1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2013 Roy Marples <roy@marples.name>
4 * All rights reserved
5
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/time.h>
29#include <sys/types.h>
30
31#include <limits.h>
32#include <poll.h>
33#include <signal.h>
34#include <unistd.h>
35
36#include "pollts.h"
37
38#warning "This pollts(2) implementation is not entirely race condition safe."
39#warning "Only operating system support for pollts(2) can correct this."
40
41int
42pollts(struct pollfd *__restrict fds, nfds_t nfds,
43    const struct timespec *__restrict ts, const sigset_t *__restrict sigmask)
44{
45	int r, timeout;
46	sigset_t oldset;
47
48	if (ts == NULL)
49		timeout = -1;
50	else if (ts->tv_sec > INT_MAX / 1000 ||
51	    (ts->tv_sec == INT_MAX / 1000 &&
52	    (ts->tv_nsec + 999999) / 1000000 > INT_MAX % 1000000))
53		timeout = INT_MAX;
54	else
55		timeout = ts->tv_sec * 1000 + (ts->tv_nsec + 999999) / 1000000;
56	if (sigmask && sigprocmask(SIG_SETMASK, sigmask, &oldset) == -1)
57		return -1;
58	r = poll(fds, nfds, timeout);
59	if (sigmask && sigprocmask(SIG_SETMASK, &oldset, NULL) == -1)
60		return -1;
61
62	return r;
63}
64