1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include "namespace.h"
33#include <errno.h>
34#include <limits.h>
35#include <time.h>
36#include <unistd.h>
37#include "un-namespace.h"
38
39#include "libc_private.h"
40
41unsigned int __sleep(unsigned int);
42
43unsigned int
44__sleep(unsigned int seconds)
45{
46	struct timespec time_to_sleep;
47	struct timespec time_remaining;
48
49	/*
50	 * Avoid overflow when `seconds' is huge.  This assumes that
51	 * the maximum value for a time_t is >= INT_MAX.
52	 */
53	if (seconds > INT_MAX)
54		return (seconds - INT_MAX + __sleep(INT_MAX));
55
56	time_to_sleep.tv_sec = seconds;
57	time_to_sleep.tv_nsec = 0;
58	if (INTERPOS_SYS(nanosleep, &time_to_sleep, &time_remaining) != -1)
59		return (0);
60	if (errno != EINTR)
61		return (seconds);		/* best guess */
62	return (time_remaining.tv_sec +
63	    (time_remaining.tv_nsec != 0)); /* round up */
64}
65
66__weak_reference(__sleep, sleep);
67__weak_reference(__sleep, _sleep);
68