From 0fe32c80063feb75cae18025174342a150e2ba5c Mon Sep 17 00:00:00 2001 From: "Anthony G. Basile" Date: Mon, 21 Mar 2016 10:58:20 -0400 Subject: src/shared/util.c: add fallback for ppoll(), issue #129. Signed-off-by: Anthony G. Basile --- src/shared/util.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'src/shared/util.c') diff --git a/src/shared/util.c b/src/shared/util.c index 88defdc4f2..3f6c1dcde4 100644 --- a/src/shared/util.c +++ b/src/shared/util.c @@ -1091,6 +1091,21 @@ bool nulstr_contains(const char*nulstr, const char *needle) { return false; } + +static inline int ppoll_fallback(struct pollfd *fds, nfds_t nfds, const struct timespec *timeout_ts, const sigset_t *sigmask) { + int ready, timeout; + sigset_t origmask; + + timeout = (timeout_ts == NULL) ? -1 : (timeout_ts->tv_sec * 1000 + timeout_ts->tv_nsec / 1000000); + + /* This is racey, but what can we do without ppoll? */ + sigprocmask(SIG_SETMASK, sigmask, &origmask); + ready = poll(fds, nfds, timeout); + sigprocmask(SIG_SETMASK, &origmask, NULL); + + return ready; +} + int fd_wait_for_event(int fd, int event, usec_t t) { struct pollfd pollfd = { @@ -1101,7 +1116,12 @@ int fd_wait_for_event(int fd, int event, usec_t t) { struct timespec ts; int r; +#ifdef HAVE_DECL_PPOLL r = ppoll(&pollfd, 1, t == USEC_INFINITY ? NULL : timespec_store(&ts, t), NULL); +#else + /* Fallback path when ppoll() is unavailable */ + r = ppoll_fallback(&pollfd, 1, t == USEC_INFINITY ? NULL : timespec_store(&ts, t), NULL); +#endif if (r < 0) return -errno; -- cgit v1.2.3-54-g00ecf