes = packet_bytes;
-	driver_data[ofd].port_num = port_num;
-	driver_data[ofd].report_exit = report_exit;
-	driver_data[ofd].ofd = ofd;
-	driver_data[ofd].pid = pid;
-	driver_data[ofd].alive = 1;
-	driver_data[ofd].status = 0;
-        driver_data[ofd].terminating = 0;
-        driver_data[ofd].blocking = NULL;
-        if (is_blocking && FDBLOCK)
-            if (!set_blocking_data(driver_data+ofd))
-                return -1;
-	return(ofd);
-    }
-}
-
-static int spawn_init()
-{
-   int i;
-#if CHLDWTHR
-   erts_thr_opts_t thr_opts = ERTS_THR_OPTS_DEFAULT_INITER;
-
-   thr_opts.detached = 0;
-   thr_opts.suggested_stack_size = 0; /* Smallest possible */
-   thr_opts.name = "child_waiter";
-#endif
-
-   sys_signal(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
-   driver_data = (ErtsSysDriverData *)
-       erts_alloc(ERTS_ALC_T_DRV_TAB, max_files * sizeof(ErtsSysDriverData));
-   erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-			   max_files * sizeof(ErtsSysDriverData));
-
-   for (i = 0; i < max_files; i++)
-      driver_data[i].pid = -1;
-
-#if CHLDWTHR
-   sys_sigblock(SIGCHLD);
-#endif
-
-   sys_signal(SIGCHLD, onchld); /* Reap children */
-
-#if CHLDWTHR
-   erts_thr_create(&child_waiter_tid, child_waiter, NULL, &thr_opts);
-#endif
-
-   return 1;
-}
-
-static void close_pipes(int ifd[2], int ofd[2], int read_write)
-{
-    if (read_write & DO_READ) {
-	(void) close(ifd[0]);
-	(void) close(ifd[1]);
-    }
-    if (read_write & DO_WRITE) {
-	(void) close(ofd[0]);
-	(void) close(ofd[1]);
-    }
-}
-
-static void init_fd_data(int fd, ErlDrvPort port_num)
-{
-    fd_data[fd].buf = NULL;
-    fd_data[fd].cpos = NULL;
-    fd_data[fd].remain = 0;
-    fd_data[fd].sz = 0;
-    fd_data[fd].psz = 0;
-}
-
-static char **build_unix_environment(char *block)
-{
-    int i;
-    int j;
-    int len;
-    char *cp;
-    char **cpp;
-    char** old_env;
-    
-    ERTS_SMP_LC_ASSERT(erts_smp_lc_rwmtx_is_rlocked(&environ_rwmtx));
-
-    cp = block;
-    len = 0;
-    while (*cp != '\0') {
-	cp += strlen(cp) + 1;
-	len++;
-    }
-    old_env = environ;
-    while (*old_env++ != NULL) {
-	len++;
-    }
-    
-    cpp = (char **) erts_alloc_fnf(ERTS_ALC_T_ENVIRONMENT,
-				   sizeof(char *) * (len+1));
-    if (cpp == NULL) {
-	return NULL;
-    }
-
-    cp = block;
-    len = 0;
-    while (*cp != '\0') {
-	cpp[len] = cp;
-	cp += strlen(cp) + 1;
-	len++;
-    }
-    
-    i = len;
-    for (old_env = environ; *old_env; old_env++) {
-	char* old = *old_env;
-
-	for (j = 0; j < len; j++) {
-	    char *s, *t;
-
-	    s = cpp[j];
-	    t = old;
-	    while (*s == *t && *s != '=') {
-		s++, t++;
-	    }
-	    if (*s == '=' && *t == '=') {
-		break;
-	    }
-	}
-
-	if (j == len) {		/* New version not found */
-	    cpp[len++] = old;
-	}
-    }
-
-    for (j = 0; j < i; ) {
-        size_t last = strlen(cpp[j])-1;
-	if (cpp[j][last] == '=' && strchr(cpp[j], '=') == cpp[j]+last) {
-	    cpp[j] = cpp[--len];
-	    if (len < i) {
-		i--;
-	    } else {
-		j++;
-	    }
-	}
-	else {
-	    j++;
-	}
-    }
-
-    cpp[len] = NULL;
-    return cpp;
-}
-
-/*
-  [arndt] In most Unix systems, including Solaris 2.5, 'fork' allocates memory
-  in swap space for the child of a 'fork', whereas 'vfork' does not do this.
-  The natural call to use here is therefore 'vfork'. Due to a bug in
-  'vfork' in Solaris 2.5 (apparently fixed in 2.6), using 'vfork'
-  can be dangerous in what seems to be these circumstances:
-      If the child code under a vfork sets the signal action to SIG_DFL
-      (or SIG_IGN)
-      for any signal which was previously set to a signal handler, the
-      state of the parent is clobbered, so that the later arrival of
-      such a signal yields a sigsegv in the parent. If the signal was
-      not set to a signal handler, but ignored, all seems to work.
-  If you change the forking code below, beware of this.
- */
-
-static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* opts)
-{
-#define CMD_LINE_PREFIX_STR "exec "
-#define CMD_LINE_PREFIX_STR_SZ (sizeof(CMD_LINE_PREFIX_STR) - 1)
-
-    int ifd[2], ofd[2], len, pid, i;
-    char **volatile new_environ; /* volatile since a vfork() then cannot
-				    cause 'new_environ' to be clobbered
-				    in the parent process. */
-    int saved_errno;
-    long res;
-    char *cmd_line;
-#ifndef QNX
-    int unbind;
-#endif
-#if !DISABLE_VFORK
-    int no_vfork;
-    size_t no_vfork_sz = sizeof(no_vfork);
-
-    no_vfork = (erts_sys_getenv_raw("ERL_NO_VFORK",
-				    (char *) &no_vfork,
-				    &no_vfork_sz) >= 0);
-#endif
-
-    switch (opts->read_write) {
-    case DO_READ:
-	if (pipe(ifd) < 0)
-	    return ERL_DRV_ERROR_ERRNO;
-	if (ifd[0] >= max_files) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = EMFILE;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	ofd[1] = -1;		/* keep purify happy */
-	break;
-    case DO_WRITE:
-	if (pipe(ofd) < 0) return ERL_DRV_ERROR_ERRNO;
-	if (ofd[1] >= max_files) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = EMFILE;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	ifd[0] = -1;		/* keep purify happy */
-	break;
-    case DO_READ|DO_WRITE:
-	if (pipe(ifd) < 0) return ERL_DRV_ERROR_ERRNO;
-	errno = EMFILE;		/* default for next two conditions */
-	if (ifd[0] >= max_files || pipe(ofd) < 0) {
-	    close_pipes(ifd, ofd, DO_READ);
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	if (ofd[1] >= max_files) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = EMFILE;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	break;
-    default:
-	ASSERT(0);
-	return ERL_DRV_ERROR_GENERAL;
-    }
-
-    if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
-	/* started with spawn_executable, not with spawn */
-	len = strlen(name);
-	cmd_line = (char *) erts_alloc_fnf(ERTS_ALC_T_TMP, len + 1);
-	if (!cmd_line) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = ENOMEM;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	memcpy((void *) cmd_line,(void *) name, len);
-	cmd_line[len] = '\0';
-	if (access(cmd_line,X_OK) != 0) {
-	    int save_errno = errno;
-	    erts_free(ERTS_ALC_T_TMP, cmd_line);
-	    errno = save_errno;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-    } else {
-	/* make the string suitable for giving to "sh" */
-	len = strlen(name);
-	cmd_line = (char *) erts_alloc_fnf(ERTS_ALC_T_TMP,
-					   CMD_LINE_PREFIX_STR_SZ + len + 1);
-	if (!cmd_line) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = ENOMEM;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	memcpy((void *) cmd_line,
-	       (void *) CMD_LINE_PREFIX_STR,
-	       CMD_LINE_PREFIX_STR_SZ);
-	memcpy((void *) (cmd_line + CMD_LINE_PREFIX_STR_SZ), (void *) name, len);
-	cmd_line[CMD_LINE_PREFIX_STR_SZ + len] = '\0';
-    }
-
-    erts_smp_rwmtx_rlock(&environ_rwmtx);
-
-    if (opts->envir == NULL) {
-	new_environ = environ;
-    } else if ((new_environ = build_unix_environment(opts->envir)) == NULL) {
-	erts_smp_rwmtx_runlock(&environ_rwmtx);
-	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
-	errno = ENOMEM;
-	return ERL_DRV_ERROR_ERRNO;
-    } 
-
-#ifndef QNX
-    /* Block child from SIGINT and SIGUSR1. Must be before fork()
-       to be safe. */
-    block_signals();
-
-    CHLD_STAT_LOCK;
-
-    unbind = erts_sched_bind_atfork_prepare();
-
-#if !DISABLE_VFORK
-    /* See fork/vfork discussion before this function. */
-    if (no_vfork) {
-#endif
-
-	DEBUGF(("Using fork\n"));
-	pid = fork();
-
-	if (pid == 0) {
-	    /* The child! Setup child... */
-
-	    if (erts_sched_bind_atfork_child(unbind) != 0)
-		goto child_error;
-
-	    /* OBSERVE!
-	     * Keep child setup after vfork() (implemented below and in
-	     * erl_child_setup.c) up to date if changes are made here.
-	     */
-
-	    if (opts->use_stdio) {
-		if (opts->read_write & DO_READ) {
-		    /* stdout for process */
-		    if (dup2(ifd[1], 1) < 0)
-			goto child_error;
-		    if(opts->redir_stderr)
-			/* stderr for process */
-			if (dup2(ifd[1], 2) < 0)
-			    goto child_error;
-		}
-		if (opts->read_write & DO_WRITE)
-		    /* stdin for process */
-		    if (dup2(ofd[0], 0) < 0)
-			goto child_error;
-	    }
-	    else {	/* XXX will fail if ofd[0] == 4 (unlikely..) */
-		if (opts->read_write & DO_READ)
-		    if (dup2(ifd[1], 4) < 0)
-			goto child_error;
-		if (opts->read_write & DO_WRITE)
-		    if (dup2(ofd[0], 3) < 0)
-			goto child_error;
-	    }
-
-#if defined(HAVE_CLOSEFROM)
-	    closefrom(opts->use_stdio ? 3 : 5);
-#else
-	    for (i = opts->use_stdio ? 3 : 5; i < max_files; i++)
-		(void) close(i);
-#endif
-
-	    if (opts->wd && chdir(opts->wd) < 0)
-		goto child_error;
-
-#if defined(USE_SETPGRP_NOARGS)		/* SysV */
-	    (void) setpgrp();
-#elif defined(USE_SETPGRP)		/* BSD */
-	    (void) setpgrp(0, getpid());
-#else					/* POSIX */
-	    (void) setsid();
-#endif
-	    
-	    unblock_signals();
-
-	    if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
-		if (opts->argv == NULL) {
-		    execle(cmd_line,cmd_line,(char *) NULL, new_environ);
-		} else {
-		    if (opts->argv[0] == erts_default_arg0) {
-			opts->argv[0] = cmd_line;
-		    }
-		    execve(cmd_line, opts->argv, new_environ);
-		    if (opts->argv[0] == cmd_line) {
-			opts->argv[0] = erts_default_arg0;
-		    }
-		}
-	    } else {
-		execle(SHELL, "sh", "-c", cmd_line, (char *) NULL, new_environ);
-	    }
-	child_error:
-	    _exit(1);
-	}
-#if !DISABLE_VFORK
-    }
-#define ENOUGH_BYTES (44)
-    else { /* Use vfork() */
-	char **cs_argv= erts_alloc(ERTS_ALC_T_TMP,(CS_ARGV_NO_OF_ARGS + 1)*
-				   sizeof(char *));
-	char fd_close_range[ENOUGH_BYTES];                  /* 44 bytes are enough to  */
-	char dup2_op[CS_ARGV_NO_OF_DUP2_OPS][ENOUGH_BYTES]; /* hold any "%d:%d" string */
-                                                            /* on a 64-bit machine.    */
-
-	/* Setup argv[] for the child setup program (implemented in
-	   erl_child_setup.c) */
-	i = 0;
-	if (opts->use_stdio) {
-	    if (opts->read_write & DO_READ){
-		/* stdout for process */
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 1);
-		if(opts->redir_stderr)
-		    /* stderr for process */
-		    erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 2);
-	    }
-	    if (opts->read_write & DO_WRITE)
-		/* stdin for process */
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ofd[0], 0);
-	} else {	/* XXX will fail if ofd[0] == 4 (unlikely..) */
-	    if (opts->read_write & DO_READ)
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 4);
-	    if (opts->read_write & DO_WRITE)
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ofd[0], 3);
-	}
-	for (; i < CS_ARGV_NO_OF_DUP2_OPS; i++)
-	    strcpy(&dup2_op[i][0], "-");
-	erts_snprintf(fd_close_range, ENOUGH_BYTES, "%d:%d", opts->use_stdio ? 3 : 5, max_files-1);
-
-	cs_argv[CS_ARGV_PROGNAME_IX] = child_setup_prog;
-	cs_argv[CS_ARGV_WD_IX] = opts->wd ? opts->wd : ".";
-	cs_argv[CS_ARGV_UNBIND_IX] = erts_sched_bind_atvfork_child(unbind);
-	cs_argv[CS_ARGV_FD_CR_IX] = fd_close_range;
-	for (i = 0; i < CS_ARGV_NO_OF_DUP2_OPS; i++)
-	    cs_argv[CS_ARGV_DUP2_OP_IX(i)] = &dup2_op[i][0];
-
-	if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
-	    int num = 0;
-	    int j = 0;
-	    if (opts->argv != NULL) {
-		for(; opts->argv[num] != NULL; ++num)
-		    ;
-	    }
-	    cs_argv = erts_realloc(ERTS_ALC_T_TMP,cs_argv, (CS_ARGV_NO_OF_ARGS + 1 + num + 1) * sizeof(char *));
-	    cs_argv[CS_ARGV_CMD_IX] = "-";
-	    cs_argv[CS_ARGV_NO_OF_ARGS] = cmd_line;
-	    if (opts->argv != NULL) {
-		for (;opts->argv[j] != NULL; ++j) {
-		    if (opts->argv[j] == erts_default_arg0) {
-			cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = cmd_line;
-		    } else {
-			cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = opts->argv[j];
-		    }
-		}
-	    }
-	    cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = NULL;
-	} else {
-	    cs_argv[CS_ARGV_CMD_IX] = cmd_line; /* Command */
-	    cs_argv[CS_ARGV_NO_OF_ARGS] = NULL;
-	}
-	DEBUGF(("Using vfork\n"));
-	pid = vfork();
-
-	if (pid == 0) {
-	    /* The child! */
-
-	    /* Observe!
-	     * OTP-4389: The child setup program (implemented in
-	     * erl_child_setup.c) will perform the necessary setup of the
-	     * child before it execs to the user program. This because
-	     * vfork() only allow an *immediate* execve() or _exit() in the
-	     * child.
-	     */
-	    execve(child_setup_prog, cs_argv, new_environ);
-	    _exit(1);
-	}
-	erts_free(ERTS_ALC_T_TMP,cs_argv);
-    }
-#undef ENOUGH_BYTES
-#endif
-
-    erts_sched_bind_atfork_parent(unbind);
-
-    if (pid == -1) {
-        saved_errno = errno;
-	CHLD_STAT_UNLOCK;
-	erts_smp_rwmtx_runlock(&environ_rwmtx);
-	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
-        unblock_signals();
-        close_pipes(ifd, ofd, opts->read_write);
-	errno = saved_errno;
-	return ERL_DRV_ERROR_ERRNO;
-    }
-#else /* QNX */
-    if (opts->use_stdio) {
-	if (opts->read_write & DO_READ)
-	    qnx_spawn_options.iov[1] = ifd[1];  /* stdout for process */
-	if (opts->read_write & DO_WRITE)
-	    qnx_spawn_options.iov[0] = ofd[0];  /* stdin for process */
-	} 
-    else {
-	if (opts->read_write & DO_READ)
-	    qnx_spawn_options.iov[4] = ifd[1];
-	if (opts->read_write & DO_WRITE)
-	    qnx_spawn_options.iov[3] = ofd[0];
-    }
-    /* Close fds on exec */
-    for (i = 3; i < max_files; i++)
-	fcntl(i, F_SETFD, 1);
-
-    qnx_spawn_options.flags = _SPAWN_SETSID;
-    if ((pid = spawnl(P_NOWAIT, SHELL, SHELL, "-c", cmd_line, 
-                      (char *) 0)) < 0) {
-	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
-        reset_qnx_spawn();
-	erts_smp_rwmtx_runlock(&environ_rwmtx);
-	close_pipes(ifd, ofd, opts->read_write);
-	return ERL_DRV_ERROR_GENERAL;
-    }
-    reset_qnx_spawn();
-#endif /* QNX */
-
-    erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
-
-    if (new_environ != environ)
-	erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
-
-    if (opts->read_write & DO_READ) 
-	(void) close(ifd[1]);
-    if (opts->read_write & DO_WRITE)
-	(void) close(ofd[0]);
-	
-    if (opts->read_write & DO_READ) {
-	SET_NONBLOCKING(ifd[0]);
-	init_fd_data(ifd[0], port_num);
-    }
-    if (opts->read_write & DO_WRITE) {
-	SET_NONBLOCKING(ofd[1]);
-        init_fd_data(ofd[1], port_num);
-    }
-
-    res = set_driver_data(port_num, ifd[0], ofd[1], opts->packet_bytes,
-			  opts->read_write, opts->exit_status, pid, 0);
-    /* Don't unblock SIGCHLD until now, since the call above must
-       first complete putting away the info about our new subprocess. */
-    unblock_signals();
-
-#if CHLDWTHR
-    ASSERT(children_alive >= 0);
-
-    if (!(children_alive++))
-	CHLD_STAT_SIGNAL; /* Wake up child waiter thread if no children
-			     was alive before we fork()ed ... */
-#endif
-    /* Don't unlock chld_stat_mtx until now of the same reason as above */
-    CHLD_STAT_UNLOCK;
-
-    erts_smp_rwmtx_runlock(&environ_rwmtx);
-
-    return (ErlDrvData)res;
-#undef CMD_LINE_PREFIX_STR
-#undef CMD_LINE_PREFIX_STR_SZ
-}
-
-#ifdef QNX
-static reset_qnx_spawn()
-{
-    int i;
-
-    /* Reset qnx_spawn_options */
-    qnx_spawn_options.flags = 0; 
-    qnx_spawn_options.iov[0] = 0xff;
-    qnx_spawn_options.iov[1] = 0xff;
-    qnx_spawn_options.iov[2] = 0xff;
-    qnx_spawn_options.iov[3] = 0xff;
-}
-#endif
-
-#define FD_DEF_HEIGHT 24
-#define FD_DEF_WIDTH 80
-/* Control op */
-#define FD_CTRL_OP_GET_WINSIZE 100
-
-static int fd_get_window_size(int fd, Uint32 *width, Uint32 *height)
-{
-#ifdef TIOCGWINSZ 
-    struct winsize ws;
-    if (ioctl(fd,TIOCGWINSZ,&ws) == 0) {
-	*width = (Uint32) ws.ws_col;
-	*height = (Uint32) ws.ws_row;
-	return 0;
-    }
-#endif
-    return -1;
-}
-
-static ErlDrvSSizeT fd_control(ErlDrvData drv_data,
-			       unsigned int command,
-			       char *buf, ErlDrvSizeT len,
-			       char **rbuf, ErlDrvSizeT rlen)
-{
-    int fd = (int)(long)drv_data;
-    char resbuff[2*sizeof(Uint32)];
-    switch (command) {
-    case FD_CTRL_OP_GET_WINSIZE:
-	{
-	    Uint32 w,h;
-	    if (fd_get_window_size(fd,&w,&h)) 
-		return 0;
-	    memcpy(resbuff,&w,sizeof(Uint32));
-	    memcpy(resbuff+sizeof(Uint32),&h,sizeof(Uint32));
-	}
-	break;
-    default:
-	return 0;
-    }
-    if (rlen < 2*sizeof(Uint32)) {
-	*rbuf = driver_alloc(2*sizeof(Uint32));
-    }
-    memcpy(*rbuf,resbuff,2*sizeof(Uint32));
-    return 2*sizeof(Uint32);
-}
-
-static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
-			   SysDriverOpts* opts)
-{
-    ErlDrvData res;
-    int non_blocking = 0;
-
-    if (((opts->read_write & DO_READ) && opts->ifd >= max_files) ||
-	((opts->read_write & DO_WRITE) && opts->ofd >= max_files))
-	return ERL_DRV_ERROR_GENERAL;
-
-    /*
-     * Historical:
-     *
-     * "Note about nonblocking I/O.
-     *
-     * At least on Solaris, setting the write end of a TTY to nonblocking,
-     * will set the input end to nonblocking as well (and vice-versa).
-     * If erl is run in a pipeline like this:  cat | erl
-     * the input end of the TTY will be the standard input of cat.
-     * And cat is not prepared to handle nonblocking I/O."
-     *
-     * Actually, the reason for this is not that the tty itself gets set
-     * in non-blocking mode, but that the "input end" (cat's stdin) and
-     * the "output end" (erlang's stdout) are typically the "same" file
-     * descriptor, dup()'ed from a single fd by one of this process'
-     * ancestors.
-     *
-     * The workaround for this problem used to be a rather bad kludge,
-     * interposing an extra process ("internal cat") between erlang's
-     * stdout and the original stdout, allowing erlang to set its stdout
-     * in non-blocking mode without affecting the stdin of the preceding
-     * process in the pipeline - and being a kludge, it caused all kinds
-     * of weird problems.
-     *
-     * So, this is the current logic:
-     *
-     * The only reason to set non-blocking mode on the output fd at all is
-     * if it's something that can cause a write() to block, of course,
-     * i.e. primarily if it points to a tty, socket, pipe, or fifo. 
-     *
-     * If we don't set non-blocking mode when we "should" have, and output
-     * becomes blocked, the entire runtime system will be suspended - this
-     * is normally bad of course, and can happen fairly "easily" - e.g. user
-     * hits ^S on tty - but doesn't necessarily happen.
-     * 
-     * If we do set non-blocking mode when we "shouldn't" have, the runtime
-     * system will end up seeing EOF on the input fd (due to the preceding
-     * process dying), which typically will cause the entire runtime system
-     * to terminate immediately (due to whatever erlang process is seeing
-     * the EOF taking it as a signal to halt the system). This is *very* bad.
-     * 
-     * I.e. we should take a conservative approach, and only set non-
-     * blocking mode when we a) need to, and b) are reasonably certain
-     * that it won't be a problem. And as in the example above, the problem
-     * occurs when input fd and output fd point to different "things".
-     *
-     * However, determining that they are not just the same "type" of
-     * "thing", but actually the same instance of that type of thing, is
-     * unreasonably complex in many/most cases.
-     *
-     * Also, with pipes, sockets, and fifos it's far from obvious that the
-     * user *wants* non-blocking output: If you're running erlang inside
-     * some complex pipeline, you're probably not running a real-time system
-     * that must never stop, but rather *want* it to suspend if the output
-     * channel is "full".
-     *
-     * So, the bottom line: We will only set the output fd non-blocking if
-     * it points to a tty, and either a) the input fd also points to a tty,
-     * or b) we can make sure that setting the output fd non-blocking
-     * doesn't interfere with someone else's input, via a somewhat milder
-     * kludge than the above.
-     *
-     * Also keep in mind that while this code is almost exclusively run as
-     * a result of an erlang open_port({fd,0,1}, ...), that isn't the only
-     * case - it can be called with any old pre-existing file descriptors,
-     * the relations between which (if they're even two) we can only guess
-     * at - still, we try our best...
-     *
-     * Added note OTP 18: Some systems seem to use stdout/stderr to log data
-     * using unix pipes, so we cannot allow the system to block on a write.
-     * Therefore we use an async thread to write the data to fd's that could
-     * not be set to non-blocking. When no async threads are available we
-     * fall back on the old behaviour.
-     *
-     * Also the guarantee about what is delivered to the OS has changed.
-     * Pre 18 the fd driver did no flushing of data before terminating.
-     * Now it does. This is because we want to be able to guarantee that things
-     * such as escripts and friends really have outputted all data before
-     * terminating. This could potentially block the termination of the system
-     * for a very long time, but if the user wants to terminate fast she should
-     * use erlang:halt with flush=false.
-     */
-
-    if (opts->read_write & DO_READ) {
-	init_fd_data(opts->ifd, port_num);
-    }
-    if (opts->read_write & DO_WRITE) {
-	init_fd_data(opts->ofd, port_num);
-
-	/* If we don't have a read end, all bets are off - no non-blocking. */
-	if (opts->read_write & DO_READ) {
-
-	    if (isatty(opts->ofd)) { /* output fd is a tty:-) */
-
-		if (isatty(opts->ifd)) { /* input fd is also a tty */
-
-		    /* To really do this "right", we should also check that
-		       input and output fd point to the *same* tty - but
-		       this seems like overkill; ttyname() isn't for free,
-		       and this is a very common case - and it's hard to
-		       imagine a scenario where setting non-blocking mode
-		       here would cause problems - go ahead and do it. */
-
-                    non_blocking = 1;
-		    SET_NONBLOCKING(opts->ofd);
-
-		} else {	/* output fd is a tty, input fd isn't */
-
-		    /* This is a "problem case", but also common (see the
-		       example above) - i.e. it makes sense to try a bit
-		       harder before giving up on non-blocking mode: Try to
-		       re-open the tty that the output fd points to, and if
-		       successful replace the original one with the "new" fd
-		       obtained this way, and set *that* one in non-blocking
-		       mode. (Yes, this is a kludge.)
-
-		       However, re-opening the tty may fail in a couple of
-		       (unusual) cases:
-
-		       1) The name of the tty (or an equivalent one, i.e.
-			  same major/minor number) can't be found, because
-			  it actually lives somewhere other than /dev (or
-			  wherever ttyname() looks for it), and isn't
-			  equivalent to any of those that do live in the
-			  "standard" place - this should be *very* unusual.
-
-		       2) Permissions on the tty don't allow us to open it -
-			  it's perfectly possible to have an fd open to an
-			  object whose permissions wouldn't allow us to open
-			  it. This is not as unusual as it sounds, one case
-			  is if the user has su'ed to someone else (not
-			  root) - we have a read/write fd open to the tty
-			  (because it has been inherited all the way down
-			  here), but we have neither read nor write
-			  permission for the tty.
-
-		       In these cases, we finally give up, and don't set the
-		       output fd in non-blocking mode. */
-
-		    char *tty;
-		    int nfd;
-
-		    if ((tty = ttyname(opts->ofd)) != NULL &&
-			(nfd = open(tty, O_WRONLY)) != -1) {
-			dup2(nfd, opts->ofd);
-			close(nfd);
-                        non_blocking = 1;
-			SET_NONBLOCKING(opts->ofd);
-		    }
-		}
-	    }
-	}
-    }
-    CHLD_STAT_LOCK;
-    res = (ErlDrvData)(long)set_driver_data(port_num, opts->ifd, opts->ofd,
-                                            opts->packet_bytes,
-                                            opts->read_write, 0, -1,
-                                            !non_blocking);
-    CHLD_STAT_UNLOCK;
-    return res;
-}
-
-static void clear_fd_data(int fd) 
-{
-    if (fd_data[fd].sz > 0) {
-	erts_free(ERTS_ALC_T_FD_ENTRY_BUF, (void *) fd_data[fd].buf);
-	ASSERT(erts_smp_atomic_read_nob(&sys_misc_mem_sz) >= fd_data[fd].sz);
-	erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*fd_data[fd].sz);
-    }
-    fd_data[fd].buf = NULL;
-    fd_data[fd].sz = 0;
-    fd_data[fd].remain = 0;
-    fd_data[fd].cpos = NULL;
-    fd_data[fd].psz = 0;
-}
-
-static void nbio_stop_fd(ErlDrvPort prt, int fd)
-{
-    driver_select(prt,fd,DO_READ|DO_WRITE,0);
-    clear_fd_data(fd);
-    SET_BLOCKING(fd);
-}
-
-static void fd_stop(ErlDrvData ev)  /* Does not close the fds */
-{
-    int ofd;
-    int fd = (int)(long)ev;
-    ErlDrvPort prt = driver_data[fd].port_num;
-    
-#if FDBLOCK
-    if (driver_data[fd].blocking) {
-        erts_free(ERTS_ALC_T_SYS_BLOCKING,driver_data[fd].blocking);
-        driver_data[fd].blocking = NULL;
-        erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*sizeof(ErtsSysBlocking));
-    }
-#endif
-
-    nbio_stop_fd(prt, fd);
-    ofd = driver_data[fd].ofd;
-    if (ofd != fd && ofd != -1)
-	nbio_stop_fd(prt, ofd);
-}
-
-static void fd_flush(ErlDrvData fd)
-{
-    if (!driver_data[(int)(long)fd].terminating)
-        driver_data[(int)(long)fd].terminating = 1;
-}
-
-static ErlDrvData vanilla_start(ErlDrvPort port_num, char* name,
-				SysDriverOpts* opts)
-{
-    int flags, fd;
-    ErlDrvData res;
-
-    flags = (opts->read_write == DO_READ ? O_RDONLY :
-	     opts->read_write == DO_WRITE ? O_WRONLY|O_CREAT|O_TRUNC :
-	     O_RDWR|O_CREAT);
-    if ((fd = open(name, flags, 0666)) < 0)
-	return ERL_DRV_ERROR_GENERAL;
-    if (fd >= max_files) {
-	close(fd);
-	return ERL_DRV_ERROR_GENERAL;
-    }
-    SET_NONBLOCKING(fd);
-    init_fd_data(fd, port_num);
-
-    CHLD_STAT_LOCK;
-    res = (ErlDrvData)(long)set_driver_data(port_num, fd, fd,
-                                            opts->packet_bytes,
-                                            opts->read_write, 0, -1, 0);
-    CHLD_STAT_UNLOCK;
-    return res;
-}
-
-/* Note that driver_data[fd].ifd == fd if the port was opened for reading, */
-/* otherwise (i.e. write only) driver_data[fd].ofd = fd.  */
-
-static void stop(ErlDrvData fd)
-{
-    ErlDrvPort prt;
-    int ofd;
-
-    prt = driver_data[(int)(long)fd].port_num;
-    nbio_stop_fd(prt, (int)(long)fd);
-
-    ofd = driver_data[(int)(long)fd].ofd;
-    if (ofd != (int)(long)fd && (int)(long)ofd != -1)
-	nbio_stop_fd(prt, ofd);
-    else
-	ofd = -1;
-
-    CHLD_STAT_LOCK;
-
-    /* Mark as unused. */
-    driver_data[(int)(long)fd].pid = -1;
-
-    CHLD_STAT_UNLOCK;
-
-    /* SMP note: Close has to be last thing done (open file descriptors work
-       as locks on driver_data[] entries) */
-    driver_select(prt, (int)(long)fd, ERL_DRV_USE, 0);  /* close(fd); */
-    if (ofd >= 0) {
-	driver_select(prt, (int)(long)ofd, ERL_DRV_USE, 0);  /* close(ofd); */
-    }
-}
-
-/* used by fd_driver */
-static void outputv(ErlDrvData e, ErlIOVec* ev)
-{
-    int fd = (int)(long)e;
-    ErlDrvPort ix = driver_data[fd].port_num;
-    int pb = driver_data[fd].packet_bytes;
-    int ofd = driver_data[fd].ofd;
-    ssize_t n;
-    ErlDrvSizeT sz;
-    char lb[4];
-    char* lbp;
-    ErlDrvSizeT len = ev->size;
-
-    /* (len > ((unsigned long)-1 >> (4-pb)*8)) */
-    /*    if (pb >= 0 && (len & (((ErlDrvSizeT)1 << (pb*8))) - 1) != len) {*/
-    if (((pb == 2) && (len > 0xffff)) || (pb == 1 && len > 0xff)) {
-	driver_failure_posix(ix, EINVAL);
-	return; /* -1; */
-    }
-    /* Handles 0 <= pb <= 4 only */
-    put_int32((Uint32) len, lb);
-    lbp = lb + (4-pb);
-
-    ev->iov[0].iov_base = lbp;
-    ev->iov[0].iov_len = pb;
-    ev->size += pb;
-
-    if (driver_data[fd].blocking && FDBLOCK)
-        driver_pdl_lock(driver_data[fd].blocking->pdl);
-
-    if ((sz = driver_sizeq(ix)) > 0) {
-	driver_enqv(ix, ev, 0);
-
-        if (driver_data[fd].blocking && FDBLOCK)
-            driver_pdl_unlock(driver_data[fd].blocking->pdl);
-
-	if (sz + ev->size >= (1 << 13))
-	    set_busy_port(ix, 1);
-    }
-    else if (!driver_data[fd].blocking || !FDBLOCK) {
-        /* We try to write directly if the fd in non-blocking */
-	int vsize = ev->vsize > MAX_VSIZE ? MAX_VSIZE : ev->vsize;
-
-	n = writev(ofd, (const void *) (ev->iov), vsize);
-	if (n == ev->size)
-	    return; /* 0;*/
-	if (n < 0) {
-	    if ((errno != EINTR) && (errno != ERRNO_BLOCK)) {
-		driver_failure_posix(ix, errno);
-		return; /* -1;*/
-	    }
-	    n = 0;
-	}
-	driver_enqv(ix, ev, n);  /* n is the skip value */
-	driver_select(ix, ofd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
-    }
-#if FDBLOCK
-    else {
-        if (ev->size != 0) {
-            driver_enqv(ix, ev, 0);
-            driver_pdl_unlock(driver_data[fd].blocking->pdl);
-            driver_async(ix, &driver_data[fd].blocking->pkey,
-                         fd_async, driver_data+fd, NULL);
-        } else {
-            driver_pdl_unlock(driver_data[fd].blocking->pdl);
-        }
-    }
-#endif
-    /* return 0;*/
-}
-
-/* Used by spawn_driver and vanilla driver */
-static void output(ErlDrvData e, char* buf, ErlDrvSizeT len)
-{
-    int fd = (int)(long)e;
-    ErlDrvPort ix = driver_data[fd].port_num;
-    int pb = driver_data[fd].packet_bytes;
-    int ofd = driver_data[fd].ofd;
-    ssize_t n;
-    ErlDrvSizeT sz;
-    char lb[4];
-    char* lbp;
-    struct iovec iv[2];
-
-    /* (len > ((unsigned long)-1 >> (4-pb)*8)) */
-    if (((pb == 2) && (len > 0xffff)) || (pb == 1 && len > 0xff)) {
-	driver_failure_posix(ix, EINVAL);
-	return; /* -1; */
-    }
-    put_int32(len, lb);
-    lbp = lb + (4-pb);
-
-    if ((sz = driver_sizeq(ix)) > 0) {
-	driver_enq(ix, lbp, pb);
-	driver_enq(ix, buf, len);
-	if (sz + len + pb >= (1 << 13))
-	    set_busy_port(ix, 1);
-    }
-    else {
-	iv[0].iov_base = lbp;
-	iv[0].iov_len = pb;  /* should work for pb=0 */
-	iv[1].iov_base = buf;
-	iv[1].iov_len = len;
-	n = writev(ofd, iv, 2);
-	if (n == pb+len)
-	    return; /* 0; */
-	if (n < 0) {
-	    if ((errno != EINTR) && (errno != ERRNO_BLOCK)) {
-		driver_failure_posix(ix, errno);
-		return; /* -1; */
-	    }
-	    n = 0;
-	}
-	if (n < pb) {
-	    driver_enq(ix, lbp+n, pb-n);
-	    driver_enq(ix, buf, len);
-	}
-	else {
-	    n -= pb;
-	    driver_enq(ix, buf+n, len-n);
-	}
-	driver_select(ix, ofd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
-    }
-    return; /* 0; */
-}
-
-static int port_inp_failure(ErlDrvPort port_num, int ready_fd, int res)
-				/* Result: 0 (eof) or -1 (error) */
-{
-    int err = errno;
-
-    ASSERT(res <= 0);
-    (void) driver_select(port_num, ready_fd, ERL_DRV_READ|ERL_DRV_WRITE, 0); 
-    clear_fd_data(ready_fd);
-
-    if (driver_data[ready_fd].blocking && FDBLOCK) {
-        driver_pdl_lock(driver_data[ready_fd].blocking->pdl);
-        if (driver_sizeq(driver_data[ready_fd].port_num) > 0) {
-            driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
-            /* We have stuff in the output queue, so we just
-               set the state to terminating and wait for fd_async_ready
-               to terminate the port */
-            if (res == 0)
-                driver_data[ready_fd].terminating = 2;
-            else
-                driver_data[ready_fd].terminating = -err;
-            return 0;
-        }
-        driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
-    }
-
-    if (res == 0) {
-	if (driver_data[ready_fd].report_exit) {
-	    CHLD_STAT_LOCK;
-
-	    if (driver_data[ready_fd].alive) {
-		/*
-		 * We have eof and want to report exit status, but the process
-		 * hasn't exited yet. When it does report_exit_status() will
-		 * driver_select() this fd which will make sure that we get
-		 * back here with driver_data[ready_fd].alive == 0 and
-		 * driver_data[ready_fd].status set.
-		 */
-		CHLD_STAT_UNLOCK;
-		return 0;
-	    }
-	    else {
-		int status = driver_data[ready_fd].status;
-		CHLD_STAT_UNLOCK;
-
-		/* We need not be prepared for stopped/continued processes. */
-		if (WIFSIGNALED(status))
-		    status = 128 + WTERMSIG(status);
-		else
-		    status = WEXITSTATUS(status);
-
-		driver_report_exit(driver_data[ready_fd].port_num, status);
-	    }
-       }
-       driver_failure_eof(port_num);
-    } else {
-	driver_failure_posix(port_num, err);
-    }
-    return 0;
-}
-
-/* fd is the drv_data that is returned from the */
-/* initial start routine                        */
-/* ready_fd is the descriptor that is ready to read */
-
-static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
-{
-    int fd = (int)(long)e;
-    ErlDrvPort port_num;
-    int packet_bytes;
-    int res;
-    Uint h;
-
-    port_num = driver_data[fd].port_num;
-    packet_bytes = driver_data[fd].packet_bytes;
-
-
-    if (packet_bytes == 0) {
-	byte *read_buf = (byte *) erts_alloc(ERTS_ALC_T_SYS_READ_BUF,
-					     ERTS_SYS_READ_BUF_SZ);
-	res = read(ready_fd, read_buf, ERTS_SYS_READ_BUF_SZ);
-	if (res < 0) {
-	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
-		port_inp_failure(port_num, ready_fd, res);
-	}
-	else if (res == 0)
-	    port_inp_failure(port_num, ready_fd, res);
-	else 
-	    driver_output(port_num, (char*) read_buf, res);
-	erts_free(ERTS_ALC_T_SYS_READ_BUF, (void *) read_buf);
-    }
-    else if (fd_data[ready_fd].remain > 0) { /* We try to read the remainder */
-	/* space is allocated in buf */
-	res = read(ready_fd, fd_data[ready_fd].cpos, 
-		   fd_data[ready_fd].remain);
-	if (res < 0) {
-	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
-		port_inp_failure(port_num, ready_fd, res);
-	}
-	else if (res == 0) {
-	    port_inp_failure(port_num, ready_fd, res);
-	}
-	else if (res == fd_data[ready_fd].remain) { /* we're done  */
-	    driver_output(port_num, fd_data[ready_fd].buf, 
-			  fd_data[ready_fd].sz);
-	    clear_fd_data(ready_fd);
-	}
-	else { /*  if (res < fd_data[ready_fd].remain) */
-	    fd_data[ready_fd].cpos += res;
-	    fd_data[ready_fd].remain -= res;
-	}
-    }
-    else if (fd_data[ready_fd].remain == 0) { /* clean fd */
-	byte *read_buf = (byte *) erts_alloc(ERTS_ALC_T_SYS_READ_BUF,
-					     ERTS_SYS_READ_BUF_SZ);
-	/* We make one read attempt and see what happens */
-	res = read(ready_fd, read_buf, ERTS_SYS_READ_BUF_SZ);
-	if (res < 0) {  
-	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
-		port_inp_failure(port_num, ready_fd, res);
-	}
-	else if (res == 0) {     	/* eof */
-	    port_inp_failure(port_num, ready_fd, res);
-	} 
-	else if (res < packet_bytes - fd_data[ready_fd].psz) { 
-	    memcpy(fd_data[ready_fd].pbuf+fd_data[ready_fd].psz,
-		   read_buf, res);
-	    fd_data[ready_fd].psz += res;
-	}
-	else  { /* if (res >= packet_bytes) */
-	    unsigned char* cpos = read_buf;
-	    int bytes_left = res;
-
-	    while (1) {
-		int psz = fd_data[ready_fd].psz;
-		char* pbp = fd_data[ready_fd].pbuf + psz;
-
-		while(bytes_left && (psz < packet_bytes)) {
-		    *pbp++ = *cpos++;
-		    bytes_left--;
-		    psz++;
-		}
-		
-		if (psz < packet_bytes) {
-		    fd_data[ready_fd].psz = psz;
-		    break;
-		}
-		fd_data[ready_fd].psz = 0;
-
-		switch (packet_bytes) {
-		case 1: h = get_int8(fd_data[ready_fd].pbuf);  break;
-		case 2: h = get_int16(fd_data[ready_fd].pbuf); break;
-		case 4: h = get_int32(fd_data[ready_fd].pbuf); break;
-		default: ASSERT(0); return; /* -1; */
-		}
-
-		if (h <= (bytes_left)) {
-		    driver_output(port_num, (char*) cpos, h);
-		    cpos += h;
-		    bytes_left -= h;
-		    continue;
-		}
-		else {		/* The last message we got was split */
-		        char *buf = erts_alloc_fnf(ERTS_ALC_T_FD_ENTRY_BUF, h);
-		    if (!buf) {
-			errno = ENOMEM;
-			port_inp_failure(port_num, ready_fd, -1);
-		    }
-		    else {
-			erts_smp_atomic_add_nob(&sys_misc_mem_sz, h);
-			sys_memcpy(buf, cpos, bytes_left);
-			fd_data[ready_fd].buf = buf;
-			fd_data[ready_fd].sz = h;
-			fd_data[ready_fd].remain = h - bytes_left;
-			fd_data[ready_fd].cpos = buf + bytes_left;
-		    }
-		    break;
-		}
-	    }
-	}
-	erts_free(ERTS_ALC_T_SYS_READ_BUF, (void *) read_buf);
-    }
-}
-
-
-/* fd is the drv_data that is returned from the */
-/* initial start routine                        */
-/* ready_fd is the descriptor that is ready to read */
-
-static void ready_output(ErlDrvData e, ErlDrvEvent ready_fd)
-{
-    int fd = (int)(long)e;
-    ErlDrvPort ix = driver_data[fd].port_num;
-    int n;
-    struct iovec* iv;
-    int vsize;
-    
-
-    if ((iv = (struct iovec*) driver_peekq(ix, &vsize)) == NULL) {
-	driver_select(ix, ready_fd, ERL_DRV_WRITE, 0);
-        if (driver_data[fd].terminating)
-            driver_failure_atom(driver_data[fd].port_num,"normal");
-	return; /* 0; */
-    }
-    vsize = vsize > MAX_VSIZE ? MAX_VSIZE : vsize;
-    if ((n = writev(ready_fd, iv, vsize)) > 0) {
-	if (driver_deq(ix, n) == 0)
-	    set_busy_port(ix, 0);
-    }
-    else if (n < 0) {
-	if (errno == ERRNO_BLOCK || errno == EINTR)
-	    return; /* 0; */
-	else {
-	    int res = errno;
-	    driver_select(ix, ready_fd, ERL_DRV_WRITE, 0);
-	    driver_failure_posix(ix, res);
-	    return; /* -1; */
-	}
-    }
-    return; /* 0; */
-}
-
-static void stop_select(ErlDrvEvent fd, void* _)
-{
-    close((int)fd);
-}
-
-#if FDBLOCK
-
-static void
-fd_async(void *async_data)
-{
-    int res;
-    ErtsSysDriverData *dd = (ErtsSysDriverData*)async_data;
-    SysIOVec      *iov0;
-    SysIOVec      *iov;
-    int            iovlen;
-    int            err = 0;
-    /* much of this code is stolen from efile_drv:invoke_writev */
-    driver_pdl_lock(dd->blocking->pdl);
-    iov0 = driver_peekq(dd->port_num, &iovlen);
-    iovlen = iovlen < MAXIOV ? iovlen : MAXIOV;
-    iov = erts_alloc_fnf(ERTS_ALC_T_SYS_WRITE_BUF,
-                         sizeof(SysIOVec)*iovlen);
-    if (!iov) {
-        res = -1;
-        err = ENOMEM;
-        driver_pdl_unlock(dd->blocking->pdl);
-    } else {
-        memcpy(iov,iov0,iovlen*sizeof(SysIOVec));
-        driver_pdl_unlock(dd->blocking->pdl);
-
-        do {
-            res = writev(dd->ofd, iov, iovlen);
-        } while (res < 0 && errno == EINTR);
-        if (res < 0)
-            err = errno;
-
-        erts_free(ERTS_ALC_T_SYS_WRITE_BUF, iov);
-    }
-    dd->blocking->res = res;
-    dd->blocking->err = err;
-}
-
-void fd_ready_async(ErlDrvData drv_data,
-                    ErlDrvThreadData thread_data) {
-    ErtsSysDriverData *dd = (ErtsSysDriverData *)thread_data;
-    ErlDrvPort port_num = dd->port_num;
-
-    ASSERT(dd->blocking);
-    ASSERT(dd == (driver_data + (int)(long)drv_data));
-
-    if (dd->blocking->res > 0) {
-        driver_pdl_lock(dd->blocking->pdl);
-        if (driver_deq(port_num, dd->blocking->res) == 0) {
-            driver_pdl_unlock(dd->blocking->pdl);
-            set_busy_port(port_num, 0);
-            if (dd->terminating) {
-                /* The port is has been ordered to terminate
-                   from either fd_flush or port_inp_failure */
-                if (dd->terminating == 1)
-                    driver_failure_atom(port_num, "normal");
-                else if (dd->terminating == 2)
-                    driver_failure_eof(port_num);
-                else if (dd->terminating < 0)
-                    driver_failure_posix(port_num, -dd->terminating);
-                return; /* -1; */
-            }
-        } else {
-            driver_pdl_unlock(dd->blocking->pdl);
-            /* still data left to write in queue */
-            driver_async(port_num, &dd->blocking->pkey, fd_async, dd, NULL);
-            return /* 0; */;
-        }
-    } else if (dd->blocking->res < 0) {
-        if (dd->blocking->err == ERRNO_BLOCK) {
-            set_busy_port(port_num, 1);
-            /* still data left to write in queue */
-            driver_async(port_num, &dd->blocking->pkey, fd_async, dd, NULL);
-        } else
-            driver_failure_posix(port_num, dd->blocking->err);
-        return; /* -1; */
-    }
-    return; /* 0; */
-}
-
-#endif
-
 void erts_do_break_handling(void)
 {
     struct termios temp_mode;
@@ -2740,10 +1010,7 @@ erts_sys_unsetenv(char *key)
 void
 sys_init_io(void)
 {
-    fd_data = (ErtsSysFdData *)
-	erts_alloc(ERTS_ALC_T_FD_TAB, max_files * sizeof(ErtsSysFdData));
-    erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-			    max_files * sizeof(ErtsSysFdData));
+
 }
 
 #if (0) /* unused? */
@@ -2937,178 +1204,6 @@ erl_debug(char* fmt, ...)
 
