126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/* $OpenBSD: sleep.c,v 1.29 2020/02/25 15:46:15 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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#include <sys/time.h>
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#include <ctype.h>
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#include <err.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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void alarmh(int);
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void usage(void);
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int
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main(int argc, char *argv[])
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{
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struct timespec rqtp;
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time_t t;
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char *cp;
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int ch, i;
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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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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}
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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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timespecclear(&rqtp);
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/* Handle whole seconds. */
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for (cp = argv[0]; *cp != '\0' && *cp != '.'; cp++) {
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if (!isdigit((unsigned char)*cp))
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errx(1, "seconds is invalid: %s", argv[0]);
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t = (rqtp.tv_sec * 10) + (*cp - '0');
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if (t / 10 != rqtp.tv_sec) /* overflow */
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errx(1, "seconds is too large: %s", argv[0]);
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rqtp.tv_sec = t;
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}
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/*
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* Handle fractions of a second. The multiplier divides to zero
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* after nine digits so anything more precise than a nanosecond is
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* validated but not used.
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*/
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if (*cp == '.') {
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i = 100000000;
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for (cp++; *cp != '\0'; cp++) {
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if (!isdigit((unsigned char)*cp))
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errx(1, "seconds is invalid: %s", argv[0]);
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rqtp.tv_nsec += (*cp - '0') * i;
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i /= 10;
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}
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}
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if (timespecisset(&rqtp)) {
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if (nanosleep(&rqtp, NULL) == -1)
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err(1, "nanosleep");
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}
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return 0;
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}
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void
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usage(void)
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{
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fprintf(stderr, "usage: %s seconds\n", getprogname());
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exit(1);
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}
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/*
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* POSIX.1 says sleep(1) may exit with status zero upon receipt
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* of SIGALRM.
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*/
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void
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alarmh(int signo)
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{
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/*
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* Always _exit(2) from signal handlers: exit(3) is not
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* generally signal-safe.
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*/
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_exit(0);
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}
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