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; 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 = 0; 80 while ((ch = getopt(argc, argv, "dk:lnpq")) != -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 'p': 96 howto |= RB_POWEROFF; 97 break; 98 case 'q': 99 qflag = 1; 100 break; 101 case '?': 102 default: 103 usage(); 104 } 105 argc -= optind; 106 argv += optind; 107 108 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 109 errx(1, "cannot dump (-d) when halting; must reboot instead"); 110 if (geteuid()) { 111 errno = EPERM; 112 err(1, NULL); 113 } 114 115 if (qflag) { 116 reboot(howto); 117 err(1, NULL); 118 } 119 120 if (kernel != NULL) { 121 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC, 122 0444); 123 if (fd > -1) { 124 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 125 (void)write(fd, "kernel=\"", 8L); 126 (void)write(fd, kernel, strlen(kernel)); 127 (void)write(fd, "\"\n", 2); 128 close(fd); 129 } 130 } 131 132 /* Log the reboot. */ 133 if (!lflag) { 134 if ((user = getlogin()) == NULL) 135 user = (pw = getpwuid(getuid())) ? 136 pw->pw_name : "???"; 137 if (dohalt) { 138 openlog("halt", 0, LOG_AUTH | LOG_CONS); 139 syslog(LOG_CRIT, "halted by %s", user); 140 } else { 141 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 142 syslog(LOG_CRIT, "rebooted by %s", user); 143 } 144 } 145 utx.ut_type = SHUTDOWN_TIME; 146 gettimeofday(&utx.ut_tv, NULL); 147 pututxline(&utx); 148 149 /* 150 * Do a sync early on, so disks start transfers while we're off 151 * killing processes. Don't worry about writes done before the 152 * processes die, the reboot system call syncs the disks. 153 */ 154 if (!nflag) 155 sync(); 156 157 /* 158 * Ignore signals that we can get as a result of killing 159 * parents, group leaders, etc. 160 */ 161 (void)signal(SIGHUP, SIG_IGN); 162 (void)signal(SIGINT, SIG_IGN); 163 (void)signal(SIGQUIT, SIG_IGN); 164 (void)signal(SIGTERM, SIG_IGN); 165 (void)signal(SIGTSTP, SIG_IGN); 166 167 /* 168 * If we're running in a pipeline, we don't want to die 169 * after killing whatever we're writing to. 170 */ 171 (void)signal(SIGPIPE, SIG_IGN); 172 173 /* Just stop init -- if we fail, we'll restart it. */ 174 if (kill(1, SIGTSTP) == -1) 175 err(1, "SIGTSTP init"); 176 177 /* Send a SIGTERM first, a chance to save the buffers. */ 178 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 179 err(1, "SIGTERM processes"); 180 181 /* 182 * After the processes receive the signal, start the rest of the 183 * buffers on their way. Wait 5 seconds between the SIGTERM and 184 * the SIGKILL to give everybody a chance. If there is a lot of 185 * paging activity then wait longer, up to a maximum of approx 186 * 60 seconds. 187 */ 188 sleep(2); 189 for (i = 0; i < 20; i++) { 190 pageins = get_pageins(); 191 if (!nflag) 192 sync(); 193 sleep(3); 194 if (get_pageins() == pageins) 195 break; 196 } 197 198 for (i = 1;; ++i) { 199 if (kill(-1, SIGKILL) == -1) { 200 if (errno == ESRCH) 201 break; 202 goto restart; 203 } 204 if (i > 5) { 205 (void)fprintf(stderr, 206 "WARNING: some process(es) wouldn't die\n"); 207 break; 208 } 209 (void)sleep(2 * i); 210 } 211 212 reboot(howto); 213 /* FALLTHROUGH */ 214 215 restart: 216 sverrno = errno; 217 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 218 strerror(sverrno)); 219 /* NOTREACHED */ 220 } 221 222 static void 223 usage(void) 224 { 225 226 (void)fprintf(stderr, dohalt ? 227 "usage: halt [-lnpq] [-k kernel]\n" : 228 "usage: reboot [-dlnpq] [-k kernel]\n"); 229 exit(1); 230 } 231 232 static u_int 233 get_pageins(void) 234 { 235 u_int pageins; 236 size_t len; 237 238 len = sizeof(pageins); 239 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 240 != 0) { 241 warnx("v_swappgsin"); 242 return (0); 243 } 244 return pageins; 245 } 246