 #endif /* DEBUG */
 
-static ERTS_INLINE void
-report_exit_status(ErtsSysReportExit *rep, int status)
-{
-    Port *pp;
-#ifdef ERTS_SMP
-    CHLD_STAT_UNLOCK;
-    pp = erts_thr_id2port_sflgs(rep->port,
-				ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP);
-    CHLD_STAT_LOCK;
-#else
-    pp = erts_id2port_sflgs(rep->port,
-			    NULL,
-			    0,
-			    ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP);
-#endif
-    if (pp) {
-	if (rep->ifd >= 0) {
-	    driver_data[rep->ifd].alive = 0;
-	    driver_data[rep->ifd].status = status;
-	    (void) driver_select(ERTS_Port2ErlDrvPort(pp),
-				 rep->ifd,
-				 (ERL_DRV_READ|ERL_DRV_USE),
-				 1);
-	}
-	if (rep->ofd >= 0) {
-	    driver_data[rep->ofd].alive = 0;
-	    driver_data[rep->ofd].status = status;
-	    (void) driver_select(ERTS_Port2ErlDrvPort(pp),
-				 rep->ofd,
-				 (ERL_DRV_WRITE|ERL_DRV_USE),
-				 1);
-	}
-#ifdef ERTS_SMP
-	erts_thr_port_release(pp);
-#else
-	erts_port_release(pp);
-#endif
-    }
-    erts_free(ERTS_ALC_T_PRT_REP_EXIT, rep);
-}
-
-#if !CHLDWTHR  /* ---------------------------------------------------------- */
-
-#define ERTS_REPORT_EXIT_STATUS report_exit_status
-
-static int check_children(void)
-{
-    int res = 0;
-    int pid;
-    int status;
-
-#ifndef ERTS_SMP
-    if (children_died)
-#endif
-    {
-	sys_sigblock(SIGCHLD);
-	CHLD_STAT_LOCK;
-	while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
-	    note_child_death(pid, status);
-#ifndef ERTS_SMP
-	children_died = 0;
-#endif
-	CHLD_STAT_UNLOCK;
-	sys_sigrelease(SIGCHLD);
-	res = 1;
-    }
-    return res;
-}
-
-#ifdef ERTS_SMP
-
-void
-erts_check_children(void)
-{
-    (void) check_children();
-}
-
-#endif
-
-#elif CHLDWTHR && defined(ERTS_SMP) /* ------------------------------------- */
-
-#define ERTS_REPORT_EXIT_STATUS report_exit_status
-
-#define check_children() (0)
-
-
-#else /* CHLDWTHR && !defined(ERTS_SMP) ------------------------------------ */
-
-#define ERTS_REPORT_EXIT_STATUS initiate_report_exit_status
-
-static ERTS_INLINE void
-initiate_report_exit_status(ErtsSysReportExit *rep, int status)
-{
-    rep->next = report_exit_transit_list;
-    rep->status = status;
-    report_exit_transit_list = rep;
-    erts_sys_schedule_interrupt(1);
-}
-
-static int check_children(void)
-{
-    int res;
-    ErtsSysReportExit *rep;
-    CHLD_STAT_LOCK;
-    rep = report_exit_transit_list;
-    res = rep != NULL;
-    while (rep) {
-	ErtsSysReportExit *curr_rep = rep;
-	rep = rep->next;
-	report_exit_status(curr_rep, curr_rep->status);
-    }
-    report_exit_transit_list = NULL;
-    CHLD_STAT_UNLOCK;
-    return res;
-}
-
-#endif /* ------------------------------------------------------------------ */
-
-static void note_child_death(int pid, int status)
-{
-    ErtsSysReportExit **repp = &report_exit_list;
-    ErtsSysReportExit *rep = report_exit_list;
-
-    while (rep) {
-	if (pid == rep->pid) {
-	    *repp = rep->next;
-	    ERTS_REPORT_EXIT_STATUS(rep, status);
-	    break;
-	}
-	repp = &rep->next;
-	rep = rep->next;
-    }
-}
-
-#if CHLDWTHR
-
-static void *
-child_waiter(void *unused)
-{
-  int pid;
-  int status;
-
-#ifdef ERTS_ENABLE_LOCK_CHECK
-  erts_lc_set_thread_name("child waiter");
-#endif
-
-  while(1) {
-#ifdef DEBUG
-      int waitpid_errno;
-#endif
-      pid = waitpid(-1, &status, 0);
-#ifdef DEBUG
-      waitpid_errno = errno;
-#endif
-      CHLD_STAT_LOCK;
-      if (pid < 0) {
-	  ASSERT(waitpid_errno == ECHILD);
-      }
-      else {
-	  children_alive--;
-	  ASSERT(children_alive >= 0);
-	  note_child_death(pid, status);
-      }
-      while (!children_alive)
-	  CHLD_STAT_WAIT; /* Wait for children to wait on... :) */
-      CHLD_STAT_UNLOCK;
-  }
-
-  return NULL;
-}
-
-#endif
 
 /*
  * Called from schedule() when it runs out of runnable processes,
@@ -3127,7 +1222,6 @@ erl_sys_schedule(int runnable)
     (void) check_children();
 }
 
