1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1980, 1986, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 41 #endif /* not lint */ 42 #endif 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/reboot.h> 47 #include <sys/time.h> 48 #include <sys/types.h> 49 #include <sys/sysctl.h> 50 #include <signal.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <pwd.h> 55 #include <syslog.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <utmpx.h> 61 62 static void usage(void); 63 static u_int get_pageins(void); 64 65 static int dohalt; 66 67 int 68 main(int argc, char *argv[]) 69 { 70 struct utmpx utx; 71 const struct passwd *pw; 72 int ch, howto, i, fd, lflag, nflag, qflag, sverrno, Nflag; 73 u_int pageins; 74 const char *user, *kernel = NULL; 75 76 if (strcmp(getprogname(), "halt") == 0) { 77 dohalt = 1; 78 howto = RB_HALT; 79 } else 80 howto = 0; 81 lflag = nflag = qflag = Nflag = 0; 82 while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1) 83 switch(ch) { 84 case 'c': 85 howto |= RB_POWERCYCLE; 86 break; 87 case 'd': 88 howto |= RB_DUMP; 89 break; 90 case 'k': 91 kernel = optarg; 92 break; 93 case 'l': 94 lflag = 1; 95 break; 96 case 'n': 97 nflag = 1; 98 howto |= RB_NOSYNC; 99 break; 100 case 'N': 101 nflag = 1; 102 Nflag = 1; 103 break; 104 case 'p': 105 howto |= RB_POWEROFF; 106 break; 107 case 'q': 108 qflag = 1; 109 break; 110 case 'r': 111 howto |= RB_REROOT; 112 break; 113 case '?': 114 default: 115 usage(); 116 } 117 argc -= optind; 118 argv += optind; 119 120 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 121 errx(1, "cannot dump (-d) when halting; must reboot instead"); 122 if (Nflag && (howto & RB_NOSYNC) != 0) 123 errx(1, "-N cannot be used with -n"); 124 if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE)) 125 errx(1, "-c and -p cannot be used together"); 126 if ((howto & RB_REROOT) != 0 && howto != RB_REROOT) 127 errx(1, "-r cannot be used with -c, -d, -n, or -p"); 128 if (geteuid()) { 129 errno = EPERM; 130 err(1, NULL); 131 } 132 133 if (qflag) { 134 reboot(howto); 135 err(1, NULL); 136 } 137 138 if (kernel != NULL) { 139 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC, 140 0444); 141 if (fd > -1) { 142 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 143 (void)write(fd, "kernel=\"", 8L); 144 (void)write(fd, kernel, strlen(kernel)); 145 (void)write(fd, "\"\n", 2); 146 close(fd); 147 } 148 } 149 150 /* Log the reboot. */ 151 if (!lflag) { 152 if ((user = getlogin()) == NULL) 153 user = (pw = getpwuid(getuid())) ? 154 pw->pw_name : "???"; 155 if (dohalt) { 156 openlog("halt", 0, LOG_AUTH | LOG_CONS); 157 syslog(LOG_CRIT, "halted by %s", user); 158 } else if (howto & RB_REROOT) { 159 openlog("reroot", 0, LOG_AUTH | LOG_CONS); 160 syslog(LOG_CRIT, "rerooted by %s", user); 161 } else if (howto & RB_POWEROFF) { 162 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 163 syslog(LOG_CRIT, "powered off by %s", user); 164 } else if (howto & RB_POWERCYCLE) { 165 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 166 syslog(LOG_CRIT, "power cycled by %s", user); 167 } else { 168 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 169 syslog(LOG_CRIT, "rebooted by %s", user); 170 } 171 } 172 utx.ut_type = SHUTDOWN_TIME; 173 gettimeofday(&utx.ut_tv, NULL); 174 pututxline(&utx); 175 176 /* 177 * Do a sync early on, so disks start transfers while we're off 178 * killing processes. Don't worry about writes done before the 179 * processes die, the reboot system call syncs the disks. 180 */ 181 if (!nflag) 182 sync(); 183 184 /* 185 * Ignore signals that we can get as a result of killing 186 * parents, group leaders, etc. 187 */ 188 (void)signal(SIGHUP, SIG_IGN); 189 (void)signal(SIGINT, SIG_IGN); 190 (void)signal(SIGQUIT, SIG_IGN); 191 (void)signal(SIGTERM, SIG_IGN); 192 (void)signal(SIGTSTP, SIG_IGN); 193 194 /* 195 * If we're running in a pipeline, we don't want to die 196 * after killing whatever we're writing to. 197 */ 198 (void)signal(SIGPIPE, SIG_IGN); 199 200 /* 201 * Only init(8) can perform rerooting. 202 */ 203 if (howto & RB_REROOT) { 204 if (kill(1, SIGEMT) == -1) 205 err(1, "SIGEMT init"); 206 207 return (0); 208 } 209 210 /* Just stop init -- if we fail, we'll restart it. */ 211 if (kill(1, SIGTSTP) == -1) 212 err(1, "SIGTSTP init"); 213 214 /* Send a SIGTERM first, a chance to save the buffers. */ 215 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 216 err(1, "SIGTERM processes"); 217 218 /* 219 * After the processes receive the signal, start the rest of the 220 * buffers on their way. Wait 5 seconds between the SIGTERM and 221 * the SIGKILL to give everybody a chance. If there is a lot of 222 * paging activity then wait longer, up to a maximum of approx 223 * 60 seconds. 224 */ 225 sleep(2); 226 for (i = 0; i < 20; i++) { 227 pageins = get_pageins(); 228 if (!nflag) 229 sync(); 230 sleep(3); 231 if (get_pageins() == pageins) 232 break; 233 } 234 235 for (i = 1;; ++i) { 236 if (kill(-1, SIGKILL) == -1) { 237 if (errno == ESRCH) 238 break; 239 goto restart; 240 } 241 if (i > 5) { 242 (void)fprintf(stderr, 243 "WARNING: some process(es) wouldn't die\n"); 244 break; 245 } 246 (void)sleep(2 * i); 247 } 248 249 reboot(howto); 250 /* FALLTHROUGH */ 251 252 restart: 253 sverrno = errno; 254 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 255 strerror(sverrno)); 256 /* NOTREACHED */ 257 } 258 259 static void 260 usage(void) 261 { 262 263 (void)fprintf(stderr, dohalt ? 264 "usage: halt [-clNnpq] [-k kernel]\n" : 265 "usage: reboot [-cdlNnpqr] [-k kernel]\n"); 266 exit(1); 267 } 268 269 static u_int 270 get_pageins(void) 271 { 272 u_int pageins; 273 size_t len; 274 275 len = sizeof(pageins); 276 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 277 != 0) { 278 warnx("v_swappgsin"); 279 return (0); 280 } 281 return pageins; 282 } 283