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-rw-r--r--erts/doc/src/erlang.xml33
-rw-r--r--erts/emulator/beam/dist.c34
-rw-r--r--erts/emulator/beam/dist.h4
-rw-r--r--erts/emulator/beam/erl_binary.h7
-rw-r--r--erts/emulator/beam/external.c15
5 files changed, 60 insertions, 33 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index d205c24350..daf3002ec7 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -3361,25 +3361,6 @@ RealSystem = system + MissedSystem</code>
monitored process resides). </p></item>
</taglist>
- <p>If an attempt is made to monitor a process on an older node
- (where remote process monitoring is not implemented or
- where remote process monitoring by registered name is not
- implemented), the call fails with <c>badarg</c>.</p>
- <note>
- <p>The format of the <c>'DOWN'</c> message changed in ERTS
- 5.2 (Erlang/OTP R9B) for monitoring
- <em>by registered name</em>. Element <c>Object</c> of
- the <c>'DOWN'</c> message could in earlier versions
- sometimes be the process identifier of the monitored process and sometimes
- be the registered name. Now element <c>Object</c> is
- always a tuple consisting of the registered name and
- the node name. Processes on new nodes (ERTS 5.2
- or higher versions) always get <c>'DOWN'</c> messages on
- the new format even if they are monitoring processes on old
- nodes. Processes on old nodes always get <c>'DOWN'</c>
- messages on the old format.</p>
- </note>
-
<taglist>
<tag>Monitoring a <marker id="monitor_process"/><c>process</c></tag>
<item>
@@ -3387,7 +3368,19 @@ RealSystem = system + MissedSystem</code>
process identified by <c><anno>Item</anno></c>, which can be a
<c>pid()</c> (local or remote), an atom <c>RegisteredName</c> or
a tuple <c>{RegisteredName, Node}</c> for a registered process,
- located elsewhere.</p>
+ located elsewhere.</p>
+
+ <note><p>Before ERTS 10.0 (OTP 21.0), monitoring a process could fail with
+ <c>badarg</c> if the monitored process resided on a primitive node
+ (such as erl_interface or jinterface), where remote process monitoring
+ is not implemented.</p>
+ <p>Now, such a call to <c>monitor</c> will instead succeed and a
+ monitor is created. But the monitor will only supervise the
+ connection. That is, a <c>{'DOWN', _, process, _, noconnection}</c> is
+ the only message that may be received, as the primitive node have no
+ way of reporting the status of the monitored process.</p>
+ </note>
+
</item>
<tag>Monitoring a <marker id="monitor_port"/><c>port</c></tag>
diff --git a/erts/emulator/beam/dist.c b/erts/emulator/beam/dist.c
index 8593ad867a..7ff7462bf6 100644
--- a/erts/emulator/beam/dist.c
+++ b/erts/emulator/beam/dist.c
@@ -879,6 +879,13 @@ erts_dsig_send_m_exit(ErtsDSigData *dsdp, Eterm watcher, Eterm watched,
DeclareTmpHeapNoproc(ctl_heap,6);
int res;
+ if (~dsdp->dep->flags & (DFLAG_DIST_MONITOR | DFLAG_DIST_MONITOR_NAME)) {
+ /*
+ * Receiver does not support DOP_MONITOR_P_EXIT (see dsig_send_monitor)
+ */
+ return ERTS_DSIG_SEND_OK;
+ }
+
UseTmpHeapNoproc(6);
ctl = TUPLE5(&ctl_heap[0], make_small(DOP_MONITOR_P_EXIT),
@@ -906,6 +913,16 @@ erts_dsig_send_monitor(ErtsDSigData *dsdp, Eterm watcher, Eterm watched,
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
+ if (~dsdp->dep->flags & (DFLAG_DIST_MONITOR | DFLAG_DIST_MONITOR_NAME)) {
+ /*
+ * Receiver does not support DOP_MONITOR_P.
+ * Just avoid sending it and by doing that reduce this monitor
+ * to only supervise the connection. This will work for simple c-nodes
+ * with a 1-to-1 relation between "Erlang process" and OS-process.
