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/* $OpenBSD: sleep.c,v 1.24 2015/10/11 20:17:49 guenther Exp $ */
/* $NetBSD: sleep.c,v 1.8 1995/03/21 09:11:11 cgd Exp $ */
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <err.h>
extern char *__progname;
void usage(void);
void alarmh(int);
int
main(int argc, char *argv[])
{
int ch;
time_t secs = 0, t;
char *cp;
long nsecs = 0;
struct timespec rqtp;
int i;
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
signal(SIGALRM, alarmh);
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
cp = *argv;
while ((*cp != '\0') && (*cp != '.')) {
if (!isdigit((unsigned char)*cp))
usage();
t = (secs * 10) + (*cp++ - '0');
if (t / 10 != secs) /* oflow */
return (EINVAL);
secs = t;
}
/* Handle fractions of a second */
if (*cp == '.') {
cp++;
for (i = 100000000; i > 0; i /= 10) {
if (*cp == '\0')
break;
if (!isdigit((unsigned char)*cp))
usage();
nsecs += (*cp++ - '0') * i;
}
/*
* We parse all the way down to nanoseconds
* in the above for loop. Be pedantic about
* checking the rest of the argument.
*/
while (*cp != '\0') {
if (!isdigit((unsigned char)*cp++))
usage();
}
}
rqtp.tv_sec = secs;
rqtp.tv_nsec = nsecs;
if ((secs > 0) || (nsecs > 0))
if (nanosleep(&rqtp, NULL))
err(1, NULL);
return (0);
}
void
usage(void)
{
(void)fprintf(stderr, "usage: %s seconds\n", __progname);
exit(1);
}
/*
* POSIX 1003.2 says sleep should exit with 0 return code on reception
* of SIGALRM.
*/
/* ARGSUSED */
void
alarmh(int signo)
{
/*
* exit() flushes stdio buffers, which is not legal in a signal
* handler. Use _exit().
*/
_exit(0);
}
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