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 static void usage(void);
56 static volatile sig_atomic_t report_requested;
58 report_request(int signo __unused)
65 main(int argc, char *argv[])
67 struct timespec time_to_sleep;
77 /* Skip over leading whitespaces. */
78 while (isspace((unsigned char)*p))
81 /* Check for optional `+' or `-' sign. */
86 if (!isdigit((unsigned char)*p) && *p != '.')
92 /* Calculate seconds. */
93 if (isdigit((unsigned char)*p)) {
94 l = strtol(p, &p, 10);
97 * Avoid overflow when `seconds' is huge. This assumes
98 * that the maximum value for a time_t is <= INT_MAX.
104 time_to_sleep.tv_sec = (time_t)l;
106 /* Calculate nanoseconds. */
107 time_to_sleep.tv_nsec = 0;
109 if (*p == '.') { /* Decimal point. */
112 if (isdigit((unsigned char)*++p))
113 time_to_sleep.tv_nsec += (*p - '0') * l;
120 /* Skip over the trailing whitespace. */
121 while (isspace((unsigned char)*p))
126 signal(SIGINFO, report_request);
127 if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0)) {
128 original = time_to_sleep.tv_sec;
129 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
130 if (report_requested) {
132 * Reporting does not bother with
133 * fractions of a second...
135 warnx("about %jd second(s) left"
136 " out of the original %jd",
137 (intmax_t)time_to_sleep.tv_sec,
139 report_requested = 0;
151 static const char msg[] = "usage: sleep seconds\n";
153 write(STDERR_FILENO, msg, sizeof(msg) - 1);