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110 lines
3.2 KiB
C
110 lines
3.2 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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* 4. 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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#if 0
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1988, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.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 <signal.h>
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#include <stdint.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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static void usage(void);
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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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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 d;
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time_t original;
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char buf[2];
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if (argc != 2)
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usage();
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if (sscanf(argv[1], "%lf%1s", &d, buf) != 1)
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usage();
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if (d > INT_MAX)
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usage();
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if (d <= 0)
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return (0);
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original = time_to_sleep.tv_sec = (time_t)d;
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time_to_sleep.tv_nsec = 1e9 * (d - time_to_sleep.tv_sec);
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signal(SIGINFO, report_request);
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/*
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* Note: [EINTR] is supposed to happen only when a signal was handled
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* but the kernel also returns it when a ptrace-based debugger
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* attaches. This is a bug but it is hard to fix.
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*/
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while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
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if (report_requested) {
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/* Reporting does not bother with nanoseconds. */
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warnx("about %d second(s) left out of the original %d",
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(int)time_to_sleep.tv_sec, (int)original);
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report_requested = 0;
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} else if (errno != EINTR)
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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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static void
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usage(void)
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{
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fprintf(stderr, "usage: sleep seconds\n");
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exit(1);
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}
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