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glibc/io/ppoll.c
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/* Copyright (C) 2006-2016 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 | |
/* __poll handles cancellation. */ | |
LIBC_CANCEL_HANDLED (); | |
libc_hidden_def (ppoll); | |
#endif |