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postgres_fdw: Fix bug in connection status check.

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The buildfarm member "hake" reported a failure in the regression test
added by commit 857df3cef7, where postgres_fdw_get_connections(true)
returned unexpected results.

The function postgres_fdw_get_connections(true) checks
if a connection is closed by using POLLRDHUP in the requested events
and calling poll(). Previously, the function only considered
POLLRDHUP or 0 as valid returned events. However, poll() can also
return POLLHUP, POLLERR, and/or POLLNVAL. So if any of these events
were returned, postgres_fdw_get_connections(true) would report
incorrect results. postgres_fdw_get_connections(true) failed to
account for these return events.

This commit updates postgres_fdw_get_connections(true) to correctly
report a closed connection when poll() returns not only POLLRDHUP
but also POLLHUP, POLLERR, or POLLNVAL.

Discussion: https://postgr.es/m/fd8f6186-9e1e-4b9a-92c5-e71e3697d381@oss.nttdata.com
This commit is contained in:
Fujii Masao 2024-07-27 03:05:47 +09:00
parent 4b56bb4ab4
commit 454aab4b73
1 changed files with 2 additions and 1 deletions
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3
contrib/postgres_fdw/connection.c
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@ -2309,7 +2309,8 @@ pgfdw_conn_check(PGconn *conn)
if (result < 0)
return -1;
return (input_fd.revents & POLLRDHUP) ? 1 : 0;
return (input_fd.revents &
(POLLRDHUP | POLLHUP | POLLERR | POLLNVAL)) ? 1 : 0;
}
#else
return 0;