142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/* $OpenBSD: sleep.c,v 1.26 2018/02/04 02:18:15 cheloha Exp $ */
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/* $NetBSD: sleep.c,v 1.8 1995/03/21 09:11:11 cgd Exp $ */
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/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define _DEFAULT_SOURCE
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#include <ctype.h>
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#include <err.h>
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#include <libgen.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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static const char *__progname;
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void usage(void);
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void alarmh(int);
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int main(int argc, char *argv[]) {
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int ch;
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time_t secs = 0, t;
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char *cp;
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long nsecs = 0;
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struct timespec rqtp;
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int i;
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__progname = basename(argv[0]);
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signal(SIGALRM, alarmh);
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while ((ch = getopt(argc, argv, "")) != -1)
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switch (ch) {
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage();
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cp = *argv;
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while ((*cp != '\0') && (*cp != '.')) {
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if (!isdigit((unsigned char)*cp))
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errx(1, "seconds is invalid: %s", *argv);
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t = (secs * 10) + (*cp++ - '0');
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if (t / 10 != secs) /* oflow */
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errx(1, "seconds is too large: %s", *argv);
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secs = t;
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}
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/* Handle fractions of a second */
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if (*cp == '.') {
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cp++;
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for (i = 100000000; i > 0; i /= 10) {
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if (*cp == '\0')
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break;
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if (!isdigit((unsigned char)*cp))
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errx(1, "seconds is invalid: %s", *argv);
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nsecs += (*cp++ - '0') * i;
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}
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/*
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* We parse all the way down to nanoseconds
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* in the above for loop. Be pedantic about
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* checking the rest of the argument.
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*/
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while (*cp != '\0') {
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if (!isdigit((unsigned char)*cp++))
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errx(1, "seconds is invalid: %s", *argv);
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}
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}
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while (secs > 0 || nsecs > 0) {
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/*
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* nanosleep(2) supports a maximum of 100 million
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* seconds, so we break the nap up into multiple
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* calls if we have more than that.
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*/
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if (secs > 100000000) {
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rqtp.tv_sec = 100000000;
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rqtp.tv_nsec = 0;
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} else {
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rqtp.tv_sec = secs;
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rqtp.tv_nsec = nsecs;
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}
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if (nanosleep(&rqtp, NULL))
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err(1, NULL);
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secs -= rqtp.tv_sec;
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nsecs -= rqtp.tv_nsec;
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}
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return (0);
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}
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void usage(void) {
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(void)fprintf(stderr, "usage: %s seconds\n", __progname);
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exit(1);
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}
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/*
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* POSIX 1003.2 says sleep should exit with 0 return code on reception
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* of SIGALRM.
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*/
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/* ARGSUSED */
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void alarmh(int signo) {
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/*
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* exit() flushes stdio buffers, which is not legal in a signal
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* handler. Use _exit().
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*/
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_exit(0);
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}
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