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/* $NetBSD: sleep.c,v 1.24 2011/08/29 14:51:19 joerg 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 <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: sleep.c,v 1.24 2011/08/29 14:51:19 joerg Exp $");
#endif
#endif /* not lint */
#include <ctype.h>
#include <err.h>
#include <locale.h>
#include <math.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
__dead static void alarmhandle(int);
__dead static void usage(void);
static volatile sig_atomic_t report_requested;
static void
report_request(int signo __unused)
{
report_requested = 1;
}
int
main(int argc, char *argv[])
{
char *arg, *temp;
double fval, ival, val;
struct timespec ntime;
time_t original;
int ch, fracflag, rv;
setprogname(argv[0]);
(void)setlocale(LC_ALL, "");
(void)signal(SIGALRM, alarmhandle);
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
/*
* Okay, why not just use atof for everything? Why bother
* checking if there is a fraction in use? Because the old
* sleep handled the full range of integers, that's why, and a
* double can't handle a large long. This is fairly useless
* given how large a number a double can hold on most
* machines, but now we won't ever have trouble. If you want
* 1000000000.9 seconds of sleep, well, that's your
* problem. Why use an isdigit() check instead of checking for
* a period? Because doing it this way means locales will be
* handled transparently by the atof code.
*/
fracflag = 0;
arg = *argv;
for (temp = arg; *temp != '\0'; temp++)
if (!isdigit((unsigned char)*temp))
fracflag++;
if (fracflag) {
val = atof(arg);
if (val <= 0)
usage();
ival = floor(val);
fval = (1000000000 * (val-ival));
ntime.tv_sec = ival;
ntime.tv_nsec = fval;
}
else {
ntime.tv_sec = atol(arg);
if (ntime.tv_sec <= 0)
return EXIT_SUCCESS;
ntime.tv_nsec = 0;
}
original = ntime.tv_sec;
signal(SIGINFO, report_request);
while ((rv = nanosleep(&ntime, &ntime)) != 0) {
if (report_requested) {
/* Reporting does not bother with nanoseconds. */
warnx("about %d second(s) left out of the original %d",
(int)ntime.tv_sec, (int)original);
report_requested = 0;
} else
break;
}
if (rv == -1)
err(EXIT_FAILURE, "nanosleep failed");
return EXIT_SUCCESS;
/* NOTREACHED */
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: %s seconds\n", getprogname());
exit(EXIT_FAILURE);
/* NOTREACHED */
}
/* ARGSUSED */
static void
alarmhandle(int i)
{
_exit(EXIT_SUCCESS);
/* NOTREACHED */
}
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