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/*
Copyright (C) 2020- The University of Notre Dame
This software is distributed under the GNU General Public License.
See the file COPYING for details.
*/
#include <assert.h>
#include <signal.h>
#include <poll.h>
#include <time.h>
#include <errno.h>
#include "ppoll_compat.h"
static void noop(int sig) {}
int ppoll_compat(struct pollfd fds[], nfds_t nfds, int stoptime) {
assert(fds);
sigset_t mask;
sigemptyset(&mask);
int timeout = stoptime - time(NULL);
if (timeout < 0) return 0;
#ifdef HAS_PPOLL
struct timespec s;
s.tv_nsec = 0;
s.tv_sec = timeout;
return ppoll(fds, nfds, &s, &mask);
#else
sigset_t origmask;
sigprocmask(SIG_SETMASK, &mask, &origmask);
int rc = poll(fds, nfds, timeout*1000);
int saved_errno = errno;
sigprocmask(SIG_SETMASK, &origmask, NULL);
errno = saved_errno;
return rc;
#endif
}
void ppoll_compat_set_up_sigchld(void) {
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, NULL);
signal(SIGCHLD, noop);
}
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