3f5ac575ea
the root filesystem without full reboot, using "reboot -r". This can be used to to eg. boot from a temporary md_image preloaded by loader(8), setup an iSCSI session, and continue booting from rootfs mounted over iSCSI. Reviewed by: kib@, bapt@ MFC after: 1 month Relnotes: yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D3693
264 lines
6.4 KiB
C
264 lines
6.4 KiB
C
/*
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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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* 4. 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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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) 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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static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/reboot.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <signal.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <syslog.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 <unistd.h>
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#include <utmpx.h>
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static void usage(void);
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static u_int get_pageins(void);
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static int dohalt;
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int
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main(int argc, char *argv[])
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{
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struct utmpx utx;
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const struct passwd *pw;
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int ch, howto, i, fd, lflag, nflag, qflag, sverrno;
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u_int pageins;
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const char *user, *kernel = NULL;
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if (strcmp(getprogname(), "halt") == 0) {
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dohalt = 1;
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howto = RB_HALT;
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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, "dk:lnpqr")) != -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 'k':
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kernel = optarg;
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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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howto |= RB_POWEROFF;
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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 'r':
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howto |= RB_REROOT;
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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 ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
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errx(1, "cannot dump (-d) when halting; must reboot instead");
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if ((howto & RB_REROOT) != 0 && howto != RB_REROOT)
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errx(1, "-r cannot be used with -d, -n, or -p");
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if (geteuid()) {
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errno = EPERM;
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err(1, NULL);
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}
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if (qflag) {
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reboot(howto);
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err(1, NULL);
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}
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if (kernel != NULL) {
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fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC,
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0444);
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if (fd > -1) {
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(void)write(fd, "nextboot_enable=\"YES\"\n", 22);
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(void)write(fd, "kernel=\"", 8L);
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(void)write(fd, kernel, strlen(kernel));
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(void)write(fd, "\"\n", 2);
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close(fd);
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}
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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", 0, LOG_AUTH | LOG_CONS);
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syslog(LOG_CRIT, "halted by %s", user);
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} else if (howto & RB_REROOT) {
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openlog("reroot", 0, LOG_AUTH | LOG_CONS);
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syslog(LOG_CRIT, "rerooted by %s", user);
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} else {
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openlog("reboot", 0, LOG_AUTH | LOG_CONS);
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syslog(LOG_CRIT, "rebooted by %s", user);
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}
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}
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utx.ut_type = SHUTDOWN_TIME;
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gettimeofday(&utx.ut_tv, NULL);
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pututxline(&utx);
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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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/*
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* Only init(8) can perform rerooting.
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*/
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if (howto & RB_REROOT) {
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if (kill(1, SIGEMT) == -1)
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err(1, "SIGEMT init");
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return (0);
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}
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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 && errno != ESRCH)
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err(1, "SIGTERM processes");
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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 give everybody a chance. If there is a lot of
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* paging activity then wait longer, up to a maximum of approx
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* 60 seconds.
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*/
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sleep(2);
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for (i = 0; i < 20; i++) {
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pageins = get_pageins();
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if (!nflag)
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sync();
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sleep(3);
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if (get_pageins() == pageins)
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break;
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}
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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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goto restart;
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}
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if (i > 5) {
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(void)fprintf(stderr,
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"WARNING: some process(es) wouldn't die\n");
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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);
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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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static void
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usage(void)
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{
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(void)fprintf(stderr, dohalt ?
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"usage: halt [-lnpq] [-k kernel]\n" :
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"usage: reboot [-dlnpq] [-k kernel]\n");
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exit(1);
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}
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static u_int
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get_pageins(void)
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{
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u_int pageins;
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size_t len;
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len = sizeof(pageins);
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if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
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!= 0) {
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warnx("v_swappgsin");
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return (0);
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}
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return pageins;
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}
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