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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2024-03-12 10:18:32 +0200 |
|---|---|---|
| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2024-03-12 10:18:54 +0200 |
| commit | df27d76d32f2c1a2572983a5c6a874d003cd0321 (patch) | |
| tree | 16236f672169cb427a7f19173a974f5a05057ef6 | |
| parent | 80db5a3c9a579fd8d191fa2681179a02a09b0331 (diff) | |
| download | postgresql-df27d76d32f2c1a2572983a5c6a874d003cd0321.tar.gz postgresql-df27d76d32f2c1a2572983a5c6a874d003cd0321.zip | |
Disconnect if socket cannot be put into non-blocking mode
Commit 387da18874 moved the code to put socket into non-blocking mode
from socket_set_nonblocking() into the one-time initialization
function, pq_init(). In socket_set_nonblocking(), there indeed was a
risk of recursion on failure like the comment said, but in pq_init(),
ERROR or FATAL is fine. There's even another elog(FATAL) just after
this, if setting FD_CLOEXEC fails.
Note that COMMERROR merely logged the error, it did not close the
connection, so if putting the socket to non-blocking mode failed we
would use the connection anyway. You might not immediately notice,
because most socket operations in a regular backend wait for the
socket to become readable/writable anyway. But e.g. replication will
be quite broken.
Backpatch to all supported versions.
Discussion: https://www.postgresql.org/message-id/d40a5cd0-2722-40c5-8755-12e9e811fa3c@iki.fi
| -rw-r--r-- | src/backend/libpq/pqcomm.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c index 283a29caa63..7d465e05321 100644 --- a/src/backend/libpq/pqcomm.c +++ b/src/backend/libpq/pqcomm.c @@ -209,14 +209,10 @@ pq_init(void) * nonblocking mode and use latches to implement blocking semantics if * needed. That allows us to provide safely interruptible reads and * writes. - * - * Use COMMERROR on failure, because ERROR would try to send the error to - * the client, which might require changing the mode again, leading to - * infinite recursion. */ #ifndef WIN32 if (!pg_set_noblock(MyProcPort->sock)) - ereport(COMMERROR, + ereport(FATAL, (errmsg("could not set socket to nonblocking mode: %m"))); #endif |