/*-
 * 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_ */