-
 #ifdef ERTS_SMP
 
 static erts_smp_tid_t sig_dispatcher_tid;
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
new file mode 100644
index 0000000000..e3f089fc0f
--- /dev/null
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -0,0 +1,1983 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 1996-2014. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#ifdef ISC32
+#define _POSIX_SOURCE
+#define _XOPEN_SOURCE
+#endif
+
+#include <sys/times.h>		/* ! */
+#include <time.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <termios.h>
+#include <ctype.h>
+#include <sys/utsname.h>
+#include <sys/select.h>
+
+#ifdef ISC32
+#include <sys/bsdtypes.h>
+#endif
+
+#include <termios.h>
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#define NEED_CHILD_SETUP_DEFINES
+#define WANT_NONBLOCKING    /* must define this to pull in defs from sys.h */
+#include "sys.h"
+#include "erl_thr_progress.h"
+
+#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
+#define __DARWIN__ 1
+#endif
+
+#ifdef USE_THREADS
+#include "erl_threads.h"
+#endif
+
+#include "erl_mseg.h"
+
+extern char **environ;
+extern erts_smp_rwmtx_t environ_rwmtx;
+
+extern erts_smp_atomic_t sys_misc_mem_sz;
+
+#define MAX_VSIZE 16		/* Max number of entries allowed in an I/O
+				 * vector sock_sendv().
+				 */
+/*
+ * Don't need global.h, but erl_cpu_topology.h won't compile otherwise
+ */
+#include "global.h"
+
+#include "erl_sys_driver.h"
+#include "erl_check_io.h"
+#include "erl_cpu_topology.h"
+
+#ifndef DISABLE_VFORK
+#define DISABLE_VFORK 0
+#endif
+
+#if defined IOV_MAX
+#define MAXIOV IOV_MAX
+#elif defined UIO_MAXIOV
+#define MAXIOV UIO_MAXIOV
+#else
+#define MAXIOV 16
+#endif
+
+/*
+ * [OTP-3906]
+ * Solaris signal management gets confused when threads are used and a
+ * lot of child processes dies. The confusion results in that SIGCHLD
+ * signals aren't delivered to the emulator which in turn results in
+ * a lot of defunct processes in the system.
+ *
+ * The problem seems to appear when a signal is frequently
+ * blocked/unblocked at the same time as the signal is frequently
+ * propagated. The child waiter thread is a workaround for this problem.
+ * The SIGCHLD signal is always blocked (in all threads), and the child
+ * waiter thread fetches the signal by a call to sigwait(). See
+ * child_waiter().
+ */
+
+typedef struct ErtsSysReportExit_ ErtsSysReportExit;
+struct ErtsSysReportExit_ {
+    ErtsSysReportExit *next;
+    Eterm port;
+    int pid;
+    int ifd;
+    int ofd;
+#if CHLDWTHR && !defined(ERTS_SMP)
+    int status;
+#endif
+};
+
+/* Used by the fd driver iff the fd could not be set to non-blocking */
+typedef struct ErtsSysBlocking_ {
+    ErlDrvPDL pdl;
+    int res;
+    int err;
+    unsigned int pkey;
+} ErtsSysBlocking;
+
+
+/* This data is shared by these drivers - initialized by spawn_init() */
+typedef struct driver_data {
+    ErlDrvPort port_num;
+    int ofd, packet_bytes;
+    ErtsSysReportExit *report_exit;
+    int pid;
+    int alive;
+    int status;
+    int terminating;
+    ErtsSysBlocking *blocking;
+} ErtsSysDriverData;
+
+static ErtsSysDriverData *driver_data;			/* indexed by fd */
+
+static ErtsSysReportExit *report_exit_list;
+#if CHLDWTHR && !defined(ERTS_SMP)
+static ErtsSysReportExit *report_exit_transit_list;
+#endif
+
+#define DIR_SEPARATOR_CHAR    '/'
+
+#if defined(__ANDROID__)
+#define SHELL "/system/bin/sh"
+#else
+#define SHELL "/bin/sh"
+#endif /* __ANDROID__ */
+
+
+#if defined(DEBUG)
+#define ERL_BUILD_TYPE_MARKER ".debug"
+#elif defined(PURIFY)
+#define ERL_BUILD_TYPE_MARKER ".purify"
+#elif defined(QUANTIFY)
+#define ERL_BUILD_TYPE_MARKER ".quantify"
+#elif defined(PURECOV)
+#define ERL_BUILD_TYPE_MARKER ".purecov"
+#elif defined(VALGRIND)
+#define ERL_BUILD_TYPE_MARKER ".valgrind"
+#else /* opt */
+#define ERL_BUILD_TYPE_MARKER
+#endif
+
+#define CHILD_SETUP_PROG_NAME	"erl_child_setup" ERL_BUILD_TYPE_MARKER
+static char *child_setup_prog;
+
+#if CHLDWTHR || defined(ERTS_SMP)
+erts_mtx_t chld_stat_mtx;
+#endif
+#if CHLDWTHR
+static erts_tid_t child_waiter_tid;
+/* chld_stat_mtx is used to protect against concurrent accesses
+   of the driver_data fields pid, alive, and status. */
+erts_cnd_t chld_stat_cnd;
+static long children_alive;
+#define CHLD_STAT_LOCK		erts_mtx_lock(&chld_stat_mtx)
+#define CHLD_STAT_UNLOCK	erts_mtx_unlock(&chld_stat_mtx)
+#define CHLD_STAT_WAIT		erts_cnd_wait(&chld_stat_cnd, &chld_stat_mtx)
+#define CHLD_STAT_SIGNAL	erts_cnd_signal(&chld_stat_cnd)
+#elif defined(ERTS_SMP) /* ------------------------------------------------- */
+#define CHLD_STAT_LOCK		erts_mtx_lock(&chld_stat_mtx)
+#define CHLD_STAT_UNLOCK	erts_mtx_unlock(&chld_stat_mtx)
+
+#else /* ------------------------------------------------------------------- */
+#define CHLD_STAT_LOCK
+#define CHLD_STAT_UNLOCK
+static volatile int children_died;
+#endif
+
+typedef struct ErtsSysFdData {
+    char  pbuf[4];   /* hold partial packet bytes */
+    int   psz;       /* size of pbuf */
+    char  *buf;
+    char  *cpos;
+    int   sz;
+    int   remain;  /* for input on fd */
+} ErtsSysFdData;
+
+static ErtsSysFdData *fd_data;			/* indexed by fd */
+
+/* static FUNCTION(int, write_fill, (int, char*, int)); unused? */
+static void note_child_death(int, int);
+
+#if CHLDWTHR
+static void* child_waiter(void *);
+#endif
+
+static void block_signals(void)
+{
+#if !CHLDWTHR
+   sys_sigblock(SIGCHLD);
+#endif
+#ifndef ERTS_SMP
+   sys_sigblock(SIGINT);
+#ifndef ETHR_UNUSABLE_SIGUSRX
+   sys_sigblock(SIGUSR1);
+#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
+#endif /* #ifndef ERTS_SMP */
+
+#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
+   sys_sigblock(ERTS_SYS_SUSPEND_SIGNAL);
+#endif
+
+}
+
+static void unblock_signals(void)
+{
+    /* Update erl_child_setup.c if changed */
+#if !CHLDWTHR
+   sys_sigrelease(SIGCHLD);
+#endif
+#ifndef ERTS_SMP
+   sys_sigrelease(SIGINT);
+#ifndef ETHR_UNUSABLE_SIGUSRX
+   sys_sigrelease(SIGUSR1);
+#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
+#endif /* #ifndef ERTS_SMP */
+
+#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
+   sys_sigrelease(ERTS_SYS_SUSPEND_SIGNAL);
+#endif
+
+}
+
+/************************** Port I/O *******************************/
+
+
+
+/* I. Common stuff */
+
+/*
+ * Decreasing the size of it below 16384 is not allowed.
+ */
+
+/* II. The spawn/fd/vanilla drivers */
+
+#define ERTS_SYS_READ_BUF_SZ (64*1024)
+
+/* Driver interfaces */
+static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
+static ErlDrvData fd_start(ErlDrvPort, char*, SysDriverOpts*);
+#if FDBLOCK
+static void fd_async(void *);
+static void fd_ready_async(ErlDrvData drv_data, ErlDrvThreadData thread_data);
+#endif
+static ErlDrvSSizeT fd_control(ErlDrvData, unsigned int, char *, ErlDrvSizeT,
+			       char **, ErlDrvSizeT);
+static ErlDrvData vanilla_start(ErlDrvPort, char*, SysDriverOpts*);
+static int spawn_init(void);
+static void fd_stop(ErlDrvData);
+static void fd_flush(ErlDrvData);
+static void stop(ErlDrvData);
+static void ready_input(ErlDrvData, ErlDrvEvent);
+static void ready_output(ErlDrvData, ErlDrvEvent);
+static void output(ErlDrvData, char*, ErlDrvSizeT);
+static void outputv(ErlDrvData, ErlIOVec*);
+static void stop_select(ErlDrvEvent, void*);
+
+struct erl_drv_entry spawn_driver_entry = {
+    spawn_init,
+    spawn_start,
+    stop,
+    output,
+    ready_input,
+    ready_output,
+    "spawn",
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    ERL_DRV_EXTENDED_MARKER,
+    ERL_DRV_EXTENDED_MAJOR_VERSION,
+    ERL_DRV_EXTENDED_MINOR_VERSION,
+    ERL_DRV_FLAG_USE_PORT_LOCKING,
+    NULL, NULL,
+    stop_select
+};
+struct erl_drv_entry fd_driver_entry = {
+    NULL,
+    fd_start,
+    fd_stop,
+    output,
+    ready_input,
+    ready_output, 
+    "fd",
+    NULL,
+    NULL,
+    fd_control,
+    NULL,
+    outputv,
+#if FDBLOCK
+    fd_ready_async, /* ready_async */
+#else
+    NULL,
+#endif
+    fd_flush, /* flush */
+    NULL, /* call */
+    NULL, /* event */
+    ERL_DRV_EXTENDED_MARKER,
+    ERL_DRV_EXTENDED_MAJOR_VERSION,
+    ERL_DRV_EXTENDED_MINOR_VERSION,
+    0, /* ERL_DRV_FLAGs */
+    NULL, /* handle2 */
+    NULL, /* process_exit */
+    stop_select
+};
+struct erl_drv_entry vanilla_driver_entry = {
+    NULL,
+    vanilla_start,
+    stop,
+    output,
+    ready_input,
+    ready_output,
+    "vanilla",
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL, /* flush */
+    NULL, /* call */
+    NULL, /* event */
+    ERL_DRV_EXTENDED_MARKER,
+    ERL_DRV_EXTENDED_MAJOR_VERSION,
+    ERL_DRV_EXTENDED_MINOR_VERSION,
+    0, /* ERL_DRV_FLAGs */
+    NULL, /* handle2 */
+    NULL, /* process_exit */
+    stop_select
+};
+
+/* Handle SIGCHLD signals. */
+#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
+static RETSIGTYPE onchld(void)
+#else
+static RETSIGTYPE onchld(int signum)
+#endif
+{
+#if CHLDWTHR
+    ASSERT(0); /* We should *never* catch a SIGCHLD signal */
+#elif defined(ERTS_SMP)
+    smp_sig_notify('C');
+#else
+    children_died = 1;
+    ERTS_CHK_IO_AS_INTR(); /* Make sure we don't sleep in poll */
+#endif
+}
+
+static int set_blocking_data(ErtsSysDriverData *dd) {
+
+    dd->blocking = erts_alloc(ERTS_ALC_T_SYS_BLOCKING, sizeof(ErtsSysBlocking));
+
+    erts_smp_atomic_add_nob(&sys_misc_mem_sz, sizeof(ErtsSysBlocking));
+
+    dd->blocking->pdl = driver_pdl_create(dd->port_num);
+    dd->blocking->res = 0;
+    dd->blocking->err = 0;
+    dd->blocking->pkey = driver_async_port_key(dd->port_num);
+
+    return 1;
+}
+
+static int set_driver_data(ErlDrvPort port_num,
+			   int ifd,
+			   int ofd,
+			   int packet_bytes,
+			   int read_write,
+			   int exit_status,
+			   int pid,
+                           int is_blocking)
+{
+    Port *prt;
+    ErtsSysReportExit *report_exit;
+
+    if (!exit_status)
+	report_exit = NULL;
+    else {
+	report_exit = erts_alloc(ERTS_ALC_T_PRT_REP_EXIT,
+				 sizeof(ErtsSysReportExit));
+	report_exit->next = report_exit_list;
+	report_exit->port = erts_drvport2id(port_num);
+	report_exit->pid = pid;
+	report_exit->ifd = read_write & DO_READ ? ifd : -1;
+	report_exit->ofd = read_write & DO_WRITE ? ofd : -1;
+#if CHLDWTHR && !defined(ERTS_SMP)
+	report_exit->status = 0;
+#endif
+	report_exit_list = report_exit;
+    }
+
+    prt = erts_drvport2port(port_num);
+    if (prt != ERTS_INVALID_ERL_DRV_PORT)
+	prt->os_pid = pid;
+
+    if (read_write & DO_READ) {
+	driver_data[ifd].packet_bytes = packet_bytes;
+	driver_data[ifd].port_num = port_num;
+	driver_data[ifd].report_exit = report_exit;
+	driver_data[ifd].pid = pid;
+	driver_data[ifd].alive = 1;
+	driver_data[ifd].status = 0;
+        driver_data[ifd].terminating = 0;
+        driver_data[ifd].blocking = NULL;
+	if (read_write & DO_WRITE) {
+	    driver_data[ifd].ofd = ofd;
+            if (is_blocking && FDBLOCK)
+                if (!set_blocking_data(driver_data+ifd))
+                    return -1;
+	    if (ifd != ofd)
+		driver_data[ofd] = driver_data[ifd];  /* structure copy */
+	} else {		/* DO_READ only */
+	    driver_data[ifd].ofd = -1;
+	}
+	(void) driver_select(port_num, ifd, (ERL_DRV_READ|ERL_DRV_USE), 1);
+	return(ifd);
+    } else {			/* DO_WRITE only */
+	driver_data[ofd].packet_bytes = packet_bytes;
+	driver_data[ofd].port_num = port_num;
+	driver_data[ofd].report_exit = report_exit;
+	driver_data[ofd].ofd = ofd;
+	driver_data[ofd].pid = pid;
+	driver_data[ofd].alive = 1;
+	driver_data[ofd].status = 0;
+        driver_data[ofd].terminating = 0;
+        driver_data[ofd].blocking = NULL;
+        if (is_blocking && FDBLOCK)
+            if (!set_blocking_data(driver_data+ofd))
+                return -1;
+	return(ofd);
+    }
+}
+
+static int spawn_init()
+{
+   int i;
+#if CHLDWTHR
+   erts_thr_opts_t thr_opts = ERTS_THR_OPTS_DEFAULT_INITER;
+#endif
+   int res;
+   char bindir[MAXPATHLEN];
+   size_t bindirsz = sizeof(bindir);
+   Uint csp_path_sz;
+
+#if CHLDWTHR
+   thr_opts.detached = 0;
+   thr_opts.suggested_stack_size = 0; /* Smallest possible */
+   thr_opts.name = "child_waiter";
+#endif
+
+#if !DISABLE_VFORK
+   res = erts_sys_getenv_raw("BINDIR", bindir, &bindirsz);
+   if (res != 0) {
+    if (res < 0)
+        erl_exit(-1,
+        "Environment variable BINDIR is not set\n");
+    if (res > 0)
+        erl_exit(-1,
+        "Value of environment variable BINDIR is too large\n");
+   }
+   if (bindir[0] != DIR_SEPARATOR_CHAR)
+       erl_exit(-1,
+                "Environment variable BINDIR does not contain an"
+                " absolute path\n");
+   csp_path_sz = (strlen(bindir)
+                  + 1 /* DIR_SEPARATOR_CHAR */
+                  + sizeof(CHILD_SETUP_PROG_NAME)
+                  + 1);
+   child_setup_prog = erts_alloc(ERTS_ALC_T_CS_PROG_PATH, csp_path_sz);
+   erts_smp_atomic_add_nob(&sys_misc_mem_sz, csp_path_sz);
+   erts_snprintf(child_setup_prog, csp_path_sz,
+                 "%s%c%s",
+                 bindir,
+                 DIR_SEPARATOR_CHAR,
+                 CHILD_SETUP_PROG_NAME);
+#endif
+
+   report_exit_list = NULL;
+
+#ifdef USE_THREADS
+
+#if CHLDWTHR || defined(ERTS_SMP)
+    erts_mtx_init(&chld_stat_mtx, "child_status");
+#endif
+#if CHLDWTHR
+#ifndef ERTS_SMP
+    report_exit_transit_list = NULL;
+#endif
+    erts_cnd_init(&chld_stat_cnd);
+    children_alive = 0;
+#endif
+
+#if !CHLDWTHR && !defined(ERTS_SMP)
+    children_died = 0;
+#endif
+
+#endif /* USE_THREADS */
+
+   sys_signal(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
+   driver_data = (ErtsSysDriverData *)
+       erts_alloc(ERTS_ALC_T_DRV_TAB, sys_max_files() * sizeof(ErtsSysDriverData));
+   erts_smp_atomic_add_nob(&sys_misc_mem_sz,
+			   sys_max_files() * sizeof(ErtsSysDriverData));
+
+   for (i = 0; i < sys_max_files(); i++)
+      driver_data[i].pid = -1;
+
+   fd_data = (ErtsSysFdData *)
+       erts_alloc(ERTS_ALC_T_FD_TAB, sys_max_files() * sizeof(ErtsSysFdData));
+   erts_smp_atomic_add_nob(&sys_misc_mem_sz,
+        sys_max_files() * sizeof(ErtsSysFdData));
+
+#if CHLDWTHR
+   sys_sigblock(SIGCHLD);
+#endif
+
+   sys_signal(SIGCHLD, onchld); /* Reap children */
+
+#if CHLDWTHR
+   erts_thr_create(&child_waiter_tid, child_waiter, NULL, &thr_opts);
+#endif
+
+   return 1;
+}
+
+static void close_pipes(int ifd[2], int ofd[2], int read_write)
+{
+    if (read_write & DO_READ) {
+	(void) close(ifd[0]);
+	(void) close(ifd[1]);
+    }
+    if (read_write & DO_WRITE) {
+	(void) close(ofd[0]);
+	(void) close(ofd[1]);
+    }
+}
+
+static void init_fd_data(int fd, ErlDrvPort port_num)
+{
+    fd_data[fd].buf = NULL;
+    fd_data[fd].cpos = NULL;
+    fd_data[fd].remain = 0;
+    fd_data[fd].sz = 0;
+    fd_data[fd].psz = 0;
+}
+
+static char **build_unix_environment(char *block)
+{
+    int i;
+    int j;
+    int len;
+    char *cp;
+    char **cpp;
+    char** old_env;
+    
+    ERTS_SMP_LC_ASSERT(erts_smp_lc_rwmtx_is_rlocked(&environ_rwmtx));
+
+    cp = block;
+    len = 0;
+    while (*cp != '\0') {
+	cp += strlen(cp) + 1;
+	len++;
+    }
+    old_env = environ;
+    while (*old_env++ != NULL) {
+	len++;
+    }
+    
+    cpp = (char **) erts_alloc_fnf(ERTS_ALC_T_ENVIRONMENT,
+				   sizeof(char *) * (len+1));
+    if (cpp == NULL) {
+	return NULL;
+    }
+
+    cp = block;
+    len = 0;
+    while (*cp != '\0') {
+	cpp[len] = cp;
+	cp += strlen(cp) + 1;
+	len++;
+    }
+    
+    i = len;
+    for (old_env = environ; *old_env; old_env++) {
+	char* old = *old_env;
+
+	for (j = 0; j < len; j++) {
+	    char *s, *t;
+
+	    s = cpp[j];
+	    t = old;
+	    while (*s == *t && *s != '=') {
+		s++, t++;
+	    }
+	    if (*s == '=' && *t == '=') {
+		break;
+	    }
+	}
+
+	if (j == len) {		/* New version not found */
+	    cpp[len++] = old;
+	}
+    }
+
+    for (j = 0; j < i; ) {
+        size_t last = strlen(cpp[j])-1;
+	if (cpp[j][last] == '=' && strchr(cpp[j], '=') == cpp[j]+last) {
+	    cpp[j] = cpp[--len];
+	    if (len < i) {
+		i--;
+	    } else {
+		j++;
+	    }
+	}
+	else {
+	    j++;
+	}
+    }
+
+    cpp[len] = NULL;
+    return cpp;
+}
+
+/*
+  [arndt] In most Unix systems, including Solaris 2.5, 'fork' allocates memory
+  in swap space for the child of a 'fork', whereas 'vfork' does not do this.
+  The natural call to use here is therefore 'vfork'. Due to a bug in
+  'vfork' in Solaris 2.5 (apparently fixed in 2.6), using 'vfork'
+  can be dangerous in what seems to be these circumstances:
+      If the child code under a vfork sets the signal action to SIG_DFL
+      (or SIG_IGN)
+      for any signal which was previously set to a signal handler, the
+      state of the parent is clobbered, so that the later arrival of
+      such a signal yields a sigsegv in the parent. If the signal was
+      not set to a signal handler, but ignored, all seems to work.
+  If you change the forking code below, beware of this.
+ */
+
+static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* opts)
+{
+#define CMD_LINE_PREFIX_STR "exec "
+#define CMD_LINE_PREFIX_STR_SZ (sizeof(CMD_LINE_PREFIX_STR) - 1)
+
+    int ifd[2], ofd[2], len, pid, i;
+    char **volatile new_environ; /* volatile since a vfork() then cannot
+				    cause 'new_environ' to be clobbered
+				    in the parent process. */
+    int saved_errno;
+    long res;
+    char *cmd_line;
+#ifndef QNX
+    int unbind;
+#endif
+#if !DISABLE_VFORK
+    int no_vfork;
+    size_t no_vfork_sz = sizeof(no_vfork);
+
+    no_vfork = (erts_sys_getenv_raw("ERL_NO_VFORK",
+				    (char *) &no_vfork,
+				    &no_vfork_sz) >= 0);
+#endif
+
+    switch (opts->read_write) {
+    case DO_READ:
+	if (pipe(ifd) < 0)
+	    return ERL_DRV_ERROR_ERRNO;
+	if (ifd[0] >= sys_max_files()) {
+	    close_pipes(ifd, ofd, opts->read_write);
+	    errno = EMFILE;
+	    return ERL_DRV_ERROR_ERRNO;
+	}
+	ofd[1] = -1;		/* keep purify happy */
+	break;
+    case DO_WRITE:
+	if (pipe(ofd) < 0) return ERL_DRV_ERROR_ERRNO;
+	if (ofd[1] >= sys_max_files()) {
+	    close_pipes(ifd, ofd, opts->read_write);
+	    errno = EMFILE;
+	    return ERL_DRV_ERROR_ERRNO;
+	}
+	ifd[0] = -1;		/* keep purify happy */
+	break;
+    case DO_READ|DO_WRITE:
+	if (pipe(ifd) < 0) return ERL_DRV_ERROR_ERRNO;
+	errno = EMFILE;		/* default for next two conditions */
+	if (ifd[0] >= sys_max_files() || pipe(ofd) < 0) {
+	    close_pipes(ifd, ofd, DO_READ);
+	    return ERL_DRV_ERROR_ERRNO;
+	}
+	if (ofd[1] >= sys_max_files()) {
+	    close_pipes(ifd, ofd, opts->read_write);
+	    errno = EMFILE;
+	    return ERL_DRV_ERROR_ERRNO;
+	}
+	break;
+    default:
+	ASSERT(0);
+	return ERL_DRV_ERROR_GENERAL;
+    }
+
+    if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
+	/* started with spawn_executable, not with spawn */
+	len = strlen(name);
+	cmd_line = (char *) erts_alloc_fnf(ERTS_ALC_T_TMP, len + 1);
+	if (!cmd_line) {
+	    close_pipes(ifd, ofd, opts->read_write);
+	    errno = ENOMEM;
+	    return ERL_DRV_ERROR_ERRNO;
+	}
+	memcpy((void *) cmd_line,(void *) name, len);
+	cmd_line[len] = '\0';
+	if (access(cmd_line,X_OK) != 0) {
+	    int save_errno = errno;
+	    erts_free(ERTS_ALC_T_TMP, cmd_line);
+	    errno = save_errno;
+	    return ERL_DRV_ERROR_ERRNO;
+	}
+    } else {
+	/* make the string suitable for giving to "sh" */
+	len = strlen(name);
+	cmd_line = (char *) erts_alloc_fnf(ERTS_ALC_T_TMP,
+					   CMD_LINE_PREFIX_STR_SZ + len + 1);
+	if (!cmd_line) {
+	    close_pipes(ifd, ofd, opts->read_write);
+	    errno = ENOMEM;
+	    return ERL_DRV_ERROR_ERRNO;
+	}
+	memcpy((void *) cmd_line,
+	       (void *) CMD_LINE_PREFIX_STR,
+	       CMD_LINE_PREFIX_STR_SZ);
+	memcpy((void *) (cmd_line + CMD_LINE_PREFIX_STR_SZ), (void *) name, len);
+	cmd_line[CMD_LINE_PREFIX_STR_SZ + len] = '\0';
+    }
+
+    erts_smp_rwmtx_rlock(&environ_rwmtx);
+
+    if (opts->envir == NULL) {
+	new_environ = environ;
+    } else if ((new_environ = build_unix_environment(opts->envir)) == NULL) {
+	erts_smp_rwmtx_runlock(&environ_rwmtx);
+	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+	errno = ENOMEM;
+	return ERL_DRV_ERROR_ERRNO;
+    } 
+
+#ifndef QNX
+    /* Block child from SIGINT and SIGUSR1. Must be before fork()
+       to be safe. */
+    block_signals();
+
+    CHLD_STAT_LOCK;
+
+    unbind = erts_sched_bind_atfork_prepare();
+
+#if !DISABLE_VFORK
+    /* See fork/vfork discussion before this function. */
+    if (no_vfork) {
+#endif
+
+	DEBUGF(("Using fork\n"));
+	pid = fork();
+
+	if (pid == 0) {
+	    /* The child! Setup child... */
+
+	    if (erts_sched_bind_atfork_child(unbind) != 0)
+		goto child_error;
+
+	    /* OBSERVE!
+	     * Keep child setup after vfork() (implemented below and in
+	     * erl_child_setup.c) up to date if changes are made here.
+	     */
+
+	    if (opts->use_stdio) {
+		if (opts->read_write & DO_READ) {
+		    /* stdout for process */
+		    if (dup2(ifd[1], 1) < 0)
+			goto child_error;
+		    if(opts->redir_stderr)
+			/* stderr for process */
+			if (dup2(ifd[1], 2) < 0)
+			    goto child_error;
+		}
+		if (opts->read_write & DO_WRITE)
+		    /* stdin for process */
+		    if (dup2(ofd[0], 0) < 0)
+			goto child_error;
+	    }
+	    else {	/* XXX will fail if ofd[0] == 4 (unlikely..) */
+		if (opts->read_write & DO_READ)
+		    if (dup2(ifd[1], 4) < 0)
+			goto child_error;
+		if (opts->read_write & DO_WRITE)
+		    if (dup2(ofd[0], 3) < 0)
+			goto child_error;
+	    }
+
+#if defined(HAVE_CLOSEFROM)
+	    closefrom(opts->use_stdio ? 3 : 5);
+#else
+	    for (i = opts->use_stdio ? 3 : 5; i < sys_max_files(); i++)
+		(void) close(i);
+#endif
+
+	    if (opts->wd && chdir(opts->wd) < 0)
+		goto child_error;
+
+#if defined(USE_SETPGRP_NOARGS)		/* SysV */
+	    (void) setpgrp();
+#elif defined(USE_SETPGRP)		/* BSD */
+	    (void) setpgrp(0, getpid());
+#else					/* POSIX */
+	    (void) setsid();
+#endif
+	    
+	    unblock_signals();
+
+	    if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
+		if (opts->argv == NULL) {
+		    execle(cmd_line,cmd_line,(char *) NULL, new_environ);
+		} else {
+		    if (opts->argv[0] == erts_default_arg0) {
+			opts->argv[0] = cmd_line;
+		    }
+		    execve(cmd_line, opts->argv, new_environ);
+		    if (opts->argv[0] == cmd_line) {
+			opts->argv[0] = erts_default_arg0;
+		    }
+		}
+	    } else {
+		execle(SHELL, "sh", "-c", cmd_line, (char *) NULL, new_environ);
+	    }
+	child_error:
+	    _exit(1);
+	}
+#if !DISABLE_VFORK
+    }
+#define ENOUGH_BYTES (44)
+    else { /* Use vfork() */
+	char **cs_argv= erts_alloc(ERTS_ALC_T_TMP,(CS_ARGV_NO_OF_ARGS + 1)*
+				   sizeof(char *));
+	char fd_close_range[ENOUGH_BYTES];                  /* 44 bytes are enough to  */
+	char dup2_op[CS_ARGV_NO_OF_DUP2_OPS][ENOUGH_BYTES]; /* hold any "%d:%d" string */
+                                                            /* on a 64-bit machine.    */
+
+	/* Setup argv[] for the child setup program (implemented in
+	   erl_child_setup.c) */
+	i = 0;
+	if (opts->use_stdio) {
+	    if (opts->read_write & DO_READ){
+		/* stdout for process */
+		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 1);
+		if(opts->redir_stderr)
+		    /* stderr for process */
+		    erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 2);
+	    }
+	    if (opts->read_write & DO_WRITE)
+		/* stdin for process */
+		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ofd[0], 0);
+	} else {	/* XXX will fail if ofd[0] == 4 (unlikely..) */
+	    if (opts->read_write & DO_READ)
+		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 4);
+	    if (opts->read_write & DO_WRITE)
+		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ofd[0], 3);
+	}
+	for (; i < CS_ARGV_NO_OF_DUP2_OPS; i++)
+	    strcpy(&dup2_op[i][0], "-");
+	erts_snprintf(fd_close_range, ENOUGH_BYTES, "%d:%d", opts->use_stdio ? 3 : 5, sys_max_files()-1);
+
+	cs_argv[CS_ARGV_PROGNAME_IX] = child_setup_prog;
+	cs_argv[CS_ARGV_WD_IX] = opts->wd ? opts->wd : ".";
+	cs_argv[CS_ARGV_UNBIND_IX] = erts_sched_bind_atvfork_child(unbind);
+	cs_argv[CS_ARGV_FD_CR_IX] = fd_close_range;
+	for (i = 0; i < CS_ARGV_NO_OF_DUP2_OPS; i++)
+	    cs_argv[CS_ARGV_DUP2_OP_IX(i)] = &dup2_op[i][0];
+
+	if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
+	    int num = 0;
+	    int j = 0;
+	    if (opts->argv != NULL) {
+		for(; opts->argv[num] != NULL; ++num)
+		    ;
+	    }
+	    cs_argv = erts_realloc(ERTS_ALC_T_TMP,cs_argv, (CS_ARGV_NO_OF_ARGS + 1 + num + 1) * sizeof(char *));
+	    cs_argv[CS_ARGV_CMD_IX] = "-";
+	    cs_argv[CS_ARGV_NO_OF_ARGS] = cmd_line;
+	    if (opts->argv != NULL) {
+		for (;opts->argv[j] != NULL; ++j) {
+		    if (opts->argv[j] == erts_default_arg0) {
+			cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = cmd_line;
+		    } else {
+			cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = opts->argv[j];
+		    }
+		}
+	    }
+	    cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = NULL;
+	} else {
+	    cs_argv[CS_ARGV_CMD_IX] = cmd_line; /* Command */
+	    cs_argv[CS_ARGV_NO_OF_ARGS] = NULL;
+	}
+	DEBUGF(("Using vfork\n"));
+	pid = vfork();
+
+	if (pid == 0) {
+	    /* The child! */
+
+	    /* Observe!
+	     * OTP-4389: The child setup program (implemented in
+	     * erl_child_setup.c) will perform the necessary setup of the
+	     * child before it execs to the user program. This because
+	     * vfork() only allow an *immediate* execve() or _exit() in the
+	     * child.
+	     */
+	    execve(child_setup_prog, cs_argv, new_environ);
+	    _exit(1);
+	}
+	erts_free(ERTS_ALC_T_TMP,cs_argv);
+    }
+#undef ENOUGH_BYTES
+#endif
+
+    erts_sched_bind_atfork_parent(unbind);
+
+    if (pid == -1) {
+        saved_errno = errno;
+	CHLD_STAT_UNLOCK;
+	erts_smp_rwmtx_runlock(&environ_rwmtx);
+	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+        unblock_signals();
+        close_pipes(ifd, ofd, opts->read_write);
+	errno = saved_errno;
+	return ERL_DRV_ERROR_ERRNO;
+    }
+#else /* QNX */
+    if (opts->use_stdio) {
+	if (opts->read_write & DO_READ)
+	    qnx_spawn_options.iov[1] = ifd[1];  /* stdout for process */
+	if (opts->read_write & DO_WRITE)
+	    qnx_spawn_options.iov[0] = ofd[0];  /* stdin for process */
+	} 
+    else {
+	if (opts->read_write & DO_READ)
+	    qnx_spawn_options.iov[4] = ifd[1];
+	if (opts->read_write & DO_WRITE)
+	    qnx_spawn_options.iov[3] = ofd[0];
+    }
+    /* Close fds on exec */
+    for (i = 3; i < sys_max_files(); i++)
+	fcntl(i, F_SETFD, 1);
+
+    qnx_spawn_options.flags = _SPAWN_SETSID;
+    if ((pid = spawnl(P_NOWAIT, SHELL, SHELL, "-c", cmd_line, 
+                      (char *) 0)) < 0) {
+	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+        reset_qnx_spawn();
+	erts_smp_rwmtx_runlock(&environ_rwmtx);
+	close_pipes(ifd, ofd, opts->read_write);
+	return ERL_DRV_ERROR_GENERAL;
+    }
+    reset_qnx_spawn();
+#endif /* QNX */
+
+    erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+
+    if (new_environ != environ)
+	erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
+
+    if (opts->read_write & DO_READ) 
+	(void) close(ifd[1]);
+    if (opts->read_write & DO_WRITE)
+	(void) close(ofd[0]);
+	
+    if (opts->read_write & DO_READ) {
+	SET_NONBLOCKING(ifd[0]);
+	init_fd_data(ifd[0], port_num);
+    }
+    if (opts->read_write & DO_WRITE) {
+	SET_NONBLOCKING(ofd[1]);
+        init_fd_data(ofd[1], port_num);
+    }
+
+    res = set_driver_data(port_num, ifd[0], ofd[1], opts->packet_bytes,
+			  opts->read_write, opts->exit_status, pid, 0);
+    /* Don't unblock SIGCHLD until now, since the call above must
+       first complete putting away the info about our new subprocess. */
+    unblock_signals();
+
+#if CHLDWTHR
+    ASSERT(children_alive >= 0);
+
+    if (!(children_alive++))
+	CHLD_STAT_SIGNAL; /* Wake up child waiter thread if no children
+			     was alive before we fork()ed ... */
+#endif
+    /* Don't unlock chld_stat_mtx until now of the same reason as above */
+    CHLD_STAT_UNLOCK;
+
+    erts_smp_rwmtx_runlock(&environ_rwmtx);
+
+    return (ErlDrvData)res;
+#undef CMD_LINE_PREFIX_STR
+#undef CMD_LINE_PREFIX_STR_SZ
+}
+
+#ifdef QNX
+static reset_qnx_spawn()
+{
+    int i;
+
+    /* Reset qnx_spawn_options */
+    qnx_spawn_options.flags = 0; 
+    qnx_spawn_options.iov[0] = 0xff;
+    qnx_spawn_options.iov[1] = 0xff;
+    qnx_spawn_options.iov[2] = 0xff;
+    qnx_spawn_options.iov[3] = 0xff;
+}
+#endif
+
+#define FD_DEF_HEIGHT 24
+#define FD_DEF_WIDTH 80
+/* Control op */
+#define FD_CTRL_OP_GET_WINSIZE 100
+
+static int fd_get_window_size(int fd, Uint32 *width, Uint32 *height)
+{
+#ifdef TIOCGWINSZ 
+    struct winsize ws;
+    if (ioctl(fd,TIOCGWINSZ,&ws) == 0) {
+	*width = (Uint32) ws.ws_col;
+	*height = (Uint32) ws.ws_row;
+	return 0;
+    }
+#endif
+    return -1;
+}
+
+static ErlDrvSSizeT fd_control(ErlDrvData drv_data,
+			       unsigned int command,
+			       char *buf, ErlDrvSizeT len,
+			       char **rbuf, ErlDrvSizeT rlen)
+{
+    int fd = (int)(long)drv_data;
+    char resbuff[2*sizeof(Uint32)];
+    switch (command) {
+    case FD_CTRL_OP_GET_WINSIZE:
+	{
+	    Uint32 w,h;
+	    if (fd_get_window_size(fd,&w,&h)) 
+		return 0;
+	    memcpy(resbuff,&w,sizeof(Uint32));
+	    memcpy(resbuff+sizeof(Uint32),&h,sizeof(Uint32));
+	}
+	break;
+    default:
+	return 0;
+    }
+    if (rlen < 2*sizeof(Uint32)) {
+	*rbuf = driver_alloc(2*sizeof(Uint32));
+    }
+    memcpy(*rbuf,resbuff,2*sizeof(Uint32));
+    return 2*sizeof(Uint32);
+}
+
+static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
+			   SysDriverOpts* opts)
+{
+    ErlDrvData res;
+    int non_blocking = 0;
+
+    if (((opts->read_write & DO_READ) && opts->ifd >= sys_max_files()) ||
+	((opts->read_write & DO_WRITE) && opts->ofd >= sys_max_files()))
+	return ERL_DRV_ERROR_GENERAL;
+
+    /*
+     * Historical:
+     *
+     * "Note about nonblocking I/O.
+     *
+     * At least on Solaris, setting the write end of a TTY to nonblocking,
+     * will set the input end to nonblocking as well (and vice-versa).
+     * If erl is run in a pipeline like this:  cat | erl
+     * the input end of the TTY will be the standard input of cat.
+     * And cat is not prepared to handle nonblocking I/O."
+     *
+     * Actually, the reason for this is not that the tty itself gets set
+     * in non-blocking mode, but that the "input end" (cat's stdin) and
+     * the "output end" (erlang's stdout) are typically the "same" file
+     * descriptor, dup()'ed from a single fd by one of this process'
+     * ancestors.
+     *
+     * The workaround for this problem used to be a rather bad kludge,
+     * interposing an extra process ("internal cat") between erlang's
+     * stdout and the original stdout, allowing erlang to set its stdout
+     * in non-blocking mode without affecting the stdin of the preceding
+     * process in the pipeline - and being a kludge, it caused all kinds
+     * of weird problems.
+     *
+     * So, this is the current logic:
+     *
+     * The only reason to set non-blocking mode on the output fd at all is
+     * if it's something that can cause a write() to block, of course,
+     * i.e. primarily if it points to a tty, socket, pipe, or fifo. 
+     *
+     * If we don't set non-blocking mode when we "should" have, and output
+     * becomes blocked, the entire runtime system will be suspended - this
+     * is normally bad of course, and can happen fairly "easily" - e.g. user
+     * hits ^S on tty - but doesn't necessarily happen.
+     * 
+     * If we do set non-blocking mode when we "shouldn't" have, the runtime
+     * system will end up seeing EOF on the input fd (due to the preceding
+     * process dying), which typically will cause the entire runtime system
+     * to terminate immediately (due to whatever erlang process is seeing
+     * the EOF taking it as a signal to halt the system). This is *very* bad.
+     * 
+     * I.e. we should take a conservative approach, and only set non-
+     * blocking mode when we a) need to, and b) are reasonably certain
+     * that it won't be a problem. And as in the example above, the problem
+     * occurs when input fd and output fd point to different "things".
+     *
+     * However, determining that they are not just the same "type" of
+     * "thing", but actually the same instance of that type of thing, is
+     * unreasonably complex in many/most cases.
+     *
+     * Also, with pipes, sockets, and fifos it's far from obvious that the
+     * user *wants* non-blocking output: If you're running erlang inside
+     * some complex pipeline, you're probably not running a real-time system
+     * that must never stop, but rather *want* it to suspend if the output
+     * channel is "full".
+     *
+     * So, the bottom line: We will only set the output fd non-blocking if
+     * it points to a tty, and either a) the input fd also points to a tty,
+     * or b) we can make sure that setting the output fd non-blocking
+     * doesn't interfere with someone else's input, via a somewhat milder
+     * kludge than the above.
+     *
+     * Also keep in mind that while this code is almost exclusively run as
+     * a result of an erlang open_port({fd,0,1}, ...), that isn't the only
+     * case - it can be called with any old pre-existing file descriptors,
+     * the relations between which (if they're even two) we can only guess
+     * at - still, we try our best...
+     *
+     * Added note OTP 18: Some systems seem to use stdout/stderr to log data
+     * using unix pipes, so we cannot allow the system to block on a write.
+     * Therefore we use an async thread to write the data to fd's that could
+     * not be set to non-blocking. When no async threads are available we
+     * fall back on the old behaviour.
+     *
+     * Also the guarantee about what is delivered to the OS has changed.
+     * Pre 18 the fd driver did no flushing of data before terminating.
+     * Now it does. This is because we want to be able to guarantee that things
+     * such as escripts and friends really have outputted all data before
+     * terminating. This could potentially block the termination of the system
+     * for a very long time, but if the user wants to terminate fast she should
+     * use erlang:halt with flush=false.
+     */
+
+    if (opts->read_write & DO_READ) {
+	init_fd_data(opts->ifd, port_num);
+    }
+    if (opts->read_write & DO_WRITE) {
+	init_fd_data(opts->ofd, port_num);
+
+	/* If we don't have a read end, all bets are off - no non-blocking. */
+	if (opts->read_write & DO_READ) {
+
+	    if (isatty(opts->ofd)) { /* output fd is a tty:-) */
+
+		if (isatty(opts->ifd)) { /* input fd is also a tty */
+
+		    /* To really do this "right", we should also check that
+		       input and output fd point to the *same* tty - but
+		       this seems like overkill; ttyname() isn't for free,
+		       and this is a very common case - and it's hard to
+		       imagine a scenario where setting non-blocking mode
+		       here would cause problems - go ahead and do it. */
+
+                    non_blocking = 1;
+		    SET_NONBLOCKING(opts->ofd);
+
+		} else {	/* output fd is a tty, input fd isn't */
+
+		    /* This is a "problem case", but also common (see the
+		       example above) - i.e. it makes sense to try a bit
+		       harder before giving up on non-blocking mode: Try to
+		       re-open the tty that the output fd points to, and if
+		       successful replace the original one with the "new" fd
+		       obtained this way, and set *that* one in non-blocking
+		       mode. (Yes, this is a kludge.)
+
+		       However, re-opening the tty may fail in a couple of
+		       (unusual) cases:
+
+		       1) The name of the tty (or an equivalent one, i.e.
+			  same major/minor number) can't be found, because
+			  it actually lives somewhere other than /dev (or
+			  wherever ttyname() looks for it), and isn't
+			  equivalent to any of those that do live in the
+			  "standard" place - this should be *very* unusual.
+
+		       2) Permissions on the tty don't allow us to open it -
+			  it's perfectly possible to have an fd open to an
+			  object whose permissions wouldn't allow us to open
+			  it. This is not as unusual as it sounds, one case
+			  is if the user has su'ed to someone else (not
+			  root) - we have a read/write fd open to the tty
+			  (because it has been inherited all the way down
+			  here), but we have neither read nor write
+			  permission for the tty.
+
+		       In these cases, we finally give up, and don't set the
+		       output fd in non-blocking mode. */
+
+		    char *tty;
+		    int nfd;
+
+		    if ((tty = ttyname(opts->ofd)) != NULL &&
+			(nfd = open(tty, O_WRONLY)) != -1) {
+			dup2(nfd, opts->ofd);
+			close(nfd);
+                        non_blocking = 1;
+			SET_NONBLOCKING(opts->ofd);
+		    }
+		}
+	    }
+	}
+    }
+    CHLD_STAT_LOCK;
+    res = (ErlDrvData)(long)set_driver_data(port_num, opts->ifd, opts->ofd,
+                                            opts->packet_bytes,
+                                            opts->read_write, 0, -1,
+                                            !non_blocking);
+    CHLD_STAT_UNLOCK;
+    return res;
+}
+
+static void clear_fd_data(int fd) 
+{
+    if (fd_data[fd].sz > 0) {
+	erts_free(ERTS_ALC_T_FD_ENTRY_BUF, (void *) fd_data[fd].buf);
+	ASSERT(erts_smp_atomic_read_nob(&sys_misc_mem_sz) >= fd_data[fd].sz);
+	erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*fd_data[fd].sz);
+    }
+    fd_data[fd].buf = NULL;
+    fd_data[fd].sz = 0;
+    fd_data[fd].remain = 0;
+    fd_data[fd].cpos = NULL;
+    fd_data[fd].psz = 0;
+}
+
+static void nbio_stop_fd(ErlDrvPort prt, int fd)
+{
+    driver_select(prt,fd,DO_READ|DO_WRITE,0);
+    clear_fd_data(fd);
+    SET_BLOCKING(fd);
+}
+
+static void fd_stop(ErlDrvData ev)  /* Does not close the fds */
+{
+    int ofd;
+    int fd = (int)(long)ev;
+    ErlDrvPort prt = driver_data[fd].port_num;
+    
+#if FDBLOCK
+    if (driver_data[fd].blocking) {
+        erts_free(ERTS_ALC_T_SYS_BLOCKING,driver_data[fd].blocking);
+        driver_data[fd].blocking = NULL;
+        erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*sizeof(ErtsSysBlocking));
+    }
+#endif
+
+    nbio_stop_fd(prt, fd);
+    ofd = driver_data[fd].ofd;
+    if (ofd != fd && ofd != -1)
+	nbio_stop_fd(prt, ofd);
+}
+
+static void fd_flush(ErlDrvData fd)
+{
+    if (!driver_data[(int)(long)fd].terminating)
+        driver_data[(int)(long)fd].terminating = 1;
+}
+
+static ErlDrvData vanilla_start(ErlDrvPort port_num, char* name,
+				SysDriverOpts* opts)
+{
+    int flags, fd;
+    ErlDrvData res;
+
+    flags = (opts->read_write == DO_READ ? O_RDONLY :
+	     opts->read_write == DO_WRITE ? O_WRONLY|O_CREAT|O_TRUNC :
+	     O_RDWR|O_CREAT);
+    if ((fd = open(name, flags, 0666)) < 0)
+	return ERL_DRV_ERROR_GENERAL;
+    if (fd >= sys_max_files()) {
+	close(fd);
+	return ERL_DRV_ERROR_GENERAL;
+    }
+    SET_NONBLOCKING(fd);
+    init_fd_data(fd, port_num);
+
+    CHLD_STAT_LOCK;
+    res = (ErlDrvData)(long)set_driver_data(port_num, fd, fd,
+                                            opts->packet_bytes,
+                                            opts->read_write, 0, -1, 0);
+    CHLD_STAT_UNLOCK;
+    return res;
+}
+
+/* Note that driver_data[fd].ifd == fd if the port was opened for reading, */
+/* otherwise (i.e. write only) driver_data[fd].ofd = fd.  */
+
+static void stop(ErlDrvData fd)
+{
+    ErlDrvPort prt;
+    int ofd;
+
+    prt = driver_data[(int)(long)fd].port_num;
+    nbio_stop_fd(prt, (int)(long)fd);
+
+    ofd = driver_data[(int)(long)fd].ofd;
+    if (ofd != (int)(long)fd && (int)(long)ofd != -1)
+	nbio_stop_fd(prt, ofd);
+    else
+	ofd = -1;
+
+    CHLD_STAT_LOCK;
+
+    /* Mark as unused. */
+    driver_data[(int)(long)fd].pid = -1;
+
+    CHLD_STAT_UNLOCK;
+
+    /* SMP note: Close has to be last thing done (open file descriptors work
+       as locks on driver_data[] entries) */
+    driver_select(prt, (int)(long)fd, ERL_DRV_USE, 0);  /* close(fd); */
+    if (ofd >= 0) {
+	driver_select(prt, (int)(long)ofd, ERL_DRV_USE, 0);  /* close(ofd); */
+    }
+}
+
+/* used by fd_driver */
+static void outputv(ErlDrvData e, ErlIOVec* ev)
+{
+    int fd = (int)(long)e;
+    ErlDrvPort ix = driver_data[fd].port_num;
+    int pb = driver_data[fd].packet_bytes;
+    int ofd = driver_data[fd].ofd;
+    ssize_t n;
+    ErlDrvSizeT sz;
+    char lb[4];
+    char* lbp;
+    ErlDrvSizeT len = ev->size;
+
+    /* (len > ((unsigned long)-1 >> (4-pb)*8)) */
+    /*    if (pb >= 0 && (len & (((ErlDrvSizeT)1 << (pb*8))) - 1) != len) {*/
+    if (((pb == 2) && (len > 0xffff)) || (pb == 1 && len > 0xff)) {
+	driver_failure_posix(ix, EINVAL);
+	return; /* -1; */
+    }
+    /* Handles 0 <= pb <= 4 only */
+    put_int32((Uint32) len, lb);
+    lbp = lb + (4-pb);
+
+    ev->iov[0].iov_base = lbp;
+    ev->iov[0].iov_len = pb;
+    ev->size += pb;
+
+    if (driver_data[fd].blocking && FDBLOCK)
+        driver_pdl_lock(driver_data[fd].blocking->pdl);
+
+    if ((sz = driver_sizeq(ix)) > 0) {
+	driver_enqv(ix, ev, 0);
+
+        if (driver_data[fd].blocking && FDBLOCK)
+            driver_pdl_unlock(driver_data[fd].blocking->pdl);
+
+	if (sz + ev->size >= (1 << 13))
+	    set_busy_port(ix, 1);
+    }
+    else if (!driver_data[fd].blocking || !FDBLOCK) {
+        /* We try to write directly if the fd in non-blocking */
+	int vsize = ev->vsize > MAX_VSIZE ? MAX_VSIZE : ev->vsize;
+
+	n = writev(ofd, (const void *) (ev->iov), vsize);
+	if (n == ev->size)
+	    return; /* 0;*/
+	if (n < 0) {
+	    if ((errno != EINTR) && (errno != ERRNO_BLOCK)) {
+		driver_failure_posix(ix, errno);
+		return; /* -1;*/
+	    }
+	    n = 0;
+	}
+	driver_enqv(ix, ev, n);  /* n is the skip value */
+	driver_select(ix, ofd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
+    }
+#if FDBLOCK
+    else {
+        if (ev->size != 0) {
+            driver_enqv(ix, ev, 0);
+            driver_pdl_unlock(driver_data[fd].blocking->pdl);
+            driver_async(ix, &driver_data[fd].blocking->pkey,
+                         fd_async, driver_data+fd, NULL);
+        } else {
+            driver_pdl_unlock(driver_data[fd].blocking->pdl);
+        }
+    }
+#endif
+    /* return 0;*/
+}
+
+/* Used by spawn_driver and vanilla driver */
+static void output(ErlDrvData e, char* buf, ErlDrvSizeT len)
+{
+    int fd = (int)(long)e;
+    ErlDrvPort ix = driver_data[fd].port_num;
+    int pb = driver_data[fd].packet_bytes;
+    int ofd = driver_data[fd].ofd;
+    ssize_t n;
+    ErlDrvSizeT sz;
+    char lb[4];
+    char* lbp;
+    struct iovec iv[2];
+
+    /* (len > ((unsigned long)-1 >> (4-pb)*8)) */
+    if (((pb == 2) && (len > 0xffff)) || (pb == 1 && len > 0xff)) {
+	driver_failure_posix(ix, EINVAL);
+	return; /* -1; */
+    }
+    put_int32(len, lb);
+    lbp = lb + (4-pb);
+
+    if ((sz = driver_sizeq(ix)) > 0) {
+	driver_enq(ix, lbp, pb);
+	driver_enq(ix, buf, len);
+	if (sz + len + pb >= (1 << 13))
+	    set_busy_port(ix, 1);
+    }
+    else {
+	iv[0].iov_base = lbp;
+	iv[0].iov_len = pb;  /* should work for pb=0 */
+	iv[1].iov_base = buf;
+	iv[1].iov_len = len;
+	n = writev(ofd, iv, 2);
+	if (n == pb+len)
+	    return; /* 0; */
+	if (n < 0) {
+	    if ((errno != EINTR) && (errno != ERRNO_BLOCK)) {
+		driver_failure_posix(ix, errno);
+		return; /* -1; */
+	    }
+	    n = 0;
+	}
+	if (n < pb) {
+	    driver_enq(ix, lbp+n, pb-n);
+	    driver_enq(ix, buf, len);
+	}
+	else {
+	    n -= pb;
+	    driver_enq(ix, buf+n, len-n);
+	}
+	driver_select(ix, ofd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
+    }
+    return; /* 0; */
+}
+
+static int port_inp_failure(ErlDrvPort port_num, int ready_fd, int res)
+				/* Result: 0 (eof) or -1 (error) */
+{
+    int err = errno;
+
+    ASSERT(res <= 0);
+    (void) driver_select(port_num, ready_fd, ERL_DRV_READ|ERL_DRV_WRITE, 0); 
+    clear_fd_data(ready_fd);
+
+    if (driver_data[ready_fd].blocking && FDBLOCK) {
+        driver_pdl_lock(driver_data[ready_fd].blocking->pdl);
+        if (driver_sizeq(driver_data[ready_fd].port_num) > 0) {
+            driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
+            /* We have stuff in the output queue, so we just
+               set the state to terminating and wait for fd_async_ready
+               to terminate the port */
+            if (res == 0)
+                driver_data[ready_fd].terminating = 2;
+            else
+                driver_data[ready_fd].terminating = -err;
+            return 0;
+        }
+        driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
+    }
+
+    if (res == 0) {
+	if (driver_data[ready_fd].report_exit) {
+	    CHLD_STAT_LOCK;
+
+	    if (driver_data[ready_fd].alive) {
+		/*
+		 * We have eof and want to report exit status, but the process
+		 * hasn't exited yet. When it does report_exit_status() will
+		 * driver_select() this fd which will make sure that we get
+		 * back here with driver_data[ready_fd].alive == 0 and
+		 * driver_data[ready_fd].status set.
+		 */
+		CHLD_STAT_UNLOCK;
+		return 0;
+	    }
+	    else {
+		int status = driver_data[ready_fd].status;
+		CHLD_STAT_UNLOCK;
+
+		/* We need not be prepared for stopped/continued processes. */
+		if (WIFSIGNALED(status))
+		    status = 128 + WTERMSIG(status);
+		else
+		    status = WEXITSTATUS(status);
+
+		driver_report_exit(driver_data[ready_fd].port_num, status);
+	    }
+       }
+       driver_failure_eof(port_num);
+    } else {
+	driver_failure_posix(port_num, err);
+    }
+    return 0;
+}
+
+/* fd is the drv_data that is returned from the */
+/* initial start routine                        */
+/* ready_fd is the descriptor that is ready to read */
+
+static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
+{
+    int fd = (int)(long)e;
+    ErlDrvPort port_num;
+    int packet_bytes;
+    int res;
+    Uint h;
+
+    port_num = driver_data[fd].port_num;
+    packet_bytes = driver_data[fd].packet_bytes;
+
+
+    if (packet_bytes == 0) {
+	byte *read_buf = (byte *) erts_alloc(ERTS_ALC_T_SYS_READ_BUF,
+					     ERTS_SYS_READ_BUF_SZ);
+	res = read(ready_fd, read_buf, ERTS_SYS_READ_BUF_SZ);
+	if (res < 0) {
+	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
+		port_inp_failure(port_num, ready_fd, res);
+	}
+	else if (res == 0)
+	    port_inp_failure(port_num, ready_fd, res);
+	else 
+	    driver_output(port_num, (char*) read_buf, res);
+	erts_free(ERTS_ALC_T_SYS_READ_BUF, (void *) read_buf);
+    }
+    else if (fd_data[ready_fd].remain > 0) { /* We try to read the remainder */
+	/* space is allocated in buf */
+	res = read(ready_fd, fd_data[ready_fd].cpos, 
+		   fd_data[ready_fd].remain);
+	if (res < 0) {
+	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
+		port_inp_failure(port_num, ready_fd, res);
+	}
+	else if (res == 0) {
+	    port_inp_failure(port_num, ready_fd, res);
+	}
+	else if (res == fd_data[ready_fd].remain) { /* we're done  */
+	    driver_output(port_num, fd_data[ready_fd].buf, 
+			  fd_data[ready_fd].sz);
+	    clear_fd_data(ready_fd);
+	}
+	else { /*  if (res < fd_data[ready_fd].remain) */
+	    fd_data[ready_fd].cpos += res;
+	    fd_data[ready_fd].remain -= res;
+	}
+    }
+    else if (fd_data[ready_fd].remain == 0) { /* clean fd */
+	byte *read_buf = (byte *) erts_alloc(ERTS_ALC_T_SYS_READ_BUF,
+					     ERTS_SYS_READ_BUF_SZ);
+	/* We make one read attempt and see what happens */
+	res = read(ready_fd, read_buf, ERTS_SYS_READ_BUF_SZ);
+	if (res < 0) {  
+	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
+		port_inp_failure(port_num, ready_fd, res);
+	}
+	else if (res == 0) {     	/* eof */
+	    port_inp_failure(port_num, ready_fd, res);
+	} 
+	else if (res < packet_bytes - fd_data[ready_fd].psz) { 
+	    memcpy(fd_data[ready_fd].pbuf+fd_data[ready_fd].psz,
+		   read_buf, res);
+	    fd_data[ready_fd].psz += res;
+	}
+	else  { /* if (res >= packet_bytes) */
+	    unsigned char* cpos = read_buf;
+	    int bytes_left = res;
+
+	    while (1) {
+		int psz = fd_data[ready_fd].psz;
+		char* pbp = fd_data[ready_fd].pbuf + psz;
+
+		while(bytes_left && (psz < packet_bytes)) {
+		    *pbp++ = *cpos++;
+		    bytes_left--;
+		    psz++;
+		}
+		
+		if (psz < packet_bytes) {
+		    fd_data[ready_fd].psz = psz;
+		    break;
+		}
+		fd_data[ready_fd].psz = 0;
+
+		switch (packet_bytes) {
+		case 1: h = get_int8(fd_data[ready_fd].pbuf);  break;
+		case 2: h = get_int16(fd_data[ready_fd].pbuf); break;
+		case 4: h = get_int32(fd_data[ready_fd].pbuf); break;
+		default: ASSERT(0); return; /* -1; */
+		}
+
+		if (h <= (bytes_left)) {
+		    driver_output(port_num, (char*) cpos, h);
+		    cpos += h;
+		    bytes_left -= h;
+		    continue;
+		}
+		else {		/* The last message we got was split */
+		        char *buf = erts_alloc_fnf(ERTS_ALC_T_FD_ENTRY_BUF, h);
+		    if (!buf) {
+			errno = ENOMEM;
+			port_inp_failure(port_num, ready_fd, -1);
+		    }
+		    else {
+			erts_smp_atomic_add_nob(&sys_misc_mem_sz, h);
+			sys_memcpy(buf, cpos, bytes_left);
+			fd_data[ready_fd].buf = buf;
+			fd_data[ready_fd].sz = h;
+			fd_data[ready_fd].remain = h - bytes_left;
+			fd_data[ready_fd].cpos = buf + bytes_left;
+		    }
+		    break;
+		}
+	    }
+	}
+	erts_free(ERTS_ALC_T_SYS_READ_BUF, (void *) read_buf);
+    }
+}
+
+
+/* fd is the drv_data that is returned from the */
+/* initial start routine                        */
+/* ready_fd is the descriptor that is ready to read */
+
+static void ready_output(ErlDrvData e, ErlDrvEvent ready_fd)
+{
+    int fd = (int)(long)e;
+    ErlDrvPort ix = driver_data[fd].port_num;
+    int n;
+    struct iovec* iv;
+    int vsize;
+    
+
+    if ((iv = (struct iovec*) driver_peekq(ix, &vsize)) == NULL) {
+	driver_select(ix, ready_fd, ERL_DRV_WRITE, 0);
+        if (driver_data[fd].terminating)
+            driver_failure_atom(driver_data[fd].port_num,"normal");
+	return; /* 0; */
+    }
+    vsize = vsize > MAX_VSIZE ? MAX_VSIZE : vsize;
+    if ((n = writev(ready_fd, iv, vsize)) > 0) {
+	if (driver_deq(ix, n) == 0)
+	    set_busy_port(ix, 0);
+    }
+    else if (n < 0) {
+	if (errno == ERRNO_BLOCK || errno == EINTR)
+	    return; /* 0; */
+	else {
+	    int res = errno;
+	    driver_select(ix, ready_fd, ERL_DRV_WRITE, 0);
+	    driver_failure_posix(ix, res);
+	    return; /* -1; */
+	}
+    }
+    return; /* 0; */
+}
+
+static void stop_select(ErlDrvEvent fd, void* _)
+{
+    close((int)fd);
+}
+
+#if FDBLOCK
+
+static void
+fd_async(void *async_data)
+{
+    int res;
+    ErtsSysDriverData *dd = (ErtsSysDriverData*)async_data;
+    SysIOVec      *iov0;
+    SysIOVec      *iov;
+    int            iovlen;
+    int            err = 0;
+    /* much of this code is stolen from efile_drv:invoke_writev */
+    driver_pdl_lock(dd->blocking->pdl);
+    iov0 = driver_peekq(dd->port_num, &iovlen);
+    iovlen = iovlen < MAXIOV ? iovlen : MAXIOV;
+    iov = erts_alloc_fnf(ERTS_ALC_T_SYS_WRITE_BUF,
+                         sizeof(SysIOVec)*iovlen);
+    if (!iov) {
+        res = -1;
+        err = ENOMEM;
+        driver_pdl_unlock(dd->blocking->pdl);
+    } else {
+        memcpy(iov,iov0,iovlen*sizeof(SysIOVec));
+        driver_pdl_unlock(dd->blocking->pdl);
+
+        do {
+            res = writev(dd->ofd, iov, iovlen);
+        } while (res < 0 && errno == EINTR);
+        if (res < 0)
+            err = errno;
+        err = errno;
+
+        erts_free(ERTS_ALC_T_SYS_WRITE_BUF, iov);
+    }
+    dd->blocking->res = res;
+    dd->blocking->err = err;
+}
+
+void fd_ready_async(ErlDrvData drv_data,
+                    ErlDrvThreadData thread_data) {
+    ErtsSysDriverData *dd = (ErtsSysDriverData *)thread_data;
+    ErlDrvPort port_num = dd->port_num;
+
+    ASSERT(dd->blocking);
+    ASSERT(dd == (driver_data + (int)(long)drv_data));
+
+    if (dd->blocking->res > 0) {
+        driver_pdl_lock(dd->blocking->pdl);
+        if (driver_deq(port_num, dd->blocking->res) == 0) {
+            driver_pdl_unlock(dd->blocking->pdl);
+            set_busy_port(port_num, 0);
+            if (dd->terminating) {
+                /* The port is has been ordered to terminate
+                   from either fd_flush or port_inp_failure */
+                if (dd->terminating == 1)
+                    driver_failure_atom(port_num, "normal");
+                else if (dd->terminating == 2)
+                    driver_failure_eof(port_num);
+                else if (dd->terminating < 0)
+                    driver_failure_posix(port_num, -dd->terminating);
+                return; /* -1; */
+            }
+        } else {
+            driver_pdl_unlock(dd->blocking->pdl);
+            /* still data left to write in queue */
+            driver_async(port_num, &dd->blocking->pkey, fd_async, dd, NULL);
+            return /* 0; */;
+        }
+    } else if (dd->blocking->res < 0) {
+        if (dd->blocking->err == ERRNO_BLOCK) {
+            set_busy_port(port_num, 1);
+            /* still data left to write in queue */
+            driver_async(port_num, &dd->blocking->pkey, fd_async, dd, NULL);
+        } else
+            driver_failure_posix(port_num, dd->blocking->err);
+        return; /* -1; */
+    }
+    return; /* 0; */
+}
+
+#endif
+
+static ERTS_INLINE void
+report_exit_status(ErtsSysReportExit *rep, int status)
+{
+    Port *pp;
+#ifdef ERTS_SMP
+    CHLD_STAT_UNLOCK;
+    pp = erts_thr_id2port_sflgs(rep->port,
+				ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP);
+    CHLD_STAT_LOCK;
+#else
+    pp = erts_id2port_sflgs(rep->port,
+			    NULL,
+			    0,
+			    ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP);
+#endif
+    if (pp) {
+	if (rep->ifd >= 0) {
+	    driver_data[rep->ifd].alive = 0;
+	    driver_data[rep->ifd].status = status;
+	    (void) driver_select(ERTS_Port2ErlDrvPort(pp),
+				 rep->ifd,
+				 (ERL_DRV_READ|ERL_DRV_USE),
+				 1);
+	}
+	if (rep->ofd >= 0) {
+	    driver_data[rep->ofd].alive = 0;
+	    driver_data[rep->ofd].status = status;
+	    (void) driver_select(ERTS_Port2ErlDrvPort(pp),
+				 rep->ofd,
+				 (ERL_DRV_WRITE|ERL_DRV_USE),
+				 1);
+	}
+#ifdef ERTS_SMP
+	erts_thr_port_release(pp);
+#else
+	erts_port_release(pp);
+#endif
+    }
+    erts_free(ERTS_ALC_T_PRT_REP_EXIT, rep);
+}
+
+#if !CHLDWTHR  /* ---------------------------------------------------------- */
+
+#define ERTS_REPORT_EXIT_STATUS report_exit_status
+
+int check_children(void)
+{
+    int res = 0;
+    int pid;
+    int status;
+
+#ifndef ERTS_SMP
+    if (children_died)
+#endif
+    {
+	sys_sigblock(SIGCHLD);
+	CHLD_STAT_LOCK;
+	while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
+	    note_child_death(pid, status);
+#ifndef ERTS_SMP
+	children_died = 0;
+#endif
+	CHLD_STAT_UNLOCK;
+	sys_sigrelease(SIGCHLD);
+	res = 1;
+    }
+    return res;
+}
+
+#ifdef ERTS_SMP
+
+void
+erts_check_children(void)
+{
+    (void) check_children();
+}
+
+#endif
+
+#elif CHLDWTHR && defined(ERTS_SMP) /* ------------------------------------- */
+
+#define ERTS_REPORT_EXIT_STATUS report_exit_status
+
+int check_children(void)
+{
+    return 0;
+}
+
+#else /* CHLDWTHR && !defined(ERTS_SMP) ------------------------------------ */
+
+#define ERTS_REPORT_EXIT_STATUS initiate_report_exit_status
+
+static ERTS_INLINE void
+initiate_report_exit_status(ErtsSysReportExit *rep, int status)
+{
+    rep->next = report_exit_transit_list;
+    rep->status = status;
+    report_exit_transit_list = rep;
+    erts_sys_schedule_interrupt(1);
+}
+
+int check_children(void)
+{
+    int res;
+    ErtsSysReportExit *rep;
+    CHLD_STAT_LOCK;
+    rep = report_exit_transit_list;
+    res = rep != NULL;
+    while (rep) {
+	ErtsSysReportExit *curr_rep = rep;
+	rep = rep->next;
+	report_exit_status(curr_rep, curr_rep->status);
+    }
+    report_exit_transit_list = NULL;
+    CHLD_STAT_UNLOCK;
+    return res;
+}
+
+#endif /* ------------------------------------------------------------------ */
+
+static void note_child_death(int pid, int status)
+{
+    ErtsSysReportExit **repp = &report_exit_list;
+    ErtsSysReportExit *rep = report_exit_list;
+
+    while (rep) {
+	if (pid == rep->pid) {
+	    *repp = rep->next;
+	    ERTS_REPORT_EXIT_STATUS(rep, status);
+	    break;
+	}
+	repp = &rep->next;
+	rep = rep->next;
+    }
+}
+
+#if CHLDWTHR
+
+static void *
+child_waiter(void *unused)
+{
+  int pid;
+  int status;
+
+#ifdef ERTS_ENABLE_LOCK_CHECK
+  erts_lc_set_thread_name("child waiter");
+#endif
+
+  while(1) {
+#ifdef DEBUG
+      int waitpid_errno;
+#endif
+      pid = waitpid(-1, &status, 0);
+#ifdef DEBUG
+      waitpid_errno = errno;
+#endif
+      CHLD_STAT_LOCK;
+      if (pid < 0) {
+	  ASSERT(waitpid_errno == ECHILD);
+      }
+      else {
+	  children_alive--;
+	  ASSERT(children_alive >= 0);
+	  note_child_death(pid, status);
+      }
+      while (!children_alive)
+	  CHLD_STAT_WAIT; /* Wait for children to wait on... :) */
+      CHLD_STAT_UNLOCK;
+  }
+
+  return NULL;
+}
+
+#endif
-- 
cgit v1.2.3


From 14c7fefd51be035a44bfe42127fb4b9df92d760b Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang-solutions.com>
Date: Mon, 6 Jul 2015 17:13:52 +0200
Subject: erts: Create forker process for spawn driver

Instead of forking from the beam process, we create a separate
process in which all forks are done. This has several advantages:

1) performance:
  * don't have to close all fd's in the world
  * fork only has to copy stuff from a small process
  * work is done in a completely seperate process
  * a 3x performance increase has been measured,
    can be made even greater (10x) if we cache the
    environment in child setup

2) stability
  * the exec is done in another process than beam, which means that
    if the file that we exec to is on an nfs that is not available
    right now we will not block a scheduler until the nfs returns.

3) simplicity
  * don't have to deal with SIGCHLD in the erts

Unfortunately, this solution also implies some badness.

1) There will always be a seperate process running together with
   beam on unix. This could be confusing and undesirable.
2) We have to transfer the entire environment to child_setup
   for each command.

