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
41 int
pollts(struct pollfd * __restrict fds,nfds_t nfds,const struct timespec * __restrict ts,const sigset_t * __restrict sigmask)42 pollts(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