NetBSD/usr.sbin/update/update.c

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/*-
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* Copyright (c) 1987, 1990, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1987, 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
static char sccsid[] = "@(#)update.c 8.1 (Berkeley) 6/6/93";
#else
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__RCSID("$NetBSD: update.c,v 1.6 1997/10/17 13:59:42 lukem Exp $");
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#endif
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#endif /* not lint */
#include <sys/time.h>
#include <err.h>
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#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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int main __P((int, char **));
void mysync __P((int));
void usage __P((void));
int
main(argc, argv)
int argc;
char *argv[];
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{
struct itimerval value;
int ch;
struct sigaction sa;
sigset_t set, oset;
value.it_interval.tv_sec = 30;
value.it_interval.tv_usec = 0;
while ((ch = getopt(argc, argv, "")) != -1) {
switch (ch) {
default:
case '?':
usage();
}
}
argc -= optind;
argv += optind;
if (argc) {
value.it_interval.tv_sec = atoi(argv[0]);
--argc;
++argv;
}
if (argc)
usage();
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daemon(0, 0);
sa.sa_handler = mysync;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGALRM, &sa, (struct sigaction *)0) < 0)
err(1, "sigaction");
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value.it_value = value.it_interval;
if (setitimer(ITIMER_REAL, &value, NULL) < 0)
err(1, "setitimer");
sigemptyset(&set);
sigprocmask(SIG_BLOCK, &set, &oset);
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for (;;)
sigsuspend(&oset);
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/* NOTREACHED */
}
void
mysync(n)
int n;
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{
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(void)sync();
}
void
usage()
{
(void)fprintf(stderr, "usage: update [interval]\n");
exit(1);
}