mirror of
https://github.com/freebsd/freebsd-src
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2295cae7e6
Program: * Add a dummy getopt(3) loop to handle `--`. * Move interval parsing out into a separate function. * Print a diagnostic for every invalid interval. * Check for NaN and infinity. * Improve bounds checks. Manual page: * Miscellaneous markup fixes. * Reword DESCRIPTION section. * Move text about GNU compatibility to STANDARDS section. * Convert examples from csh to sh. Sponsored by: Klara, Inc. Reviewed by: kevans Differential Revision: https://reviews.freebsd.org/D44471
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*-
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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 <capsicum_helpers.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <math.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 volatile sig_atomic_t report_requested;
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static void
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report_request(int signo __unused)
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{
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report_requested = 1;
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}
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static void __dead2
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usage(void)
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{
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fprintf(stderr, "usage: sleep number[unit] [...]\n"
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"Unit can be 's' (seconds, the default), "
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"m (minutes), h (hours), or d (days).\n");
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exit(1);
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}
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static double
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parse_interval(const char *arg)
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{
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double num;
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char unit, extra;
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switch (sscanf(arg, "%lf%c%c", &num, &unit, &extra)) {
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case 2:
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switch (unit) {
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case 'd':
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num *= 24;
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/* FALLTHROUGH */
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case 'h':
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num *= 60;
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/* FALLTHROUGH */
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case 'm':
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num *= 60;
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/* FALLTHROUGH */
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case 's':
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if (!isnan(num))
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return (num);
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}
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break;
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case 1:
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if (!isnan(num))
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return (num);
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}
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warnx("invalid time interval: %s", arg);
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return (INFINITY);
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}
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int
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main(int argc, char *argv[])
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{
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struct timespec time_to_sleep;
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double seconds;
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time_t original;
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if (caph_limit_stdio() < 0 || caph_enter() < 0)
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err(1, "capsicum");
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while (getopt(argc, argv, "") != -1)
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usage();
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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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seconds = 0;
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while (argc--)
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seconds += parse_interval(*argv++);
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if (seconds > INT_MAX)
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usage();
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if (seconds < 1e-9)
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exit(0);
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original = time_to_sleep.tv_sec = (time_t)seconds;
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time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec);
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signal(SIGINFO, report_request);
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while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
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if (errno != EINTR)
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err(1, "nanosleep");
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if (report_requested) {
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/* Reporting does not bother with nanoseconds. */
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warnx("about %ld second(s) left out of the original %ld",
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(long)time_to_sleep.tv_sec, (long)original);
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report_requested = 0;
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}
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}
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exit(0);
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}
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