NetBSD-5.0.2/sbin/reboot/reboot.c
/* $NetBSD: reboot.c,v 1.36 2008/07/20 01:20:23 lukem Exp $ */
/*
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1986, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93";
#else
__RCSID("$NetBSD: reboot.c,v 1.36 2008/07/20 01:20:23 lukem Exp $");
#endif
#endif /* not lint */
#include <sys/reboot.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <util.h>
int main(int, char *[]);
void usage(void);
int dohalt;
int dopoweroff;
int
main(int argc, char *argv[])
{
const char *progname;
int i;
struct passwd *pw;
int ch, howto, lflag, nflag, qflag, sverrno, len;
const char *user;
char *bootstr, **av;
progname = getprogname();
if (progname[0] == '-')
progname++;
if (strcmp(progname, "halt") == 0) {
dohalt = 1;
howto = RB_HALT;
} else if (strcmp(progname, "poweroff") == 0) {
dopoweroff = 1;
howto = RB_HALT | RB_POWERDOWN;
} else
howto = 0;
lflag = nflag = qflag = 0;
while ((ch = getopt(argc, argv, "dlnpq")) != -1)
switch(ch) {
case 'd':
howto |= RB_DUMP;
break;
case 'l':
lflag = 1;
break;
case 'n':
nflag = 1;
howto |= RB_NOSYNC;
break;
case 'p':
if (dohalt == 0)
usage();
howto |= RB_POWERDOWN;
break;
case 'q':
qflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc) {
for (av = argv, len = 0; *av; av++)
len += strlen(*av) + 1;
bootstr = malloc(len + 1);
*bootstr = '\0'; /* for first strcat */
for (av = argv; *av; av++) {
strcat(bootstr, *av);
strcat(bootstr, " ");
}
bootstr[len - 1] = '\0'; /* to kill last space */
howto |= RB_STRING;
} else
bootstr = NULL;
if (geteuid())
errx(1, "%s", strerror(EPERM));
if (qflag) {
reboot(howto, bootstr);
err(1, "reboot");
}
/* Log the reboot. */
if (!lflag) {
if ((user = getlogin()) == NULL)
user = (pw = getpwuid(getuid())) ?
pw->pw_name : "???";
if (dohalt) {
openlog("halt", LOG_CONS, LOG_AUTH);
syslog(LOG_CRIT, "halted by %s", user);
} else if (dopoweroff) {
openlog("poweroff", LOG_CONS, LOG_AUTH);
syslog(LOG_CRIT, "powered off by %s", user);
} else {
openlog("reboot", LOG_CONS, LOG_AUTH);
if (bootstr)
syslog(LOG_CRIT, "rebooted by %s: %s", user,
bootstr);
else
syslog(LOG_CRIT, "rebooted by %s", user);
}
}
#ifdef SUPPORT_UTMP
logwtmp("~", "shutdown", "");
#endif
#ifdef SUPPORT_UTMPX
logwtmpx("~", "shutdown", "", INIT_PROCESS, 0);
#endif
/*
* 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();
/*
* Ignore signals that we can get as a result of killing
* parents, group leaders, etc.
*/
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGTERM, SIG_IGN);
(void)signal(SIGTSTP, SIG_IGN);
/*
* If we're running in a pipeline, we don't want to die
* after killing whatever we're writing to.
*/
(void)signal(SIGPIPE, SIG_IGN);
/* Just stop init -- if we fail, we'll restart it. */
if (kill(1, SIGTSTP) == -1)
err(1, "SIGTSTP init");
/* Send a SIGTERM first, a chance to save the buffers. */
if (kill(-1, SIGTERM) == -1) {
/*
* If ESRCH, everything's OK: we're the only non-system
* process! That can happen e.g. via 'exec reboot' in
* single-user mode.
*/
if (errno != ESRCH) {
warn("SIGTERM all processes");
goto restart;
}
}
/*
* 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 pretend 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;
warn("SIGKILL all processes");
goto restart;
}
if (i > 5) {
warnx("WARNING: some process(es) wouldn't die");
break;
}
(void)sleep(2 * i);
}
reboot(howto, bootstr);
warn("reboot()");
/* FALLTHROUGH */
restart:
sverrno = errno;
errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
strerror(sverrno));
/* NOTREACHED */
}
void
usage(void)
{
const char *pflag = dohalt ? "p" : "";
(void)fprintf(stderr, "usage: %s [-dln%sq] [-- <boot string>]\n",
getprogname(), pflag);
exit(1);
}