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 <sys/cdefs.h>
33 __SCCSID("@(#)sleep.c 8.1 (Berkeley) 6/4/93");
34 __FBSDID("$FreeBSD: stable/12/lib/libc/gen/sleep.c 335898 2018-07-03 17:31:45Z jhb $");
35
36 #include "namespace.h"
37 #include <errno.h>
38 #include <limits.h>
39 #include <time.h>
40 #include <unistd.h>
41 #include "un-namespace.h"
42
43 #include "libc_private.h"
44
45 unsigned int __sleep(unsigned int);
46
47 unsigned int
__sleep(unsigned int seconds)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 (((int (*)(const struct timespec *, struct timespec *))
63 __libc_interposing[INTERPOS_nanosleep])(
64 &time_to_sleep, &time_remaining) != -1)
65 return (0);
66 if (errno != EINTR)
67 return (seconds); /* best guess */
68 return (time_remaining.tv_sec +
69 (time_remaining.tv_nsec != 0)); /* round up */
70 }
71
72 __weak_reference(__sleep, sleep);
73 __weak_reference(__sleep, _sleep);
74