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Distinguish between AcquireExternalFD and epoll_create1 / kqueue failing

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The error messages in CreateWaitEventSet() made it hard to know whether the
syscall or AcquireExternalFD() failed. This is particularly relevant because
AcquireExternalFD() imposes a lower limit than what would cause syscalls fail
with EMFILE.

I did not change the message in libpqsrv_connect_prepare(), which is the one
other use of AcquireExternalFD() in our codebase, as the error message already
is less ambiguous.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/xjjx7r4xa7beixuu4qtkdhnwdbchrrpo3gaeb3jsbinvvdiat5@cwjw55mna5of
This commit is contained in:
Andres Freund 2024-11-26 12:20:59 -05:00
parent 4ee130c6e0
commit b8f9afc81f
1 changed files with 2 additions and 8 deletions
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10
src/backend/storage/ipc/latch.c
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@ -811,10 +811,7 @@ CreateWaitEventSet(ResourceOwner resowner, int nevents)
#if defined(WAIT_USE_EPOLL)
if (!AcquireExternalFD())
{
/* treat this as though epoll_create1 itself returned EMFILE */
elog(ERROR, "epoll_create1 failed: %m");
}
elog(ERROR, "AcquireExternalFD, for epoll_create1, failed: %m");
set->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (set->epoll_fd < 0)
{
@ -823,10 +820,7 @@ CreateWaitEventSet(ResourceOwner resowner, int nevents)
}
#elif defined(WAIT_USE_KQUEUE)
if (!AcquireExternalFD())
{
/* treat this as though kqueue itself returned EMFILE */
elog(ERROR, "kqueue failed: %m");
}
elog(ERROR, "AcquireExternalFD, for kqueue, failed: %m");
set->kqueue_fd = kqueue();
if (set->kqueue_fd < 0)
{