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 * 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.
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
32 static char const copyright[] =
33 "@(#) Copyright (c) 1988, 1993, 1994\n\
34 The Regents of the University of California. All rights reserved.\n";
38 static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94";
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
54 main(int argc, char *argv[])
56 struct timespec time_to_sleep;
68 /* Skip over leading whitespaces. */
69 while (isspace((unsigned char)*p))
72 /* Check for optional `+' or `-' sign. */
77 if (!isdigit((unsigned char)*p) && *p != '.') {
85 /* Calculate seconds. */
86 if (isdigit((unsigned char)*p)) {
87 l = strtol(p, &p, 10);
90 * Avoid overflow when `seconds' is huge. This assumes
91 * that the maximum value for a time_t is <= INT_MAX.
97 time_to_sleep.tv_sec = (time_t)l;
99 /* Calculate nanoseconds. */
100 time_to_sleep.tv_nsec = 0;
102 if (*p == '.') { /* Decimal point. */
105 if (isdigit((unsigned char)*++p))
106 time_to_sleep.tv_nsec += (*p - '0') * l;
113 if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
114 (void)nanosleep(&time_to_sleep, (struct timespec *)NULL);
122 const char msg[] = "usage: sleep seconds\n";
124 write(STDERR_FILENO, msg, sizeof(msg) - 1);