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/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2013 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/time.h>
#include <sys/types.h>
#include <limits.h>
#include <poll.h>
#include <signal.h>
#include <unistd.h>
#include "pollts.h"
#warning "This pollts(2) implementation is not entirely race condition safe."
#warning "Only operating system support for pollts(2) can correct this."
int
pollts(struct pollfd *restrict fds, nfds_t nfds,
const struct timespec *restrict ts, const sigset_t *restrict sigmask)
{
int r, timeout;
sigset_t oldset;
if (ts == NULL)
timeout = -1;
else if (ts->tv_sec > INT_MAX / 1000 ||
(ts->tv_sec == INT_MAX / 1000 &&
(ts->tv_nsec + 999999) / 1000000 > INT_MAX % 1000000))
timeout = INT_MAX;
else
timeout = ts->tv_sec * 1000 + (ts->tv_nsec + 999999) / 1000000;
if (sigmask && sigprocmask(SIG_SETMASK, sigmask, &oldset) == -1)
return -1;
r = poll(fds, nfds, timeout);
if (sigmask && sigprocmask(SIG_SETMASK, &oldset, NULL) == -1)
return -1;
return r;
}
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