91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*-
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SIGTIMEDWAIT_H_
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#define _SIGTIMEDWAIT_H_
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#include <sys/types.h>
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#include <sys/time.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "pjdlog.h"
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static int
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sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec *timeout)
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{
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struct itimerval it;
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sigset_t mask;
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int error, signo;
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PJDLOG_ASSERT(info == NULL);
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PJDLOG_VERIFY(sigemptyset(&mask) == 0);
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PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0);
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PJDLOG_VERIFY(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
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timerclear(&it.it_interval);
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it.it_value.tv_sec = timeout->tv_sec;
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it.it_value.tv_usec = timeout->tv_nsec / 1000;
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if (it.it_value.tv_sec == 0 && it.it_value.tv_usec == 0)
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it.it_value.tv_usec = 1;
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PJDLOG_VERIFY(setitimer(ITIMER_REAL, &it, NULL) == 0);
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bcopy(set, &mask, sizeof(mask));
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PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0);
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PJDLOG_VERIFY(sigwait(&mask, &signo) == 0);
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error = errno;
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timerclear(&it.it_interval);
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timerclear(&it.it_value);
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PJDLOG_VERIFY(setitimer(ITIMER_REAL, &it, NULL) == 0);
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PJDLOG_VERIFY(sigemptyset(&mask) == 0);
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PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0);
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PJDLOG_VERIFY(sigprocmask(SIG_UNBLOCK, &mask, NULL) == 0);
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if (signo == SIGALRM) {
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errno = EAGAIN;
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signo = -1;
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} else {
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errno = error;
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}
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return (signo);
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}
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#endif /* !_SIGTIMEDWAIT_H_ */
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