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Test honestly for <sys/signalfd.h>.

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Commit 6a2a70a02 supposed that any platform having <sys/epoll.h>
would also have <sys/signalfd.h>.  It turns out there are still a
few people using platforms where that's not so, so we'd better make
a separate configure probe for it.  But since it took this long to
notice, I'm content with the decision to not have a separate code
path for epoll-only machines; we'll just fall back to using poll()
for these stragglers.

Per gripe from Gabriela Serventi.  Back-patch to v14 where this
code came in.

Discussion: https://postgr.es/m/CAHOHWE-JjJDfcYuLAAEO7Jk07atFAU47z8TzHzg71gbC0aMy=g@mail.gmail.com
This commit is contained in:
Tom Lane
2022-02-09 14:24:54 -05:00
parent f48385c132
commit c5f5b4dd4b
5 changed files with 10 additions and 6 deletions
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9
src/backend/storage/ipc/latch.c
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@ -43,6 +43,9 @@
#ifdef HAVE_SYS_EVENT_H
#include <sys/event.h>
#endif
#ifdef HAVE_SYS_SIGNALFD_H
#include <sys/signalfd.h>
#endif
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
@ -69,7 +72,7 @@
#if defined(WAIT_USE_EPOLL) || defined(WAIT_USE_POLL) || \
defined(WAIT_USE_KQUEUE) || defined(WAIT_USE_WIN32)
/* don't overwrite manual choice */
#elif defined(HAVE_SYS_EPOLL_H)
#elif defined(HAVE_SYS_EPOLL_H) && defined(HAVE_SYS_SIGNALFD_H)
#define WAIT_USE_EPOLL
#elif defined(HAVE_KQUEUE)
#define WAIT_USE_KQUEUE
@ -81,10 +84,6 @@
#error "no wait set implementation available"
#endif
#ifdef WAIT_USE_EPOLL
#include <sys/signalfd.h>
#endif
/* typedef in latch.h */
struct WaitEventSet
{