249 lines
6.1 KiB
C
249 lines
6.1 KiB
C
/* $NetBSD: reboot.c,v 1.35 2008/02/09 04:27:06 dholland Exp $ */
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/*
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* Copyright (c) 1980, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1986, 1993\n"
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" The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93";
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#else
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__RCSID("$NetBSD: reboot.c,v 1.35 2008/02/09 04:27:06 dholland Exp $");
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#endif
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#endif /* not lint */
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#include <sys/reboot.h>
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#include <err.h>
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#include <errno.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <util.h>
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int main(int, char *[]);
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void usage(void);
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int dohalt;
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int dopoweroff;
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int
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main(int argc, char *argv[])
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{
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const char *progname;
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int i;
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struct passwd *pw;
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int ch, howto, lflag, nflag, qflag, sverrno, len;
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const char *user;
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char *bootstr, **av;
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progname = getprogname();
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if (progname[0] == '-')
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progname++;
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if (strcmp(progname, "halt") == 0) {
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dohalt = 1;
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howto = RB_HALT;
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} else if (strcmp(progname, "poweroff") == 0) {
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dopoweroff = 1;
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howto = RB_HALT | RB_POWERDOWN;
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} else
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howto = 0;
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lflag = nflag = qflag = 0;
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while ((ch = getopt(argc, argv, "dlnpq")) != -1)
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switch(ch) {
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case 'd':
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howto |= RB_DUMP;
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break;
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case 'l':
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lflag = 1;
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break;
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case 'n':
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nflag = 1;
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howto |= RB_NOSYNC;
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break;
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case 'p':
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if (dohalt == 0)
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usage();
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howto |= RB_POWERDOWN;
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break;
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case 'q':
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qflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc) {
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for (av = argv, len = 0; *av; av++)
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len += strlen(*av) + 1;
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bootstr = malloc(len + 1);
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*bootstr = '\0'; /* for first strcat */
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for (av = argv; *av; av++) {
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strcat(bootstr, *av);
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strcat(bootstr, " ");
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}
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bootstr[len - 1] = '\0'; /* to kill last space */
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howto |= RB_STRING;
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} else
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bootstr = NULL;
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if (geteuid())
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errx(1, "%s", strerror(EPERM));
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if (qflag) {
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reboot(howto, bootstr);
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err(1, "reboot");
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}
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/* Log the reboot. */
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if (!lflag) {
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if ((user = getlogin()) == NULL)
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user = (pw = getpwuid(getuid())) ?
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pw->pw_name : "???";
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if (dohalt) {
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openlog("halt", LOG_CONS, LOG_AUTH);
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syslog(LOG_CRIT, "halted by %s", user);
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} else if (dopoweroff) {
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openlog("poweroff", LOG_CONS, LOG_AUTH);
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syslog(LOG_CRIT, "powered off by %s", user);
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} else {
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openlog("reboot", LOG_CONS, LOG_AUTH);
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if (bootstr)
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syslog(LOG_CRIT, "rebooted by %s: %s", user,
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bootstr);
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else
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syslog(LOG_CRIT, "rebooted by %s", user);
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}
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}
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#ifdef SUPPORT_UTMP
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logwtmp("~", "shutdown", "");
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#endif
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#ifdef SUPPORT_UTMPX
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logwtmpx("~", "shutdown", "", INIT_PROCESS, 0);
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#endif
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/*
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* Do a sync early on, so disks start transfers while we're off
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* killing processes. Don't worry about writes done before the
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* processes die, the reboot system call syncs the disks.
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*/
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if (!nflag)
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sync();
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/*
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* Ignore signals that we can get as a result of killing
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* parents, group leaders, etc.
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*/
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(void)signal(SIGHUP, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGTERM, SIG_IGN);
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(void)signal(SIGTSTP, SIG_IGN);
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/*
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* If we're running in a pipeline, we don't want to die
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* after killing whatever we're writing to.
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*/
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(void)signal(SIGPIPE, SIG_IGN);
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/* Just stop init -- if we fail, we'll restart it. */
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if (kill(1, SIGTSTP) == -1)
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err(1, "SIGTSTP init");
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/* Send a SIGTERM first, a chance to save the buffers. */
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if (kill(-1, SIGTERM) == -1) {
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/*
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* If ESRCH, everything's OK: we're the only non-system
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* process! That can happen e.g. via 'exec reboot' in
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* single-user mode.
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*/
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if (errno != ESRCH) {
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warn("SIGTERM all processes");
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goto restart;
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}
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}
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/*
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* After the processes receive the signal, start the rest of the
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* buffers on their way. Wait 5 seconds between the SIGTERM and
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* the SIGKILL to pretend to give everybody a chance.
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*/
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sleep(2);
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if (!nflag)
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sync();
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sleep(3);
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for (i = 1;; ++i) {
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if (kill(-1, SIGKILL) == -1) {
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if (errno == ESRCH)
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break;
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warn("SIGKILL all processes");
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goto restart;
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}
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if (i > 5) {
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warnx("WARNING: some process(es) wouldn't die");
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break;
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}
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(void)sleep(2 * i);
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}
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reboot(howto, bootstr);
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warn("reboot()");
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/* FALLTHROUGH */
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restart:
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sverrno = errno;
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errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
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strerror(sverrno));
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/* NOTREACHED */
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}
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void
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usage(void)
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{
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const char *pflag = dohalt ? "p" : "";
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(void)fprintf(stderr, "usage: %s [-dln%sq] [-- <boot string>]\n",
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getprogname(), pflag);
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exit(1);
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}
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