OTP-13088
---
 erts/emulator/sys/unix/erl_child_setup.c |  427 +++++--
 erts/emulator/sys/unix/erl_unix_sys.h    |   49 +-
 erts/emulator/sys/unix/sys.c             |   33 +-
 erts/emulator/sys/unix/sys_drivers.c     | 1771 ++++++++++++++----------------
 erts/emulator/sys/unix/sys_uds.c         |  125 +++
 erts/emulator/sys/unix/sys_uds.h         |   47 +
 erts/emulator/sys/win32/sys.c            |   12 +-
 7 files changed, 1368 insertions(+), 1096 deletions(-)
 create mode 100644 erts/emulator/sys/unix/sys_uds.c
 create mode 100644 erts/emulator/sys/unix/sys_uds.h

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index a3c5c20641..71c7948bf0 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -1,7 +1,7 @@
 /*
  * %CopyrightBegin%
  * 
- * Copyright Ericsson AB 2002-2009. All Rights Reserved.
+ * Copyright Ericsson AB 2002-2015. All Rights Reserved.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,109 +19,195 @@
  */
 
 /*
- * After a vfork() (or fork()) the child exec()s to this program which
- * sets up the child and exec()s to the user program (see spawn_start()
- * in sys.c and ticket OTP-4389).
+ * This program is started at erts startup and all fork's that
+ * have to be done are done in here. This is done for a couple
+ * of reasons:
+ *  - Allow usage of fork without a memory explosion.
+ *  -- we do not want to use vfork, as it blocks the VM
+ *     until the execv is done, and if the program that
+ *     is to be executed is on an NFS that is unavailable,
+ *     the execv can block for a very long time.
+ *  -- we cannot do fork inside the VM as that would temporarily
+ *     duplicate the memory usage of the VM per parallel exec.
+ *
+ * Some implementation notes:
+ *  - A single Unix Domain Socket is setup in between the VM and
+ *    this program. Over that UDS the file descriptors that should
+ *    be used to talk to the child program are sent.
+ *    The actual command to execute, together with options and the
+ *    environment, is sent over the pipe represented by the
+ *    file descriptors mentioned above. We don't send the
+ *    command over the UDS as that would increase the likely hood
+ *    that it's buffer would be full.
+ *
+ *  - Since it is this program that execv's, it has to take care of
+ *    all the SIGCHLD signals that the child programs generate. The
+ *    signals are received and the pid+exit reason is sent as data
+ *    on the UDS to the VM. The VM is then able to map the pid to the
+ *    port of the child program that just exited and deliver the status
+ *    code if requested.
  */
 
 #ifdef HAVE_CONFIG_H
 #  include "config.h"
 #endif
 
-#define NEED_CHILD_SETUP_DEFINES
-#include "sys.h"
-#include "erl_misc_utils.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/wait.h>
 
-#ifdef SIG_SIGSET		/* Old SysV */
-void sys_sigrelease(int sig)
-{
-    sigrelse(sig);
-}
-#else /* !SIG_SIGSET */
-#ifdef SIG_SIGNAL		/* Old BSD */
-sys_sigrelease(int sig)
+#include "erl_driver.h"
+#include "sys_uds.h"
+
+#define SET_CLOEXEC(fd) fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC)
+
+#if defined(__ANDROID__)
+#define SHELL "/system/bin/sh"
+#else
+#define SHELL "/bin/sh"
+#endif /* __ANDROID__ */
+
+//#define HARD_DEBUG
+#ifdef HARD_DEBUG
+#define DEBUG_PRINT(fmt, ...) fprintf(stderr, fmt "\r\n", ##__VA_ARGS__)
+#else
+#define DEBUG_PRINT(fmt, ...)
+#endif
+
+#define ABORT(fmt, ...) do {                                            \
+        fprintf(stderr, "erl_child_setup: " fmt "\r\n", ##__VA_ARGS__); \
+        abort();                                                        \
+    } while(0)
+
+#undef ASSERT
+#ifdef DEBUG
+#define ASSERT(cnd) do { if (!(cnd)) { ABORT("assertion %s failed", #cnd); } } while(0)
+#else
+#define ASSERT(cnd)
+#endif
+
+void sys_sigblock(int sig)
 {
-    sigsetmask(sigblock(0) & ~sigmask(sig));
+    sigset_t mask;
+
+    sigemptyset(&mask);
+    sigaddset(&mask, sig);
+    sigprocmask(SIG_BLOCK, &mask, (sigset_t *)NULL);
 }
-#else /* !SIG_SIGNAL */	/* The True Way - POSIX!:-) */
+
 void sys_sigrelease(int sig)
 {
     sigset_t mask;
-
     sigemptyset(&mask);
     sigaddset(&mask, sig);
     sigprocmask(SIG_UNBLOCK, &mask, (sigset_t *)NULL);
 }
-#endif /* !SIG_SIGNAL */
-#endif /* !SIG_SIGSET */
 
-#if defined(__ANDROID__)
-static int system_properties_fd(void);
-#endif /* __ANDROID__ */
+static int max_files = -1;
+static int sigchld_pipe[2];
 
-#if defined(__ANDROID__)
-#define SHELL "/system/bin/sh"
-#else
-#define SHELL "/bin/sh"
-#endif /* __ANDROID__ */
+static int
+start_new_child(int pipes[])
+{
+    int size, res, i;
+    char *buff, *o_buff;
 
+    char *cmd, *wd, **new_environ, **args = NULL, cbuff[1];
 
-int
-main(int argc, char *argv[])
-{
-    int i, from, to;
-    int erts_spawn_executable = 0;
-
-    /* OBSERVE!
-     * Keep child setup after fork() (implemented in sys.c) up to date
-     * if changes are made here.
-     */
-
-    if (argc != CS_ARGV_NO_OF_ARGS) {
-	if (argc < CS_ARGV_NO_OF_ARGS) {
-	    return 1;
-	} else {
-	    erts_spawn_executable = 1;
-	}
+    Sint cnt, flags;
+
+    /* only child executes here */
+
+    if ((res = read(pipes[0], (char*)&size, sizeof(size))) < 0) {
+        ABORT("Failed to read size from %d (%d)", pipes[0], errno);
     }
 
-    if (strcmp("false", argv[CS_ARGV_UNBIND_IX]) != 0)
-	if (erts_unbind_from_cpu_str(argv[CS_ARGV_UNBIND_IX]) != 0)
-	    return 1;
-
-    for (i = 0; i < CS_ARGV_NO_OF_DUP2_OPS; i++) {
-	if (argv[CS_ARGV_DUP2_OP_IX(i)][0] == '-'
-	    && argv[CS_ARGV_DUP2_OP_IX(i)][1] == '\0')
-	    break;
-	if (sscanf(argv[CS_ARGV_DUP2_OP_IX(i)], "%d:%d", &from, &to) != 2)
-	    return 1;
-	if (dup2(from, to) < 0)
-	    return 1;
+    buff = malloc(size);
+
+    DEBUG_PRINT("size = %d", size);
+
+    if ((res = read(pipes[0], buff, size)) != size) {
+        ABORT("Failed to read %d bytes from %d (%d,%d)",
+              size, pipes[0], res, errno);
     }
 
-    if (sscanf(argv[CS_ARGV_FD_CR_IX], "%d:%d", &from, &to) != 2)
-	return 1;
+    o_buff = buff;
 
-#if defined(HAVE_CLOSEFROM)
-    closefrom(from);
-#elif defined(__ANDROID__)
-    if (from <= to) {
-	int spfd = system_properties_fd();
-	for (i = from; i <= to; i++) {
-	    if (i != spfd) {
-		(void) close(i);
-            }
-	}
+    flags = *(int*)buff;
+    buff += sizeof(int);
+
+    DEBUG_PRINT("flags = %d", flags);
+
+    cmd = buff;
+    buff += strlen(buff) + 1;
+    if (*buff == '\0') {
+        wd = NULL;
+    } else {
+        wd = buff;
+        buff += strlen(buff) + 1;
+    }
+    buff++;
+
+    DEBUG_PRINT("wd = %s", wd);
+
+    cnt = *(int*)buff;
+    buff += sizeof(int);
+    new_environ = malloc(sizeof(char*)*(cnt + 1));
+
+    for (i = 0; i < cnt; i++, buff++) {
+        new_environ[i] = buff;
+        while(*buff != '\0') buff++;
+    }
+    new_environ[cnt] = NULL;
+
+    if (o_buff + size != buff) {
+        /* This is a spawn executable call */
+        cnt = *(int*)buff;
+        buff += sizeof(int);
+        args = malloc(sizeof(char*)*(cnt + 1));
+        for (i = 0; i < cnt; i++, buff++) {
+            args[i] = buff;
+            while(*buff != '\0') buff++;
+        }
+        args[cnt] = NULL;
+    }
+
+    if (o_buff + size != buff) {
+        ABORT("Buff error: %p, %p:%p", o_buff, o_buff+size, buff);
+    }
+
+    if (read(pipes[0], cbuff, 1) < 1)
+        goto child_error;
+
+    DEBUG_PRINT("Do that forking business: '%s'\n",cmd);
+
+    /* When the dup2'ing below is done, only
+       fd's 0, 1, 2 and maybe 3, 4 should survive the
+       exec. All other fds (i.e. the unix domain sockets
+       and stray pipe ends) should have CLOEXEC set on them
+       so they will be closed when the exec happens */
+    if (flags & FORKER_FLAG_USE_STDIO) {
+        /* stdin for process */
+        if (flags & FORKER_FLAG_DO_WRITE &&
+            dup2(pipes[0], 0) < 0)
+            goto child_error;
+        /* stdout for process */
+        if (flags & FORKER_FLAG_DO_READ &&
+            dup2(pipes[1], 1) < 0)
+            goto child_error;
     }
-#else  /* !__ANDROID__ */
-    for (i = from; i <= to; i++) {
-	(void) close(i);
+    else {	/* XXX will fail if pipes[0] == 4 (unlikely..) */
+        if (flags & FORKER_FLAG_DO_READ && dup2(pipes[1], 4) < 0)
+            goto child_error;
+        if (flags & FORKER_FLAG_DO_WRITE && dup2(pipes[0], 3) < 0)
+            goto child_error;
     }
-#endif /* HAVE_CLOSEFROM */
 
-    if (!(argv[CS_ARGV_WD_IX][0] == '.' && argv[CS_ARGV_WD_IX][1] == '\0')
-	&& chdir(argv[CS_ARGV_WD_IX]) < 0)
-	return 1;
+    if (dup2(pipes[2], 2) < 0)
+        goto child_error;
+
+    if (wd && chdir(wd) < 0)
+        goto child_error;
 
 #if defined(USE_SETPGRP_NOARGS)		/* SysV */
     (void) setpgrp();
@@ -131,34 +217,197 @@ main(int argc, char *argv[])
     (void) setsid();
 #endif
 
+    close(pipes[0]);
+    close(pipes[1]);
+    close(pipes[2]);
+
     sys_sigrelease(SIGCHLD);
-    sys_sigrelease(SIGINT);
-    sys_sigrelease(SIGUSR1);
-
-    if (erts_spawn_executable) {
-	if (argv[CS_ARGV_NO_OF_ARGS + 1] == NULL) {
-	    execl(argv[CS_ARGV_NO_OF_ARGS],argv[CS_ARGV_NO_OF_ARGS],
-		  (char *) NULL);
-	} else {
-	    execv(argv[CS_ARGV_NO_OF_ARGS],&(argv[CS_ARGV_NO_OF_ARGS + 1]));
-	}
+
+    if (args) {
+        /* spawn_executable */
+        execve(cmd, args, new_environ);
     } else {
-        execl(SHELL, "sh", "-c", argv[CS_ARGV_CMD_IX], (char *) NULL);
+        execle(SHELL, "sh", "-c", cmd, (char *) NULL, new_environ);
     }
-    return 1;
+child_error:
+    _exit(1);
+}
+
+
+/*
+ * [OTP-3906]
+ * Solaris signal management gets confused when threads are used and a
+ * lot of child processes dies. The confusion results in that SIGCHLD
+ * signals aren't delivered to the emulator which in turn results in
+ * a lot of defunct processes in the system.
+ *
+ * The problem seems to appear when a signal is frequently
+ * blocked/unblocked at the same time as the signal is frequently
+ * propagated. The child waiter thread is a workaround for this problem.
+ * The SIGCHLD signal is always blocked (in all threads), and the child
+ * waiter thread fetches the signal by a call to sigwait(). See
+ * child_waiter().
+ *
+ * This should be a non-issue since the fork:ing was moved outside of
+ * the emulator into erl_child_setup. I'm leaving the comment here
+ * for posterity. */
+
+static void handle_sigchld(int sig) {
+    int buff[2], res;
+
+    sys_sigblock(SIGCHLD);
+
+    while ((buff[0] = waitpid((pid_t)(-1), buff+1, WNOHANG)) > 0) {
+        if ((res = write(sigchld_pipe[1], buff, sizeof(buff))) <= 0)
+            ABORT("Failed to write to sigchld_pipe (%d): %d (%d)", sigchld_pipe[1], res, errno);
+        DEBUG_PRINT("Reap child %d (%d)", buff[0], buff[1]);
+    }
+
+    sys_sigrelease(SIGCHLD);
 }
 
 #if defined(__ANDROID__)
 static int system_properties_fd(void)
 {
-    int fd;
+    static int fd = -2;
     char *env;
 
+    if (fd != -2) return fd;
     env = getenv("ANDROID_PROPERTY_WORKSPACE");
     if (!env) {
+        fd = -1;
         return -1;
     }
     fd = atoi(env);
     return fd;
 }
 #endif /* __ANDROID__ */
+
+int
+main(int argc, char *argv[])
+{
+    /* This fd should be open from beam */
+    int uds_fd = 3, max_fd = 3;
+#ifndef HAVE_CLOSEFROM
+    int i;
+#endif
+    struct sigaction sa;
+
+    if (argc < 1 || sscanf(argv[1],"%d",&max_files) != 1) {
+        ABORT("Invalid arguments to child_setup");
+    }
+
+/* We close all fds except the uds from beam.
+   All other fds from now on will have the
+   CLOEXEC flags set on them. This means that we
+   only have to close a very limited number of fds
+   after we fork before the exec. */
+#if defined(HAVE_CLOSEFROM)
+    closefrom(4);
+#else
+    for (i = 4; i < max_files; i++)
+#if defined(__ANDROID__)
+        if (i != system_properties_fd())
+#endif
+        (void) close(i);
+#endif
+
+    if (pipe(sigchld_pipe) < 0) {
+        ABORT("Failed to setup sigchld pipe (%d)", errno);
+    }
+
+    SET_CLOEXEC(sigchld_pipe[0]);
+    SET_CLOEXEC(sigchld_pipe[1]);
+
+    max_fd = max_fd < sigchld_pipe[0] ? sigchld_pipe[0] : max_fd;
+
+    sa.sa_handler = &handle_sigchld;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
+    if (sigaction(SIGCHLD, &sa, 0) == -1) {
+        perror(0);
+        exit(1);
+    }
+
+    SET_CLOEXEC(uds_fd);
+
+    DEBUG_PRINT("Starting forker %d", max_files);
+
+    while (1) {
+        fd_set read_fds;
+        int res;
+        FD_ZERO(&read_fds);
+        FD_SET(uds_fd, &read_fds);
+        FD_SET(sigchld_pipe[0], &read_fds);
+        DEBUG_PRINT("child_setup selecting on %d, %d (%d)",
+                uds_fd, sigchld_pipe[0], max_fd);
+        res = select(max_fd+1, &read_fds, NULL, NULL, NULL);
+
+        if (res < 0) {
+            if (errno == EINTR) continue;
+            ABORT("Select failed: %d (%d)",res, errno);
+        }
+
+        if (FD_ISSET(uds_fd, &read_fds)) {
+            int pipes[3], res, os_pid;
+            char buff[256];
+            errno = 0;
+            if ((res = sys_uds_read(uds_fd, buff, 1, pipes, 3, MSG_DONTWAIT)) < 0) {
+                if (errno == EINTR)
+                    continue;
+                DEBUG_PRINT("erl_child_setup failed to read from uds: %d, %d", res, errno);
+                _exit(0);
+            }
+
+            if (res == 0) {
+                DEBUG_PRINT("uds was closed!");
+                _exit(0);
+            }
+            /* Since we use unix domain sockets and send the entire data in
+               one go we *should* get the entire payload at once. */
+            ASSERT(res == 1);
+            ASSERT(buff[0] == 'S');
+
+            sys_sigblock(SIGCHLD);
+
+            errno = 0;
+
+            os_pid = fork();
+            if (os_pid == 0)
+                start_new_child(pipes);
+
+            /* We write an ack here, but expect the reply on
+               the pipes[0] inside the fork */
+            res = sprintf(buff,"GO:%010d:%010d", os_pid, errno);
+            if (write(pipes[1], buff, res + 1))
+                ; /* remove gcc warning */
+
+            sys_sigrelease(SIGCHLD);
+            close(pipes[0]);
+            close(pipes[1]);
+            close(pipes[2]);
+        }
+
+        if (FD_ISSET(sigchld_pipe[0], &read_fds)) {
+            int ibuff[2];
+            char buff[256];
+            res = read(sigchld_pipe[0], ibuff, sizeof(ibuff));
+            if (res < 0) {
+                if (errno == EINTR)
+                    continue;
+                ABORT("Failed to read from sigchld pipe: %d (%d)", res, errno);
+            }
+            res = snprintf(buff, 256, "SIGCHLD:%010d:%010d", ibuff[0], ibuff[1]);
+            DEBUG_PRINT("send %s to %d", buff, uds_fd);
+            if (write(uds_fd, buff, res + 1) < 0) {
+                if (errno == EINTR)
+                    continue;
+                /* The uds was close, which most likely means that the VM
+                   has exited. This will be detected when we try to read
+                   from the uds_fd. */
+                DEBUG_PRINT("Failed to write to uds: %d (%d)", uds_fd, errno);
+            }
+        }
+    }
+    return 1;
+}
diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index a11a44c259..c46f2c1fa2 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -30,9 +30,7 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
-#ifndef QNX
 #include <memory.h>
-#endif
 
 #if defined(__sun__) && defined(__SVR4) && !defined(__EXTENSIONS__)
 #   define __EXTENSIONS__
@@ -92,11 +90,6 @@
 #include <ieeefp.h>
 #endif
 
-#ifdef QNX
-#include <process.h>
-#include <sys/qnx_glob.h>
-#endif
-
 #include <pwd.h>
 
 #ifndef HZ
@@ -136,13 +129,6 @@
 #  define ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
 #endif
 
-#ifndef ENABLE_CHILD_WAITER_THREAD
-#  ifdef ERTS_SMP
-#    define ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN
-void erts_check_children(void);
-#  endif
-#endif
-
 typedef void *GETENV_STATE;
 
 /*
@@ -310,7 +296,6 @@ typedef void (*SIGFUNC)(int);
 extern SIGFUNC sys_signal(int, SIGFUNC);
 extern void sys_sigrelease(int);
 extern void sys_sigblock(int);
-extern void sys_stop_cat(void);
 
 /*
  * Handling of floating point exceptions.
@@ -425,18 +410,14 @@ void erts_sys_unblock_fpe(int);
 #define ERTS_FP_ERROR_THOROUGH(p, f, A)	__ERTS_FP_ERROR_THOROUGH(&(p)->fp_exception, f, A)
 
 
-#ifdef NEED_CHILD_SETUP_DEFINES
-/* The child setup argv[] */
-#define CS_ARGV_PROGNAME_IX	0		/* Program name		*/
-#define CS_ARGV_UNBIND_IX	1		/* Unbind from cpu	*/
-#define CS_ARGV_WD_IX		2		/* Working directory	*/
-#define CS_ARGV_CMD_IX		3		/* Command		*/
-#define CS_ARGV_FD_CR_IX	4		/* Fd close range	*/
-#define CS_ARGV_DUP2_OP_IX(N)	((N) + 5)	/* dup2 operations	*/
+#define FORKER_ARGV_NO_OF_ARGS  3
+#define FORKER_ARGV_PROGNAME_IX	0    /* Program name                          */
+#define FORKER_ARGV_MAX_FILES	1    /* max_files                             */
 
-#define CS_ARGV_NO_OF_DUP2_OPS	3		/* Number of dup2 ops	*/
-#define CS_ARGV_NO_OF_ARGS	8		/* Number of arguments	*/
-#endif /* #ifdef NEED_CHILD_SETUP_DEFINES */
+#define FORKER_FLAG_USE_STDIO   (1 << 0)    /* dup the pipe to stdin/stderr   */
+#define FORKER_FLAG_EXIT_STATUS (1 << 1)    /* send the exit status to parent */
+#define FORKER_FLAG_DO_READ     (1 << 2)    /* dup write fd */
+#define FORKER_FLAG_DO_WRITE    (1 << 3)    /* dup read fd  */
 
 /* Threads */
 #ifdef USE_THREADS
@@ -470,20 +451,4 @@ extern jmp_buf erts_sys_sigsegv_jmp;
     } while(0)
 #endif
 
-#ifdef USE_THREADS
-#  ifdef ENABLE_CHILD_WAITER_THREAD
-#    define CHLDWTHR ENABLE_CHILD_WAITER_THREAD
-#  else
-#    define CHLDWTHR 0
-#  endif
-#  define FDBLOCK 1
-#else
-#  define CHLDWTHR 0
-#  define FDBLOCK 0
-#endif
-
-#define ERTS_SYS_SUSPEND_SIGNAL SIGUSR2
-
-int check_children(void);
-
 #endif /* #ifndef _ERL_UNIX_SYS_H */
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index 503ef5c2f6..2ad5f3b4d5 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -49,7 +49,6 @@
 #include <sys/ioctl.h>
 #endif
 
-#define NEED_CHILD_SETUP_DEFINES
 #define ERTS_WANT_BREAK_HANDLING
 #define ERTS_WANT_GOT_SIGUSR1
 #define WANT_NONBLOCKING    /* must define this to pull in defs from sys.h */
@@ -93,6 +92,7 @@ extern void erts_sys_init_float(void);
 
 extern void erl_crash_dump(char* file, int line, char* fmt, ...);
 
+
 #ifdef DEBUG
 static int debug_log = 0;
 #endif
@@ -122,6 +122,7 @@ static void smp_sig_notify(char c);
 static int sig_notify_fds[2] = {-1, -1};
 
 static int sig_suspend_fds[2] = {-1, -1};
+#define ERTS_SYS_SUSPEND_SIGNAL SIGUSR2
 
 #endif
 
@@ -307,9 +308,10 @@ MALLOC_USE_HASH(1);
 #ifdef USE_THREADS
 
 #ifdef ERTS_THR_HAVE_SIG_FUNCS
+
 /*
  * Child thread inherits parents signal mask at creation. In order to
- * guarantee that the main thread will receive all SIGINT, SIGCHLD, and
+ * guarantee that the main thread will receive all SIGINT, and
  * SIGUSR1 signals sent to the process, we block these signals in the
  * parent thread when creating a new thread.
  */
@@ -405,7 +407,6 @@ erts_sys_pre_init(void)
 #ifdef ERTS_THR_HAVE_SIG_FUNCS
     sigemptyset(&thr_create_sigmask);
     sigaddset(&thr_create_sigmask, SIGINT);   /* block interrupt */
-    sigaddset(&thr_create_sigmask, SIGCHLD);  /* block child signals */
     sigaddset(&thr_create_sigmask, SIGUSR1);  /* block user defined signal */
 #endif
 
@@ -1010,7 +1011,6 @@ erts_sys_unsetenv(char *key)
 void
 sys_init_io(void)
 {
-
 }
 
 #if (0) /* unused? */
@@ -1204,7 +1204,6 @@ erl_debug(char* fmt, ...)
 
 #endif /* DEBUG */
 
-
 /*
  * Called from schedule() when it runs out of runnable processes,
  * or when Erlang code has performed INPUT_REDUCTIONS reduction
@@ -1213,15 +1212,11 @@ erl_debug(char* fmt, ...)
 void
 erl_sys_schedule(int runnable)
 {
-#ifdef ERTS_SMP
     ERTS_CHK_IO(!runnable);
-#else
-    ERTS_CHK_IO(runnable ? 0 : !check_children());
-#endif
     ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking());
-    (void) check_children();
 }
 
+
 #ifdef ERTS_SMP
 
 static erts_smp_tid_t sig_dispatcher_tid;
@@ -1246,10 +1241,6 @@ smp_sig_notify(char c)
 static void *
 signal_dispatcher_thread_func(void *unused)
 {
-#if !CHLDWTHR
-    int initialized = 0;
-    int notify_check_children = 0;
-#endif
 #ifdef ERTS_ENABLE_LOCK_CHECK
     erts_lc_set_thread_name("signal_dispatcher");
 #endif
@@ -1287,19 +1278,7 @@ signal_dispatcher_thread_func(void *unused)
 	     */
 	    switch (buf[i]) {
 	    case 0: /* Emulator initialized */
-#if !CHLDWTHR
-		initialized = 1;
-		if (!notify_check_children)
-#endif
-		    break;
-#if !CHLDWTHR
-	    case 'C': /* SIGCHLD */
-		if (initialized)
-		    erts_smp_notify_check_children_needed();
-		else
-		    notify_check_children = 1;
-		break;
-#endif
+                break;
 	    case 'I': /* SIGINT */
 		break_requested();
 		break;
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
index e3f089fc0f..8402197924 100644
--- a/erts/emulator/sys/unix/sys_drivers.c
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -36,6 +36,7 @@
 #include <ctype.h>
 #include <sys/utsname.h>
 #include <sys/select.h>
+#include <arpa/inet.h>
 
 #ifdef ISC32
 #include <sys/bsdtypes.h>
@@ -49,26 +50,20 @@
 #include <sys/ioctl.h>
 #endif
 
-#define NEED_CHILD_SETUP_DEFINES
 #define WANT_NONBLOCKING    /* must define this to pull in defs from sys.h */
 #include "sys.h"
-#include "erl_thr_progress.h"
-
-#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
-#define __DARWIN__ 1
-#endif
 
 #ifdef USE_THREADS
 #include "erl_threads.h"
 #endif
 
-#include "erl_mseg.h"
-
 extern char **environ;
 extern erts_smp_rwmtx_t environ_rwmtx;
 
 extern erts_smp_atomic_t sys_misc_mem_sz;
 
+static Eterm forker_port;
+
 #define MAX_VSIZE 16		/* Max number of entries allowed in an I/O
 				 * vector sock_sendv().
 				 */
@@ -76,14 +71,10 @@ extern erts_smp_atomic_t sys_misc_mem_sz;
  * Don't need global.h, but erl_cpu_topology.h won't compile otherwise
  */
 #include "global.h"
-
-#include "erl_sys_driver.h"
-#include "erl_check_io.h"
 #include "erl_cpu_topology.h"
 
-#ifndef DISABLE_VFORK
-#define DISABLE_VFORK 0
-#endif
+#include "erl_sys_driver.h"
+#include "sys_uds.h"
 
 #if defined IOV_MAX
 #define MAXIOV IOV_MAX
@@ -93,32 +84,11 @@ extern erts_smp_atomic_t sys_misc_mem_sz;
 #define MAXIOV 16
 #endif
 
-/*
- * [OTP-3906]
- * Solaris signal management gets confused when threads are used and a
- * lot of child processes dies. The confusion results in that SIGCHLD
- * signals aren't delivered to the emulator which in turn results in
- * a lot of defunct processes in the system.
- *
- * The problem seems to appear when a signal is frequently
- * blocked/unblocked at the same time as the signal is frequently
- * propagated. The child waiter thread is a workaround for this problem.
- * The SIGCHLD signal is always blocked (in all threads), and the child
- * waiter thread fetches the signal by a call to sigwait(). See
- * child_waiter().
- */
-
-typedef struct ErtsSysReportExit_ ErtsSysReportExit;
-struct ErtsSysReportExit_ {
-    ErtsSysReportExit *next;
-    Eterm port;
-    int pid;
-    int ifd;
-    int ofd;
-#if CHLDWTHR && !defined(ERTS_SMP)
-    int status;
+#ifdef USE_THREADS
+#  define FDBLOCK 1
+#else
+#  define FDBLOCK 0
 #endif
-};
 
 /* Used by the fd driver iff the fd could not be set to non-blocking */
 typedef struct ErtsSysBlocking_ {
@@ -128,12 +98,21 @@ typedef struct ErtsSysBlocking_ {
     unsigned int pkey;
 } ErtsSysBlocking;
 
+typedef struct fd_data {
+    int   fd;
+    char  pbuf[4];   /* hold partial packet bytes */
+    int   psz;       /* size of pbuf */
+    char  *buf;
+    char  *cpos;
+    int   sz;
+    int   remain;  /* for input on fd */
+} ErtsSysFdData;
 
-/* This data is shared by these drivers - initialized by spawn_init() */
 typedef struct driver_data {
     ErlDrvPort port_num;
-    int ofd, packet_bytes;
-    ErtsSysReportExit *report_exit;
+    ErtsSysFdData *ofd;
+    ErtsSysFdData *ifd;
+    int packet_bytes;
     int pid;
     int alive;
     int status;
@@ -141,12 +120,11 @@ typedef struct driver_data {
     ErtsSysBlocking *blocking;
 } ErtsSysDriverData;
 
-static ErtsSysDriverData *driver_data;			/* indexed by fd */
-
-static ErtsSysReportExit *report_exit_list;
-#if CHLDWTHR && !defined(ERTS_SMP)
-static ErtsSysReportExit *report_exit_transit_list;
-#endif
+typedef struct exit_status {
+    HashBucket hb;
+    pid_t os_pid;
+    Eterm port_id;
+} ErtsSysExitStatus;
 
 #define DIR_SEPARATOR_CHAR    '/'
 
@@ -156,7 +134,6 @@ static ErtsSysReportExit *report_exit_transit_list;
 #define SHELL "/bin/sh"
 #endif /* __ANDROID__ */
 
-
 #if defined(DEBUG)
 #define ERL_BUILD_TYPE_MARKER ".debug"
 #elif defined(PURIFY)
@@ -171,103 +148,80 @@ static ErtsSysReportExit *report_exit_transit_list;
 #define ERL_BUILD_TYPE_MARKER
 #endif
 
+#ifdef DEBUG
+#define close(fd) do { int res = close(fd); ASSERT(res > -1); } while(0)
+#endif
+
 #define CHILD_SETUP_PROG_NAME	"erl_child_setup" ERL_BUILD_TYPE_MARKER
-static char *child_setup_prog;
 
-#if CHLDWTHR || defined(ERTS_SMP)
-erts_mtx_t chld_stat_mtx;
-#endif
-#if CHLDWTHR
-static erts_tid_t child_waiter_tid;
-/* chld_stat_mtx is used to protect against concurrent accesses
-   of the driver_data fields pid, alive, and status. */
-erts_cnd_t chld_stat_cnd;
-static long children_alive;
-#define CHLD_STAT_LOCK		erts_mtx_lock(&chld_stat_mtx)
-#define CHLD_STAT_UNLOCK	erts_mtx_unlock(&chld_stat_mtx)
-#define CHLD_STAT_WAIT		erts_cnd_wait(&chld_stat_cnd, &chld_stat_mtx)
-#define CHLD_STAT_SIGNAL	erts_cnd_signal(&chld_stat_cnd)
-#elif defined(ERTS_SMP) /* ------------------------------------------------- */
-#define CHLD_STAT_LOCK		erts_mtx_lock(&chld_stat_mtx)
-#define CHLD_STAT_UNLOCK	erts_mtx_unlock(&chld_stat_mtx)
-
-#else /* ------------------------------------------------------------------- */
-#define CHLD_STAT_LOCK
-#define CHLD_STAT_UNLOCK
-static volatile int children_died;
+// #define HARD_DEBUG
+#ifdef HARD_DEBUG
+#define driver_select(port_num, fd, flags, onoff)                       \
+    do {                                                                \
+        if (((flags) & ERL_DRV_READ) && onoff)                          \
+            fprintf(stderr,"%010d %p: read select %d\r\n", __LINE__, port_num, (int)fd); \
+        if (((flags) & ERL_DRV_WRITE) && onoff)                         \
+            fprintf(stderr,"%010d %p: writ select %d\r\n", __LINE__, port_num, (int)fd); \
+        if (((flags) & ERL_DRV_READ) && !onoff)                          \
+            fprintf(stderr,"%010d %p: read unsele %d\r\n", __LINE__, port_num, (int)fd); \
+        if (((flags) & ERL_DRV_WRITE) && !onoff)                         \
+            fprintf(stderr,"%010d %p: writ unsele %d\r\n", __LINE__, port_num, (int)fd); \
+        driver_select_nkp(port_num, fd, flags, onoff);                  \
+    } while(0)
 #endif
 
-typedef struct ErtsSysFdData {
-    char  pbuf[4];   /* hold partial packet bytes */
-    int   psz;       /* size of pbuf */
-    char  *buf;
-    char  *cpos;
-    int   sz;
-    int   remain;  /* for input on fd */
-} ErtsSysFdData;
-
-static ErtsSysFdData *fd_data;			/* indexed by fd */
+/*
+ * Decreasing the size of it below 16384 is not allowed.
+ */
 
-/* static FUNCTION(int, write_fill, (int, char*, int)); unused? */
-static void note_child_death(int, int);
+#define ERTS_SYS_READ_BUF_SZ (64*1024)
 
-#if CHLDWTHR
-static void* child_waiter(void *);
-#endif
+/* I. Initialization */
 
-static void block_signals(void)
+void
+erl_sys_late_init(void)
 {
-#if !CHLDWTHR
-   sys_sigblock(SIGCHLD);
-#endif
-#ifndef ERTS_SMP
-   sys_sigblock(SIGINT);
-#ifndef ETHR_UNUSABLE_SIGUSRX
-   sys_sigblock(SIGUSR1);
-#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
-#endif /* #ifndef ERTS_SMP */
-
-#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
-   sys_sigblock(ERTS_SYS_SUSPEND_SIGNAL);
+    SysDriverOpts opts;
+#ifdef ERTS_SMP
+    Port *port;
 #endif
 
-}
+    sys_signal(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
+
+    opts.packet_bytes = 0;
+    opts.use_stdio = 1;
+    opts.redir_stderr = 0;
+    opts.read_write = 0;
+    opts.hide_window = 0;
+    opts.wd = NULL;
+    opts.envir = NULL;
+    opts.exit_status = 0;
+    opts.overlapped_io = 0;
+    opts.spawn_type = ERTS_SPAWN_ANY;
+    opts.argv = NULL;
+    opts.parallelism = erts_port_parallelism;
 
-static void unblock_signals(void)
-{
-    /* Update erl_child_setup.c if changed */
-#if !CHLDWTHR
-   sys_sigrelease(SIGCHLD);
+#ifdef ERTS_SMP
+    port =
 #endif
-#ifndef ERTS_SMP
-   sys_sigrelease(SIGINT);
-#ifndef ETHR_UNUSABLE_SIGUSRX
-   sys_sigrelease(SIGUSR1);
-#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
-#endif /* #ifndef ERTS_SMP */
-
-#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
-   sys_sigrelease(ERTS_SYS_SUSPEND_SIGNAL);
+        erts_open_driver(&forker_driver, make_internal_pid(0), "forker", &opts, NULL, NULL);
+#ifdef ERTS_SMP
+    erts_mtx_unlock(port->lock);
 #endif
-
 }
 
-/************************** Port I/O *******************************/
+/* II. Prototypes */
 
+/* II.I Spawn prototypes */
+static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
+static ErlDrvSSizeT spawn_control(ErlDrvData, unsigned int, char *,
+                                  ErlDrvSizeT, char **, ErlDrvSizeT);
 
+/* II.II Vanilla prototypes */
+static ErlDrvData vanilla_start(ErlDrvPort, char*, SysDriverOpts*);
 
-/* I. Common stuff */
-
-/*
- * Decreasing the size of it below 16384 is not allowed.
- */
-
-/* II. The spawn/fd/vanilla drivers */
-
-#define ERTS_SYS_READ_BUF_SZ (64*1024)
 
-/* Driver interfaces */
-static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
+/* II.III FD prototypes */
 static ErlDrvData fd_start(ErlDrvPort, char*, SysDriverOpts*);
 #if FDBLOCK
 static void fd_async(void *);
@@ -275,10 +229,10 @@ static void fd_ready_async(ErlDrvData drv_data, ErlDrvThreadData thread_data);
 #endif
 static ErlDrvSSizeT fd_control(ErlDrvData, unsigned int, char *, ErlDrvSizeT,
 			       char **, ErlDrvSizeT);
-static ErlDrvData vanilla_start(ErlDrvPort, char*, SysDriverOpts*);
-static int spawn_init(void);
 static void fd_stop(ErlDrvData);
 static void fd_flush(ErlDrvData);
+
+/* II.IV Common prototypes */
 static void stop(ErlDrvData);
 static void ready_input(ErlDrvData, ErlDrvEvent);
 static void ready_output(ErlDrvData, ErlDrvEvent);
@@ -286,8 +240,22 @@ static void output(ErlDrvData, char*, ErlDrvSizeT);
 static void outputv(ErlDrvData, ErlIOVec*);
 static void stop_select(ErlDrvEvent, void*);
 
+/* II.V Forker prototypes */
+static int forker_init(void);
+static ErlDrvData forker_start(ErlDrvPort, char*, SysDriverOpts*);
+static void forker_stop(ErlDrvData);
+static void forker_ready_input(ErlDrvData, ErlDrvEvent);
+static void forker_ready_output(ErlDrvData, ErlDrvEvent);
+static ErlDrvSSizeT forker_control(ErlDrvData, unsigned int, char *,
+                                   ErlDrvSizeT, char **, ErlDrvSizeT);
+static void forker_add_os_pid_mapping(ErtsSysDriverData *);
+static void forker_remove_os_pid_mapping(ErtsSysDriverData *);
+
+/* III Driver entries */
+
+/* III.I The spawn driver */
 struct erl_drv_entry spawn_driver_entry = {
-    spawn_init,
+    forker_init,
     spawn_start,
     stop,
     output,
@@ -296,7 +264,7 @@ struct erl_drv_entry spawn_driver_entry = {
     "spawn",
     NULL,
     NULL,
-    NULL,
+    spawn_control,
     NULL,
     NULL,
     NULL,
@@ -306,17 +274,19 @@ struct erl_drv_entry spawn_driver_entry = {
     ERL_DRV_EXTENDED_MARKER,
     ERL_DRV_EXTENDED_MAJOR_VERSION,
     ERL_DRV_EXTENDED_MINOR_VERSION,
-    ERL_DRV_FLAG_USE_PORT_LOCKING,
+    ERL_DRV_FLAG_USE_PORT_LOCKING | ERL_DRV_FLAG_USE_INIT_ACK,
     NULL, NULL,
     stop_select
 };
+
+/* III.II The fd driver */
 struct erl_drv_entry fd_driver_entry = {
     NULL,
     fd_start,
     fd_stop,
     output,
     ready_input,
-    ready_output, 
+    ready_output,
     "fd",
     NULL,
     NULL,
@@ -339,6 +309,8 @@ struct erl_drv_entry fd_driver_entry = {
     NULL, /* process_exit */
     stop_select
 };
+
+/* III.III The vanilla driver */
 struct erl_drv_entry vanilla_driver_entry = {
     NULL,
     vanilla_start,
@@ -365,22 +337,33 @@ struct erl_drv_entry vanilla_driver_entry = {
     stop_select
 };
 
-/* Handle SIGCHLD signals. */
-#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
-static RETSIGTYPE onchld(void)
-#else
-static RETSIGTYPE onchld(int signum)
-#endif
-{
-#if CHLDWTHR
-    ASSERT(0); /* We should *never* catch a SIGCHLD signal */
-#elif defined(ERTS_SMP)
-    smp_sig_notify('C');
-#else
-    children_died = 1;
-    ERTS_CHK_IO_AS_INTR(); /* Make sure we don't sleep in poll */
-#endif
-}
+/* III.III The forker driver */
+struct erl_drv_entry forker_driver_entry = {
+    NULL,
+    forker_start,
+    forker_stop,
+    NULL,
+    forker_ready_input,
+    forker_ready_output,
+    "spawn_forker",
+    NULL,
+    NULL,
+    forker_control,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    ERL_DRV_EXTENDED_MARKER,
+    ERL_DRV_EXTENDED_MAJOR_VERSION,
+    ERL_DRV_EXTENDED_MINOR_VERSION,
+    0,
+    NULL, NULL,
+    stop_select
+};
+
+/* Untility functions */
 
 static int set_blocking_data(ErtsSysDriverData *dd) {
 
@@ -396,187 +379,94 @@ static int set_blocking_data(ErtsSysDriverData *dd) {
     return 1;
 }
 
-static int set_driver_data(ErlDrvPort port_num,
-			   int ifd,
-			   int ofd,
-			   int packet_bytes,
-			   int read_write,
-			   int exit_status,
-			   int pid,
-                           int is_blocking)
+static void init_fd_data(ErtsSysFdData *fd_data, int fd)
 {
-    Port *prt;
-    ErtsSysReportExit *report_exit;
-
-    if (!exit_status)
-	report_exit = NULL;
-    else {
-	report_exit = erts_alloc(ERTS_ALC_T_PRT_REP_EXIT,
-				 sizeof(ErtsSysReportExit));
-	report_exit->next = report_exit_list;
-	report_exit->port = erts_drvport2id(port_num);
-	report_exit->pid = pid;
-	report_exit->ifd = read_write & DO_READ ? ifd : -1;
-	report_exit->ofd = read_write & DO_WRITE ? ofd : -1;
-#if CHLDWTHR && !defined(ERTS_SMP)
-	report_exit->status = 0;
-#endif
-	report_exit_list = report_exit;
-    }
-
-    prt = erts_drvport2port(port_num);
-    if (prt != ERTS_INVALID_ERL_DRV_PORT)
-	prt->os_pid = pid;
-
-    if (read_write & DO_READ) {
-	driver_data[ifd].packet_bytes = packet_bytes;
-	driver_data[ifd].port_num = port_num;
-	driver_data[ifd].report_exit = report_exit;
-	driver_data[ifd].pid = pid;
-	driver_data[ifd].alive = 1;
-	driver_data[ifd].status = 0;
-        driver_data[ifd].terminating = 0;
-        driver_data[ifd].blocking = NULL;
-	if (read_write & DO_WRITE) {
-	    driver_data[ifd].ofd = ofd;
-            if (is_blocking && FDBLOCK)
-                if (!set_blocking_data(driver_data+ifd))
-                    return -1;
-	    if (ifd != ofd)
-		driver_data[ofd] = driver_data[ifd];  /* structure copy */
-	} else {		/* DO_READ only */
-	    driver_data[ifd].ofd = -1;
-	}
-	(void) driver_select(port_num, ifd, (ERL_DRV_READ|ERL_DRV_USE), 1);
-	return(ifd);
-    } else {			/* DO_WRITE only */
-	driver_data[ofd].packet_bytes = packet_bytes;
-	driver_data[ofd].port_num = port_num;
-	driver_data[ofd].report_exit = report_exit;
-	driver_data[ofd].ofd = ofd;
-	driver_data[ofd].pid = pid;
-	driver_data[ofd].alive = 1;
-	driver_data[ofd].status = 0;
-        driver_data[ofd].terminating = 0;
-        driver_data[ofd].blocking = NULL;
-        if (is_blocking && FDBLOCK)
-            if (!set_blocking_data(driver_data+ofd))
-                return -1;
-	return(ofd);
-    }
+    fd_data->fd = fd;
+    fd_data->buf = NULL;
+    fd_data->cpos = NULL;
+    fd_data->remain = 0;
+    fd_data->sz = 0;
+    fd_data->psz = 0;
 }
 
