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