OpenBSD-4.6/sbin/reboot/reboot.c
/* $OpenBSD: reboot.c,v 1.29 2007/05/11 01:53:07 tedu Exp $ */
/* $NetBSD: reboot.c,v 1.8 1995/10/05 05:36:22 mycroft 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.
*/
#ifndef lint
static 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";
#else
static char rcsid[] = "$OpenBSD: reboot.c,v 1.29 2007/05/11 01:53:07 tedu Exp $";
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/reboot.h>
#include <sys/fcntl.h>
#include <sys/wait.h>
#include <signal.h>
#include <pwd.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <termios.h>
#include <syslog.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include <util.h>
void usage(void);
extern char *__progname;
int dohalt;
#define _PATH_RC "/etc/rc"
int
main(int argc, char *argv[])
{
unsigned int i;
struct passwd *pw;
int ch, howto, lflag, nflag, pflag, qflag;
char *p, *user;
p = __progname;
/* Nuke login shell */
if (*p == '-')
p++;
howto = dohalt = lflag = nflag = pflag = qflag = 0;
if (!strcmp(p, "halt")) {
dohalt = 1;
howto = RB_HALT;
}
while ((ch = getopt(argc, argv, "dlnpq")) != -1)
switch (ch) {
case 'd':
howto |= RB_DUMP;
break;
case 'l': /* Undocumented; used by shutdown. */
lflag = 1;
break;
case 'n':
nflag = 1;
howto |= RB_NOSYNC;
break;
case 'p':
/* Only works if we're called as halt. */
if (dohalt) {
pflag = 1;
howto |= RB_POWERDOWN;
}
break;
case 'q':
qflag = 1;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc)
usage();
if (geteuid())
errx(1, "%s", strerror(EPERM));
if (qflag) {
reboot(howto);
err(1, "reboot");
}
/* 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);
if (pflag) {
syslog(LOG_CRIT,
"halted (with powerdown) by %s", user);
} else {
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)
err(1, "SIGTSTP init");
/* Ignore the SIGHUP we get when our parent shell dies. */
(void)signal(SIGHUP, 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);
if (access(_PATH_RC, R_OK) != -1) {
pid_t pid;
struct termios t;
int fd, status;
switch ((pid = fork())) {
case -1:
break;
case 0:
if (revoke(_PATH_CONSOLE) == -1)
warn("revoke");
if (setsid() == -1)
warn("setsid");
fd = open(_PATH_CONSOLE, O_RDWR);
if (fd == -1)
warn("open");
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
/* At a minimum... */
tcgetattr(0, &t);
t.c_oflag |= (ONLCR | OPOST);
tcsetattr(0, TCSANOW, &t);
execl(_PATH_BSHELL, "sh", _PATH_RC, "shutdown", (char *)NULL);
_exit(1);
default:
/* rc exits 2 if powerdown=YES in rc.shutdown */
waitpid(pid, &status, 0);
if (dohalt && WIFEXITED(status) && WEXITSTATUS(status) == 2)
howto |= RB_POWERDOWN;
}
}
/* 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 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 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) {
warnx("WARNING: some process(es) wouldn't die");
break;
}
(void)sleep(2 * i);
}
reboot(howto);
/* FALLTHROUGH */
restart:
errx(1, kill(1, SIGHUP) == -1 ? "(can't restart init): " : "");
/* NOTREACHED */
}
void
usage(void)
{
fprintf(stderr, "usage: %s [-dn%sq]\n", __progname,
dohalt ? "p" : "");
exit(1);
}