-static int spawn_init()
+static ErtsSysDriverData *
+create_driver_data(ErlDrvPort port_num,
+                   int ifd,
+                   int ofd,
+                   int packet_bytes,
+                   int read_write,
+                   int exit_status,
+                   int pid,
+                   int is_blocking)
 {
-   int i;
-#if CHLDWTHR
-   erts_thr_opts_t thr_opts = ERTS_THR_OPTS_DEFAULT_INITER;
-#endif
-   int res;
-   char bindir[MAXPATHLEN];
-   size_t bindirsz = sizeof(bindir);
-   Uint csp_path_sz;
-
-#if CHLDWTHR
-   thr_opts.detached = 0;
-   thr_opts.suggested_stack_size = 0; /* Smallest possible */
-   thr_opts.name = "child_waiter";
-#endif
-
-#if !DISABLE_VFORK
-   res = erts_sys_getenv_raw("BINDIR", bindir, &bindirsz);
-   if (res != 0) {
-    if (res < 0)
-        erl_exit(-1,
-        "Environment variable BINDIR is not set\n");
-    if (res > 0)
-        erl_exit(-1,
-        "Value of environment variable BINDIR is too large\n");
-   }
-   if (bindir[0] != DIR_SEPARATOR_CHAR)
-       erl_exit(-1,
-                "Environment variable BINDIR does not contain an"
-                " absolute path\n");
-   csp_path_sz = (strlen(bindir)
-                  + 1 /* DIR_SEPARATOR_CHAR */
-                  + sizeof(CHILD_SETUP_PROG_NAME)
-                  + 1);
-   child_setup_prog = erts_alloc(ERTS_ALC_T_CS_PROG_PATH, csp_path_sz);
-   erts_smp_atomic_add_nob(&sys_misc_mem_sz, csp_path_sz);
-   erts_snprintf(child_setup_prog, csp_path_sz,
-                 "%s%c%s",
-                 bindir,
-                 DIR_SEPARATOR_CHAR,
-                 CHILD_SETUP_PROG_NAME);
-#endif
-
-   report_exit_list = NULL;
-
-#ifdef USE_THREADS
-
-#if CHLDWTHR || defined(ERTS_SMP)
-    erts_mtx_init(&chld_stat_mtx, "child_status");
-#endif
-#if CHLDWTHR
-#ifndef ERTS_SMP
-    report_exit_transit_list = NULL;
-#endif
-    erts_cnd_init(&chld_stat_cnd);
-    children_alive = 0;
-#endif
-
-#if !CHLDWTHR && !defined(ERTS_SMP)
-    children_died = 0;
-#endif
-
-#endif /* USE_THREADS */
-
-   sys_signal(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
-   driver_data = (ErtsSysDriverData *)
-       erts_alloc(ERTS_ALC_T_DRV_TAB, sys_max_files() * sizeof(ErtsSysDriverData));
-   erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-			   sys_max_files() * sizeof(ErtsSysDriverData));
+    Port *prt;
+    ErtsSysDriverData *driver_data;
+    char *data;
+    int size = sizeof(ErtsSysDriverData);
 
-   for (i = 0; i < sys_max_files(); i++)
-      driver_data[i].pid = -1;
+    if (read_write & DO_READ)
+        size += sizeof(ErtsSysFdData);
 
-   fd_data = (ErtsSysFdData *)
-       erts_alloc(ERTS_ALC_T_FD_TAB, sys_max_files() * sizeof(ErtsSysFdData));
-   erts_smp_atomic_add_nob(&sys_misc_mem_sz,
-        sys_max_files() * sizeof(ErtsSysFdData));
+    if ((read_write & DO_WRITE) &&
+        ((ifd != ofd || ofd == -1) || !(read_write & DO_READ)))
+        size += sizeof(ErtsSysFdData);
 
-#if CHLDWTHR
-   sys_sigblock(SIGCHLD);
-#endif
+    data = erts_alloc(ERTS_ALC_T_DRV_TAB,size);
+    erts_smp_atomic_add_nob(&sys_misc_mem_sz, size);
 
-   sys_signal(SIGCHLD, onchld); /* Reap children */
+    driver_data = (ErtsSysDriverData*)data;
+    data += sizeof(*driver_data);
 
-#if CHLDWTHR
-   erts_thr_create(&child_waiter_tid, child_waiter, NULL, &thr_opts);
-#endif
+    prt = erts_drvport2port(port_num);
+    if (prt != ERTS_INVALID_ERL_DRV_PORT)
+	prt->os_pid = pid;
 
-   return 1;
-}
+    driver_data->packet_bytes = packet_bytes;
+    driver_data->port_num = port_num;
+    driver_data->pid = pid;
+    driver_data->alive = exit_status ? 1 : 0;
+    driver_data->status = 0;
+    driver_data->terminating = 0;
+    driver_data->blocking = NULL;
 
-static void close_pipes(int ifd[2], int ofd[2], int read_write)
-{
     if (read_write & DO_READ) {
-	(void) close(ifd[0]);
-	(void) close(ifd[1]);
+        driver_data->ifd = (ErtsSysFdData*)data;
+        data += sizeof(*driver_data->ifd);
+        init_fd_data(driver_data->ifd, ifd);
+        driver_select(port_num, ifd, (ERL_DRV_READ|ERL_DRV_USE), 1);
+    } else {
+        driver_data->ifd = NULL;
     }
+
     if (read_write & DO_WRITE) {
-	(void) close(ofd[0]);
-	(void) close(ofd[1]);
+        if (ofd != -1 && ifd == ofd && read_write & DO_READ) {
+            /* This is for when ifd and ofd are the same fd */
+            driver_data->ofd = driver_data->ifd;
+        } else {
+            driver_data->ofd = (ErtsSysFdData*)data;
+            data += sizeof(*driver_data->ofd);
+            init_fd_data(driver_data->ofd, ofd);
+        }
+        if (is_blocking && FDBLOCK)
+            if (!set_blocking_data(driver_data)) {
+                erts_free(ERTS_ALC_T_DRV_TAB, driver_data);
+                return NULL;
+            }
+    } else {
+        driver_data->ofd = NULL;
     }
+
+    return driver_data;
 }
 
-static void init_fd_data(int fd, ErlDrvPort port_num)
+/* Spawn driver */
+
+static void close_pipes(int ifd[2], int ofd[2])
 {
-    fd_data[fd].buf = NULL;
-    fd_data[fd].cpos = NULL;
-    fd_data[fd].remain = 0;
-    fd_data[fd].sz = 0;
-    fd_data[fd].psz = 0;
+    close(ifd[0]);
+    close(ifd[1]);
+    close(ofd[0]);
+    close(ofd[1]);
 }
 
 static char **build_unix_environment(char *block)
@@ -622,6 +512,10 @@ static char **build_unix_environment(char *block)
 	for (j = 0; j < len; j++) {
 	    char *s, *t;
 
+	    /* check if cpp[j] equals old
+	       before the = sign,
+	       i.e.
+	       "TMPDIR=/tmp/" */
 	    s = cpp[j];
 	    t = old;
 	    while (*s == *t && *s != '=') {
@@ -656,81 +550,43 @@ static char **build_unix_environment(char *block)
     return cpp;
 }
 
-/*
-  [arndt] In most Unix systems, including Solaris 2.5, 'fork' allocates memory
-  in swap space for the child of a 'fork', whereas 'vfork' does not do this.
-  The natural call to use here is therefore 'vfork'. Due to a bug in
-  'vfork' in Solaris 2.5 (apparently fixed in 2.6), using 'vfork'
-  can be dangerous in what seems to be these circumstances:
-      If the child code under a vfork sets the signal action to SIG_DFL
-      (or SIG_IGN)
-      for any signal which was previously set to a signal handler, the
-      state of the parent is clobbered, so that the later arrival of
-      such a signal yields a sigsegv in the parent. If the signal was
-      not set to a signal handler, but ignored, all seems to work.
-  If you change the forking code below, beware of this.
- */
-
-static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* opts)
+static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
+                              SysDriverOpts* opts)
 {
 #define CMD_LINE_PREFIX_STR "exec "
 #define CMD_LINE_PREFIX_STR_SZ (sizeof(CMD_LINE_PREFIX_STR) - 1)
 
-    int ifd[2], ofd[2], len, pid, i;
-    char **volatile new_environ; /* volatile since a vfork() then cannot
-				    cause 'new_environ' to be clobbered
-				    in the parent process. */
-    int saved_errno;
-    long res;
+    int len;
+    char **new_environ;
+    ErtsSysDriverData *res;
     char *cmd_line;
-#ifndef QNX
-    int unbind;
-#endif
-#if !DISABLE_VFORK
-    int no_vfork;
-    size_t no_vfork_sz = sizeof(no_vfork);
+    char wd_buff[MAXPATHLEN+1];
+    char *wd;
+    int ifd[2], ofd[2], stderrfd;
+
+    if (pipe(ifd) < 0) return ERL_DRV_ERROR_ERRNO;
+    errno = EMFILE;		/* default for next three conditions */
+    if (ifd[0] >= sys_max_files() || pipe(ofd) < 0) {
+        close(ifd[0]);
+        close(ifd[1]);
+        return ERL_DRV_ERROR_ERRNO;
+    }
+    if (ofd[1] >= sys_max_files()) {
+        close_pipes(ifd, ofd);
+        errno = EMFILE;
+        return ERL_DRV_ERROR_ERRNO;
+    }
 
-    no_vfork = (erts_sys_getenv_raw("ERL_NO_VFORK",
-				    (char *) &no_vfork,
-				    &no_vfork_sz) >= 0);
-#endif
+    SET_NONBLOCKING(ifd[0]);
+    SET_NONBLOCKING(ofd[1]);
 
-    switch (opts->read_write) {
-    case DO_READ:
-	if (pipe(ifd) < 0)
-	    return ERL_DRV_ERROR_ERRNO;
-	if (ifd[0] >= sys_max_files()) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = EMFILE;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	ofd[1] = -1;		/* keep purify happy */
-	break;
-    case DO_WRITE:
-	if (pipe(ofd) < 0) return ERL_DRV_ERROR_ERRNO;
-	if (ofd[1] >= sys_max_files()) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = EMFILE;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	ifd[0] = -1;		/* keep purify happy */
-	break;
-    case DO_READ|DO_WRITE:
-	if (pipe(ifd) < 0) return ERL_DRV_ERROR_ERRNO;
-	errno = EMFILE;		/* default for next two conditions */
-	if (ifd[0] >= sys_max_files() || pipe(ofd) < 0) {
-	    close_pipes(ifd, ofd, DO_READ);
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	if (ofd[1] >= sys_max_files()) {
-	    close_pipes(ifd, ofd, opts->read_write);
-	    errno = EMFILE;
-	    return ERL_DRV_ERROR_ERRNO;
-	}
-	break;
-    default:
-	ASSERT(0);
-	return ERL_DRV_ERROR_GENERAL;
+    stderrfd = opts->redir_stderr ? ifd[1] : dup(2);
+
+    if (stderrfd >= sys_max_files() || stderrfd < 0) {
+        close_pipes(ifd, ofd);
+        if (stderrfd > -1)
+            close(stderrfd);
+        return ERL_DRV_ERROR_ERRNO;
     }
 
     if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
@@ -738,15 +594,17 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* op
 	len = strlen(name);
 	cmd_line = (char *) erts_alloc_fnf(ERTS_ALC_T_TMP, len + 1);
 	if (!cmd_line) {
-	    close_pipes(ifd, ofd, opts->read_write);
+            close_pipes(ifd, ofd);
 	    errno = ENOMEM;
 	    return ERL_DRV_ERROR_ERRNO;
 	}
 	memcpy((void *) cmd_line,(void *) name, len);
 	cmd_line[len] = '\0';
+	len = len + 1;
 	if (access(cmd_line,X_OK) != 0) {
 	    int save_errno = errno;
 	    erts_free(ERTS_ALC_T_TMP, cmd_line);
+            close_pipes(ifd, ofd);
 	    errno = save_errno;
 	    return ERL_DRV_ERROR_ERRNO;
 	}
@@ -756,7 +614,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* op
 	cmd_line = (char *) erts_alloc_fnf(ERTS_ALC_T_TMP,
 					   CMD_LINE_PREFIX_STR_SZ + len + 1);
 	if (!cmd_line) {
-	    close_pipes(ifd, ofd, opts->read_write);
+            close_pipes(ifd, ofd);
 	    errno = ENOMEM;
 	    return ERL_DRV_ERROR_ERRNO;
 	}
@@ -765,6 +623,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* op
 	       CMD_LINE_PREFIX_STR_SZ);
 	memcpy((void *) (cmd_line + CMD_LINE_PREFIX_STR_SZ), (void *) name, len);
 	cmd_line[CMD_LINE_PREFIX_STR_SZ + len] = '\0';
+	len = CMD_LINE_PREFIX_STR_SZ + len + 1;
     }
 
     erts_smp_rwmtx_rlock(&environ_rwmtx);
@@ -773,283 +632,194 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* op
 	new_environ = environ;
     } else if ((new_environ = build_unix_environment(opts->envir)) == NULL) {
 	erts_smp_rwmtx_runlock(&environ_rwmtx);
+        close_pipes(ifd, ofd);
 	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
 	errno = ENOMEM;
 	return ERL_DRV_ERROR_ERRNO;
-    } 
+    }
 
-#ifndef QNX
-    /* Block child from SIGINT and SIGUSR1. Must be before fork()
-       to be safe. */
-    block_signals();
+    if (opts->wd == NULL) {
+        if ((wd = getcwd(wd_buff, MAXPATHLEN+1)) == NULL) {
+            /* on some OSs this call opens a fd in the
+               background which means that this can
+               return EMFILE */
+            int err = errno;
+            close_pipes(ifd, ofd);
+            erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+            if (new_environ != environ)
+                erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
+            erts_smp_rwmtx_runlock(&environ_rwmtx);
+            errno = err;
+            return ERL_DRV_ERROR_ERRNO;
+        }
+    } else {
+        wd = opts->wd;
+    }
 
-    CHLD_STAT_LOCK;
+    {
+        struct iovec *io_vector;
+        int buffsz = 0, iov_len = 5;
+        char nullbuff[] = "\0";
+        int j, i = 0;
+        Sint32 env_len = 0, argv_len = 0,
+            flags = (opts->use_stdio ? FORKER_FLAG_USE_STDIO : 0)
+            | (opts->exit_status ? FORKER_FLAG_EXIT_STATUS : 0)
+            | (opts->read_write & DO_READ ? FORKER_FLAG_DO_READ : 0)
+            | (opts->read_write & DO_WRITE ? FORKER_FLAG_DO_WRITE : 0);
+
+        /* count number of elements in environment */
+        while(new_environ[env_len] != NULL)
+            env_len++;
+        iov_len += 1 + env_len; /* num envs including size int */
+
+        /* count number of element in argument list */
+        if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
+            if (opts->argv != NULL) {
+                while(opts->argv[argv_len] != NULL)
+                    argv_len++;
+            } else {
+                argv_len++;
+            }
+            iov_len += 1 + argv_len; /* num argvs including size int */
+        }
 
-    unbind = erts_sched_bind_atfork_prepare();
+        io_vector = erts_alloc_fnf(ERTS_ALC_T_TMP, sizeof(struct iovec) * iov_len);
 
-#if !DISABLE_VFORK
-    /* See fork/vfork discussion before this function. */
-    if (no_vfork) {
-#endif
+        if (!io_vector) {
+            close_pipes(ifd, ofd);
+            erts_smp_rwmtx_runlock(&environ_rwmtx);
+            erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+            if (new_environ != environ)
+                erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
+            errno = ENOMEM;
+            return ERL_DRV_ERROR_ERRNO;
+        }
 
-	DEBUGF(("Using fork\n"));
-	pid = fork();
-
-	if (pid == 0) {
-	    /* The child! Setup child... */
-
-	    if (erts_sched_bind_atfork_child(unbind) != 0)
-		goto child_error;
-
-	    /* OBSERVE!
-	     * Keep child setup after vfork() (implemented below and in
-	     * erl_child_setup.c) up to date if changes are made here.
-	     */
-
-	    if (opts->use_stdio) {
-		if (opts->read_write & DO_READ) {
-		    /* stdout for process */
-		    if (dup2(ifd[1], 1) < 0)
-			goto child_error;
-		    if(opts->redir_stderr)
-			/* stderr for process */
-			if (dup2(ifd[1], 2) < 0)
-			    goto child_error;
-		}
-		if (opts->read_write & DO_WRITE)
-		    /* stdin for process */
-		    if (dup2(ofd[0], 0) < 0)
-			goto child_error;
-	    }
-	    else {	/* XXX will fail if ofd[0] == 4 (unlikely..) */
-		if (opts->read_write & DO_READ)
-		    if (dup2(ifd[1], 4) < 0)
-			goto child_error;
-		if (opts->read_write & DO_WRITE)
-		    if (dup2(ofd[0], 3) < 0)
-			goto child_error;
-	    }
+        io_vector[i].iov_base = (void*)&buffsz;
+        io_vector[i++].iov_len = sizeof(buffsz);
 
-#if defined(HAVE_CLOSEFROM)
-	    closefrom(opts->use_stdio ? 3 : 5);
-#else
-	    for (i = opts->use_stdio ? 3 : 5; i < sys_max_files(); i++)
-		(void) close(i);
-#endif
+        io_vector[i].iov_base = (void*)&flags;
+        io_vector[i++].iov_len = sizeof(flags);
+        buffsz += sizeof(flags);
 
-	    if (opts->wd && chdir(opts->wd) < 0)
-		goto child_error;
+        io_vector[i].iov_base = cmd_line;
+        io_vector[i++].iov_len = len;
+        buffsz += len;
 
-#if defined(USE_SETPGRP_NOARGS)		/* SysV */
-	    (void) setpgrp();
-#elif defined(USE_SETPGRP)		/* BSD */
-	    (void) setpgrp(0, getpid());
-#else					/* POSIX */
-	    (void) setsid();
-#endif
-	    
-	    unblock_signals();
-
-	    if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
-		if (opts->argv == NULL) {
-		    execle(cmd_line,cmd_line,(char *) NULL, new_environ);
-		} else {
-		    if (opts->argv[0] == erts_default_arg0) {
-			opts->argv[0] = cmd_line;
-		    }
-		    execve(cmd_line, opts->argv, new_environ);
-		    if (opts->argv[0] == cmd_line) {
-			opts->argv[0] = erts_default_arg0;
-		    }
-		}
-	    } else {
-		execle(SHELL, "sh", "-c", cmd_line, (char *) NULL, new_environ);
-	    }
-	child_error:
-	    _exit(1);
-	}
-#if !DISABLE_VFORK
-    }
-#define ENOUGH_BYTES (44)
-    else { /* Use vfork() */
-	char **cs_argv= erts_alloc(ERTS_ALC_T_TMP,(CS_ARGV_NO_OF_ARGS + 1)*
-				   sizeof(char *));
-	char fd_close_range[ENOUGH_BYTES];                  /* 44 bytes are enough to  */
-	char dup2_op[CS_ARGV_NO_OF_DUP2_OPS][ENOUGH_BYTES]; /* hold any "%d:%d" string */
-                                                            /* on a 64-bit machine.    */
-
-	/* Setup argv[] for the child setup program (implemented in
-	   erl_child_setup.c) */
-	i = 0;
-	if (opts->use_stdio) {
-	    if (opts->read_write & DO_READ){
-		/* stdout for process */
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 1);
-		if(opts->redir_stderr)
-		    /* stderr for process */
-		    erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 2);
-	    }
-	    if (opts->read_write & DO_WRITE)
-		/* stdin for process */
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ofd[0], 0);
-	} else {	/* XXX will fail if ofd[0] == 4 (unlikely..) */
-	    if (opts->read_write & DO_READ)
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ifd[1], 4);
-	    if (opts->read_write & DO_WRITE)
-		erts_snprintf(&dup2_op[i++][0], ENOUGH_BYTES, "%d:%d", ofd[0], 3);
-	}
-	for (; i < CS_ARGV_NO_OF_DUP2_OPS; i++)
-	    strcpy(&dup2_op[i][0], "-");
-	erts_snprintf(fd_close_range, ENOUGH_BYTES, "%d:%d", opts->use_stdio ? 3 : 5, sys_max_files()-1);
-
-	cs_argv[CS_ARGV_PROGNAME_IX] = child_setup_prog;
-	cs_argv[CS_ARGV_WD_IX] = opts->wd ? opts->wd : ".";
-	cs_argv[CS_ARGV_UNBIND_IX] = erts_sched_bind_atvfork_child(unbind);
-	cs_argv[CS_ARGV_FD_CR_IX] = fd_close_range;
-	for (i = 0; i < CS_ARGV_NO_OF_DUP2_OPS; i++)
-	    cs_argv[CS_ARGV_DUP2_OP_IX(i)] = &dup2_op[i][0];
-
-	if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
-	    int num = 0;
-	    int j = 0;
-	    if (opts->argv != NULL) {
-		for(; opts->argv[num] != NULL; ++num)
-		    ;
-	    }
-	    cs_argv = erts_realloc(ERTS_ALC_T_TMP,cs_argv, (CS_ARGV_NO_OF_ARGS + 1 + num + 1) * sizeof(char *));
-	    cs_argv[CS_ARGV_CMD_IX] = "-";
-	    cs_argv[CS_ARGV_NO_OF_ARGS] = cmd_line;
-	    if (opts->argv != NULL) {
-		for (;opts->argv[j] != NULL; ++j) {
-		    if (opts->argv[j] == erts_default_arg0) {
-			cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = cmd_line;
-		    } else {
-			cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = opts->argv[j];
-		    }
-		}
-	    }
-	    cs_argv[CS_ARGV_NO_OF_ARGS + 1 + j] = NULL;
-	} else {
-	    cs_argv[CS_ARGV_CMD_IX] = cmd_line; /* Command */
-	    cs_argv[CS_ARGV_NO_OF_ARGS] = NULL;
-	}
-	DEBUGF(("Using vfork\n"));
-	pid = vfork();
-
-	if (pid == 0) {
-	    /* The child! */
-
-	    /* Observe!
-	     * OTP-4389: The child setup program (implemented in
-	     * erl_child_setup.c) will perform the necessary setup of the
-	     * child before it execs to the user program. This because
-	     * vfork() only allow an *immediate* execve() or _exit() in the
-	     * child.
-	     */
-	    execve(child_setup_prog, cs_argv, new_environ);
-	    _exit(1);
-	}
-	erts_free(ERTS_ALC_T_TMP,cs_argv);
-    }
-#undef ENOUGH_BYTES
-#endif
+        io_vector[i].iov_base = wd;
+        io_vector[i].iov_len = strlen(io_vector[i].iov_base) + 1;
+        buffsz += io_vector[i++].iov_len;
 
-    erts_sched_bind_atfork_parent(unbind);
+        io_vector[i].iov_base = nullbuff;
+        io_vector[i++].iov_len = 1;
+        buffsz += io_vector[i-1].iov_len;
 
-    if (pid == -1) {
-        saved_errno = errno;
-	CHLD_STAT_UNLOCK;
-	erts_smp_rwmtx_runlock(&environ_rwmtx);
-	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
-        unblock_signals();
-        close_pipes(ifd, ofd, opts->read_write);
-	errno = saved_errno;
-	return ERL_DRV_ERROR_ERRNO;
-    }
-#else /* QNX */
-    if (opts->use_stdio) {
-	if (opts->read_write & DO_READ)
-	    qnx_spawn_options.iov[1] = ifd[1];  /* stdout for process */
-	if (opts->read_write & DO_WRITE)
-	    qnx_spawn_options.iov[0] = ofd[0];  /* stdin for process */
-	} 
-    else {
-	if (opts->read_write & DO_READ)
-	    qnx_spawn_options.iov[4] = ifd[1];
-	if (opts->read_write & DO_WRITE)
-	    qnx_spawn_options.iov[3] = ofd[0];
-    }
-    /* Close fds on exec */
-    for (i = 3; i < sys_max_files(); i++)
-	fcntl(i, F_SETFD, 1);
+        io_vector[i].iov_base = (void*)&env_len;
+        io_vector[i++].iov_len = sizeof(env_len);
+        buffsz += io_vector[i-1].iov_len;
 
-    qnx_spawn_options.flags = _SPAWN_SETSID;
-    if ((pid = spawnl(P_NOWAIT, SHELL, SHELL, "-c", cmd_line, 
-                      (char *) 0)) < 0) {
-	erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
-        reset_qnx_spawn();
-	erts_smp_rwmtx_runlock(&environ_rwmtx);
-	close_pipes(ifd, ofd, opts->read_write);
-	return ERL_DRV_ERROR_GENERAL;
+        for (j = 0; new_environ[j] != NULL; j++) {
+            io_vector[i].iov_base = new_environ[j];
+            io_vector[i++].iov_len = strlen(new_environ[j]) + 1;
+            buffsz += io_vector[i-1].iov_len;
+        }
+
+        /* only append arguments if this was a spawn_executable */
+        if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
+
+            io_vector[i].iov_base = (void*)&argv_len;
+            io_vector[i++].iov_len = sizeof(argv_len);
+            buffsz += io_vector[i-1].iov_len;
+
+            if (opts->argv) {
+                /* If there are arguments we copy in the references to
+                   them into the iov */
+                for (j = 0; opts->argv[j]; j++) {
+                    if (opts->argv[j] == erts_default_arg0)
+                        io_vector[i].iov_base = cmd_line;
+                    else
+                        io_vector[i].iov_base = opts->argv[j];
+                    io_vector[i].iov_len = strlen(io_vector[i].iov_base) + 1;
+                    buffsz += io_vector[i++].iov_len;
+                }
+            } else {
+                io_vector[i].iov_base = cmd_line;
+                io_vector[i].iov_len = strlen(io_vector[i].iov_base) + 1;
+                buffsz += io_vector[i++].iov_len;
+            }
+        }
+
+        /* we send the request to do the fork */
+        if (writev(ofd[1], io_vector, iov_len) < 0) {
+            int err = errno;
+            close_pipes(ifd, ofd);
+            erts_free(ERTS_ALC_T_TMP, io_vector);
+            if (new_environ != environ)
+                erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
+            erts_smp_rwmtx_runlock(&environ_rwmtx);
+            erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+            errno = err;
+            return ERL_DRV_ERROR_ERRNO;
+        }
+
+        erts_free(ERTS_ALC_T_TMP, io_vector);
     }
-    reset_qnx_spawn();
-#endif /* QNX */
 
     erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
 
     if (new_environ != environ)
 	erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
 
-    if (opts->read_write & DO_READ) 
-	(void) close(ifd[1]);
-    if (opts->read_write & DO_WRITE)
-	(void) close(ofd[0]);
-	
-    if (opts->read_write & DO_READ) {
-	SET_NONBLOCKING(ifd[0]);
-	init_fd_data(ifd[0], port_num);
-    }
-    if (opts->read_write & DO_WRITE) {
-	SET_NONBLOCKING(ofd[1]);
-        init_fd_data(ofd[1], port_num);
-    }
+    erts_smp_rwmtx_runlock(&environ_rwmtx);
 
-    res = set_driver_data(port_num, ifd[0], ofd[1], opts->packet_bytes,
-			  opts->read_write, opts->exit_status, pid, 0);
-    /* Don't unblock SIGCHLD until now, since the call above must
-       first complete putting away the info about our new subprocess. */
-    unblock_signals();
+    res = create_driver_data(port_num, ifd[0], ofd[1], opts->packet_bytes,
+                             DO_WRITE | DO_READ, opts->exit_status,
+                             0, 0);
 
-#if CHLDWTHR
-    ASSERT(children_alive >= 0);
+    {
+        /* send ofd[0] + ifd[1] + stderrfd to forker port */
+        int *fds = erts_alloc(ERTS_ALC_T_DRV_CTRL_DATA, sizeof(int)*3);
+        memset(fds, 0, sizeof(int)*3);
+        fds[0] = ofd[0];
+        fds[1] = ifd[1];
+        fds[2] = stderrfd;
+        if (erl_drv_port_control(forker_port, 'S', (char*)fds, sizeof(int)*3)) {
+            /* The forker port has been killed, we close both fd's which will
+               make open_port throw an epipe error */
+            close(ofd[0]);
+            close(ifd[1]);
+        }
+    }
 
-    if (!(children_alive++))
-	CHLD_STAT_SIGNAL; /* Wake up child waiter thread if no children
-			     was alive before we fork()ed ... */
-#endif
-    /* Don't unlock chld_stat_mtx until now of the same reason as above */
-    CHLD_STAT_UNLOCK;
+    /* we set these fds to negative to mark if
+       they should be closed after the handshake */
+    if (!(opts->read_write & DO_READ))
+        res->ifd->fd *= -1;
 
-    erts_smp_rwmtx_runlock(&environ_rwmtx);
+    if (!(opts->read_write & DO_WRITE))
+        res->ofd->fd *= -1;
 
     return (ErlDrvData)res;
 #undef CMD_LINE_PREFIX_STR
 #undef CMD_LINE_PREFIX_STR_SZ
 }
 
-#ifdef QNX
-static reset_qnx_spawn()
+static ErlDrvSSizeT spawn_control(ErlDrvData e, unsigned int cmd, char *buf,
+                                  ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
 {
-    int i;
+    ErtsSysDriverData *dd = (ErtsSysDriverData*)e;
+
+    memcpy(&dd->status, buf, sizeof(dd->status));
+    dd->alive = -1;
+
+    if (dd->ifd)
+        driver_select(dd->port_num, abs(dd->ifd->fd), ERL_DRV_READ | ERL_DRV_USE, 1);
+
+    if (dd->ofd)
+        driver_select(dd->port_num, abs(dd->ofd->fd), ERL_DRV_WRITE | ERL_DRV_USE, 1);
 
-    /* Reset qnx_spawn_options */
-    qnx_spawn_options.flags = 0; 
-    qnx_spawn_options.iov[0] = 0xff;
-    qnx_spawn_options.iov[1] = 0xff;
-    qnx_spawn_options.iov[2] = 0xff;
-    qnx_spawn_options.iov[3] = 0xff;
+    return 0;
 }
-#endif
 
 #define FD_DEF_HEIGHT 24
 #define FD_DEF_WIDTH 80
@@ -1099,7 +869,6 @@ static ErlDrvSSizeT fd_control(ErlDrvData drv_data,
 static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
 			   SysDriverOpts* opts)
 {
-    ErlDrvData res;
     int non_blocking = 0;
 
     if (((opts->read_write & DO_READ) && opts->ifd >= sys_max_files()) ||
@@ -1189,11 +958,8 @@ static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
      * use erlang:halt with flush=false.
      */
 
-    if (opts->read_write & DO_READ) {
-	init_fd_data(opts->ifd, port_num);
-    }
+    /* Try to figure out if we can use non-blocking writes */
     if (opts->read_write & DO_WRITE) {
-	init_fd_data(opts->ofd, port_num);
 
 	/* If we don't have a read end, all bets are off - no non-blocking. */
 	if (opts->read_write & DO_READ) {
@@ -1259,60 +1025,66 @@ static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
 	    }
 	}
     }
-    CHLD_STAT_LOCK;
-    res = (ErlDrvData)(long)set_driver_data(port_num, opts->ifd, opts->ofd,
-                                            opts->packet_bytes,
-                                            opts->read_write, 0, -1,
-                                            !non_blocking);
-    CHLD_STAT_UNLOCK;
-    return res;
+    return (ErlDrvData)create_driver_data(port_num, opts->ifd, opts->ofd,
+                                          opts->packet_bytes,
+                                          opts->read_write, 0, -1,
+                                          !non_blocking);
 }
 
-static void clear_fd_data(int fd) 
+static void clear_fd_data(ErtsSysFdData *fdd)
 {
-    if (fd_data[fd].sz > 0) {
-	erts_free(ERTS_ALC_T_FD_ENTRY_BUF, (void *) fd_data[fd].buf);
-	ASSERT(erts_smp_atomic_read_nob(&sys_misc_mem_sz) >= fd_data[fd].sz);
-	erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*fd_data[fd].sz);
+    if (fdd->sz > 0) {
+	erts_free(ERTS_ALC_T_FD_ENTRY_BUF, (void *) fdd->buf);
+	ASSERT(erts_smp_atomic_read_nob(&sys_misc_mem_sz) >= fdd->sz);
+	erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*fdd->sz);
     }
-    fd_data[fd].buf = NULL;
-    fd_data[fd].sz = 0;
-    fd_data[fd].remain = 0;
-    fd_data[fd].cpos = NULL;
-    fd_data[fd].psz = 0;
+    fdd->buf = NULL;
+    fdd->sz = 0;
+    fdd->remain = 0;
+    fdd->cpos = NULL;
+    fdd->psz = 0;
 }
 
-static void nbio_stop_fd(ErlDrvPort prt, int fd)
+static void nbio_stop_fd(ErlDrvPort prt, ErtsSysFdData *fdd)
 {
-    driver_select(prt,fd,DO_READ|DO_WRITE,0);
-    clear_fd_data(fd);
-    SET_BLOCKING(fd);
+    driver_select(prt, abs(fdd->fd), DO_READ|DO_WRITE, 0);
+    clear_fd_data(fdd);
+    SET_BLOCKING(abs(fdd->fd));
+
 }
 
 static void fd_stop(ErlDrvData ev)  /* Does not close the fds */
 {
-    int ofd;
-    int fd = (int)(long)ev;
-    ErlDrvPort prt = driver_data[fd].port_num;
-    
+    ErtsSysDriverData* dd = (ErtsSysDriverData*)ev;
+    ErlDrvPort prt = dd->port_num;
+    int sz = sizeof(ErtsSysDriverData);
+
 #if FDBLOCK
-    if (driver_data[fd].blocking) {
-        erts_free(ERTS_ALC_T_SYS_BLOCKING,driver_data[fd].blocking);
-        driver_data[fd].blocking = NULL;
-        erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*sizeof(ErtsSysBlocking));
+    if (dd->blocking) {
+        erts_free(ERTS_ALC_T_SYS_BLOCKING, dd->blocking);
+        dd->blocking = NULL;
+        sz += sizeof(ErtsSysBlocking);
     }
 #endif
 
-    nbio_stop_fd(prt, fd);
-    ofd = driver_data[fd].ofd;
-    if (ofd != fd && ofd != -1)
-	nbio_stop_fd(prt, ofd);
+    if (dd->ifd) {
+        sz += sizeof(ErtsSysFdData);
+        nbio_stop_fd(prt, dd->ifd);
+    }
+    if (dd->ofd && dd->ofd != dd->ifd) {
+        sz += sizeof(ErtsSysFdData);
+        nbio_stop_fd(prt, dd->ofd);
+    }
+
+     erts_free(ERTS_ALC_T_DRV_TAB, dd);
+     erts_smp_atomic_add_nob(&sys_misc_mem_sz, -sz);
 }
 
-static void fd_flush(ErlDrvData fd)
+static void fd_flush(ErlDrvData ev)
 {
-    if (!driver_data[(int)(long)fd].terminating)
-        driver_data[(int)(long)fd].terminating = 1;
+    ErtsSysDriverData* dd = (ErtsSysDriverData*)ev;
+    if (!dd->terminating)
+        dd->terminating = 1;
 }
 
 static ErlDrvData vanilla_start(ErlDrvPort port_num, char* name,
@@ -1331,55 +1103,45 @@ static ErlDrvData vanilla_start(ErlDrvPort port_num, char* name,
 	return ERL_DRV_ERROR_GENERAL;
     }
     SET_NONBLOCKING(fd);
-    init_fd_data(fd, port_num);
 
-    CHLD_STAT_LOCK;
-    res = (ErlDrvData)(long)set_driver_data(port_num, fd, fd,
-                                            opts->packet_bytes,
-                                            opts->read_write, 0, -1, 0);
-    CHLD_STAT_UNLOCK;
+    res = (ErlDrvData)(long)create_driver_data(port_num, fd, fd,
+                                               opts->packet_bytes,
+                                               opts->read_write, 0, -1, 0);
     return res;
 }
 
 /* Note that driver_data[fd].ifd == fd if the port was opened for reading, */
 /* otherwise (i.e. write only) driver_data[fd].ofd = fd.  */
 
-static void stop(ErlDrvData fd)
+static void stop(ErlDrvData ev)
 {
-    ErlDrvPort prt;
-    int ofd;
-
-    prt = driver_data[(int)(long)fd].port_num;
-    nbio_stop_fd(prt, (int)(long)fd);
+    ErtsSysDriverData* dd = (ErtsSysDriverData*)ev;
+    ErlDrvPort prt = dd->port_num;
 
-    ofd = driver_data[(int)(long)fd].ofd;
-    if (ofd != (int)(long)fd && (int)(long)ofd != -1)
-	nbio_stop_fd(prt, ofd);
-    else
-	ofd = -1;
+    if (dd->alive == 1)
+        /* Stop has been called before the exit status has been reported */
+        forker_remove_os_pid_mapping(dd);
 
-    CHLD_STAT_LOCK;
-
-    /* Mark as unused. */
-    driver_data[(int)(long)fd].pid = -1;
-
-    CHLD_STAT_UNLOCK;
+    if (dd->ifd) {
+        nbio_stop_fd(prt, dd->ifd);
+        driver_select(prt, abs(dd->ifd->fd), ERL_DRV_USE, 0);  /* close(ifd); */
+    }
 
-    /* SMP note: Close has to be last thing done (open file descriptors work
-       as locks on driver_data[] entries) */
-    driver_select(prt, (int)(long)fd, ERL_DRV_USE, 0);  /* close(fd); */
-    if (ofd >= 0) {
-	driver_select(prt, (int)(long)ofd, ERL_DRV_USE, 0);  /* close(ofd); */
+    if (dd->ofd && dd->ofd != dd->ifd) {
+	nbio_stop_fd(prt, dd->ofd);
+	driver_select(prt, abs(dd->ofd->fd), ERL_DRV_USE, 0);  /* close(ofd); */
     }
+
+    erts_free(ERTS_ALC_T_DRV_TAB, dd);
 }
 
 /* used by fd_driver */
 static void outputv(ErlDrvData e, ErlIOVec* ev)
 {
-    int fd = (int)(long)e;
-    ErlDrvPort ix = driver_data[fd].port_num;
-    int pb = driver_data[fd].packet_bytes;
-    int ofd = driver_data[fd].ofd;
+    ErtsSysDriverData *dd = (ErtsSysDriverData*)e;
+    ErlDrvPort ix = dd->port_num;
+    int pb = dd->packet_bytes;
+    int ofd = dd->ofd ? dd->ofd->fd : -1;
     ssize_t n;
     ErlDrvSizeT sz;
     char lb[4];
@@ -1400,19 +1162,19 @@ static void outputv(ErlDrvData e, ErlIOVec* ev)
     ev->iov[0].iov_len = pb;
     ev->size += pb;
 
-    if (driver_data[fd].blocking && FDBLOCK)
-        driver_pdl_lock(driver_data[fd].blocking->pdl);
+    if (dd->blocking && FDBLOCK)
+        driver_pdl_lock(dd->blocking->pdl);
 
     if ((sz = driver_sizeq(ix)) > 0) {
 	driver_enqv(ix, ev, 0);
 
-        if (driver_data[fd].blocking && FDBLOCK)
-            driver_pdl_unlock(driver_data[fd].blocking->pdl);
+        if (dd->blocking && FDBLOCK)
+            driver_pdl_unlock(dd->blocking->pdl);
 
 	if (sz + ev->size >= (1 << 13))
 	    set_busy_port(ix, 1);
     }
-    else if (!driver_data[fd].blocking || !FDBLOCK) {
+    else if (!dd->blocking || !FDBLOCK) {
         /* We try to write directly if the fd in non-blocking */
 	int vsize = ev->vsize > MAX_VSIZE ? MAX_VSIZE : ev->vsize;
 
@@ -1433,11 +1195,11 @@ static void outputv(ErlDrvData e, ErlIOVec* ev)
     else {
         if (ev->size != 0) {
             driver_enqv(ix, ev, 0);
-            driver_pdl_unlock(driver_data[fd].blocking->pdl);
-            driver_async(ix, &driver_data[fd].blocking->pkey,
-                         fd_async, driver_data+fd, NULL);
+            driver_pdl_unlock(dd->blocking->pdl);
+            driver_async(ix, &dd->blocking->pkey,
+                         fd_async, dd, NULL);
         } else {
-            driver_pdl_unlock(driver_data[fd].blocking->pdl);
+            driver_pdl_unlock(dd->blocking->pdl);
         }
     }
 #endif
@@ -1447,10 +1209,10 @@ static void outputv(ErlDrvData e, ErlIOVec* ev)
 /* Used by spawn_driver and vanilla driver */
 static void output(ErlDrvData e, char* buf, ErlDrvSizeT len)
 {
-    int fd = (int)(long)e;
-    ErlDrvPort ix = driver_data[fd].port_num;
-    int pb = driver_data[fd].packet_bytes;
-    int ofd = driver_data[fd].ofd;
+    ErtsSysDriverData *dd = (ErtsSysDriverData*)e;
+    ErlDrvPort ix = dd->port_num;
+    int pb = dd->packet_bytes;
+    int ofd = dd->ofd ? dd->ofd->fd : -1;
     ssize_t n;
     ErlDrvSizeT sz;
     char lb[4];
@@ -1458,7 +1220,9 @@ static void output(ErlDrvData e, char* buf, ErlDrvSizeT len)
     struct iovec iv[2];
 
     /* (len > ((unsigned long)-1 >> (4-pb)*8)) */
-    if (((pb == 2) && (len > 0xffff)) || (pb == 1 && len > 0xff)) {
+    if (((pb == 2) && (len > 0xffff))
+        || (pb == 1 && len > 0xff)
+        || dd->pid == 0 /* Attempt at output before port is ready */) {
 	driver_failure_posix(ix, EINVAL);
 	return; /* -1; */
     }
@@ -1499,62 +1263,58 @@ static void output(ErlDrvData e, char* buf, ErlDrvSizeT len)
     return; /* 0; */
 }
 
-static int port_inp_failure(ErlDrvPort port_num, int ready_fd, int res)
+static int port_inp_failure(ErtsSysDriverData *dd, int res)
 				/* Result: 0 (eof) or -1 (error) */
 {
     int err = errno;
 
     ASSERT(res <= 0);
-    (void) driver_select(port_num, ready_fd, ERL_DRV_READ|ERL_DRV_WRITE, 0); 
-    clear_fd_data(ready_fd);
+    if (dd->ifd) {
+        driver_select(dd->port_num, dd->ifd->fd, ERL_DRV_READ|ERL_DRV_WRITE, 0);
+        clear_fd_data(dd->ifd);
+    }
 
