[apple/libc.git] / gen / sleep-fbsd.c

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifdef VARIANT_CANCELABLE
#undef __DARWIN_NON_CANCELABLE
#define __DARWIN_NON_CANCELABLE 0
#endif /* VARIANT_CANCELABLE */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)sleep.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/sleep.c,v 1.33 2009/12/05 19:31:38 ed Exp $");

#include "namespace.h"
#include <errno.h>
#include <limits.h>
#include <time.h>
#include <unistd.h>
#include "un-namespace.h"

unsigned int
__sleep(unsigned int seconds)
{
	struct timespec time_to_sleep;
	struct timespec time_remaining;

	/*
	 * Avoid overflow when `seconds' is huge.  This assumes that
	 * the maximum value for a time_t is >= INT_MAX.
	 */
	if (seconds > INT_MAX)
		return (seconds - INT_MAX + __sleep(INT_MAX));

	time_to_sleep.tv_sec = seconds;
	time_to_sleep.tv_nsec = 0;
	if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
		return (0);
	if (errno != EINTR)
		return (seconds);		/* best guess */
	return (time_remaining.tv_sec +
		(time_remaining.tv_nsec != 0)); /* round up */
}

__weak_reference(__sleep, sleep);
__weak_reference(__sleep, _sleep);
Commit	Line	Data
224c7076 A	1	/*
224c7076 A	2	* Copyright (c) 1989, 1993
e9ce8d39 A	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
e9ce8d39 A	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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
224c7076 A	30	#ifdef VARIANT_CANCELABLE
	31	#undef __DARWIN_NON_CANCELABLE
	32	#define __DARWIN_NON_CANCELABLE 0
	33	#endif /* VARIANT_CANCELABLE */
	34
5b2abdfb	35	#if defined(LIBC_SCCS) && !defined(lint)
224c7076	36	static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
5b2abdfb	37	#endif /* LIBC_SCCS and not lint */
9385eb3d	38	#include <sys/cdefs.h>
1f2f436a	39	__FBSDID("$FreeBSD: src/lib/libc/gen/sleep.c,v 1.33 2009/12/05 19:31:38 ed Exp $");
e9ce8d39	40
224c7076 A	41	#include "namespace.h"
	42	#include <errno.h>
	43	#include <limits.h>
	44	#include <time.h>
	45	#include <unistd.h>
	46	#include "un-namespace.h"
e9ce8d39	47
224c7076	48	unsigned int
1f2f436a	49	__sleep(unsigned int seconds)
e9ce8d39	50	{
224c7076 A	51	struct timespec time_to_sleep;
	52	struct timespec time_remaining;
	53
	54	/*
	55	* Avoid overflow when `seconds' is huge. This assumes that
	56	* the maximum value for a time_t is >= INT_MAX.
	57	*/
	58	if (seconds > INT_MAX)
	59	return (seconds - INT_MAX + __sleep(INT_MAX));
e9ce8d39	60
224c7076 A	61	time_to_sleep.tv_sec = seconds;
	62	time_to_sleep.tv_nsec = 0;
	63	if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
	64	return (0);
	65	if (errno != EINTR)
	66	return (seconds); /* best guess */
	67	return (time_remaining.tv_sec +
	68	(time_remaining.tv_nsec != 0)); /* round up */
e9ce8d39	69	}
224c7076 A	70
	71	__weak_reference(__sleep, sleep);
	72	__weak_reference(__sleep, _sleep);