/* Copyright (C) 2006-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2006. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <limits.h> #include <signal.h> #include <stddef.h> /* For NULL. */ #include <sys/poll.h> #include <sysdep-cancel.h> int ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout, const sigset_t *sigmask) { int tval = -1; /* poll uses a simple millisecond value. Convert it. */ if (timeout != NULL) { if (timeout->tv_sec < 0 || timeout->tv_nsec < 0 || timeout->tv_nsec >= 1000000000) { __set_errno (EINVAL); return -1; } if (timeout->tv_sec > INT_MAX / 1000 || (timeout->tv_sec == INT_MAX / 1000 && ((timeout->tv_nsec + 999999) / 1000000 > INT_MAX % 1000))) /* We cannot represent the timeout in an int value. Wait forever. */ tval = -1; else tval = (timeout->tv_sec * 1000 + (timeout->tv_nsec + 999999) / 1000000); } /* The setting and restoring of the signal mask and the select call should be an atomic operation. This can't be done without kernel help. */ sigset_t savemask; if (sigmask != NULL) __sigprocmask (SIG_SETMASK, sigmask, &savemask); /* Note the ppoll() is a cancellation point. But since we call poll() which itself is a cancellation point we do not have to do anything here. */ int retval = __poll (fds, nfds, tval); if (sigmask != NULL) __sigprocmask (SIG_SETMASK, &savemask, NULL); return retval; } #ifndef ppoll libc_hidden_def (ppoll); #endif