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