+ */
+ return ERTS_DSIG_SEND_OK;
+ }
+
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_MONITOR_P),
@@ -928,6 +945,13 @@ erts_dsig_send_demonitor(ErtsDSigData *dsdp, Eterm watcher,
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
+ if (~dsdp->dep->flags & (DFLAG_DIST_MONITOR | DFLAG_DIST_MONITOR_NAME)) {
+ /*
+ * Receiver does not support DOP_DEMONITOR_P (see dsig_send_monitor)
+ */
+ return ERTS_DSIG_SEND_OK;
+ }
+
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_DEMONITOR_P),
@@ -2337,10 +2361,10 @@ erts_dist_command(Port *prt, int initial_reds)
ASSERT(ob);
do {
reds = erts_encode_ext_dist_header_finalize(ob, dep, flags, reds);
- if (reds >= 0) {
- last_finalized = ob;
- ob = ob->next;
- }
+ if (reds < 0)
+ break;
+ last_finalized = ob;
+ ob = ob->next;
} while (ob);
if (last_finalized) {
/*
@@ -2381,7 +2405,7 @@ erts_dist_command(Port *prt, int initial_reds)
break;
}
ASSERT(&oq.first->data[0] <= oq.first->extp
- && oq.first->extp < oq.first->ext_endp);
+ && oq.first->extp <= oq.first->ext_endp);
size = (*send)(prt, oq.first);
erts_atomic64_inc_nob(&dep->out);
esdp->io.out += (Uint64) size;
diff --git a/erts/emulator/beam/dist.h b/erts/emulator/beam/dist.h
index a96e39be89..ea4697815f 100644
--- a/erts/emulator/beam/dist.h
+++ b/erts/emulator/beam/dist.h
@@ -56,7 +56,9 @@
/* Additional optimistic flags when encoding toward pending connection */
#define DFLAG_DIST_HOPEFULLY (DFLAG_NO_MAGIC \
| DFLAG_EXPORT_PTR_TAG \
- | DFLAG_BIT_BINARIES)
+ | DFLAG_BIT_BINARIES \
+ | DFLAG_DIST_MONITOR \
+ | DFLAG_DIST_MONITOR_NAME)
/* All flags that should be enabled when term_to_binary/1 is used. */
#define TERM_TO_BINARY_DFLAGS (DFLAG_EXTENDED_REFERENCES \
diff --git a/erts/emulator/beam/erl_binary.h b/erts/emulator/beam/erl_binary.h
index 05007e864e..46653a8580 100644
--- a/erts/emulator/beam/erl_binary.h
+++ b/erts/emulator/beam/erl_binary.h
@@ -363,8 +363,6 @@ erts_free_aligned_binary_bytes(byte* buf)
# define CHICKEN_PAD (sizeof(void*) - 1)
#endif
-/* Caller must initialize 'refc'
-*/
ERTS_GLB_INLINE Binary *
erts_bin_drv_alloc_fnf(Uint size)
{
@@ -383,8 +381,6 @@ erts_bin_drv_alloc_fnf(Uint size)
return res;
}
-/* Caller must initialize 'refc'
-*/
ERTS_GLB_INLINE Binary *
erts_bin_drv_alloc(Uint size)
{
@@ -401,9 +397,6 @@ erts_bin_drv_alloc(Uint size)
return res;
}
-
-/* Caller must initialize 'refc'
-*/
ERTS_GLB_INLINE Binary *
erts_bin_nrml_alloc(Uint size)
{
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
index f2e6399ad7..9cc5e71afa 100644
--- a/erts/emulator/beam/external.c
+++ b/erts/emulator/beam/external.c
@@ -383,6 +383,21 @@ Sint erts_encode_ext_dist_header_finalize(ErtsDistOutputBuf* ob,
*/
ASSERT(ep[0] == SMALL_TUPLE_EXT || ep[0] == LARGE_TUPLE_EXT);
+ if (~dflags & (DFLAG_DIST_MONITOR | DFLAG_DIST_MONITOR_NAME)
+ && ep[0] == SMALL_TUPLE_EXT
+ && ep[1] == 4
+ && ep[2] == SMALL_INTEGER_EXT
+ && (ep[3] == DOP_MONITOR_P ||
+ ep[3] == DOP_MONITOR_P_EXIT ||
+ ep[3] == DOP_DEMONITOR_P)) {
+ /*
+ * Receiver does not support process monitoring.
+ * Suppress monitor control msg (see erts_dsig_send_monitor)
+ * by converting it to an empty (tick) packet.
+ */
+ ob->ext_endp = ob->extp;
+ return reds;
+ }
if (~dflags & (DFLAG_BIT_BINARIES | DFLAG_EXPORT_PTR_TAG
| DFLAG_DIST_HDR_ATOM_CACHE)) {
reds = transcode_dist_obuf(ob, dep, dflags, reds);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 03:50:25 +0000