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