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
45 static int
sigtimedwait(const sigset_t * set,siginfo_t * info,const struct timespec * timeout)46 sigtimedwait(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