1/*
2 * Copyright (c) 1989, 1993
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.
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
30#if defined(VARIANT_CANCELABLE) && __DARWIN_NON_CANCELABLE != 0
31#error cancellable call vs. __DARWIN_NON_CANCELABLE mismatch
32#endif
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)sleep.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: src/lib/libc/gen/sleep.c,v 1.33 2009/12/05 19:31:38 ed Exp $");
39
40#include "namespace.h"
41#include <errno.h>
42#include <limits.h>
43#include <time.h>
44#include <unistd.h>
45#include "un-namespace.h"
46
47unsigned int
48__sleep(unsigned int seconds)
49{
50	struct timespec time_to_sleep;
51	struct timespec time_remaining;
52
53	/*
54	 * Avoid overflow when `seconds' is huge.  This assumes that
55	 * the maximum value for a time_t is >= INT_MAX.
56	 */
57	if (seconds > INT_MAX)
58		return (seconds - INT_MAX + __sleep(INT_MAX));
59
60	time_to_sleep.tv_sec = seconds;
61	time_to_sleep.tv_nsec = 0;
62	if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
63		return (0);
64	if (errno != EINTR)
65		return (seconds);		/* best guess */
66	return (time_remaining.tv_sec +
67		(time_remaining.tv_nsec != 0)); /* round up */
68}
69
70__weak_reference(__sleep, sleep);
71__weak_reference(__sleep, _sleep);
72