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Cope with glibc too old to have epoll_create1().

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Commit fa31b6f4e supposed that we didn't have to worry about that
anymore, but it seems that RHEL5 is like that, and that's still
a supported platform.  Put back the prior coding under an #ifdef,
adding an explicit fcntl() to retain the desired CLOEXEC property.

Discussion: https://postgr.es/m/12307.1493325329@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2017-04-27 17:13:29 -04:00
parent 28afff347a
commit 53b1578460
1 changed files with 9 additions and 0 deletions
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9
src/backend/storage/ipc/latch.c
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@ -574,9 +574,18 @@ CreateWaitEventSet(MemoryContext context, int nevents)
set->nevents_space = nevents;
#if defined(WAIT_USE_EPOLL)
#ifdef EPOLL_CLOEXEC
set->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (set->epoll_fd < 0)
elog(ERROR, "epoll_create1 failed: %m");
#else
/* cope with ancient glibc lacking epoll_create1 (e.g., RHEL5) */
set->epoll_fd = epoll_create(nevents);
if (set->epoll_fd < 0)
elog(ERROR, "epoll_create failed: %m");
if (fcntl(set->epoll_fd, F_SETFD, FD_CLOEXEC) == -1)
elog(ERROR, "fcntl(F_SETFD) failed on epoll descriptor: %m");
#endif /* EPOLL_CLOEXEC */
#elif defined(WAIT_USE_WIN32)
/*