freebsd-dev/sbin/reboot/reboot.c

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/*
* Copyright (c) 1980, 1986, 1993
* 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.
* 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1986, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93";
#endif
static const char rcsid[] =
"$Id$";
#endif /* not lint */
#include <sys/reboot.h>
#include <sys/types.h>
#include <signal.h>
#include <err.h>
#include <errno.h>
#include <libutil.h>
#include <pwd.h>
#include <syslog.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
void usage __P((void));
int dohalt;
int
main(argc, argv)
int argc;
char *argv[];
{
register int i;
struct passwd *pw;
int ch, howto, lflag, nflag, qflag, pflag, sverrno;
char *p, *user;
if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
dohalt = 1;
howto = RB_HALT;
} else
howto = 0;
lflag = nflag = qflag = 0;
while ((ch = getopt(argc, argv, "lnpq")) != -1)
switch(ch) {
case 'l': /* Undocumented; used by shutdown. */
lflag = 1;
break;
case 'n':
nflag = 1;
howto |= RB_NOSYNC;
break;
case 'p':
pflag = 1;
howto |= (RB_POWEROFF | RB_HALT);
break;
case 'q':
qflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
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if (geteuid()) {
errno = EPERM;
err(1, NULL);
}
if (qflag) {
reboot(howto);
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err(1, NULL);
}
/* Log the reboot. */
if (!lflag) {
if ((user = getlogin()) == NULL)
user = (pw = getpwuid(getuid())) ?
pw->pw_name : "???";
if (dohalt) {
openlog("halt", 0, LOG_AUTH | LOG_CONS);
syslog(LOG_CRIT, "halted by %s", user);
} else {
openlog("reboot", 0, LOG_AUTH | LOG_CONS);
syslog(LOG_CRIT, "rebooted by %s", user);
}
}
logwtmp("~", "shutdown", "");
/*
* Do a sync early on, so disks start transfers while we're off
* killing processes. Don't worry about writes done before the
* processes die, the reboot system call syncs the disks.
*/
if (!nflag)
sync();
/* Just stop init -- if we fail, we'll restart it. */
if (kill(1, SIGTSTP) == -1)
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err(1, "SIGTSTP init");
/* Ignore the SIGHUP we get when our parent shell dies. */
(void)signal(SIGHUP, SIG_IGN);
/* Send a SIGTERM first, a chance to save the buffers. */
if (kill(-1, SIGTERM) == -1)
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err(1, "SIGTERM processes");
/*
* After the processes receive the signal, start the rest of the
* buffers on their way. Wait 5 seconds between the SIGTERM and
* the SIGKILL to give everybody a chance.
*/
sleep(2);
if (!nflag)
sync();
sleep(3);
for (i = 1;; ++i) {
if (kill(-1, SIGKILL) == -1) {
if (errno == ESRCH)
break;
goto restart;
}
if (i > 5) {
(void)fprintf(stderr,
"WARNING: some process(es) wouldn't die\n");
break;
}
(void)sleep(2 * i);
}
reboot(howto);
/* FALLTHROUGH */
restart:
sverrno = errno;
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errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
strerror(sverrno));
/* NOTREACHED */
}
void
usage()
{
(void)fprintf(stderr, "usage: %s [-npq]\n", dohalt ? "halt" : "reboot");
exit(1);
}