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