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/types.h> 47 #include <sys/boottrace.h> 48 #include <sys/reboot.h> 49 #include <sys/sysctl.h> 50 #include <sys/time.h> 51 52 #include <signal.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <pwd.h> 57 #include <syslog.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 #include <utmpx.h> 63 64 static void usage(void) __dead2; 65 static u_int get_pageins(void); 66 67 static int dohalt; 68 69 int 70 main(int argc, char *argv[]) 71 { 72 struct utmpx utx; 73 const struct passwd *pw; 74 int ch, howto, i, fd, lflag, nflag, qflag, sverrno, Nflag; 75 u_int pageins; 76 const char *user, *kernel = NULL; 77 78 if (strstr(getprogname(), "halt") != NULL) { 79 dohalt = 1; 80 howto = RB_HALT; 81 } else 82 howto = 0; 83 lflag = nflag = qflag = Nflag = 0; 84 while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1) 85 switch(ch) { 86 case 'c': 87 howto |= RB_POWERCYCLE; 88 break; 89 case 'd': 90 howto |= RB_DUMP; 91 break; 92 case 'k': 93 kernel = optarg; 94 break; 95 case 'l': 96 lflag = 1; 97 break; 98 case 'n': 99 nflag = 1; 100 howto |= RB_NOSYNC; 101 break; 102 case 'N': 103 nflag = 1; 104 Nflag = 1; 105 break; 106 case 'p': 107 howto |= RB_POWEROFF; 108 break; 109 case 'q': 110 qflag = 1; 111 break; 112 case 'r': 113 howto |= RB_REROOT; 114 break; 115 case '?': 116 default: 117 usage(); 118 } 119 argc -= optind; 120 argv += optind; 121 if (argc != 0) 122 usage(); 123 124 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 125 errx(1, "cannot dump (-d) when halting; must reboot instead"); 126 if (Nflag && (howto & RB_NOSYNC) != 0) 127 errx(1, "-N cannot be used with -n"); 128 if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE)) 129 errx(1, "-c and -p cannot be used together"); 130 if ((howto & RB_REROOT) != 0 && howto != RB_REROOT) 131 errx(1, "-r cannot be used with -c, -d, -n, or -p"); 132 if (geteuid()) { 133 errno = EPERM; 134 err(1, NULL); 135 } 136 137 if (qflag) { 138 reboot(howto); 139 err(1, NULL); 140 } 141 142 if (kernel != NULL) { 143 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC, 144 0444); 145 if (fd > -1) { 146 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 147 (void)write(fd, "kernel=\"", 8L); 148 (void)write(fd, kernel, strlen(kernel)); 149 (void)write(fd, "\"\n", 2); 150 close(fd); 151 } 152 } 153 154 /* Log the reboot. */ 155 if (!lflag) { 156 if ((user = getlogin()) == NULL) 157 user = (pw = getpwuid(getuid())) ? 158 pw->pw_name : "???"; 159 if (dohalt) { 160 openlog("halt", 0, LOG_AUTH | LOG_CONS); 161 syslog(LOG_CRIT, "halted by %s", user); 162 } else if (howto & RB_REROOT) { 163 openlog("reroot", 0, LOG_AUTH | LOG_CONS); 164 syslog(LOG_CRIT, "rerooted by %s", user); 165 } else if (howto & RB_POWEROFF) { 166 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 167 syslog(LOG_CRIT, "powered off by %s", user); 168 } else if (howto & RB_POWERCYCLE) { 169 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 170 syslog(LOG_CRIT, "power cycled by %s", user); 171 } else { 172 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 173 syslog(LOG_CRIT, "rebooted by %s", user); 174 } 175 } 176 utx.ut_type = SHUTDOWN_TIME; 177 gettimeofday(&utx.ut_tv, NULL); 178 pututxline(&utx); 179 180 /* 181 * Do a sync early on, so disks start transfers while we're off 182 * killing processes. Don't worry about writes done before the 183 * processes die, the reboot system call syncs the disks. 184 */ 185 if (!nflag) 186 sync(); 187 188 /* 189 * Ignore signals that we can get as a result of killing 190 * parents, group leaders, etc. 191 */ 192 (void)signal(SIGHUP, SIG_IGN); 193 (void)signal(SIGINT, SIG_IGN); 194 (void)signal(SIGQUIT, SIG_IGN); 195 (void)signal(SIGTERM, SIG_IGN); 196 (void)signal(SIGTSTP, SIG_IGN); 197 198 /* 199 * If we're running in a pipeline, we don't want to die 200 * after killing whatever we're writing to. 201 */ 202 (void)signal(SIGPIPE, SIG_IGN); 203 204 /* 205 * Only init(8) can perform rerooting. 206 */ 207 if (howto & RB_REROOT) { 208 if (kill(1, SIGEMT) == -1) 209 err(1, "SIGEMT init"); 210 211 return (0); 212 } 213 214 /* Just stop init -- if we fail, we'll restart it. */ 215 BOOTTRACE("SIGTSTP to init(8)..."); 216 if (kill(1, SIGTSTP) == -1) 217 err(1, "SIGTSTP init"); 218 219 /* Send a SIGTERM first, a chance to save the buffers. */ 220 BOOTTRACE("SIGTERM to all other processes..."); 221 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 222 err(1, "SIGTERM processes"); 223 224 /* 225 * After the processes receive the signal, start the rest of the 226 * buffers on their way. Wait 5 seconds between the SIGTERM and 227 * the SIGKILL to give everybody a chance. If there is a lot of 228 * paging activity then wait longer, up to a maximum of approx 229 * 60 seconds. 230 */ 231 sleep(2); 232 for (i = 0; i < 20; i++) { 233 pageins = get_pageins(); 234 if (!nflag) 235 sync(); 236 sleep(3); 237 if (get_pageins() == pageins) 238 break; 239 } 240 241 for (i = 1;; ++i) { 242 BOOTTRACE("SIGKILL to all other processes(%d)...", i); 243 if (kill(-1, SIGKILL) == -1) { 244 if (errno == ESRCH) 245 break; 246 goto restart; 247 } 248 if (i > 5) { 249 (void)fprintf(stderr, 250 "WARNING: some process(es) wouldn't die\n"); 251 break; 252 } 253 (void)sleep(2 * i); 254 } 255 256 reboot(howto); 257 /* FALLTHROUGH */ 258 259 restart: 260 BOOTTRACE("SIGHUP to init(8)..."); 261 sverrno = errno; 262 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 263 strerror(sverrno)); 264 /* NOTREACHED */ 265 } 266 267 static void 268 usage(void) 269 { 270 271 (void)fprintf(stderr, dohalt ? 272 "usage: halt [-clNnpq] [-k kernel]\n" : 273 "usage: reboot [-cdlNnpqr] [-k kernel]\n"); 274 exit(1); 275 } 276 277 static u_int 278 get_pageins(void) 279 { 280 u_int pageins; 281 size_t len; 282 283 len = sizeof(pageins); 284 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 285 != 0) { 286 warnx("v_swappgsin"); 287 return (0); 288 } 289 return pageins; 290 } 291