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 * 3. 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 * @(#)sleep.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gen/sleep.c,v 1.28.2.1 2000/03/18 23:13:24 jasone Exp $
31 */
32
33 #include "namespace.h"
34 #include <errno.h>
35 #include <limits.h>
36 #include <time.h>
37 #include <unistd.h>
38 #include "un-namespace.h"
39
40 unsigned int __sleep(unsigned int);
41
42 unsigned int
__sleep(unsigned int seconds)43 __sleep(unsigned int seconds)
44 {
45 struct timespec time_to_sleep;
46 struct timespec time_remaining;
47
48 /*
49 * Avoid overflow when `seconds' is huge. This assumes that
50 * the maximum value for a time_t is >= INT_MAX.
51 */
52 if (seconds > INT_MAX)
53 return (seconds - INT_MAX + __sleep(INT_MAX));
54
55 time_to_sleep.tv_sec = seconds;
56 time_to_sleep.tv_nsec = 0;
57 if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
58 return (0);
59 if (errno != EINTR)
60 return (seconds); /* best guess */
61 return (time_remaining.tv_sec +
62 (time_remaining.tv_nsec != 0)); /* round up */
63 }
64
65 __weak_reference(__sleep, sleep);
66 __weak_reference(__sleep, _sleep);
67
68