1/*-
2 * Copyright (c) 2012 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Pawel Jakub Dawidek under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef	_SIGTIMEDWAIT_H_
31#define	_SIGTIMEDWAIT_H_
32
33#include <sys/types.h>
34#include <sys/time.h>
35
36#include <assert.h>
37#include <errno.h>
38#include <signal.h>
39#include <stdio.h>
40#include <string.h>
41#include <unistd.h>
42
43#include "pjdlog.h"
44
45static int
46sigtimedwait(const sigset_t *set, siginfo_t *info,
47    const struct timespec *timeout)
48{
49	struct itimerval it;
50	sigset_t mask;
51	int error, signo;
52
53	PJDLOG_ASSERT(info == NULL);
54
55	PJDLOG_VERIFY(sigemptyset(&mask) == 0);
56	PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0);
57	PJDLOG_VERIFY(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
58
59	timerclear(&it.it_interval);
60	it.it_value.tv_sec = timeout->tv_sec;
61	it.it_value.tv_usec = timeout->tv_nsec / 1000;
62	if (it.it_value.tv_sec == 0 && it.it_value.tv_usec == 0)
63		it.it_value.tv_usec = 1;
64	PJDLOG_VERIFY(setitimer(ITIMER_REAL, &it, NULL) == 0);
65
66	bcopy(set, &mask, sizeof(mask));
67	PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0);
68
69	PJDLOG_VERIFY(sigwait(&mask, &signo) == 0);
70	error = errno;
71
72	timerclear(&it.it_interval);
73	timerclear(&it.it_value);
74	PJDLOG_VERIFY(setitimer(ITIMER_REAL, &it, NULL) == 0);
75
76	PJDLOG_VERIFY(sigemptyset(&mask) == 0);
77	PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0);
78	PJDLOG_VERIFY(sigprocmask(SIG_UNBLOCK, &mask, NULL) == 0);
79
80	if (signo == SIGALRM) {
81		errno = EAGAIN;
82		signo = -1;
83	} else {
84		errno = error;
85	}
86
87	return (signo);
88}
89
90#endif	/* !_SIGTIMEDWAIT_H_ */
91