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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