-    if (driver_data[ready_fd].blocking && FDBLOCK) {
-        driver_pdl_lock(driver_data[ready_fd].blocking->pdl);
-        if (driver_sizeq(driver_data[ready_fd].port_num) > 0) {
-            driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
+    if (dd->blocking && FDBLOCK) {
+        driver_pdl_lock(dd->blocking->pdl);
+        if (driver_sizeq(dd->port_num) > 0) {
+            driver_pdl_unlock(dd->blocking->pdl);
             /* We have stuff in the output queue, so we just
                set the state to terminating and wait for fd_async_ready
                to terminate the port */
             if (res == 0)
-                driver_data[ready_fd].terminating = 2;
+                dd->terminating = 2;
             else
-                driver_data[ready_fd].terminating = -err;
+                dd->terminating = -err;
             return 0;
         }
-        driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
+        driver_pdl_unlock(dd->blocking->pdl);
     }
 
     if (res == 0) {
-	if (driver_data[ready_fd].report_exit) {
-	    CHLD_STAT_LOCK;
-
-	    if (driver_data[ready_fd].alive) {
-		/*
-		 * We have eof and want to report exit status, but the process
-		 * hasn't exited yet. When it does report_exit_status() will
-		 * driver_select() this fd which will make sure that we get
-		 * back here with driver_data[ready_fd].alive == 0 and
-		 * driver_data[ready_fd].status set.
-		 */
-		CHLD_STAT_UNLOCK;
-		return 0;
-	    }
-	    else {
-		int status = driver_data[ready_fd].status;
-		CHLD_STAT_UNLOCK;
-
-		/* We need not be prepared for stopped/continued processes. */
-		if (WIFSIGNALED(status))
-		    status = 128 + WTERMSIG(status);
-		else
-		    status = WEXITSTATUS(status);
+        if (dd->alive == 1) {
+            /*
+             * We have eof and want to report exit status, but the process
+             * hasn't exited yet. When it does ready_input will
+             * driver_select() this fd which will make sure that we get
+             * back here with dd->alive == -1 and dd->status set.
+             */
+            return 0;
+        }
+        else if (dd->alive == -1) {
+            int status = dd->status;
 
-		driver_report_exit(driver_data[ready_fd].port_num, status);
-	    }
-       }
-       driver_failure_eof(port_num);
+            /* We need not be prepared for stopped/continued processes. */
+            if (WIFSIGNALED(status))
+                status = 128 + WTERMSIG(status);
+            else
+                status = WEXITSTATUS(status);
+            driver_report_exit(dd->port_num, status);
+        }
+       driver_failure_eof(dd->port_num);
+    } else if (dd->ifd) {
+        erl_drv_init_ack(dd->port_num, ERL_DRV_ERROR_ERRNO);
     } else {
-	driver_failure_posix(port_num, err);
+	driver_failure_posix(dd->port_num, err);
     }
     return 0;
 }
@@ -1565,15 +1325,70 @@ static int port_inp_failure(ErlDrvPort port_num, int ready_fd, int res)
 
 static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
 {
-    int fd = (int)(long)e;
+    ErtsSysDriverData *dd = (ErtsSysDriverData*)e;
     ErlDrvPort port_num;
     int packet_bytes;
     int res;
     Uint h;
 
-    port_num = driver_data[fd].port_num;
-    packet_bytes = driver_data[fd].packet_bytes;
+    port_num = dd->port_num;
+    packet_bytes = dd->packet_bytes;
+
+    ASSERT(abs(dd->ifd->fd) == ready_fd);
+
+    if (dd->pid == 0) {
+        /* the pid is sent from erl_child_setup. spawn driver only. */
+        char message_buffer[3 + 10 + 1 + 10 + 1];
+        int reason, res;
+
+        if((res = read(ready_fd, message_buffer, sizeof(message_buffer))) <= 0) {
+            /* hmm, child setup seems to have closed the pipe too early...
+               we close the port as there is not much else we can do */
+            if (res < 0 && errno == ERRNO_BLOCK)
+                return;
+            driver_select(port_num, ready_fd, ERL_DRV_READ, 0);
+            if (res == 0)
+                errno = EPIPE;
+            port_inp_failure(dd, -1);
+            return;
+        }
+
+        if(sscanf(message_buffer,"GO:%010d:%010d", &dd->pid, &reason) == 2) {
+            if (dd->pid == -1) {
+                /* Setup failed! The only reason why this should happen is if
+                   the fork fails. */
+                errno = reason;
+                port_inp_failure(dd, -1);
+                return;
+            }
+
+            if (write(abs(dd->ofd->fd), "A", 1) < 0)
+                ; /* do nothing on failure here. If the ofd is broken, then
+                     the ifd will probably also be broken and trigger
+                     a port_inp_failure */
+
+            if (dd->ifd->fd < 0) {
+                driver_select(port_num, abs(dd->ifd->fd), ERL_DRV_READ|ERL_DRV_USE, 0);
+                erts_smp_atomic_add_nob(&sys_misc_mem_sz, -sizeof(ErtsSysFdData));
+                dd->ifd = NULL;
+            }
+
+            if (dd->ofd->fd < 0  || driver_sizeq(port_num) > 0)
+                /* we select in order to close fd or write to queue,
+                   child setup will close this fd if fd < 0 */
+                driver_select(port_num, abs(dd->ofd->fd), ERL_DRV_WRITE|ERL_DRV_USE, 1);
+
+            if (dd->alive == 1) {
+                forker_add_os_pid_mapping(dd);
+            }
 
+            erl_drv_set_os_pid(port_num, dd->pid);
+            erl_drv_init_ack(port_num, e);
+            return;
+        }
+        ASSERT(0);
+        return;
+    }
 
     if (packet_bytes == 0) {
 	byte *read_buf = (byte *) erts_alloc(ERTS_ALC_T_SYS_READ_BUF,
@@ -1581,76 +1396,76 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
 	res = read(ready_fd, read_buf, ERTS_SYS_READ_BUF_SZ);
 	if (res < 0) {
 	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
-		port_inp_failure(port_num, ready_fd, res);
+		port_inp_failure(dd, res);
 	}
 	else if (res == 0)
-	    port_inp_failure(port_num, ready_fd, res);
-	else 
+	    port_inp_failure(dd, res);
+	else
 	    driver_output(port_num, (char*) read_buf, res);
 	erts_free(ERTS_ALC_T_SYS_READ_BUF, (void *) read_buf);
     }
-    else if (fd_data[ready_fd].remain > 0) { /* We try to read the remainder */
+    else if (dd->ifd->remain > 0) { /* We try to read the remainder */
 	/* space is allocated in buf */
-	res = read(ready_fd, fd_data[ready_fd].cpos, 
-		   fd_data[ready_fd].remain);
+	res = read(ready_fd, dd->ifd->cpos,
+		   dd->ifd->remain);
 	if (res < 0) {
 	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
-		port_inp_failure(port_num, ready_fd, res);
+		port_inp_failure(dd, res);
 	}
 	else if (res == 0) {
-	    port_inp_failure(port_num, ready_fd, res);
+	    port_inp_failure(dd, res);
 	}
-	else if (res == fd_data[ready_fd].remain) { /* we're done  */
-	    driver_output(port_num, fd_data[ready_fd].buf, 
-			  fd_data[ready_fd].sz);
-	    clear_fd_data(ready_fd);
+	else if (res == dd->ifd->remain) { /* we're done  */
+	    driver_output(port_num, dd->ifd->buf,
+			  dd->ifd->sz);
+	    clear_fd_data(dd->ifd);
 	}
-	else { /*  if (res < fd_data[ready_fd].remain) */
-	    fd_data[ready_fd].cpos += res;
-	    fd_data[ready_fd].remain -= res;
+	else { /*  if (res < dd->ifd->remain) */
+	    dd->ifd->cpos += res;
+	    dd->ifd->remain -= res;
 	}
     }
-    else if (fd_data[ready_fd].remain == 0) { /* clean fd */
+    else if (dd->ifd->remain == 0) { /* clean fd */
 	byte *read_buf = (byte *) erts_alloc(ERTS_ALC_T_SYS_READ_BUF,
 					     ERTS_SYS_READ_BUF_SZ);
 	/* We make one read attempt and see what happens */
 	res = read(ready_fd, read_buf, ERTS_SYS_READ_BUF_SZ);
-	if (res < 0) {  
+	if (res < 0) {
 	    if ((errno != EINTR) && (errno != ERRNO_BLOCK))
-		port_inp_failure(port_num, ready_fd, res);
+		port_inp_failure(dd, res);
 	}
 	else if (res == 0) {     	/* eof */
-	    port_inp_failure(port_num, ready_fd, res);
-	} 
-	else if (res < packet_bytes - fd_data[ready_fd].psz) { 
-	    memcpy(fd_data[ready_fd].pbuf+fd_data[ready_fd].psz,
+	    port_inp_failure(dd, res);
+	}
+	else if (res < packet_bytes - dd->ifd->psz) {
+	    memcpy(dd->ifd->pbuf+dd->ifd->psz,
 		   read_buf, res);
-	    fd_data[ready_fd].psz += res;
+	    dd->ifd->psz += res;
 	}
 	else  { /* if (res >= packet_bytes) */
 	    unsigned char* cpos = read_buf;
 	    int bytes_left = res;
 
 	    while (1) {
-		int psz = fd_data[ready_fd].psz;
-		char* pbp = fd_data[ready_fd].pbuf + psz;
+		int psz = dd->ifd->psz;
+		char* pbp = dd->ifd->pbuf + psz;
 
 		while(bytes_left && (psz < packet_bytes)) {
 		    *pbp++ = *cpos++;
 		    bytes_left--;
 		    psz++;
 		}
-		
+
 		if (psz < packet_bytes) {
-		    fd_data[ready_fd].psz = psz;
+		    dd->ifd->psz = psz;
 		    break;
 		}
-		fd_data[ready_fd].psz = 0;
+		dd->ifd->psz = 0;
 
 		switch (packet_bytes) {
-		case 1: h = get_int8(fd_data[ready_fd].pbuf);  break;
-		case 2: h = get_int16(fd_data[ready_fd].pbuf); break;
-		case 4: h = get_int32(fd_data[ready_fd].pbuf); break;
+		case 1: h = get_int8(dd->ifd->pbuf);  break;
+		case 2: h = get_int16(dd->ifd->pbuf); break;
+		case 4: h = get_int32(dd->ifd->pbuf); break;
 		default: ASSERT(0); return; /* -1; */
 		}
 
@@ -1664,15 +1479,15 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
 		        char *buf = erts_alloc_fnf(ERTS_ALC_T_FD_ENTRY_BUF, h);
 		    if (!buf) {
 			errno = ENOMEM;
-			port_inp_failure(port_num, ready_fd, -1);
+			port_inp_failure(dd, -1);
 		    }
 		    else {
 			erts_smp_atomic_add_nob(&sys_misc_mem_sz, h);
 			sys_memcpy(buf, cpos, bytes_left);
-			fd_data[ready_fd].buf = buf;
-			fd_data[ready_fd].sz = h;
-			fd_data[ready_fd].remain = h - bytes_left;
-			fd_data[ready_fd].cpos = buf + bytes_left;
+			dd->ifd->buf = buf;
+			dd->ifd->sz = h;
+			dd->ifd->remain = h - bytes_left;
+			dd->ifd->cpos = buf + bytes_left;
 		    }
 		    break;
 		}
@@ -1689,17 +1504,24 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
 
 static void ready_output(ErlDrvData e, ErlDrvEvent ready_fd)
 {
-    int fd = (int)(long)e;
-    ErlDrvPort ix = driver_data[fd].port_num;
+    ErtsSysDriverData *dd = (ErtsSysDriverData*)e;
+    ErlDrvPort ix = dd->port_num;
     int n;
     struct iovec* iv;
     int vsize;
-    
 
     if ((iv = (struct iovec*) driver_peekq(ix, &vsize)) == NULL) {
 	driver_select(ix, ready_fd, ERL_DRV_WRITE, 0);
-        if (driver_data[fd].terminating)
-            driver_failure_atom(driver_data[fd].port_num,"normal");
+        if (dd->pid > 0 && dd->ofd->fd < 0) {
+            /* The port was opened with 'in' option, which means we
+               should close the output fd as soon as the command has
+               been sent. */
+            driver_select(ix, ready_fd, ERL_DRV_WRITE|ERL_DRV_USE, 0);
+            erts_smp_atomic_add_nob(&sys_misc_mem_sz, -sizeof(ErtsSysFdData));
+            dd->ofd = NULL;
+        }
+        if (dd->terminating)
+            driver_failure_atom(dd->port_num,"normal");
 	return; /* 0; */
     }
     vsize = vsize > MAX_VSIZE ? MAX_VSIZE : vsize;
@@ -1731,7 +1553,7 @@ static void
 fd_async(void *async_data)
 {
     int res;
-    ErtsSysDriverData *dd = (ErtsSysDriverData*)async_data;
+    ErtsSysDriverData *dd = (ErtsSysDriverData *)async_data;
     SysIOVec      *iov0;
     SysIOVec      *iov;
     int            iovlen;
@@ -1751,7 +1573,7 @@ fd_async(void *async_data)
         driver_pdl_unlock(dd->blocking->pdl);
 
         do {
-            res = writev(dd->ofd, iov, iovlen);
+            res = writev(dd->ofd->fd, iov, iovlen);
         } while (res < 0 && errno == EINTR);
         if (res < 0)
             err = errno;
@@ -1769,7 +1591,6 @@ void fd_ready_async(ErlDrvData drv_data,
     ErlDrvPort port_num = dd->port_num;
 
     ASSERT(dd->blocking);
-    ASSERT(dd == (driver_data + (int)(long)drv_data));
 
     if (dd->blocking->res > 0) {
         driver_pdl_lock(dd->blocking->pdl);
@@ -1807,177 +1628,259 @@ void fd_ready_async(ErlDrvData drv_data,
 
 #endif
 
-static ERTS_INLINE void
-report_exit_status(ErtsSysReportExit *rep, int status)
+/* Forker driver */
+
+static int forker_fd;
+static Hash *forker_hash;
+static erts_smp_mtx_t forker_hash_mtx;
+
+static void ffree(void *e);
+
+static ErlDrvData forker_start(ErlDrvPort port_num, char* name,
+                               SysDriverOpts* opts)
 {
-    Port *pp;
-#ifdef ERTS_SMP
-    CHLD_STAT_UNLOCK;
-    pp = erts_thr_id2port_sflgs(rep->port,
-				ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP);
-    CHLD_STAT_LOCK;
-#else
-    pp = erts_id2port_sflgs(rep->port,
-			    NULL,
-			    0,
-			    ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP);
-#endif
-    if (pp) {
-	if (rep->ifd >= 0) {
-	    driver_data[rep->ifd].alive = 0;
-	    driver_data[rep->ifd].status = status;
-	    (void) driver_select(ERTS_Port2ErlDrvPort(pp),
-				 rep->ifd,
-				 (ERL_DRV_READ|ERL_DRV_USE),
-				 1);
-	}
-	if (rep->ofd >= 0) {
-	    driver_data[rep->ofd].alive = 0;
-	    driver_data[rep->ofd].status = status;
-	    (void) driver_select(ERTS_Port2ErlDrvPort(pp),
-				 rep->ofd,
-				 (ERL_DRV_WRITE|ERL_DRV_USE),
-				 1);
-	}
-#ifdef ERTS_SMP
-	erts_thr_port_release(pp);
-#else
-	erts_port_release(pp);
-#endif
+
+    int i;
+    int fds[2];
+    int res, unbind;
+    char bindir[MAXPATHLEN];
+    size_t bindirsz = sizeof(bindir);
+    Uint csp_path_sz;
+    char *child_setup_prog;
+
+    forker_port = erts_drvport2id(port_num);
+
+    res = erts_sys_getenv_raw("BINDIR", bindir, &bindirsz);
+    if (res != 0) {
+        if (res < 0)
+            erl_exit(-1,
+                     "Environment variable BINDIR is not set\n");
+        if (res > 0)
+            erl_exit(-1,
+                     "Value of environment variable BINDIR is too large\n");
+    }
+    if (bindir[0] != DIR_SEPARATOR_CHAR)
+        erl_exit(-1,
+                 "Environment variable BINDIR does not contain an"
+                 " absolute path\n");
+    csp_path_sz = (strlen(bindir)
+                   + 1 /* DIR_SEPARATOR_CHAR */
+                   + sizeof(CHILD_SETUP_PROG_NAME)
+                   + 1);
+    child_setup_prog = erts_alloc(ERTS_ALC_T_CS_PROG_PATH, csp_path_sz);
+    erts_snprintf(child_setup_prog, csp_path_sz,
+                  "%s%c%s",
+                  bindir,
+                  DIR_SEPARATOR_CHAR,
+                  CHILD_SETUP_PROG_NAME);
+    if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
+        erl_exit(ERTS_ABORT_EXIT,
+                 "Could not open unix domain socket in spawn_init: %d\n",
+                 errno);
     }
-    erts_free(ERTS_ALC_T_PRT_REP_EXIT, rep);
-}
 
-#if !CHLDWTHR  /* ---------------------------------------------------------- */
+    forker_fd = fds[0];
 
-#define ERTS_REPORT_EXIT_STATUS report_exit_status
+    unbind = erts_sched_bind_atfork_prepare();
 
-int check_children(void)
-{
-    int res = 0;
-    int pid;
-    int status;
+    i = fork();
 
-#ifndef ERTS_SMP
-    if (children_died)
-#endif
-    {
-	sys_sigblock(SIGCHLD);
-	CHLD_STAT_LOCK;
-	while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
-	    note_child_death(pid, status);
-#ifndef ERTS_SMP
-	children_died = 0;
+    if (i == 0) {
+        /* The child */
+        char *cs_argv[FORKER_ARGV_NO_OF_ARGS] =
+            {CHILD_SETUP_PROG_NAME, NULL, NULL};
+        char buff[128];
+
+        erts_sched_bind_atfork_child(unbind);
+
+        snprintf(buff, 128, "%d", sys_max_files());
+        cs_argv[FORKER_ARGV_MAX_FILES] = buff;
+
+        /* We preallocate fd 3 for the uds fd */
+        if (fds[1] != 3) {
+            dup2(fds[1], 3);
+        }
+
+#if defined(USE_SETPGRP_NOARGS)		/* SysV */
+    (void) setpgrp();
+#elif defined(USE_SETPGRP)		/* BSD */
+    (void) setpgrp(0, getpid());
+#else					/* POSIX */
+    (void) setsid();
 #endif
-	CHLD_STAT_UNLOCK;
-	sys_sigrelease(SIGCHLD);
-	res = 1;
+
+        execv(child_setup_prog, cs_argv);
+        _exit(1);
     }
-    return res;
-}
 
-#ifdef ERTS_SMP
+    erts_sched_bind_atfork_parent(unbind);
 
-void
-erts_check_children(void)
-{
-    (void) check_children();
-}
+    erts_free(ERTS_ALC_T_CS_PROG_PATH, child_setup_prog);
 
-#endif
+    close(fds[1]);
 
-#elif CHLDWTHR && defined(ERTS_SMP) /* ------------------------------------- */
+    SET_NONBLOCKING(forker_fd);
 
-#define ERTS_REPORT_EXIT_STATUS report_exit_status
+    driver_select(port_num, forker_fd, ERL_DRV_READ|ERL_DRV_USE, 1);
 
-int check_children(void)
+    return (ErlDrvData)port_num;
+}
+
+static void forker_stop(ErlDrvData e)
 {
-    return 0;
+    /* we probably should do something here */
 }
 
-#else /* CHLDWTHR && !defined(ERTS_SMP) ------------------------------------ */
+static void forker_ready_input(ErlDrvData e, ErlDrvEvent fd)
+{
+    int res, *exit_status;
+    char buff[8+10+1+10+1] = {0};
+    ErtsSysExitStatus est, *es;
+
+    if ((res = read(fd, buff, sizeof(buff))) < 0) {
+        if (errno == ERRNO_BLOCK)
+            return;
+        erl_exit(ERTS_DUMP_EXIT, "Failed to read from erl_child_setup: %d\n", errno);
+    }
+
+    if (res == 0)
+        erl_exit(ERTS_DUMP_EXIT, "erl_child_setup closed\n");
+
+    if (sscanf(buff, "SIGCHLD:%010d:%010d", &est.os_pid, &res) != 2)
+        erl_exit(ERTS_DUMP_EXIT, "Got corrupt data from erl_child_setup: %.s\n",
+                 buff, sizeof(buff));
+
+    erts_smp_mtx_lock(&forker_hash_mtx);
+    es = hash_remove(forker_hash, &est);
+    erts_smp_mtx_unlock(&forker_hash_mtx);
+
+    if (!es)
+        return;
 
-#define ERTS_REPORT_EXIT_STATUS initiate_report_exit_status
+    exit_status = erts_alloc(ERTS_ALC_T_DRV_CTRL_DATA, sizeof(int));
+    exit_status[0] = res;
+    /* ideally this would be a port_command call, but as command is
+       already used by the spawn_driver, we use control instead.
+       Note that when using erl_drv_port_control it is an asynchronous
+       control. */
+    erl_drv_port_control(es->port_id, 'S', (char*)exit_status, sizeof(int));
 
-static ERTS_INLINE void
-initiate_report_exit_status(ErtsSysReportExit *rep, int status)
+    ffree(es);
+
+}
+
+static void forker_ready_output(ErlDrvData e, ErlDrvEvent fd)
 {
-    rep->next = report_exit_transit_list;
-    rep->status = status;
-    report_exit_transit_list = rep;
-    erts_sys_schedule_interrupt(1);
+    ErlDrvPort port_num = (ErlDrvPort)e;
+
+    while(driver_sizeq(port_num) > 0) {
+        int vlen;
+        SysIOVec *iov = driver_peekq(port_num, &vlen);
+        int *fds = (int*)iov[0].iov_base;
+        ASSERT(iov[0].iov_len >= sizeof(int)*3);
+        if (sys_uds_write(forker_fd, "S", 1, fds, 3, 0) < 0) {
+            if (errno == ERRNO_BLOCK)
+                return;
+            erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
+        }
+        close(fds[0]);
+        close(fds[1]);
+        if (fds[1] != fds[2])
+            close(fds[2]);
+        driver_deq(port_num, sizeof(int)*3);
+    }
+
+    driver_select(port_num, forker_fd, ERL_DRV_WRITE, 0);
 }
 
-int check_children(void)
+static ErlDrvSSizeT forker_control(ErlDrvData e, unsigned int cmd, char *buf,
+                                   ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
 {
+    int *fds = (int*)buf;
+    ErlDrvPort port_num = (ErlDrvPort)e;
     int res;
-    ErtsSysReportExit *rep;
-    CHLD_STAT_LOCK;
-    rep = report_exit_transit_list;
-    res = rep != NULL;
-    while (rep) {
-	ErtsSysReportExit *curr_rep = rep;
-	rep = rep->next;
-	report_exit_status(curr_rep, curr_rep->status);
+
+    if (driver_sizeq(port_num) > 0) {
+        driver_enq(port_num, buf, len);
+        return 0;
     }
-    report_exit_transit_list = NULL;
-    CHLD_STAT_UNLOCK;
-    return res;
+
+    if ((res = sys_uds_write(forker_fd, "S", 1, fds, 3, 0)) < 0) {
+        if (errno == ERRNO_BLOCK) {
+            driver_enq(port_num, buf, len);
+            driver_select(port_num, forker_fd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
+            return 0;
+        }
+        erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
+    }
+    close(fds[0]);
+    close(fds[1]);
+    if (fds[1] != fds[2])
+        close(fds[2]);
+    return 0;
 }
 
-#endif /* ------------------------------------------------------------------ */
+static void forker_add_os_pid_mapping(ErtsSysDriverData *dd)
+{
+    Eterm port_id = erts_drvport2id(dd->port_num);
+    ErtsSysExitStatus es;
+    es.os_pid = dd->pid;
+    es.port_id = port_id;
+    erts_smp_mtx_lock(&forker_hash_mtx);
+    hash_put(forker_hash, &es);
+    erts_smp_mtx_unlock(&forker_hash_mtx);
+}
 
-static void note_child_death(int pid, int status)
+static void forker_remove_os_pid_mapping(ErtsSysDriverData *dd)
 {
-    ErtsSysReportExit **repp = &report_exit_list;
-    ErtsSysReportExit *rep = report_exit_list;
-
-    while (rep) {
-	if (pid == rep->pid) {
-	    *repp = rep->next;
-	    ERTS_REPORT_EXIT_STATUS(rep, status);
-	    break;
-	}
-	repp = &rep->next;
-	rep = rep->next;
-    }
+    ErtsSysExitStatus est, *es;
+    est.os_pid = dd->pid;
+    erts_smp_mtx_lock(&forker_hash_mtx);
+    es = hash_remove(forker_hash, &est);
+    erts_smp_mtx_unlock(&forker_hash_mtx);
+    if (es)
+        ffree(es);
 }
 
-#if CHLDWTHR
+static int fcmp(void *a, void *b)
+{
+    ErtsSysExitStatus *sa = a;
+    ErtsSysExitStatus *sb = b;
+    return !(sa->os_pid == sb->os_pid);
+}
 
-static void *
-child_waiter(void *unused)
+static HashValue fhash(void *e)
 {
-  int pid;
-  int status;
+    ErtsSysExitStatus *se = e;
+    return make_hash2(make_small(se->os_pid));
+}
 
-#ifdef ERTS_ENABLE_LOCK_CHECK
-  erts_lc_set_thread_name("child waiter");
-#endif
+static void *falloc(void *e)
+{
+    ErtsSysExitStatus *se = e;
+    ErtsSysExitStatus *ne = erts_alloc(ERTS_ALC_T_DRV, sizeof(ErtsSysExitStatus));
+    erts_smp_atomic_add_nob(&sys_misc_mem_sz, sizeof(ErtsSysBlocking));
+    ne->os_pid = se->os_pid;
+    ne->port_id = se->port_id;
+    return ne;
+}
 
-  while(1) {
-#ifdef DEBUG
-      int waitpid_errno;
-#endif
-      pid = waitpid(-1, &status, 0);
-#ifdef DEBUG
-      waitpid_errno = errno;
-#endif
-      CHLD_STAT_LOCK;
-      if (pid < 0) {
-	  ASSERT(waitpid_errno == ECHILD);
-      }
-      else {
-	  children_alive--;
-	  ASSERT(children_alive >= 0);
-	  note_child_death(pid, status);
-      }
-      while (!children_alive)
-	  CHLD_STAT_WAIT; /* Wait for children to wait on... :) */
-      CHLD_STAT_UNLOCK;
-  }
-
-  return NULL;
+static void ffree(void *e)
+{
+    erts_free(ERTS_ALC_T_DRV, e);
+    erts_smp_atomic_add_nob(&sys_misc_mem_sz, -sizeof(ErtsSysBlocking));
 }
 
-#endif
+static int forker_init(void)
+{
+    HashFunctions forker_hash_functions;
+    forker_hash_functions.hash = fhash;
+    forker_hash_functions.cmp = fcmp;
+    forker_hash_functions.alloc = falloc;
+    forker_hash_functions.free = ffree;
+    forker_hash = hash_new(ERTS_ALC_T_DRV, "forker_hash",
+                           16, forker_hash_functions);
+    erts_smp_mtx_init(&forker_hash_mtx, "forker_hash_mtx");
+
+    return 1;
+}
diff --git a/erts/emulator/sys/unix/sys_uds.c b/erts/emulator/sys/unix/sys_uds.c
new file mode 100644
index 0000000000..3b63d05cf6
--- /dev/null
+++ b/erts/emulator/sys/unix/sys_uds.c
@@ -0,0 +1,125 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2002-2009. All Rights Reserved.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+
+#include "sys_uds.h"
+
+int
+sys_uds_readv(int fd, struct iovec *iov, size_t iov_len,
+             int *fds, int fd_count, int flags) {
+    struct msghdr msg;
+    struct cmsghdr *cmsg = NULL;
+    char ancillary_buff[256] = {0};
+    int res, i = 0;
+
+    /* setup a place to fill in message contents */
+    memset(&msg, 0, sizeof(struct msghdr));
+    msg.msg_iov = iov;
+    msg.msg_iovlen = iov_len;
+
+    /* provide space for the ancillary data */
+    msg.msg_control = ancillary_buff;
+    msg.msg_controllen = sizeof(ancillary_buff);
+
+    if((res = recvmsg(fd, &msg, flags)) < 0) {
+        return res;
+    }
+
+    if((msg.msg_flags & MSG_CTRUNC) == MSG_CTRUNC)
+    {
+        /* We assume that we have given enough space for any header
+           that are sent to us. So the only remaining reason to get
+           this flag set is if the caller has run out of file descriptors.
+        */
+        errno = EMFILE;
+        return -1;
+    }
+
+    for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg) ) {
+        if ((cmsg->cmsg_level == SOL_SOCKET) &&
+            (cmsg->cmsg_type == SCM_RIGHTS)) {
+                int *cmsg_data = (int *)CMSG_DATA(cmsg);
+                while ((char*)cmsg_data < (char*)cmsg + cmsg->cmsg_len) {
+                    if (i < fd_count) {
+                        fds[i++] = *cmsg_data++;
+                    } else {
+                        /* for some strange reason, we have received more FD's
+                           than we wanted... close them if we are not running
+                           debug. */
+                        if(i >= fd_count) abort();
+                        close(*cmsg_data++);
+                    }
+                }
+            }
+    }
+
+    return res;
+}
+
+int
+sys_uds_read(int fd, char *buff, size_t len,
+             int *fds, int fd_count, int flags) {
+    struct iovec iov;
+    iov.iov_base = buff;
+    iov.iov_len = len;
+    return sys_uds_readv(fd, &iov, 1, fds, fd_count, flags);
+}
+
+
+int
+sys_uds_writev(int fd, struct iovec *iov, size_t iov_len,
+               int *fds, int fd_count, int flags) {
+
+    struct msghdr msg;
+    struct cmsghdr *cmsg = NULL;
+    int res;
+
+    /* initialize socket message */
+    memset(&msg, 0, sizeof(struct msghdr));
+    msg.msg_iov = iov;
+    msg.msg_iovlen = iov_len;
+
+    /* initialize the ancillary data */
+    msg.msg_control = calloc(1, CMSG_SPACE(sizeof(int) * fd_count));
+    msg.msg_controllen = CMSG_SPACE(sizeof(int) * fd_count);
+
+    /* copy the fd array into the ancillary data */
+    cmsg = CMSG_FIRSTHDR(&msg);
+    if(!cmsg) abort();
+    cmsg->cmsg_level = SOL_SOCKET;
+    cmsg->cmsg_type = SCM_RIGHTS;
+    cmsg->cmsg_len = CMSG_LEN(sizeof(int) * fd_count);
+    memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * fd_count);
+
+    res = sendmsg(fd, &msg, flags);
+
+    free(msg.msg_control);
+
+    return res;
+}
+
+int
+sys_uds_write(int fd, char *buff, size_t len,
+              int *fds, int fd_count, int flags) {
+    struct iovec iov;
+    iov.iov_base = buff;
+    iov.iov_len = len;
+    return sys_uds_writev(fd, &iov, 1, fds, fd_count, flags);
+}
diff --git a/erts/emulator/sys/unix/sys_uds.h b/erts/emulator/sys/unix/sys_uds.h
new file mode 100644
index 0000000000..7ff58b17dd
--- /dev/null
+++ b/erts/emulator/sys/unix/sys_uds.h
@@ -0,0 +1,47 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2002-2009. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+#ifndef _ERL_UNIX_UDS_H
+#define _ERL_UNIX_UDS_H
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#if defined(__sun__) && !defined(_XOPEN_SOURCE)
+#define _XOPEN_SOURCE 500
+#endif
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include "sys.h"
+
+int sys_uds_readv(int fd, struct iovec *iov, size_t iov_len,
+                  int *fds, int fd_count, int flags);
+int sys_uds_read(int fd, char *buff, size_t len,
+                 int *fds, int fd_count, int flags);
+int sys_uds_writev(int fd, struct iovec *iov, size_t iov_len,
+                   int *fds, int fd_count, int flags);
+int sys_uds_write(int fd, char *buff, size_t len,
+                  int *fds, int fd_count, int flags);
+
+#endif /* #ifndef _ERL_UNIX_UDS_H */
diff --git a/erts/emulator/sys/win32/sys.c b/erts/emulator/sys/win32/sys.c
index fce76db28f..3793357848 100644
--- a/erts/emulator/sys/win32/sys.c
+++ b/erts/emulator/sys/win32/sys.c
@@ -1334,10 +1334,8 @@ spawn_start(ErlDrvPort port_num, char* utf8_name, SysDriverOpts* opts)
 	retval = set_driver_data(dp, hFromChild, hToChild, opts->read_write,
 				 opts->exit_status);
 	if (retval != ERL_DRV_ERROR_GENERAL && retval != ERL_DRV_ERROR_ERRNO) {
-	    Port *prt = erts_drvport2port(port_num);
-		/* We assume that this cannot generate a negative number */
-	    ASSERT(prt != ERTS_INVALID_ERL_DRV_PORT);
-	    prt->os_pid = (SWord) pid;
+            /* We assume that this cannot generate a negative number */
+            erl_drv_set_os_pid(port_num, pid);
 	}
     }
     
@@ -3272,6 +3270,12 @@ void erl_sys_init(void)
 		 SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX); 
 }
 
+void
+erl_sys_late_init(void)
+{
+    /* do nothing */
+}
+
 void
 erts_sys_schedule_interrupt(int set)
 {
-- 
cgit v1.2.3


From d5f541904839b0307b1db3a28aace3ea6ba2fd37 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Tue, 11 Aug 2015 13:20:49 +0200
Subject: erts: Flatten too long io vectors in uds write

---
 erts/emulator/sys/unix/sys_uds.c | 30 ++++++++++++++++++++++++++----
 erts/emulator/sys/unix/sys_uds.h | 10 ++++++++++
 2 files changed, 36 insertions(+), 4 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/sys_uds.c b/erts/emulator/sys/unix/sys_uds.c
index 3b63d05cf6..daebcb307b 100644
--- a/erts/emulator/sys/unix/sys_uds.c
+++ b/erts/emulator/sys/unix/sys_uds.c
@@ -18,7 +18,6 @@
  * %CopyrightEnd%
  */
 
-
 #include "sys_uds.h"
 
 int
@@ -89,12 +88,32 @@ sys_uds_writev(int fd, struct iovec *iov, size_t iov_len,
 
     struct msghdr msg;
     struct cmsghdr *cmsg = NULL;
-    int res;
+    int res, i;
 
     /* initialize socket message */
     memset(&msg, 0, sizeof(struct msghdr));
-    msg.msg_iov = iov;
-    msg.msg_iovlen = iov_len;
+
+    /* We flatten the iov if it is too long */
+    if (iov_len > MAXIOV) {
+        int size = 0;
+        char *buff;
+        for (i = 0; i < iov_len; i++)
+            size += iov[i].iov_len;
+        buff = malloc(size);
+
+        for (i = 0; i < iov_len; i++) {
+            memcpy(buff, iov[i].iov_base, iov[i].iov_len);
+            buff += iov[i].iov_len;
+        }
+
+        iov[0].iov_base = buff - size;
+        iov[0].iov_len = size;
+        msg.msg_iov = iov;
+        msg.msg_iovlen = 1;
+    } else {
+        msg.msg_iov = iov;
+        msg.msg_iovlen = iov_len;
+    }
 
     /* initialize the ancillary data */
     msg.msg_control = calloc(1, CMSG_SPACE(sizeof(int) * fd_count));
@@ -110,6 +129,9 @@ sys_uds_writev(int fd, struct iovec *iov, size_t iov_len,
 
     res = sendmsg(fd, &msg, flags);
 
+    if (iov_len > MAXIOV)
+        free(iov[0].iov_base);
+
     free(msg.msg_control);
 
     return res;
diff --git a/erts/emulator/sys/unix/sys_uds.h b/erts/emulator/sys/unix/sys_uds.h
index 7ff58b17dd..844a2804d8 100644
--- a/erts/emulator/sys/unix/sys_uds.h
+++ b/erts/emulator/sys/unix/sys_uds.h
@@ -29,10 +29,20 @@
 #define _XOPEN_SOURCE 500
 #endif
 
+#include <limits.h>
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
 
+#if defined IOV_MAX
+#define MAXIOV IOV_MAX
+#elif defined UIO_MAXIOV
+#define MAXIOV UIO_MAXIOV
+#else
+#define MAXIOV 16
+#endif
+
 #include "sys.h"
 
 int sys_uds_readv(int fd, struct iovec *iov, size_t iov_len,
-- 
cgit v1.2.3


From 898ca7f86dff3fe21c9bf2e5018c7fb93dca158e Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Fri, 14 Aug 2015 11:51:21 +0200
Subject: erts: Fix dereferencing of unaligned integer for sparc

---
 erts/emulator/sys/unix/erl_child_setup.c | 12 ++++++------
 erts/emulator/sys/unix/sys_drivers.c     |  3 +++
 2 files changed, 9 insertions(+), 6 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 71c7948bf0..8bec36be60 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -133,8 +133,8 @@ start_new_child(int pipes[])
 
     o_buff = buff;
 
-    flags = *(int*)buff;
-    buff += sizeof(int);
+    flags = get_int32(buff);
+    buff += sizeof(Sint32);
 
     DEBUG_PRINT("flags = %d", flags);
 
@@ -150,8 +150,8 @@ start_new_child(int pipes[])
 
     DEBUG_PRINT("wd = %s", wd);
 
-    cnt = *(int*)buff;
-    buff += sizeof(int);
+    cnt = get_int32(buff);
+    buff += sizeof(Sint32);
     new_environ = malloc(sizeof(char*)*(cnt + 1));
 
     for (i = 0; i < cnt; i++, buff++) {
@@ -162,8 +162,8 @@ start_new_child(int pipes[])
 
     if (o_buff + size != buff) {
         /* This is a spawn executable call */
-        cnt = *(int*)buff;
-        buff += sizeof(int);
+        cnt = get_int32(buff);
+        buff += sizeof(Sint32);
         args = malloc(sizeof(char*)*(cnt + 1));
         for (i = 0; i < cnt; i++, buff++) {
             args[i] = buff;
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
index 8402197924..97a9c3dfaa 100644
--- a/erts/emulator/sys/unix/sys_drivers.c
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -699,6 +699,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
         io_vector[i++].iov_len = sizeof(buffsz);
 
         io_vector[i].iov_base = (void*)&flags;
+        flags = htonl(flags);
         io_vector[i++].iov_len = sizeof(flags);
         buffsz += sizeof(flags);
 
@@ -715,6 +716,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
         buffsz += io_vector[i-1].iov_len;
 
         io_vector[i].iov_base = (void*)&env_len;
+        env_len = htonl(env_len);
         io_vector[i++].iov_len = sizeof(env_len);
         buffsz += io_vector[i-1].iov_len;
 
@@ -728,6 +730,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
         if (opts->spawn_type == ERTS_SPAWN_EXECUTABLE) {
 
             io_vector[i].iov_base = (void*)&argv_len;
+            argv_len = htonl(argv_len);
             io_vector[i++].iov_len = sizeof(argv_len);
             buffsz += io_vector[i-1].iov_len;
 
-- 
cgit v1.2.3


From 9612b1fff77dc50e797f23b587321c90ceffe953 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Fri, 14 Aug 2015 19:45:44 +0200
Subject: erts: Fix uds socket handling for os x

OS X is very strict in what it requires of you and also
gives strange error codes for some errors. In this commit
we remap EMSGSIZE to EMFILE and also precisely tune the
amount of data we send on the socket so that we can recv
only that data. If we try to recv more, recvmsg fails with
EPIPE if the remote end has been closed.
---
 erts/emulator/sys/unix/sys_uds.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/sys_uds.c b/erts/emulator/sys/unix/sys_uds.c
index daebcb307b..015d0346a1 100644
--- a/erts/emulator/sys/unix/sys_uds.c
+++ b/erts/emulator/sys/unix/sys_uds.c
@@ -38,6 +38,14 @@ sys_uds_readv(int fd, struct iovec *iov, size_t iov_len,
     msg.msg_controllen = sizeof(ancillary_buff);
 
     if((res = recvmsg(fd, &msg, flags)) < 0) {
+#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
+        /* When some OS X versions run out of fd's
+           they give EMSGSIZE instead of EMFILE.
+           We remap this as we want the correct
+           error to appear for the user */
+        if (errno == EMSGSIZE)
+            errno = EMFILE;
+#endif
         return res;
     }
 
-- 
cgit v1.2.3


From 3599b995428032eb26e8b7cc6ac52bc5260ee454 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Thu, 27 Aug 2015 10:56:15 +0200
Subject: erts: Make child_setup work with large environments

---
 erts/emulator/sys/unix/erl_child_setup.c | 26 +++++++++----
 erts/emulator/sys/unix/sys_drivers.c     | 66 ++++++++++++++++++++------------
 2 files changed, 61 insertions(+), 31 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 8bec36be60..6e0a7c143f 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -109,7 +109,7 @@ static int sigchld_pipe[2];
 static int
 start_new_child(int pipes[])
 {
-    int size, res, i;
+    int size, res, i, pos = 0;
     char *buff, *o_buff;
 
     char *cmd, *wd, **new_environ, **args = NULL, cbuff[1];
@@ -126,10 +126,19 @@ start_new_child(int pipes[])
 
     DEBUG_PRINT("size = %d", size);
 
-    if ((res = read(pipes[0], buff, size)) != size) {
-        ABORT("Failed to read %d bytes from %d (%d,%d)",
-              size, pipes[0], res, errno);
-    }
+    do {
+        if ((res = read(pipes[0], buff + pos, size - pos)) < 0) {
+            if (errno == EAGAIN || errno == EINTR)
+                continue;
+            ABORT("Failed to read %d bytes from %d (%d,%d)",
+                  size, pipes[0], res, errno);
+        }
+        if (res == 0) {
+            errno = EPIPE;
+            goto child_error;
+        }
+        pos += res;
+    } while(size - pos != 0);
 
     o_buff = buff;
 
