Preliminary work on header/trailer

Have to figure out how to represent progress in header writing when
using non-blocking, not sure how to do this.

2 files changed, 68 insertions, 15 deletions

diff --git a/erts/emulator/drivers/common/efile_drv.c b/erts/emulator/drivers/common/efile_drv.c
index 1f13a65350..7eaafd5af1 100644
--- a/erts/emulator/drivers/common/efile_drv.c
+++ b/erts/emulator/drivers/common/efile_drv.c
@@ -358,15 +358,6 @@ struct t_readdir_buf {
      char buf[READDIR_BUFSIZE];
 };
 
-#ifdef HAVE_SENDFILE
-struct t_sendfile_hdtl {
-    int hdr_cnt; 	   /* number of header iovecs */
-    struct iovec *headers;  /* pointer to header iovecs */
-    int trl_cnt; 	   /* number of trailer iovecs */
-    struct iovec *trailers; /* pointer to trailer iovecs */
-};
-#endif /* HAVE_SENDFILE */
-
 struct t_data
 {
     struct t_data *next;
@@ -530,6 +521,8 @@ static void *ef_safe_realloc(void *op, Uint s)
         !0)                                               \
      : 0)
 
+/* int EV_GET_SYSIOVEC(ErlIoVec *ev, Uint32, int *cnt, SysIOVec **target, int *pp, int *qp) */
+#define EV_GET_SYSIOVEC ev_get_sysiovec
 
 
 #if 0
@@ -943,6 +936,41 @@ static int reply_eof(file_descriptor *desc) {
     return 0;
 }
 
+static int ev_get_sysiovec(ErlIOVec *ev, Uint32 len, int *cnt, SysIOVec **target, int *pp, int *qp) {
+    int tmp_p = *pp, tmp_q = *qp, tmp_len = len, i;
+    SysIOVec *tmp_target;
+    while (tmp_len != 0) {
+	if (tmp_len + tmp_p > ev->iov[tmp_q].iov_len) {
+
+	    tmp_len -= ev->iov[tmp_q].iov_len - tmp_p;
+	    tmp_q++;
+	    tmp_p = 0;
+	    if (tmp_q == ev->vsize)
+		return 0;
+	} else break;
+    }
+    *cnt = tmp_q - *qp + 1;
+    tmp_target = EF_SAFE_ALLOC(sizeof(SysIOVec)* (*cnt));
+    *target = tmp_target;
+    for (i = 0; i < *cnt; i++) {
+	tmp_target[i].iov_base = ev->iov[*qp].iov_base+*pp;
+	if (len + *pp <= ev->iov[*qp].iov_len) {
+	    tmp_target[i].iov_len = len;
+	    if (len + *pp == ev->iov[*qp].iov_len) {
+	      *pp = 0;
+	      (*qp)++;
+	    } else
+	      *pp += len;
+	} else {
+	    tmp_target[i].iov_len = ev->iov[*qp].iov_len - *pp;
+	    len -= ev->iov[*qp].iov_len - *pp;
+	    *pp = 0;
+	    (*qp)++;
+	}
+    }
+    return 1;
+}
+
 
  
 static void invoke_name(void *data, int (*f)(Efile_error *, char *))
@@ -1753,7 +1781,7 @@ static void invoke_sendfile(void *data)
     int result = 0;
     d->again = 0;
 
-    result = efile_sendfile(&d->errInfo, fd, out_fd, &d->c.sendfile.offset, &nbytes);
+    result = efile_sendfile(&d->errInfo, fd, out_fd, &d->c.sendfile.offset, &nbytes, &d->c.sendfile.hdtl);
 
     d->c.sendfile.written += nbytes;
 
@@ -3394,7 +3422,7 @@ file_outputv(ErlDrvData e, ErlIOVec *ev) {
 
 #ifdef HAVE_SENDFILE
         struct t_data *d;
-	Uint32 out_fd, offsetH, offsetL;
+	Uint32 out_fd, offsetH, offsetL, hd_len, tl_len;
 	Uint64 nbytes;
 	char flags;
 
@@ -3410,7 +3438,9 @@ file_outputv(ErlDrvData e, ErlIOVec *ev) {
 		|| !EV_GET_CHAR(ev, &flags, &p, &q)
 		|| !EV_GET_UINT32(ev, &offsetH, &p, &q)
 		|| !EV_GET_UINT32(ev, &offsetL, &p, &q)
-		|| !EV_GET_UINT64(ev, &nbytes, &p, &q)) {
+		|| !EV_GET_UINT64(ev, &nbytes, &p, &q)
+		|| !EV_GET_UINT32(ev, &hd_len, &p, &q)
+		|| !EV_GET_UINT32(ev, &tl_len, &p, &q)) {
 	    /* Buffer has wrong length to contain all the needed values */
 	    reply_posix_error(desc, EINVAL);
 	    goto done;
@@ -3438,8 +3468,18 @@ file_outputv(ErlDrvData e, ErlIOVec *ev) {
     #endif
 
 	d->c.sendfile.nbytes = nbytes;
-
-	/* Do HEADER TRAILER stuff by calculating pointer places, not by copying data! */
+	if (hd_len == 0 && tl_len == 0)
+	    d->c.sendfile.hdtl = NULL;
+	else {
+	    d->c.sendfile.hdtl = EF_SAFE_ALLOC(sizeof(struct t_sendfile_hdtl));
+	    if (!EV_GET_SYSIOVEC(ev, hd_len, &d->c.sendfile.hdtl->hdr_cnt, &d->c.sendfile.hdtl->headers, &p, &q)
+		    || !EV_GET_SYSIOVEC(ev, tl_len, &d->c.sendfile.hdtl->trl_cnt, &d->c.sendfile.hdtl->trailers, &p, &q)) {
+		EF_FREE(d->c.sendfile.hdtl);
+		EF_FREE(d);
+		reply_posix_error(desc, EINVAL);
+		goto done;
+	    }
+	}
 
 	if (sys_info.async_threads != 0) {
 	    SET_BLOCKING(d->c.sendfile.out_fd);
diff --git a/erts/emulator/drivers/common/erl_efile.h b/erts/emulator/drivers/common/erl_efile.h
index fd6dc94755..b73fb35120 100644
--- a/erts/emulator/drivers/common/erl_efile.h
+++ b/erts/emulator/drivers/common/erl_efile.h
@@ -118,6 +118,19 @@ typedef struct _Efile_info {
 				 */
 } Efile_info;
 
+
+#ifdef HAVE_SENDFILE
+/*
+ * Described the structure of header/trailers for sendfile
+ */
+struct t_sendfile_hdtl {
+    SysIOVec *headers;
+    int hdr_cnt;
+    SysIOVec *trailers;
+    int trl_cnt;
+};
+#endif /* HAVE_SENDFILE */
+
 /*
  * Functions.
  */
@@ -164,5 +177,5 @@ int efile_fadvise(Efile_error* errInfo, int fd, Sint64 offset, Sint64 length,
 		  int advise);
 #ifdef HAVE_SENDFILE
 int efile_sendfile(Efile_error* errInfo, int in_fd, int out_fd,
-		      off_t *offset, Uint64 *nbytes);
+		      off_t *offset, Uint64 *nbytes, struct t_sendfile_hdtl **hdtl);
 #endif /* HAVE_SENDFILE */