/*- * SPDX-License-Identifier: BSD-3-Clause * * 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. */ #if 0 #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 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; #endif /* not lint */ #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void usage(void) __dead2; static u_int get_pageins(void); static int dohalt; int main(int argc, char *argv[]) { struct utmpx utx; const struct passwd *pw; int ch, howto, i, fd, lflag, nflag, qflag, sverrno, Nflag; u_int pageins; const char *user, *kernel = NULL; if (strstr(getprogname(), "halt") != NULL) { dohalt = 1; howto = RB_HALT; } else howto = 0; lflag = nflag = qflag = Nflag = 0; while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1) switch(ch) { case 'c': howto |= RB_POWERCYCLE; break; case 'd': howto |= RB_DUMP; break; case 'k': kernel = optarg; break; case 'l': lflag = 1; break; case 'n': nflag = 1; howto |= RB_NOSYNC; break; case 'N': nflag = 1; Nflag = 1; break; case 'p': howto |= RB_POWEROFF; break; case 'q': qflag = 1; break; case 'r': howto |= RB_REROOT; break; case '?': default: usage(); } argc -= optind; argv += optind; if (argc != 0) usage(); if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) errx(1, "cannot dump (-d) when halting; must reboot instead"); if (Nflag && (howto & RB_NOSYNC) != 0) errx(1, "-N cannot be used with -n"); if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE)) errx(1, "-c and -p cannot be used together"); if ((howto & RB_REROOT) != 0 && howto != RB_REROOT) errx(1, "-r cannot be used with -c, -d, -n, or -p"); if (geteuid()) { errno = EPERM; err(1, NULL); } if (qflag) { reboot(howto); err(1, NULL); } if (kernel != NULL) { fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC, 0444); if (fd > -1) { (void)write(fd, "nextboot_enable=\"YES\"\n", 22); (void)write(fd, "kernel=\"", 8L); (void)write(fd, kernel, strlen(kernel)); (void)write(fd, "\"\n", 2); close(fd); } } /* 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 if (howto & RB_REROOT) { openlog("reroot", 0, LOG_AUTH | LOG_CONS); syslog(LOG_CRIT, "rerooted by %s", user); } else if (howto & RB_POWEROFF) { openlog("reboot", 0, LOG_AUTH | LOG_CONS); syslog(LOG_CRIT, "powered off by %s", user); } else if (howto & RB_POWERCYCLE) { openlog("reboot", 0, LOG_AUTH | LOG_CONS); syslog(LOG_CRIT, "power cycled by %s", user); } else { openlog("reboot", 0, LOG_AUTH | LOG_CONS); syslog(LOG_CRIT, "rebooted by %s", user); } } utx.ut_type = SHUTDOWN_TIME; gettimeofday(&utx.ut_tv, NULL); pututxline(&utx); /* * 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); /* * Only init(8) can perform rerooting. */ if (howto & RB_REROOT) { if (kill(1, SIGEMT) == -1) err(1, "SIGEMT init"); return (0); } /* Just stop init -- if we fail, we'll restart it. */ BOOTTRACE("SIGTSTP to init(8)..."); if (kill(1, SIGTSTP) == -1) err(1, "SIGTSTP init"); /* Send a SIGTERM first, a chance to save the buffers. */ BOOTTRACE("SIGTERM to all other processes..."); if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 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. If there is a lot of * paging activity then wait longer, up to a maximum of approx * 60 seconds. */ sleep(2); for (i = 0; i < 20; i++) { pageins = get_pageins(); if (!nflag) sync(); sleep(3); if (get_pageins() == pageins) break; } for (i = 1;; ++i) { BOOTTRACE("SIGKILL to all other processes(%d)...", 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: BOOTTRACE("SIGHUP to init(8)..."); sverrno = errno; errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", strerror(sverrno)); /* NOTREACHED */ } static void usage(void) { (void)fprintf(stderr, dohalt ? "usage: halt [-clNnpq] [-k kernel]\n" : "usage: reboot [-cdlNnpqr] [-k kernel]\n"); exit(1); } static u_int get_pageins(void) { u_int pageins; size_t len; len = sizeof(pageins); if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) != 0) { warnx("v_swappgsin"); return (0); } return pageins; }