@@ -154,6 +163,7 @@ start_new_child(int pipes[])
     buff += sizeof(Sint32);
     new_environ = malloc(sizeof(char*)*(cnt + 1));
 
+    DEBUG_PRINT("env_len = %ld", cnt);
     for (i = 0; i < cnt; i++, buff++) {
         new_environ[i] = buff;
         while(*buff != '\0') buff++;
@@ -176,6 +186,7 @@ start_new_child(int pipes[])
         ABORT("Buff error: %p, %p:%p", o_buff, o_buff+size, buff);
     }
 
+    DEBUG_PRINT("read ack");
     if (read(pipes[0], cbuff, 1) < 1)
         goto child_error;
 
@@ -230,7 +241,8 @@ start_new_child(int pipes[])
         execle(SHELL, "sh", "-c", cmd, (char *) NULL, new_environ);
     }
 child_error:
-    _exit(1);
+    DEBUG_PRINT("exec error: %d\r\n",errno);
+    _exit(128 + errno);
 }
 
 
@@ -392,7 +404,7 @@ main(int argc, char *argv[])
             int ibuff[2];
             char buff[256];
             res = read(sigchld_pipe[0], ibuff, sizeof(ibuff));
-            if (res < 0) {
+            if (res <= 0) {
                 if (errno == EINTR)
                     continue;
                 ABORT("Failed to read from sigchld pipe: %d (%d)", res, errno);
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
index 97a9c3dfaa..6a1f2f6b2c 100644
--- a/erts/emulator/sys/unix/sys_drivers.c
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -558,7 +558,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
 
     int len;
     char **new_environ;
-    ErtsSysDriverData *res;
+    ErtsSysDriverData *dd;
     char *cmd_line;
     char wd_buff[MAXPATHLEN+1];
     char *wd;
@@ -658,10 +658,10 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
 
     {
         struct iovec *io_vector;
-        int buffsz = 0, iov_len = 5;
+        int iov_len = 5;
         char nullbuff[] = "\0";
-        int j, i = 0;
-        Sint32 env_len = 0, argv_len = 0,
+        int j, i = 0, res;
+        Sint32 buffsz = 0, env_len = 0, argv_len = 0,
             flags = (opts->use_stdio ? FORKER_FLAG_USE_STDIO : 0)
             | (opts->exit_status ? FORKER_FLAG_EXIT_STATUS : 0)
             | (opts->read_write & DO_READ ? FORKER_FLAG_DO_READ : 0)
@@ -753,16 +753,29 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
         }
 
         /* we send the request to do the fork */
-        if (writev(ofd[1], io_vector, iov_len) < 0) {
-            int err = errno;
-            close_pipes(ifd, ofd);
-            erts_free(ERTS_ALC_T_TMP, io_vector);
-            if (new_environ != environ)
-                erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
-            erts_smp_rwmtx_runlock(&environ_rwmtx);
-            erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
-            errno = err;
-            return ERL_DRV_ERROR_ERRNO;
+        if ((res = writev(ofd[1], io_vector, iov_len > MAXIOV ? MAXIOV : iov_len)) < 0) {
+            if (errno == ERRNO_BLOCK) {
+                res = 0;
+            } else {
+                int err = errno;
+                close_pipes(ifd, ofd);
+                erts_free(ERTS_ALC_T_TMP, io_vector);
+                if (new_environ != environ)
+                    erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
+                erts_smp_rwmtx_runlock(&environ_rwmtx);
+                erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+                errno = err;
+                return ERL_DRV_ERROR_ERRNO;
+            }
+        }
+
+        if (res < buffsz) {
+            /* we only wrote part of the command payload. Enqueue the rest. */
+            for (i = 0; i < iov_len; i++) {
+                driver_enq(port_num, io_vector[i].iov_base, io_vector[i].iov_len);
+            }
+            driver_deq(port_num, res);
+            driver_select(port_num, ofd[1], ERL_DRV_WRITE|ERL_DRV_USE, 1);
         }
 
         erts_free(ERTS_ALC_T_TMP, io_vector);
@@ -775,7 +788,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
 
     erts_smp_rwmtx_runlock(&environ_rwmtx);
 
-    res = create_driver_data(port_num, ifd[0], ofd[1], opts->packet_bytes,
+    dd = create_driver_data(port_num, ifd[0], ofd[1], opts->packet_bytes,
                              DO_WRITE | DO_READ, opts->exit_status,
                              0, 0);
 
@@ -797,12 +810,12 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
     /* we set these fds to negative to mark if
        they should be closed after the handshake */
     if (!(opts->read_write & DO_READ))
-        res->ifd->fd *= -1;
+        dd->ifd->fd *= -1;
 
     if (!(opts->read_write & DO_WRITE))
-        res->ofd->fd *= -1;
+        dd->ofd->fd *= -1;
 
-    return (ErlDrvData)res;
+    return (ErlDrvData)dd;
 #undef CMD_LINE_PREFIX_STR
 #undef CMD_LINE_PREFIX_STR_SZ
 }
@@ -1365,10 +1378,16 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
                 return;
             }
 
-            if (write(abs(dd->ofd->fd), "A", 1) < 0)
-                ; /* do nothing on failure here. If the ofd is broken, then
-                     the ifd will probably also be broken and trigger
-                     a port_inp_failure */
+            if (driver_sizeq(port_num) > 0) {
+                driver_enq(port_num, "A", 1);
+            } else {
+                if (write(abs(dd->ofd->fd), "A", 1) < 0)
+                    if (errno == ERRNO_BLOCK || errno == EINTR)
+                        driver_enq(port_num, "A", 1);
+                /* do nothing on failure here. If the ofd is broken, then
+                   the ifd will probably also be broken and trigger
+                   a port_inp_failure */
+            }
 
             if (dd->ifd->fd < 0) {
                 driver_select(port_num, abs(dd->ifd->fd), ERL_DRV_READ|ERL_DRV_USE, 0);
@@ -1381,9 +1400,8 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
                    child setup will close this fd if fd < 0 */
                 driver_select(port_num, abs(dd->ofd->fd), ERL_DRV_WRITE|ERL_DRV_USE, 1);
 
-            if (dd->alive == 1) {
+            if (dd->alive == 1)
                 forker_add_os_pid_mapping(dd);
-            }
 
             erl_drv_set_os_pid(port_num, dd->pid);
             erl_drv_init_ack(port_num, e);
-- 
cgit v1.2.3


From 123797a395b96b083d895c6ed7f41c56f4eafc78 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas.larsson@erlang-solutions.com>
Date: Mon, 14 Sep 2015 11:04:22 +0200
Subject: erts: Handle all EINTR and EAGAIN cases in child setup

---
 erts/emulator/sys/unix/erl_child_setup.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 6e0a7c143f..1f7ead0ec3 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -56,6 +56,8 @@
 #include <stdio.h>
 #include <sys/wait.h>
 
+#define WANT_NONBLOCKING
+
 #include "erl_driver.h"
 #include "sys_uds.h"
 
@@ -118,7 +120,11 @@ start_new_child(int pipes[])
 
     /* only child executes here */
 
-    if ((res = read(pipes[0], (char*)&size, sizeof(size))) < 0) {
+    do {
+        res = read(pipes[0], (char*)&size, sizeof(size));
+    } while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK));
+
+    if (res <= 0) {
         ABORT("Failed to read size from %d (%d)", pipes[0], errno);
     }
 
@@ -128,7 +134,7 @@ start_new_child(int pipes[])
 
     do {
         if ((res = read(pipes[0], buff + pos, size - pos)) < 0) {
-            if (errno == EAGAIN || errno == EINTR)
+            if (errno == ERRNO_BLOCK || errno == EINTR)
                 continue;
             ABORT("Failed to read %d bytes from %d (%d,%d)",
                   size, pipes[0], res, errno);
@@ -187,8 +193,13 @@ start_new_child(int pipes[])
     }
 
     DEBUG_PRINT("read ack");
-    if (read(pipes[0], cbuff, 1) < 1)
+    do {
+        res = read(pipes[0], cbuff, 1);
+    } while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK));
+    if (res < 1) {
+        errno = EPIPE;
         goto child_error;
+    }
 
     DEBUG_PRINT("Do that forking business: '%s'\n",cmd);
 
@@ -270,7 +281,10 @@ static void handle_sigchld(int sig) {
     sys_sigblock(SIGCHLD);
 
     while ((buff[0] = waitpid((pid_t)(-1), buff+1, WNOHANG)) > 0) {
-        if ((res = write(sigchld_pipe[1], buff, sizeof(buff))) <= 0)
+        do {
+            res = write(sigchld_pipe[1], buff, sizeof(buff));
+        } while (res < 0 && errno == EINTR);
+        if (res <= 0)
             ABORT("Failed to write to sigchld_pipe (%d): %d (%d)", sigchld_pipe[1], res, errno);
         DEBUG_PRINT("Reap child %d (%d)", buff[0], buff[1]);
     }
@@ -391,7 +405,7 @@ main(int argc, char *argv[])
             /* We write an ack here, but expect the reply on
                the pipes[0] inside the fork */
             res = sprintf(buff,"GO:%010d:%010d", os_pid, errno);
-            if (write(pipes[1], buff, res + 1))
+            while (write(pipes[1], buff, res + 1) < 0 && errno == EINTR)
                 ; /* remove gcc warning */
 
             sys_sigrelease(SIGCHLD);
-- 
cgit v1.2.3


From 0ad8c5f46bc0173c09fa5e7e91f917de82389068 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas.larsson@erlang-solutions.com>
Date: Fri, 11 Sep 2015 16:35:48 +0200
Subject: erts: Move os_pid to port hash to child setup

Had to move the hashing because of a race that can otherwise happen
where a new os_pid value was inserted into the hash before the
previous value had been removed.

Also replaced the protocol inbetween erts and child setup to be
a binary protocol. This was done in order to deal with the varying
size of Eterm.
---
 erts/emulator/sys/unix/erl_child_setup.c | 127 +++++++++++++++++--
 erts/emulator/sys/unix/erl_child_setup.h |  68 ++++++++++
 erts/emulator/sys/unix/erl_unix_sys.h    |   9 --
 erts/emulator/sys/unix/sys_drivers.c     | 211 ++++++++++---------------------
 4 files changed, 250 insertions(+), 165 deletions(-)
 create mode 100644 erts/emulator/sys/unix/erl_child_setup.h

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 1f7ead0ec3..f74cb0f356 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -60,6 +60,8 @@
 
 #include "erl_driver.h"
 #include "sys_uds.h"
+#include "hash.h"
+#include "erl_child_setup.h"
 
 #define SET_CLOEXEC(fd) fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC)
 
@@ -105,6 +107,10 @@ void sys_sigrelease(int sig)
     sigprocmask(SIG_UNBLOCK, &mask, (sigset_t *)NULL);
 }
 
+static void add_os_pid_to_port_id_mapping(Eterm, pid_t);
+static Eterm get_port_id(pid_t);
+static int forker_hash_init(void);
+
 static int max_files = -1;
 static int sigchld_pipe[2];
 
@@ -114,7 +120,7 @@ start_new_child(int pipes[])
     int size, res, i, pos = 0;
     char *buff, *o_buff;
 
-    char *cmd, *wd, **new_environ, **args = NULL, cbuff[1];
+    char *cmd, *wd, **new_environ, **args = NULL;
 
     Sint cnt, flags;
 
@@ -194,7 +200,12 @@ start_new_child(int pipes[])
 
     DEBUG_PRINT("read ack");
     do {
-        res = read(pipes[0], cbuff, 1);
+        ErtsSysForkerProto proto;
+        res = read(pipes[0], &proto, sizeof(proto));
+        if (res > 0) {
+            ASSERT(proto.action == ErtsSysForkerProtoAction_Ack);
+            ASSERT(res == sizeof(proto));
+        }
     } while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK));
     if (res < 1) {
         errno = EPIPE;
@@ -355,6 +366,8 @@ main(int argc, char *argv[])
         exit(1);
     }
 
+    forker_hash_init();
+
     SET_CLOEXEC(uds_fd);
 
     DEBUG_PRINT("Starting forker %d", max_files);
@@ -376,9 +389,10 @@ main(int argc, char *argv[])
 
         if (FD_ISSET(uds_fd, &read_fds)) {
             int pipes[3], res, os_pid;
-            char buff[256];
+            ErtsSysForkerProto proto;
             errno = 0;
-            if ((res = sys_uds_read(uds_fd, buff, 1, pipes, 3, MSG_DONTWAIT)) < 0) {
+            if ((res = sys_uds_read(uds_fd, (char*)&proto, sizeof(proto),
+                                    pipes, 3, MSG_DONTWAIT)) < 0) {
                 if (errno == EINTR)
                     continue;
                 DEBUG_PRINT("erl_child_setup failed to read from uds: %d, %d", res, errno);
@@ -391,8 +405,8 @@ main(int argc, char *argv[])
             }
             /* Since we use unix domain sockets and send the entire data in
                one go we *should* get the entire payload at once. */
-            ASSERT(res == 1);
-            ASSERT(buff[0] == 'S');
+            ASSERT(res == sizeof(proto));
+            ASSERT(proto.action == ErtsSysForkerProtoAction_Start);
 
             sys_sigblock(SIGCHLD);
 
@@ -402,10 +416,14 @@ main(int argc, char *argv[])
             if (os_pid == 0)
                 start_new_child(pipes);
 
+            add_os_pid_to_port_id_mapping(proto.u.start.port_id, os_pid);
+
             /* We write an ack here, but expect the reply on
                the pipes[0] inside the fork */
-            res = sprintf(buff,"GO:%010d:%010d", os_pid, errno);
-            while (write(pipes[1], buff, res + 1) < 0 && errno == EINTR)
+            proto.action = ErtsSysForkerProtoAction_Go;
+            proto.u.go.os_pid = os_pid;
+            proto.u.go.error_number = errno;
+            while (write(pipes[1], &proto, sizeof(proto)) < 0 && errno == EINTR)
                 ; /* remove gcc warning */
 
             sys_sigrelease(SIGCHLD);
@@ -416,16 +434,23 @@ main(int argc, char *argv[])
 
         if (FD_ISSET(sigchld_pipe[0], &read_fds)) {
             int ibuff[2];
-            char buff[256];
+            ErtsSysForkerProto proto;
             res = read(sigchld_pipe[0], ibuff, sizeof(ibuff));
             if (res <= 0) {
                 if (errno == EINTR)
                     continue;
                 ABORT("Failed to read from sigchld pipe: %d (%d)", res, errno);
             }
-            res = snprintf(buff, 256, "SIGCHLD:%010d:%010d", ibuff[0], ibuff[1]);
+
+            proto.u.sigchld.port_id = get_port_id((pid_t)(ibuff[0]));
+
+            if (proto.u.sigchld.port_id == THE_NON_VALUE)
+                continue; /* exit status report not requested */
+
+            proto.action = ErtsSysForkerProtoAction_SigChld;
+            proto.u.sigchld.error_number = ibuff[1];
             DEBUG_PRINT("send %s to %d", buff, uds_fd);
-            if (write(uds_fd, buff, res + 1) < 0) {
+            if (write(uds_fd, &proto, sizeof(proto)) < 0) {
                 if (errno == EINTR)
                     continue;
                 /* The uds was close, which most likely means that the VM
@@ -437,3 +462,83 @@ main(int argc, char *argv[])
     }
     return 1;
 }
+
+typedef struct exit_status {
+    HashBucket hb;
+    pid_t os_pid;
+    Eterm port_id;
+} ErtsSysExitStatus;
+
+static Hash *forker_hash;
+
+static void add_os_pid_to_port_id_mapping(Eterm port_id, pid_t os_pid)
+{
+    if (port_id != THE_NON_VALUE) {
+        /* exit status report requested */
+        ErtsSysExitStatus es;
+        es.os_pid = os_pid;
+        es.port_id = port_id;
+        hash_put(forker_hash, &es);
+    }
+}
+
+static Eterm get_port_id(pid_t os_pid)
+{
+    ErtsSysExitStatus est, *es;
+    Eterm port_id;
+    est.os_pid = os_pid;
+    es = hash_remove(forker_hash, &est);
+    if (!es) return THE_NON_VALUE;
+    port_id = es->port_id;
+    free(es);
+    return port_id;
+}
+
+static int fcmp(void *a, void *b)
+{
+    ErtsSysExitStatus *sa = a;
+    ErtsSysExitStatus *sb = b;
+    return !(sa->os_pid == sb->os_pid);
+}
+
+static HashValue fhash(void *e)
+{
+    ErtsSysExitStatus *se = e;
+    Uint32 val = se->os_pid;
+    val = (val+0x7ed55d16) + (val<<12);
+    val = (val^0xc761c23c) ^ (val>>19);
+    val = (val+0x165667b1) + (val<<5);
+    val = (val+0xd3a2646c) ^ (val<<9);
+    val = (val+0xfd7046c5) + (val<<3);
+    val = (val^0xb55a4f09) ^ (val>>16);
+    return val;
+}
+
+static void *falloc(void *e)
+{
+    ErtsSysExitStatus *se = e;
+    ErtsSysExitStatus *ne = malloc(sizeof(ErtsSysExitStatus));
+    ne->os_pid = se->os_pid;
+    ne->port_id = se->port_id;
+    return ne;
+}
+
+static void *meta_alloc(int type, size_t size) { return malloc(size); }
+static void meta_free(int type, void *p)       { free(p); }
+
+static int forker_hash_init(void)
+{
+    HashFunctions forker_hash_functions;
+    forker_hash_functions.hash = fhash;
+    forker_hash_functions.cmp = fcmp;
+    forker_hash_functions.alloc = falloc;
+    forker_hash_functions.free = free;
+    forker_hash_functions.meta_alloc = meta_alloc;
+    forker_hash_functions.meta_free  = meta_free;
+    forker_hash_functions.meta_print = NULL;
+
+    forker_hash = hash_new(0, "forker_hash",
+                           16, forker_hash_functions);
+
+    return 1;
+}
diff --git a/erts/emulator/sys/unix/erl_child_setup.h b/erts/emulator/sys/unix/erl_child_setup.h
new file mode 100644
index 0000000000..c3258f7cbe
--- /dev/null
+++ b/erts/emulator/sys/unix/erl_child_setup.h
@@ -0,0 +1,68 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2015-2015. All Rights Reserved.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * %CopyrightEnd%
+ *
+ * This file defines the interface inbetween erts and child_setup.
+ */
+
+#ifndef _ERL_UNIX_FORKER_H
+#define _ERL_UNIX_FORKER_H
+
+#include "sys.h"
+
+#define FORKER_ARGV_NO_OF_ARGS  3
+#define FORKER_ARGV_PROGNAME_IX	0    /* Program name                          */
+#define FORKER_ARGV_MAX_FILES	1    /* max_files                             */
+
+#define FORKER_FLAG_USE_STDIO   (1 << 0)    /* dup the pipe to stdin/stderr   */
+#define FORKER_FLAG_EXIT_STATUS (1 << 1)    /* send the exit status to parent */
+#define FORKER_FLAG_DO_READ     (1 << 2)    /* dup write fd */
+#define FORKER_FLAG_DO_WRITE    (1 << 3)    /* dup read  fd  */
+
+#if SIZEOF_VOID_P == SIZEOF_LONG
+typedef unsigned long ErtsSysPortId;
+#elif SIZEOF_VOID_P == SIZEOF_INT
+typedef unsigned int ErtsSysPortId;
+#elif SIZEOF_VOID_P == SIZEOF_LONG_LONG
+typedef unsigned long long ErtsSysPortId;
+#endif
+
+typedef struct ErtsSysForkerProto_ {
+    enum {
+        ErtsSysForkerProtoAction_Start,
+        ErtsSysForkerProtoAction_Go,
+        ErtsSysForkerProtoAction_SigChld,
+        ErtsSysForkerProtoAction_Ack
+    } action;
+    union {
+        struct {
+            ErtsSysPortId port_id;
+            int fds[3];
+        } start;
+        struct {
+            pid_t os_pid;
+            int error_number;
+        } go;
+        struct {
+            ErtsSysPortId port_id;
+            int error_number;
+        } sigchld;
+    } u;
+} ErtsSysForkerProto;
+
+#endif /* #ifndef _ERL_UNIX_FORKER_H */
diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index c46f2c1fa2..0352ee1b3c 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -410,15 +410,6 @@ void erts_sys_unblock_fpe(int);
 #define ERTS_FP_ERROR_THOROUGH(p, f, A)	__ERTS_FP_ERROR_THOROUGH(&(p)->fp_exception, f, A)
 
 
-#define FORKER_ARGV_NO_OF_ARGS  3
-#define FORKER_ARGV_PROGNAME_IX	0    /* Program name                          */
-#define FORKER_ARGV_MAX_FILES	1    /* max_files                             */
-
-#define FORKER_FLAG_USE_STDIO   (1 << 0)    /* dup the pipe to stdin/stderr   */
-#define FORKER_FLAG_EXIT_STATUS (1 << 1)    /* send the exit status to parent */
-#define FORKER_FLAG_DO_READ     (1 << 2)    /* dup write fd */
-#define FORKER_FLAG_DO_WRITE    (1 << 3)    /* dup read fd  */
-
 /* Threads */
 #ifdef USE_THREADS
 extern int init_async(int);
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
index 6a1f2f6b2c..82096e5779 100644
--- a/erts/emulator/sys/unix/sys_drivers.c
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -76,6 +76,8 @@ static Eterm forker_port;
 #include "erl_sys_driver.h"
 #include "sys_uds.h"
 
+#include "erl_child_setup.h"
+
 #if defined IOV_MAX
 #define MAXIOV IOV_MAX
 #elif defined UIO_MAXIOV
@@ -120,12 +122,6 @@ typedef struct driver_data {
     ErtsSysBlocking *blocking;
 } ErtsSysDriverData;
 
-typedef struct exit_status {
-    HashBucket hb;
-    pid_t os_pid;
-    Eterm port_id;
-} ErtsSysExitStatus;
-
 #define DIR_SEPARATOR_CHAR    '/'
 
 #if defined(__ANDROID__)
@@ -241,21 +237,18 @@ static void outputv(ErlDrvData, ErlIOVec*);
 static void stop_select(ErlDrvEvent, void*);
 
 /* II.V Forker prototypes */
-static int forker_init(void);
 static ErlDrvData forker_start(ErlDrvPort, char*, SysDriverOpts*);
 static void forker_stop(ErlDrvData);
 static void forker_ready_input(ErlDrvData, ErlDrvEvent);
 static void forker_ready_output(ErlDrvData, ErlDrvEvent);
 static ErlDrvSSizeT forker_control(ErlDrvData, unsigned int, char *,
                                    ErlDrvSizeT, char **, ErlDrvSizeT);
-static void forker_add_os_pid_mapping(ErtsSysDriverData *);
-static void forker_remove_os_pid_mapping(ErtsSysDriverData *);
 
 /* III Driver entries */
 
 /* III.I The spawn driver */
 struct erl_drv_entry spawn_driver_entry = {
-    forker_init,
+    NULL,
     spawn_start,
     stop,
     output,
@@ -794,12 +787,16 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
 
     {
         /* send ofd[0] + ifd[1] + stderrfd to forker port */
-        int *fds = erts_alloc(ERTS_ALC_T_DRV_CTRL_DATA, sizeof(int)*3);
-        memset(fds, 0, sizeof(int)*3);
-        fds[0] = ofd[0];
-        fds[1] = ifd[1];
-        fds[2] = stderrfd;
-        if (erl_drv_port_control(forker_port, 'S', (char*)fds, sizeof(int)*3)) {
+        ErtsSysForkerProto *proto =
+            erts_alloc(ERTS_ALC_T_DRV_CTRL_DATA,
+                       sizeof(ErtsSysForkerProto));
+        memset(proto, 0, sizeof(ErtsSysForkerProto));
+        proto->action = ErtsSysForkerProtoAction_Start;
+        proto->u.start.fds[0] = ofd[0];
+        proto->u.start.fds[1] = ifd[1];
+        proto->u.start.fds[2] = stderrfd;
+        proto->u.start.port_id = opts->exit_status ? erts_drvport2id(port_num) : THE_NON_VALUE;
+        if (erl_drv_port_control(forker_port, 'S', (char*)proto, sizeof(*proto))) {
             /* The forker port has been killed, we close both fd's which will
                make open_port throw an epipe error */
             close(ofd[0]);
@@ -824,8 +821,12 @@ static ErlDrvSSizeT spawn_control(ErlDrvData e, unsigned int cmd, char *buf,
                                   ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
 {
     ErtsSysDriverData *dd = (ErtsSysDriverData*)e;
+    ErtsSysForkerProto *proto = (ErtsSysForkerProto *)buf;
 
-    memcpy(&dd->status, buf, sizeof(dd->status));
+    ASSERT(len == sizeof(*proto));
+    ASSERT(proto->action == ErtsSysForkerProtoAction_SigChld);
+
+    dd->status = proto->u.sigchld.error_number;
     dd->alive = -1;
 
     if (dd->ifd)
@@ -1134,10 +1135,6 @@ static void stop(ErlDrvData ev)
     ErtsSysDriverData* dd = (ErtsSysDriverData*)ev;
     ErlDrvPort prt = dd->port_num;
 
-    if (dd->alive == 1)
-        /* Stop has been called before the exit status has been reported */
-        forker_remove_os_pid_mapping(dd);
-
     if (dd->ifd) {
         nbio_stop_fd(prt, dd->ifd);
         driver_select(prt, abs(dd->ifd->fd), ERL_DRV_USE, 0);  /* close(ifd); */
@@ -1354,10 +1351,10 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
 
     if (dd->pid == 0) {
         /* the pid is sent from erl_child_setup. spawn driver only. */
-        char message_buffer[3 + 10 + 1 + 10 + 1];
-        int reason, res;
+        ErtsSysForkerProto proto;
+        int res;
 
-        if((res = read(ready_fd, message_buffer, sizeof(message_buffer))) <= 0) {
+        if((res = read(ready_fd, &proto, sizeof(proto))) <= 0) {
             /* hmm, child setup seems to have closed the pipe too early...
                we close the port as there is not much else we can do */
             if (res < 0 && errno == ERRNO_BLOCK)
@@ -1369,21 +1366,25 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
             return;
         }
 
-        if(sscanf(message_buffer,"GO:%010d:%010d", &dd->pid, &reason) == 2) {
-            if (dd->pid == -1) {
-                /* Setup failed! The only reason why this should happen is if
-                   the fork fails. */
-                errno = reason;
-                port_inp_failure(dd, -1);
-                return;
-            }
+        ASSERT(proto.action == ErtsSysForkerProtoAction_Go);
+        dd->pid = proto.u.go.os_pid;
+
+        if (dd->pid == -1) {
+            /* Setup failed! The only reason why this should happen is if
+               the fork fails. */
+            errno = proto.u.go.error_number;
+            port_inp_failure(dd, -1);
+            return;
+        }
+
+        proto.action = ErtsSysForkerProtoAction_Ack;
 
-            if (driver_sizeq(port_num) > 0) {
-                driver_enq(port_num, "A", 1);
+        if (driver_sizeq(port_num) > 0) {
+            driver_enq(port_num, (char*)&proto, sizeof(proto));
             } else {
-                if (write(abs(dd->ofd->fd), "A", 1) < 0)
+                if (write(abs(dd->ofd->fd), &proto, sizeof(proto)) < 0)
                     if (errno == ERRNO_BLOCK || errno == EINTR)
-                        driver_enq(port_num, "A", 1);
+                        driver_enq(port_num, (char*)&proto, sizeof(proto));
                 /* do nothing on failure here. If the ofd is broken, then
                    the ifd will probably also be broken and trigger
                    a port_inp_failure */
@@ -1400,15 +1401,9 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
                    child setup will close this fd if fd < 0 */
                 driver_select(port_num, abs(dd->ofd->fd), ERL_DRV_WRITE|ERL_DRV_USE, 1);
 
-            if (dd->alive == 1)
-                forker_add_os_pid_mapping(dd);
-
             erl_drv_set_os_pid(port_num, dd->pid);
             erl_drv_init_ack(port_num, e);
             return;
-        }
-        ASSERT(0);
-        return;
     }
 
     if (packet_bytes == 0) {
@@ -1652,10 +1647,6 @@ void fd_ready_async(ErlDrvData drv_data,
 /* Forker driver */
 
 static int forker_fd;
-static Hash *forker_hash;
-static erts_smp_mtx_t forker_hash_mtx;
-
-static void ffree(void *e);
 
 static ErlDrvData forker_start(ErlDrvPort port_num, char* name,
                                SysDriverOpts* opts)
@@ -1749,16 +1740,18 @@ static ErlDrvData forker_start(ErlDrvPort port_num, char* name,
 
 static void forker_stop(ErlDrvData e)
 {
-    /* we probably should do something here */
+    /* we probably should do something here,
+       the port has been closed by the user. */
 }
 
 static void forker_ready_input(ErlDrvData e, ErlDrvEvent fd)
 {
-    int res, *exit_status;
-    char buff[8+10+1+10+1] = {0};
-    ErtsSysExitStatus est, *es;
+    int res;
+    ErtsSysForkerProto *proto;
+
+    proto = erts_alloc(ERTS_ALC_T_DRV_CTRL_DATA, sizeof(*proto));
 
-    if ((res = read(fd, buff, sizeof(buff))) < 0) {
+    if ((res = read(fd, proto, sizeof(*proto))) < 0) {
         if (errno == ERRNO_BLOCK)
             return;
         erl_exit(ERTS_DUMP_EXIT, "Failed to read from erl_child_setup: %d\n", errno);
@@ -1767,26 +1760,15 @@ static void forker_ready_input(ErlDrvData e, ErlDrvEvent fd)
     if (res == 0)
         erl_exit(ERTS_DUMP_EXIT, "erl_child_setup closed\n");
 
-    if (sscanf(buff, "SIGCHLD:%010d:%010d", &est.os_pid, &res) != 2)
-        erl_exit(ERTS_DUMP_EXIT, "Got corrupt data from erl_child_setup: %.s\n",
-                 buff, sizeof(buff));
-
-    erts_smp_mtx_lock(&forker_hash_mtx);
-    es = hash_remove(forker_hash, &est);
-    erts_smp_mtx_unlock(&forker_hash_mtx);
+    ASSERT(res == sizeof(*proto));
+    ASSERT(proto->action == ErtsSysForkerProtoAction_SigChld);
 
-    if (!es)
-        return;
-
-    exit_status = erts_alloc(ERTS_ALC_T_DRV_CTRL_DATA, sizeof(int));
-    exit_status[0] = res;
     /* ideally this would be a port_command call, but as command is
        already used by the spawn_driver, we use control instead.
        Note that when using erl_drv_port_control it is an asynchronous
        control. */
-    erl_drv_port_control(es->port_id, 'S', (char*)exit_status, sizeof(int));
-
-    ffree(es);
+    erl_drv_port_control(proto->u.sigchld.port_id, 'S',
+                         (char*)proto, sizeof(*proto));
 
 }
 
@@ -1797,18 +1779,19 @@ static void forker_ready_output(ErlDrvData e, ErlDrvEvent fd)
     while(driver_sizeq(port_num) > 0) {
         int vlen;
         SysIOVec *iov = driver_peekq(port_num, &vlen);
-        int *fds = (int*)iov[0].iov_base;
-        ASSERT(iov[0].iov_len >= sizeof(int)*3);
-        if (sys_uds_write(forker_fd, "S", 1, fds, 3, 0) < 0) {
+        ErtsSysForkerProto *proto = (ErtsSysForkerProto *)iov[0].iov_base;
+        ASSERT(iov[0].iov_len >= (sizeof(*proto)));
+        if (sys_uds_write(forker_fd, (char*)proto, sizeof(*proto),
+                          proto->u.start.fds, 3, 0) < 0) {
             if (errno == ERRNO_BLOCK)
                 return;
             erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
         }
-        close(fds[0]);
-        close(fds[1]);
-        if (fds[1] != fds[2])
-            close(fds[2]);
-        driver_deq(port_num, sizeof(int)*3);
+        close(proto->u.start.fds[0]);
+        close(proto->u.start.fds[1]);
+        if (proto->u.start.fds[1] != proto->u.start.fds[2])
+            close(proto->u.start.fds[2]);
+        driver_deq(port_num, sizeof(*proto));
     }
 
     driver_select(port_num, forker_fd, ERL_DRV_WRITE, 0);
@@ -1817,7 +1800,7 @@ static void forker_ready_output(ErlDrvData e, ErlDrvEvent fd)
 static ErlDrvSSizeT forker_control(ErlDrvData e, unsigned int cmd, char *buf,
                                    ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
 {
-    int *fds = (int*)buf;
+    ErtsSysForkerProto *proto = (ErtsSysForkerProto *)buf;
     ErlDrvPort port_num = (ErlDrvPort)e;
     int res;
 
@@ -1826,7 +1809,8 @@ static ErlDrvSSizeT forker_control(ErlDrvData e, unsigned int cmd, char *buf,
         return 0;
     }
 
-    if ((res = sys_uds_write(forker_fd, "S", 1, fds, 3, 0)) < 0) {
+    if ((res = sys_uds_write(forker_fd, (char*)proto, sizeof(*proto),
+                             proto->u.start.fds, 3, 0)) < 0) {
         if (errno == ERRNO_BLOCK) {
             driver_enq(port_num, buf, len);
             driver_select(port_num, forker_fd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
@@ -1834,74 +1818,11 @@ static ErlDrvSSizeT forker_control(ErlDrvData e, unsigned int cmd, char *buf,
         }
         erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
     }
-    close(fds[0]);
-    close(fds[1]);
-    if (fds[1] != fds[2])
-        close(fds[2]);
-    return 0;
-}
 
-static void forker_add_os_pid_mapping(ErtsSysDriverData *dd)
-{
-    Eterm port_id = erts_drvport2id(dd->port_num);
-    ErtsSysExitStatus es;
-    es.os_pid = dd->pid;
-    es.port_id = port_id;
-    erts_smp_mtx_lock(&forker_hash_mtx);
-    hash_put(forker_hash, &es);
-    erts_smp_mtx_unlock(&forker_hash_mtx);
-}
-
-static void forker_remove_os_pid_mapping(ErtsSysDriverData *dd)
-{
-    ErtsSysExitStatus est, *es;
-    est.os_pid = dd->pid;
-    erts_smp_mtx_lock(&forker_hash_mtx);
-    es = hash_remove(forker_hash, &est);
-    erts_smp_mtx_unlock(&forker_hash_mtx);
-    if (es)
-        ffree(es);
-}
-
-static int fcmp(void *a, void *b)
-{
-    ErtsSysExitStatus *sa = a;
-    ErtsSysExitStatus *sb = b;
-    return !(sa->os_pid == sb->os_pid);
-}
-
-static HashValue fhash(void *e)
-{
-    ErtsSysExitStatus *se = e;
-    return make_hash2(make_small(se->os_pid));
-}
-
-static void *falloc(void *e)
-{
-    ErtsSysExitStatus *se = e;
-    ErtsSysExitStatus *ne = erts_alloc(ERTS_ALC_T_DRV, sizeof(ErtsSysExitStatus));
-    erts_smp_atomic_add_nob(&sys_misc_mem_sz, sizeof(ErtsSysBlocking));
-    ne->os_pid = se->os_pid;
-    ne->port_id = se->port_id;
-    return ne;
-}
-
-static void ffree(void *e)
-{
-    erts_free(ERTS_ALC_T_DRV, e);
-    erts_smp_atomic_add_nob(&sys_misc_mem_sz, -sizeof(ErtsSysBlocking));
-}
-
-static int forker_init(void)
-{
-    HashFunctions forker_hash_functions;
-    forker_hash_functions.hash = fhash;
-    forker_hash_functions.cmp = fcmp;
-    forker_hash_functions.alloc = falloc;
-    forker_hash_functions.free = ffree;
-    forker_hash = hash_new(ERTS_ALC_T_DRV, "forker_hash",
-                           16, forker_hash_functions);
-    erts_smp_mtx_init(&forker_hash_mtx, "forker_hash_mtx");
-
-    return 1;
+    ASSERT(res == sizeof(*proto));
+    close(proto->u.start.fds[0]);
+    close(proto->u.start.fds[1]);
+    if (proto->u.start.fds[1] != proto->u.start.fds[2])
+        close(proto->u.start.fds[2]);
+    return 0;
 }
-- 
cgit v1.2.3


From 42b6156235421fbda1bc65c725e4ea7d183e4c84 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Mon, 12 Oct 2015 14:59:37 +0200
Subject: erts: Fix large open_port arg segfault for win32

os_SUITE:large_output_command send a 10k large
argument to open_port({spawn,""}) which was too
small for the 2K buffer allocated for win32.
The buffer is now dynamic and any size can be used.
---
 erts/emulator/sys/win32/sys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/win32/sys.c b/erts/emulator/sys/win32/sys.c
index 3793357848..76ce25916a 100644
--- a/erts/emulator/sys/win32/sys.c
+++ b/erts/emulator/sys/win32/sys.c
@@ -1526,8 +1526,8 @@ create_child_process
 	 * Parse out the program name from the command line (it can be quoted and
 	 * contain spaces).
 	 */
-	newcmdline = (wchar_t *) erts_alloc(ERTS_ALC_T_TMP, 2048*sizeof(wchar_t));
 	cmdlength = parse_command(origcmd);
+	newcmdline = (wchar_t *) erts_alloc(ERTS_ALC_T_TMP, (MAX_PATH+wcslen(origcmd)-cmdlength)*sizeof(wchar_t));
 	thecommand = (wchar_t *) erts_alloc(ERTS_ALC_T_TMP, (cmdlength+1)*sizeof(wchar_t));
 	wcsncpy(thecommand, origcmd, cmdlength);
 	thecommand[cmdlength] = L'\0';
-- 
cgit v1.2.3


From 598e7e6a456d882aaa586b5ddb17811ecd43f2e5 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Tue, 13 Oct 2015 16:55:50 +0200
Subject: erts: Add forker StartAck for port start flowcontrol

An acknowledgement of the Start command has to be managed
as we have to make sure that packages are not dropped and
also that the close calls do not happen too early.
---
 erts/emulator/sys/unix/erl_child_setup.c |  4 ++
 erts/emulator/sys/unix/erl_child_setup.h |  1 +
 erts/emulator/sys/unix/sys_drivers.c     | 76 +++++++++++++++++++-------------
 3 files changed, 51 insertions(+), 30 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index f74cb0f356..fdffc7f119 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -426,6 +426,10 @@ main(int argc, char *argv[])
             while (write(pipes[1], &proto, sizeof(proto)) < 0 && errno == EINTR)
                 ; /* remove gcc warning */
 
+            proto.action = ErtsSysForkerProtoAction_StartAck;
+            while (write(uds_fd, &proto, sizeof(proto)) < 0 && errno == EINTR)
+                ; /* remove gcc warning */
+
             sys_sigrelease(SIGCHLD);
             close(pipes[0]);
             close(pipes[1]);
diff --git a/erts/emulator/sys/unix/erl_child_setup.h b/erts/emulator/sys/unix/erl_child_setup.h
index c3258f7cbe..93b39d46b2 100644
--- a/erts/emulator/sys/unix/erl_child_setup.h
+++ b/erts/emulator/sys/unix/erl_child_setup.h
@@ -45,6 +45,7 @@ typedef unsigned long long ErtsSysPortId;
 typedef struct ErtsSysForkerProto_ {
     enum {
         ErtsSysForkerProtoAction_Start,
+        ErtsSysForkerProtoAction_StartAck,
         ErtsSysForkerProtoAction_Go,
         ErtsSysForkerProtoAction_SigChld,
         ErtsSysForkerProtoAction_Ack
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
index 82096e5779..dc1c00ff96 100644
--- a/erts/emulator/sys/unix/sys_drivers.c
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -1761,37 +1761,59 @@ static void forker_ready_input(ErlDrvData e, ErlDrvEvent fd)
         erl_exit(ERTS_DUMP_EXIT, "erl_child_setup closed\n");
 
     ASSERT(res == sizeof(*proto));
-    ASSERT(proto->action == ErtsSysForkerProtoAction_SigChld);
-
-    /* ideally this would be a port_command call, but as command is
-       already used by the spawn_driver, we use control instead.
-       Note that when using erl_drv_port_control it is an asynchronous
-       control. */
-    erl_drv_port_control(proto->u.sigchld.port_id, 'S',
-                         (char*)proto, sizeof(*proto));
-
-}
 
