2 * Copyright (c) 1988, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)sleep.c 8.3 (Berkeley) 4/2/94
35 * $FreeBSD: src/bin/sleep/sleep.c,v 1.9.2.1 2001/08/01 05:23:25 obrien Exp $
36 * $DragonFly: src/bin/sleep/sleep.c,v 1.4 2003/09/28 14:39:15 hmp Exp $
46 int main (int, char *[]);
50 main(int argc, char **argv)
52 struct timespec time_to_sleep;
57 while ((ch = getopt(argc, argv, "")) != -1)
74 /* Skip over leading whitespaces. */
75 while (isspace((unsigned char)*p))
78 /* Check for optional `+' or `-' sign. */
87 /* Calculate seconds. */
88 if (isdigit((unsigned char)*p)) {
89 l = strtol(p, &p, 10);
92 * Avoid overflow when `seconds' is huge. This assumes
93 * that the maximum value for a time_t is >= INT_MAX.
99 time_to_sleep.tv_sec = (time_t)l;
101 /* Calculate nanoseconds. */
102 time_to_sleep.tv_nsec = 0;
104 if (*p == '.') { /* Decimal point. */
107 if (isdigit((unsigned char)*++p))
108 time_to_sleep.tv_nsec += (*p - '0') * l;
114 if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
115 (void)nanosleep(&time_to_sleep, (struct timespec *)NULL);
124 (void)fprintf(stderr, "usage: sleep seconds\n");