-static void forker_ready_output(ErlDrvData e, ErlDrvEvent fd)
-{
-    ErlDrvPort port_num = (ErlDrvPort)e;
-
-    while(driver_sizeq(port_num) > 0) {
+    if (proto->action == ErtsSysForkerProtoAction_StartAck) {
+        /* Ideally we would like to not have to ack each Start
+           command being sent over the uds, but it would seem
+           that some operating systems (only observed on FreeBSD)
+           throw away data on the uds when the socket becomes full,
+           so we have to.
+
+           Also the freebsd manual explicitly states that
+           you should not close fds before they are known
+           to have reached the other side, so this Ack protects
+           against that as well.
+        */
+        ErlDrvPort port_num = (ErlDrvPort)e;
         int vlen;
         SysIOVec *iov = driver_peekq(port_num, &vlen);
         ErtsSysForkerProto *proto = (ErtsSysForkerProto *)iov[0].iov_base;
-        ASSERT(iov[0].iov_len >= (sizeof(*proto)));
-        if (sys_uds_write(forker_fd, (char*)proto, sizeof(*proto),
-                          proto->u.start.fds, 3, 0) < 0) {
-            if (errno == ERRNO_BLOCK)
-                return;
-            erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
-        }
+
         close(proto->u.start.fds[0]);
         close(proto->u.start.fds[1]);
         if (proto->u.start.fds[1] != proto->u.start.fds[2])
             close(proto->u.start.fds[2]);
+
         driver_deq(port_num, sizeof(*proto));
+
+        if (driver_sizeq(port_num) > 0)
+            driver_select(port_num, forker_fd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
+    } else {
+        ASSERT(proto->action == ErtsSysForkerProtoAction_SigChld);
+
+        /* ideally this would be a port_command call, but as command is
+           already used by the spawn_driver, we use control instead.
+           Note that when using erl_drv_port_control it is an asynchronous
+           control. */
+        erl_drv_port_control(proto->u.sigchld.port_id, 'S',
+                             (char*)proto, sizeof(*proto));
+    }
+
+}
+
+static void forker_ready_output(ErlDrvData e, ErlDrvEvent fd)
+{
+    ErlDrvPort port_num = (ErlDrvPort)e;
+
+    int vlen;
+    SysIOVec *iov = driver_peekq(port_num, &vlen);
+    ErtsSysForkerProto *proto = (ErtsSysForkerProto *)iov[0].iov_base;
+    ASSERT(iov[0].iov_len >= (sizeof(*proto)));
+    if (sys_uds_write(forker_fd, (char*)proto, sizeof(*proto),
+                      proto->u.start.fds, 3, 0) < 0) {
+        if (errno == ERRNO_BLOCK)
+            return;
+        erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup uds: %d", errno);
     }
 
     driver_select(port_num, forker_fd, ERL_DRV_WRITE, 0);
@@ -1804,25 +1826,19 @@ static ErlDrvSSizeT forker_control(ErlDrvData e, unsigned int cmd, char *buf,
     ErlDrvPort port_num = (ErlDrvPort)e;
     int res;
 
-    if (driver_sizeq(port_num) > 0) {
-        driver_enq(port_num, buf, len);
+    driver_enq(port_num, buf, len);
+    if (driver_sizeq(port_num) > sizeof(*proto)) {
         return 0;
     }
 
     if ((res = sys_uds_write(forker_fd, (char*)proto, sizeof(*proto),
                              proto->u.start.fds, 3, 0)) < 0) {
         if (errno == ERRNO_BLOCK) {
-            driver_enq(port_num, buf, len);
             driver_select(port_num, forker_fd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
             return 0;
         }
         erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
     }
 
-    ASSERT(res == sizeof(*proto));
-    close(proto->u.start.fds[0]);
-    close(proto->u.start.fds[1]);
-    if (proto->u.start.fds[1] != proto->u.start.fds[2])
-        close(proto->u.start.fds[2]);
     return 0;
 }
-- 
cgit v1.2.3


From 6fc7ccb41da5e9ec4357b40811ad740dd6a3b5b2 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 14 Oct 2015 09:56:03 +0200
Subject: erts: Only use forker StackAck on freebsd

---
 erts/emulator/sys/unix/erl_child_setup.c |  2 ++
 erts/emulator/sys/unix/erl_child_setup.h |  8 ++++++
 erts/emulator/sys/unix/sys_drivers.c     | 48 ++++++++++++++++++++++----------
 3 files changed, 43 insertions(+), 15 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index fdffc7f119..998a0d297f 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -426,9 +426,11 @@ main(int argc, char *argv[])
             while (write(pipes[1], &proto, sizeof(proto)) < 0 && errno == EINTR)
                 ; /* remove gcc warning */
 
+#ifdef FORKER_PROTO_START_ACK
             proto.action = ErtsSysForkerProtoAction_StartAck;
             while (write(uds_fd, &proto, sizeof(proto)) < 0 && errno == EINTR)
                 ; /* remove gcc warning */
+#endif
 
             sys_sigrelease(SIGCHLD);
             close(pipes[0]);
diff --git a/erts/emulator/sys/unix/erl_child_setup.h b/erts/emulator/sys/unix/erl_child_setup.h
index 93b39d46b2..a28b136bfc 100644
--- a/erts/emulator/sys/unix/erl_child_setup.h
+++ b/erts/emulator/sys/unix/erl_child_setup.h
@@ -25,6 +25,14 @@
 
 #include "sys.h"
 
+#ifdef __FreeBSD__
+/* The freebsd sendmsg man page explicitly states that
+   you should not close fds before they are known
+   to have reached the other side, so this Ack protects
+   against that. */
+#define FORKER_PROTO_START_ACK 1
+#endif
+
 #define FORKER_ARGV_NO_OF_ARGS  3
 #define FORKER_ARGV_PROGNAME_IX	0    /* Program name                          */
 #define FORKER_ARGV_MAX_FILES	1    /* max_files                             */
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
index dc1c00ff96..2a7cd91265 100644
--- a/erts/emulator/sys/unix/sys_drivers.c
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -1762,17 +1762,13 @@ static void forker_ready_input(ErlDrvData e, ErlDrvEvent fd)
 
     ASSERT(res == sizeof(*proto));
 
+#ifdef FORKER_PROTO_START_ACK
     if (proto->action == ErtsSysForkerProtoAction_StartAck) {
         /* Ideally we would like to not have to ack each Start
            command being sent over the uds, but it would seem
            that some operating systems (only observed on FreeBSD)
            throw away data on the uds when the socket becomes full,
            so we have to.
-
-           Also the freebsd manual explicitly states that
-           you should not close fds before they are known
-           to have reached the other side, so this Ack protects
-           against that as well.
         */
         ErlDrvPort port_num = (ErlDrvPort)e;
         int vlen;
@@ -1788,7 +1784,9 @@ static void forker_ready_input(ErlDrvData e, ErlDrvEvent fd)
 
         if (driver_sizeq(port_num) > 0)
             driver_select(port_num, forker_fd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
-    } else {
+    } else
+#endif
+    {
         ASSERT(proto->action == ErtsSysForkerProtoAction_SigChld);
 
         /* ideally this would be a port_command call, but as command is
@@ -1805,16 +1803,27 @@ static void forker_ready_output(ErlDrvData e, ErlDrvEvent fd)
 {
     ErlDrvPort port_num = (ErlDrvPort)e;
 
-    int vlen;
-    SysIOVec *iov = driver_peekq(port_num, &vlen);
-    ErtsSysForkerProto *proto = (ErtsSysForkerProto *)iov[0].iov_base;
-    ASSERT(iov[0].iov_len >= (sizeof(*proto)));
-    if (sys_uds_write(forker_fd, (char*)proto, sizeof(*proto),
-                      proto->u.start.fds, 3, 0) < 0) {
-        if (errno == ERRNO_BLOCK)
-            return;
-        erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup uds: %d", errno);
+#ifndef FORKER_PROTO_START_ACK
+    while (driver_sizeq(port_num) > 0) {
+#endif
+        int vlen;
+        SysIOVec *iov = driver_peekq(port_num, &vlen);
+        ErtsSysForkerProto *proto = (ErtsSysForkerProto *)iov[0].iov_base;
+        ASSERT(iov[0].iov_len >= (sizeof(*proto)));
+        if (sys_uds_write(forker_fd, (char*)proto, sizeof(*proto),
+                          proto->u.start.fds, 3, 0) < 0) {
+            if (errno == ERRNO_BLOCK)
+                return;
+            erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
+        }
+#ifndef FORKER_PROTO_START_ACK
+        close(proto->u.start.fds[0]);
+        close(proto->u.start.fds[1]);
+        if (proto->u.start.fds[1] != proto->u.start.fds[2])
+            close(proto->u.start.fds[2]);
+        driver_deq(port_num, sizeof(*proto));
     }
+#endif
 
     driver_select(port_num, forker_fd, ERL_DRV_WRITE, 0);
 }
@@ -1840,5 +1849,14 @@ static ErlDrvSSizeT forker_control(ErlDrvData e, unsigned int cmd, char *buf,
         erl_exit(ERTS_DUMP_EXIT, "Failed to write to erl_child_setup: %d\n", errno);
     }
 
+#ifndef FORKER_PROTO_START_ACK
+    ASSERT(res == sizeof(*proto));
+    close(proto->u.start.fds[0]);
+    close(proto->u.start.fds[1]);
+    if (proto->u.start.fds[1] != proto->u.start.fds[2])
+        close(proto->u.start.fds[2]);
+    driver_deq(port_num, sizeof(*proto));
+#endif
+
     return 0;
 }
-- 
cgit v1.2.3


From 10ffa0b2f8c66b3a318503b4dfdfe02d6577d746 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Mon, 30 Nov 2015 12:00:44 +0100
Subject: erts: Mend ASSERT makro for erl_child_setup

when called by hash.c for example.

We use ASSERT from sys.h but erl_child_setup implements
its own erl_assert_error() as it doesn't link with sys.o.
---
 erts/emulator/sys/unix/erl_child_setup.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 998a0d297f..94d1fd64c7 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -83,11 +83,16 @@
         abort();                                                        \
     } while(0)
 
-#undef ASSERT
 #ifdef DEBUG
-#define ASSERT(cnd) do { if (!(cnd)) { ABORT("assertion %s failed", #cnd); } } while(0)
-#else
-#define ASSERT(cnd)
+void
+erl_assert_error(const char* expr, const char* func, const char* file, int line)
+{
+    fflush(stdout);
+    fprintf(stderr, "%s:%d:%s() Assertion failed: %s\n",
+            file, line, func, expr);
+    fflush(stderr);
+    abort();
+}
 #endif
 
 void sys_sigblock(int sig)
-- 
cgit v1.2.3


From 4b1b3bf6c62f8208b2eea506c9dac1504df6e916 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Tue, 8 Dec 2015 12:17:22 +0100
Subject: erts: Never abort in the forked child

We always want the error to propagate up to the application
when a child cannot be created.
---
 erts/emulator/sys/unix/erl_child_setup.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 94d1fd64c7..4e61530cf1 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -136,7 +136,7 @@ start_new_child(int pipes[])
     } while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK));
 
     if (res <= 0) {
-        ABORT("Failed to read size from %d (%d)", pipes[0], errno);
+        goto child_error;
     }
 
     buff = malloc(size);
@@ -147,8 +147,7 @@ start_new_child(int pipes[])
         if ((res = read(pipes[0], buff + pos, size - pos)) < 0) {
             if (errno == ERRNO_BLOCK || errno == EINTR)
                 continue;
-            ABORT("Failed to read %d bytes from %d (%d,%d)",
-                  size, pipes[0], res, errno);
+            goto child_error;
         }
         if (res == 0) {
             errno = EPIPE;
@@ -200,7 +199,8 @@ start_new_child(int pipes[])
     }
 
     if (o_buff + size != buff) {
-        ABORT("Buff error: %p, %p:%p", o_buff, o_buff+size, buff);
+        errno = EINVAL;
+        goto child_error;
     }
 
     DEBUG_PRINT("read ack");
-- 
cgit v1.2.3


From 3f33428db9aea0d767295322c4e882a5c6bbf7db Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Tue, 19 Jan 2016 17:05:55 +0100
Subject: Introduce time management in native APIs

---
 erts/emulator/sys/win32/erl_win_dyn_driver.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/win32/erl_win_dyn_driver.h b/erts/emulator/sys/win32/erl_win_dyn_driver.h
index baac7c903e..9c699fdba0 100644
--- a/erts/emulator/sys/win32/erl_win_dyn_driver.h
+++ b/erts/emulator/sys/win32/erl_win_dyn_driver.h
@@ -103,6 +103,11 @@ WDD_TYPEDEF(ErlDrvSInt, driver_pdl_inc_refc, (ErlDrvPDL));
 WDD_TYPEDEF(ErlDrvSInt, driver_pdl_dec_refc, (ErlDrvPDL));
 WDD_TYPEDEF(void, driver_system_info, (ErlDrvSysInfo *, size_t));
 WDD_TYPEDEF(int, driver_get_now, (ErlDrvNowData *));
+WDD_TYPEDEF(ErlDrvTime, erl_drv_monotonic_time, (ErlDrvTimeUnit));
+WDD_TYPEDEF(ErlDrvTime, erl_drv_time_offset, (ErlDrvTimeUnit));
+WDD_TYPEDEF(ErlDrvTime, erl_drv_convert_time_unit, (ErlDrvTime,
+						    ErlDrvTimeUnit,
+						    ErlDrvTimeUnit));
 WDD_TYPEDEF(int, driver_monitor_process, (ErlDrvPort port, 
 					  ErlDrvTermData process, 
 					  ErlDrvMonitor *monitor));
@@ -217,6 +222,9 @@ typedef struct {
     WDD_FTYPE(driver_pdl_dec_refc) *driver_pdl_dec_refc;
     WDD_FTYPE(driver_system_info) *driver_system_info;
     WDD_FTYPE(driver_get_now) *driver_get_now;
+    WDD_FTYPE(erl_drv_monotonic_time) *erl_drv_monotonic_time;
+    WDD_FTYPE(erl_drv_time_offset) *erl_drv_time_offset;
+    WDD_FTYPE(erl_drv_convert_time_unit) *erl_drv_convert_time_unit;
     WDD_FTYPE(driver_monitor_process) *driver_monitor_process;
     WDD_FTYPE(driver_demonitor_process) *driver_demonitor_process;
     WDD_FTYPE(driver_get_monitored_process) *driver_get_monitored_process;
@@ -328,6 +336,9 @@ extern TWinDynDriverCallbacks WinDynDriverCallbacks;
 #define driver_pdl_dec_refc (WinDynDriverCallbacks.driver_pdl_dec_refc)
 #define driver_system_info (WinDynDriverCallbacks.driver_system_info)
 #define driver_get_now (WinDynDriverCallbacks.driver_get_now)
+#define erl_drv_monotonic_time (WinDynDriverCallbacks.erl_drv_monotonic_time)
+#define erl_drv_time_offset (WinDynDriverCallbacks.erl_drv_time_offset)
+#define erl_drv_convert_time_unit (WinDynDriverCallbacks.erl_drv_convert_time_unit)
 #define driver_monitor_process \
 (WinDynDriverCallbacks.driver_monitor_process)
 #define driver_demonitor_process \
@@ -463,6 +474,9 @@ do {				                        \
 ((W).driver_pdl_dec_refc) = driver_pdl_dec_refc;	\
 ((W).driver_system_info) = driver_system_info;		\
 ((W).driver_get_now) = driver_get_now;		        \
+((W).erl_drv_monotonic_time) = erl_drv_monotonic_time;	\
+((W).erl_drv_time_offset) = erl_drv_time_offset;	\
+((W).erl_drv_convert_time_unit) = erl_drv_convert_time_unit; \
 ((W).driver_monitor_process) = driver_monitor_process;    \
 ((W).driver_demonitor_process) = driver_demonitor_process;  \
 ((W).driver_get_monitored_process) = driver_get_monitored_process;      \
-- 
cgit v1.2.3


From eea5f896780e07f7ca76685061d01e7be5a7abaa Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang-solutions.com>
Date: Thu, 11 Sep 2014 18:26:26 +0200
Subject: erts, kernel: Add os:perf_counter function

The perf_counter is a very very cheap and high resolution timer
that can be used to timestamp system events. It does not have
monoticity guarantees, but should on most OS's expose a monotonous
time.

A special instruction has been created for this counter to further
speed up fetching it.

OTP-12908
---
 erts/emulator/sys/unix/erl_unix_sys.h | 30 +++++++++++++++++++++++++++++-
 erts/emulator/sys/unix/sys_time.c     |  2 ++
 erts/emulator/sys/win32/erl_win_sys.h |  2 ++
 3 files changed, 33 insertions(+), 1 deletion(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index 0352ee1b3c..9f137048de 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -101,6 +101,10 @@
 #endif
 #include <netdb.h>
 
+#ifdef HAVE_MACH_ABSOLUTE_TIME
+#include <mach/mach_time.h>
+#endif
+
 #ifdef HAVE_POSIX_MEMALIGN
 #  define ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC 1
 #endif
@@ -266,7 +270,31 @@ erts_os_times(ErtsMonotonicTime *mtimep, ErtsSystemTime *stimep)
 #endif /* ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT */
 
 /*
- *
+ * Functions for getting the performance counter
+ */
+
+#if defined(__x86_64__)
+ /*  available on all x86_64. Best if used when we have constant_tsc and
+     nonstop_tsc cpu features. It may have been a good idea to put the
+     cpuid instruction before the rdtsc, but I decided against it
+     because it is not really needed for msacc, and it slows it down by
+     quite a bit. As a result though, this timestamp becomes much less
+     accurate as it might be re-ordered to be executed way before this
+     function is called.
+ */
+#define sys_perf_counter(ts) do {                                       \
+        __asm__ __volatile__ ("rdtsc\n\t"                               \
+                              "shl $32, %%rdx\n\t"                      \
+                              "or %%rdx, %0" : "=a" (*ts) : : "rdx");   \
+    } while(0)
+#define SYS_PERF_COUNTER_UNIT erts_perf_counter_unit()
+#else
+#define sys_perf_counter(ts) *(ts) = erts_get_perf_counter()
+#define SYS_PERF_COUNTER_UNIT 1000000000LL
+#endif
+
+/*
+ * Functions for measuring CPU time
  */
 
 #if (defined(HAVE_GETHRVTIME) || defined(HAVE_CLOCK_GETTIME_CPU_TIME))
diff --git a/erts/emulator/sys/unix/sys_time.c b/erts/emulator/sys/unix/sys_time.c
index 2e1914f564..6fc4fc7dc4 100644
--- a/erts/emulator/sys/unix/sys_time.c
+++ b/erts/emulator/sys/unix/sys_time.c
@@ -912,6 +912,8 @@ erts_os_times(ErtsMonotonicTime *mtimep, ErtsSystemTime *stimep)
 
 #ifdef HAVE_GETHRVTIME_PROCFS_IOCTL
 
+/* The code below only has effect on solaris < 10,
+   needed in order for gehhrvtime to work properly */
 int sys_start_hrvtime(void)
 {
     long msacct = PR_MSACCT;
diff --git a/erts/emulator/sys/win32/erl_win_sys.h b/erts/emulator/sys/win32/erl_win_sys.h
index 7e8dd8a4ca..1ab9eadefd 100644
--- a/erts/emulator/sys/win32/erl_win_sys.h
+++ b/erts/emulator/sys/win32/erl_win_sys.h
@@ -238,6 +238,8 @@ erts_sys_hrtime(void)
 
 extern void sys_gettimeofday(SysTimeval *tv);
 extern clock_t sys_times(SysTimes *buffer);
+#define sys_perf_counter(ts) *(ts) = erts_sys_hrtime()
+#define SYS_PERF_COUNTER_UNIT ERTS_I64_LITERAL(1000000000)
 
 extern char *win_build_environment(char *);
 
-- 
cgit v1.2.3


From 664ed2a6fd2b324bb6b56db3d3eca853cfda8f61 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang-solutions.com>
Date: Fri, 12 Sep 2014 16:38:00 +0200
Subject: erts: Add microstate accounting

Microstate accounting is a way to track which state the
different threads within ERTS are in. The main usage area
is to pin point performance bottlenecks by checking which
states the threads are in and then from there figuring out
why and where to optimize.

Since checking whether microstate accounting is on or off is
relatively expensive if done in a short loop only a few of the
states are enabled by default and more states can be enabled
through configure.

I've done some benchmarking and the overhead with it turned off
is not noticible and with it on it is a fraction of a percent.
If you enable the extra states, depending on the benchmark,
the ovehead when turned off is about 1% and when turned on
somewhere inbetween 5-15%.

OTP-12345
---
 erts/emulator/sys/common/erl_poll.c | 36 ++++++++++++++++++++++++++++--------
 erts/emulator/sys/win32/erl_poll.c  |  4 ++++
 2 files changed, 32 insertions(+), 8 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/common/erl_poll.c b/erts/emulator/sys/common/erl_poll.c
index 21fa214364..36ee94111c 100644
--- a/erts/emulator/sys/common/erl_poll.c
+++ b/erts/emulator/sys/common/erl_poll.c
@@ -74,6 +74,7 @@
 #include "erl_thr_progress.h"
 #include "erl_driver.h"
 #include "erl_alloc.h"
+#include "erl_msacc.h"
 
 #if !defined(ERTS_POLL_USE_EPOLL) \
     && !defined(ERTS_POLL_USE_DEVPOLL)  \
@@ -2238,6 +2239,7 @@ static ERTS_INLINE int
 check_fd_events(ErtsPollSet ps, ErtsMonotonicTime timeout_time, int max_res)
 {
     int res;
+    ERTS_MSACC_PUSH_STATE_M();
     if (erts_smp_atomic_read_nob(&ps->no_of_user_fds) == 0
 	&& timeout_time == ERTS_POLL_NO_TIMEOUT) {
 	/* Nothing to poll and zero timeout; done... */
@@ -2259,6 +2261,7 @@ check_fd_events(ErtsPollSet ps, ErtsMonotonicTime timeout_time, int max_res)
 #ifdef ERTS_SMP
                     erts_thr_progress_prepare_wait(NULL);
 #endif
+                    ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
                     timerfd_set(ps, &its);
                     res = epoll_wait(ps->kp_fd, ps->res_events, max_res, -1);
                     res = timerfd_clear(ps, res, max_res);
@@ -2268,10 +2271,12 @@ check_fd_events(ErtsPollSet ps, ErtsMonotonicTime timeout_time, int max_res)
             }
 #else /* !ERTS_POLL_USE_TIMERFD */
 	    timeout = (int) get_timeout(ps, 1000, timeout_time);
+            if (timeout) {
 #ifdef ERTS_SMP
-	    if (timeout)
 		erts_thr_progress_prepare_wait(NULL);
 #endif
+                ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
+            }
 	    res = epoll_wait(ps->kp_fd, ps->res_events, max_res, timeout);
 #endif /* !ERTS_POLL_USE_TIMERFD */
 #elif ERTS_POLL_USE_KQUEUE	/* --- kqueue ------------------------------ */
@@ -2279,10 +2284,12 @@ check_fd_events(ErtsPollSet ps, ErtsMonotonicTime timeout_time, int max_res)
 	    if (max_res > ps->res_events_len)
 		grow_res_events(ps, max_res);
 	    timeout = get_timeout_timespec(ps, &ts, timeout_time);
+            if (timeout) {
 #ifdef ERTS_SMP
-	    if (timeout)
 		erts_thr_progress_prepare_wait(NULL);
 #endif
+		ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
+            }
 	    res = kevent(ps->kp_fd, NULL, 0, ps->res_events, max_res, &ts);
 #endif				/* ----------------------------------------- */
 	}
@@ -2306,26 +2313,33 @@ check_fd_events(ErtsPollSet ps, ErtsMonotonicTime timeout_time, int max_res)
 	    if (poll_res.dp_nfds > ps->res_events_len)
 		grow_res_events(ps, poll_res.dp_nfds);
 	    poll_res.dp_fds = ps->res_events;
+	    if (timeout) {
 #ifdef ERTS_SMP
-	    if (timeout)
 		erts_thr_progress_prepare_wait(NULL);
 #endif
+                ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
+            }
 	    poll_res.dp_timeout = timeout;
 	    res = ioctl(ps->kp_fd, DP_POLL, &poll_res);
 #elif ERTS_POLL_USE_POLL && defined(HAVE_PPOLL)	/* --- ppoll ---------------- */
             struct timespec ts;
 	    timeout = get_timeout_timespec(ps, &ts, timeout_time);
+            if (timeout) {
 #ifdef ERTS_SMP
-	    if (timeout)
 		erts_thr_progress_prepare_wait(NULL);
 #endif
+		ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
+            }
             res = ppoll(ps->poll_fds, ps->no_poll_fds, &ts, NULL);
 #elif ERTS_POLL_USE_POLL        /* --- poll --------------------------------- */
 	    timeout = (int) get_timeout(ps, 1000, timeout_time);
+
+	    if (timeout) {
 #ifdef ERTS_SMP
-	    if (timeout)
 		erts_thr_progress_prepare_wait(NULL);
 #endif
+		ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
+            }
 	    res = poll(ps->poll_fds, ps->no_poll_fds, timeout);
 #elif ERTS_POLL_USE_SELECT	/* --- select ------------------------------ */
 	    SysTimeval to;
@@ -2334,18 +2348,22 @@ check_fd_events(ErtsPollSet ps, ErtsMonotonicTime timeout_time, int max_res)
 	    ERTS_FD_COPY(&ps->input_fds, &ps->res_input_fds);
 	    ERTS_FD_COPY(&ps->output_fds, &ps->res_output_fds);
 
+	    if (timeout) {
 #ifdef ERTS_SMP
-	    if (timeout)
 		erts_thr_progress_prepare_wait(NULL);
 #endif
+		ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
+	    }
 	    res = ERTS_SELECT(ps->max_fd + 1,
 			      &ps->res_input_fds,
 			      &ps->res_output_fds,
 			      NULL,
 			      &to);
 #ifdef ERTS_SMP
-	    if (timeout)
+	    if (timeout) {
 		erts_thr_progress_finalize_wait(NULL);
+		ERTS_MSACC_POP_STATE_M();
+	    }
 	    if (res < 0
 		&& errno == EBADF
 		&& ERTS_POLLSET_HAVE_UPDATE_REQUESTS(ps)) {
@@ -2380,10 +2398,12 @@ check_fd_events(ErtsPollSet ps, ErtsMonotonicTime timeout_time, int max_res)
 	    return res;
 #endif				/* ----------------------------------------- */
 	}
+	if (timeout) {
 #ifdef ERTS_SMP
-	if (timeout)
 	    erts_thr_progress_finalize_wait(NULL);
 #endif
+	    ERTS_MSACC_POP_STATE_M();
+	}
 	return res;
     }
 }
diff --git a/erts/emulator/sys/win32/erl_poll.c b/erts/emulator/sys/win32/erl_poll.c
index 466f4a3b48..660ded297a 100644
--- a/erts/emulator/sys/win32/erl_poll.c
+++ b/erts/emulator/sys/win32/erl_poll.c
@@ -27,6 +27,7 @@
 #include "erl_alloc.h"
 #include "erl_poll.h"
 #include "erl_time.h"
+#include "erl_msacc.h"
 
 /*
  * Some debug macros 
@@ -1188,16 +1189,19 @@ int erts_poll_wait(ErtsPollSet ps,
     if (timeout > 0 && !erts_atomic32_read_nob(&break_waiter_state)) {
 	HANDLE harr[2] = {ps->event_io_ready, break_happened_event};
 	int num_h = 2;
+        ERTS_MSACC_PUSH_STATE_M();
 
 	HARDDEBUGF(("Start waiting %d [%d]",num_h, (int) timeout));
 	ERTS_POLLSET_UNLOCK(ps);
 #ifdef ERTS_SMP
 	erts_thr_progress_prepare_wait(NULL);
 #endif
+        ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
 	WaitForMultipleObjects(num_h, harr, FALSE, timeout);
 #ifdef ERTS_SMP
 	erts_thr_progress_finalize_wait(NULL);
 #endif
+        ERTS_MSACC_POP_STATE_M();
 	ERTS_POLLSET_LOCK(ps);
 	HARDDEBUGF(("Stop waiting %d [%d]",num_h, (int) timeout));
 	woke_up(ps);
-- 
cgit v1.2.3


From 49458ee51bbbdcb06d776a846ce61a4eb274df04 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 15 Jul 2015 11:34:35 +0200
Subject: erts: use correct function for perf counter on non-x86

---
 erts/emulator/sys/unix/erl_unix_sys.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index 9f137048de..3a03d6be49 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -289,7 +289,7 @@ erts_os_times(ErtsMonotonicTime *mtimep, ErtsSystemTime *stimep)
     } while(0)
 #define SYS_PERF_COUNTER_UNIT erts_perf_counter_unit()
 #else
-#define sys_perf_counter(ts) *(ts) = erts_get_perf_counter()
+#define sys_perf_counter(ts) *(ts) = erts_sys_hrtime()
 #define SYS_PERF_COUNTER_UNIT 1000000000LL
 #endif
 
-- 
cgit v1.2.3


From 2181f97655906dac3b18333c149c384e1dc81c2b Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 15 Jul 2015 13:56:58 +0200
Subject: erts: Fix hrtime for windows

---
 erts/emulator/sys/win32/sys_time.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/win32/sys_time.c b/erts/emulator/sys/win32/sys_time.c
index 9e5f78703a..3b4fd26d63 100644
--- a/erts/emulator/sys/win32/sys_time.c
+++ b/erts/emulator/sys/win32/sys_time.c
@@ -397,6 +397,7 @@ sys_init_time(ErtsSysInitTimeResult *init_resp)
 
     erts_sys_time_data__.r.o.os_monotonic_time = os_mtime_func;
     erts_sys_time_data__.r.o.os_times = os_times_func;
+    erts_sys_time_data__.r.o.sys_hrtime = sys_hrtime_func;
     init_resp->os_monotonic_time_unit = time_unit;
     init_resp->have_os_monotonic_time = 1;
     init_resp->have_corrected_os_monotonic_time = 0;
-- 
cgit v1.2.3


From 0399f5fc547ef035c4eb5e383f30b28ae73d936e Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang-solutions.com>
Date: Thu, 16 Jul 2015 11:27:00 +0200
Subject: erts: Refactor perf counter internal interface

perf counter is now part of the function pointer interface
and also the function returns the value instead of writing
to a memory buffer.
---
 erts/emulator/sys/unix/erl_unix_sys.h |  35 +++++------
 erts/emulator/sys/unix/sys_time.c     | 112 ++++++++++++++++++++++++++++++++++
 erts/emulator/sys/win32/erl_win_sys.h |  16 ++++-
 3 files changed, 142 insertions(+), 21 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index 3a03d6be49..8b1822ca9f 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -161,6 +161,7 @@ typedef long long ErtsSysHrTime;
 #endif
 
 typedef ErtsMonotonicTime ErtsSystemTime;
+typedef ErtsSysHrTime ErtsSysPerfCounter;
 
 #define ERTS_MONOTONIC_TIME_MIN (((ErtsMonotonicTime) 1) << 63)
 #define ERTS_MONOTONIC_TIME_MAX (~ERTS_MONOTONIC_TIME_MIN)
@@ -209,6 +210,7 @@ ErtsSystemTime erts_os_system_time(void);
  * It may or may not be monotonic.
  */
 ErtsSysHrTime erts_sys_hrtime(void);
+#define ERTS_HRTIME_UNIT (1000*1000*1000)
 
 struct erts_sys_time_read_only_data__ {
 #ifdef ERTS_OS_MONOTONIC_INLINE_FUNC_PTR_CALL__
@@ -217,6 +219,8 @@ struct erts_sys_time_read_only_data__ {
 #ifdef ERTS_OS_TIMES_INLINE_FUNC_PTR_CALL__
     void (*os_times)(ErtsMonotonicTime *, ErtsSystemTime *);
 #endif
+    ErtsSysPerfCounter (*perf_counter)(void);
+    ErtsSysPerfCounter perf_counter_unit;
     int ticks_per_sec;
 };
 
@@ -273,25 +277,18 @@ erts_os_times(ErtsMonotonicTime *mtimep, ErtsSystemTime *stimep)
  * Functions for getting the performance counter
  */
 
-#if defined(__x86_64__)
- /*  available on all x86_64. Best if used when we have constant_tsc and
-     nonstop_tsc cpu features. It may have been a good idea to put the
-     cpuid instruction before the rdtsc, but I decided against it
-     because it is not really needed for msacc, and it slows it down by
-     quite a bit. As a result though, this timestamp becomes much less
-     accurate as it might be re-ordered to be executed way before this
-     function is called.
- */
-#define sys_perf_counter(ts) do {                                       \
-        __asm__ __volatile__ ("rdtsc\n\t"                               \
-                              "shl $32, %%rdx\n\t"                      \
-                              "or %%rdx, %0" : "=a" (*ts) : : "rdx");   \
-    } while(0)
-#define SYS_PERF_COUNTER_UNIT erts_perf_counter_unit()
-#else
-#define sys_perf_counter(ts) *(ts) = erts_sys_hrtime()
-#define SYS_PERF_COUNTER_UNIT 1000000000LL
-#endif
+ERTS_GLB_INLINE ErtsSysPerfCounter erts_sys_perf_counter(void);
+#define erts_sys_perf_counter_unit() erts_sys_time_data__.r.o.perf_counter_unit
+
+#if ERTS_GLB_INLINE_INCL_FUNC_DEF
+
+ERTS_GLB_INLINE ErtsSysPerfCounter
+erts_sys_perf_counter()
+{
+    return (*erts_sys_time_data__.r.o.perf_counter)();
+}
+
+#endif /* ERTS_GLB_INLINE_INCL_FUNC_DEF */
 
 /*
  * Functions for measuring CPU time
diff --git a/erts/emulator/sys/unix/sys_time.c b/erts/emulator/sys/unix/sys_time.c
index 6fc4fc7dc4..9738a8c352 100644
--- a/erts/emulator/sys/unix/sys_time.c
+++ b/erts/emulator/sys/unix/sys_time.c
@@ -65,6 +65,8 @@
 #  include <fcntl.h>
 #endif
 
+static void init_perf_counter(void);
+
 /******************* Routines for time measurement *********************/
 
 #undef ERTS_SYS_TIME_INTERNAL_STATE_WRITE_FREQ__
@@ -404,6 +406,8 @@ sys_init_time(ErtsSysInitTimeResult *init_resp)
 #  error Missing erts_os_system_time() implementation
 #endif
 
+    init_perf_counter();
+
 }
 
 void
@@ -908,6 +912,114 @@ erts_os_times(ErtsMonotonicTime *mtimep, ErtsSystemTime *stimep)
 
 #endif
 
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
+ * Performance counter functions                                             *
+\*                                                                           */
+
+
+/* What resolution to spin to in micro seconds */
+#define RESOLUTION 100
+/* How many iterations to spin */
+#define ITERATIONS 1
+/* How many significant figures to round to */
+#define SIGFIGS 3
+
+static ErtsSysPerfCounter calculate_perf_counter_unit(void) {
+    int i;
+    ErtsSysPerfCounter pre, post;
+    double value = 0;
+    double round_factor;
+#if defined(HAVE_GETHRTIME) && defined(GETHRTIME_WITH_CLOCK_GETTIME)
+    struct timespec basetime,comparetime;
+#define __GETTIME(arg) clock_gettime(CLOCK_MONOTONIC,arg)
+#define __GETUSEC(arg) (arg.tv_nsec / 1000)
+#else
+    SysTimeval basetime,comparetime;
+#define __GETTIME(arg) sys_gettimeofday(arg)
+#define __GETUSEC(arg) arg.tv_usec
+#endif
+
+    for (i = 0; i < ITERATIONS; i++) {
+        /* Make sure usec just flipped over at current resolution */
+        __GETTIME(&basetime);
+        do {
+            __GETTIME(&comparetime);
+        } while ((__GETUSEC(basetime) / RESOLUTION) == (__GETUSEC(comparetime) / RESOLUTION));
+
+        pre = erts_sys_perf_counter();
+
+        __GETTIME(&basetime);
+        do {
+            __GETTIME(&comparetime);
+        } while ((__GETUSEC(basetime) / RESOLUTION) == (__GETUSEC(comparetime) / RESOLUTION));
+
+        post = erts_sys_perf_counter();
+
+        value += post - pre;
+    }
+    /* After this value is ticks per us */
+    value /= (RESOLUTION*ITERATIONS);
+
+    /* We round to 3 significant figures */
+    round_factor = pow(10.0, SIGFIGS - ceil(log10(value)));
+    value = ((ErtsSysPerfCounter)(value * round_factor + 0.5)) / round_factor;
+
+    /* convert to ticks per second */
+    return 1000000 * value;
+}
+
+static int have_rdtscp(void)
+{
+#if defined(ETHR_X86_RUNTIME_CONF__)
+    /* On early x86 cpu's the tsc varies with
+       the current speed of the cpu, which means that the time per
+       tick vary depending on the current load of the cpu. We do not
+       want this as it would give very scewed numbers when the cpu is
+       mostly idle.
+       If we have the rdtscp feature it is a sign that the cpu is
+       relatively modern, and thus the tsc quite stable so we use it then.
+
+       If this test is not good enough, I don't know what we'll do.
+       Maybe fallback on erts_sys_hrtime always, but that would be a shame as
+       rdtsc is about 3 times faster than hrtime... */
+    return ETHR_X86_RUNTIME_CONF_HAVE_RDTSCP__;
+#else
+    return 0;
+#endif
+}
+
+static ErtsSysPerfCounter rdtsc(void)
+{
+ /*  It may have been a good idea to put the cpuid instruction before
+     the rdtsc, but I decided against it because it is not really
+     needed for msacc, and it slows it down by quite a bit (5-7 times slower).
+     As a result though, this timestamp becomes much less
+     accurate as it might be re-ordered to be executed way before or after this
+     function is called.
+ */
+    ErtsSysPerfCounter ts;
+#if defined(__x86_64__)
+    __asm__ __volatile__ ("rdtsc\n\t"
+                          "shl $32, %%rdx\n\t"
+                          "or %%rdx, %0" : "=a" (ts) : : "rdx");
+#elif defined(__i386__)
+    __asm__ __volatile__ ("rdtsc\n\t"
+                           : "=A" (ts) );
+#endif
+    return ts;
+}
+
+static void init_perf_counter(void)
+{
+    if (have_rdtscp()) {
+        erts_sys_time_data__.r.o.perf_counter = rdtsc;
+        erts_sys_time_data__.r.o.perf_counter_unit = calculate_perf_counter_unit();
+    } else {
+        erts_sys_time_data__.r.o.perf_counter = erts_sys_hrtime;
+        erts_sys_time_data__.r.o.perf_counter_unit = ERTS_HRTIME_UNIT;
+    }
+}
+
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #ifdef HAVE_GETHRVTIME_PROCFS_IOCTL
diff --git a/erts/emulator/sys/win32/erl_win_sys.h b/erts/emulator/sys/win32/erl_win_sys.h
index 1ab9eadefd..99c1066ab3 100644
--- a/erts/emulator/sys/win32/erl_win_sys.h
+++ b/erts/emulator/sys/win32/erl_win_sys.h
@@ -183,6 +183,7 @@ typedef LONGLONG ErtsSysHrTime;
 #endif
 
 typedef ErtsMonotonicTime ErtsSystemTime;
+typedef ErtsMonotonicTime ErtsSysPerfCounter;
 
 ErtsSystemTime erts_os_system_time(void);
 
@@ -213,6 +214,7 @@ ERTS_GLB_INLINE ErtsMonotonicTime erts_os_monotonic_time(void);
 ERTS_GLB_INLINE void erts_os_times(ErtsMonotonicTime *,
 				   ErtsSystemTime *);
 ERTS_GLB_INLINE ErtsSysHrTime erts_sys_hrtime(void);
+ERTS_GLB_INLINE ErtsSysPerfCounter erts_sys_perf_counter(void);
 
 #if ERTS_GLB_INLINE_INCL_FUNC_DEF
 
@@ -234,12 +236,22 @@ erts_sys_hrtime(void)
     return (*erts_sys_time_data__.r.o.sys_hrtime)();
 }
 
+ERTS_GLB_INLINE ErtsSysPerfCounter
+erts_sys_perf_counter(void)
+{
+    return (*erts_sys_time_data__.r.o.sys_hrtime)();
+}
+
+ERTS_GLB_INLINE ErtsSysPerfCounter
+erts_sys_perf_counter_unit(void)
+{
+    return 1000 * 1000 * 1000;
+}
+
 #endif /* ERTS_GLB_INLINE_INCL_FUNC_DEF */
 
 extern void sys_gettimeofday(SysTimeval *tv);
 extern clock_t sys_times(SysTimes *buffer);
-#define sys_perf_counter(ts) *(ts) = erts_sys_hrtime()
-#define SYS_PERF_COUNTER_UNIT ERTS_I64_LITERAL(1000000000)
 
 extern char *win_build_environment(char *);
 
-- 
cgit v1.2.3


From 6090f9c7e9b0ddbccef357641c1455475b348e94 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang-solutions.com>
Date: Thu, 16 Jul 2015 15:36:44 +0200
Subject: erts: Add power saving cpu feature tests and use them

---
 erts/emulator/sys/unix/sys_time.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

(limited to 'erts/emulator/sys')

diff --git a/erts/emulator/sys/unix/sys_time.c b/erts/emulator/sys/unix/sys_time.c
index 9738a8c352..03d39c7ce6 100644
--- a/erts/emulator/sys/unix/sys_time.c
+++ b/erts/emulator/sys/unix/sys_time.c
@@ -971,18 +971,18 @@ static ErtsSysPerfCounter calculate_perf_counter_unit(void) {
 static int have_rdtscp(void)
 {
 #if defined(ETHR_X86_RUNTIME_CONF__)
-    /* On early x86 cpu's the tsc varies with
-       the current speed of the cpu, which means that the time per
-       tick vary depending on the current load of the cpu. We do not
-       want this as it would give very scewed numbers when the cpu is
-       mostly idle.
-       If we have the rdtscp feature it is a sign that the cpu is
-       relatively modern, and thus the tsc quite stable so we use it then.
+    /* On early x86 cpu's the tsc varies with the current speed of the cpu,
+       which means that the time per tick vary depending on the current
+       load of the cpu. We do not want this as it would give very scewed
+       numbers when the cpu is mostly idle.
+       The linux kernel seems to think that checking for constant and
+       reliable is enough to trust the counter so we do the same.
 
        If this test is not good enough, I don't know what we'll do.
        Maybe fallback on erts_sys_hrtime always, but that would be a shame as
        rdtsc is about 3 times faster than hrtime... */
-    return ETHR_X86_RUNTIME_CONF_HAVE_RDTSCP__;
+    return ETHR_X86_RUNTIME_CONF_HAVE_CONSTANT_TSC__ &&
+        ETHR_X86_RUNTIME_CONF_HAVE_TSC_RELIABLE__;
 #else
     return 0;
 #endif
-- 
cgit v1.2.3