1 /* $NetBSD: reboot.c,v 1.33 2003/08/07 10:04:37 agc Exp $ */ 2 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 #include <sys/cdefs.h> 33 34 #ifndef lint 35 __COPYRIGHT("@(#) 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 #if 0 41 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 42 #else 43 __RCSID("$NetBSD: reboot.c,v 1.33 2003/08/07 10:04:37 agc Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/reboot.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <pwd.h> 52 #include <signal.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <syslog.h> 57 #include <unistd.h> 58 #include <util.h> 59 60 int main(int, char *[]); 61 void usage(void); 62 63 int dohalt; 64 int dopoweroff; 65 66 int 67 main(int argc, char *argv[]) 68 { 69 const char *progname; 70 int i; 71 struct passwd *pw; 72 int ch, howto, lflag, nflag, qflag, sverrno, len; 73 const char *user; 74 char *bootstr, **av; 75 76 progname = getprogname(); 77 if (!strcmp(progname, "halt") || !strcmp(progname, "-halt")) { 78 dohalt = 1; 79 howto = RB_HALT; 80 } else if (!strcmp(progname, "poweroff") 81 || !strcmp(progname, "-poweroff")) { 82 dopoweroff = 1; 83 howto = RB_HALT | RB_POWERDOWN; 84 } else 85 howto = 0; 86 lflag = nflag = qflag = 0; 87 while ((ch = getopt(argc, argv, "dlnpq")) != -1) 88 switch(ch) { 89 case 'd': 90 howto |= RB_DUMP; 91 break; 92 case 'l': 93 lflag = 1; 94 break; 95 case 'n': 96 nflag = 1; 97 howto |= RB_NOSYNC; 98 break; 99 case 'p': 100 if (dohalt == 0) 101 usage(); 102 howto |= RB_POWERDOWN; 103 break; 104 case 'q': 105 qflag = 1; 106 break; 107 case '?': 108 default: 109 usage(); 110 } 111 argc -= optind; 112 argv += optind; 113 114 if (argc) { 115 for (av = argv, len = 0; *av; av++) 116 len += strlen(*av) + 1; 117 bootstr = malloc(len + 1); 118 *bootstr = '\0'; /* for first strcat */ 119 for (av = argv; *av; av++) { 120 strcat(bootstr, *av); 121 strcat(bootstr, " "); 122 } 123 bootstr[len - 1] = '\0'; /* to kill last space */ 124 howto |= RB_STRING; 125 } else 126 bootstr = NULL; 127 128 if (geteuid()) 129 errx(1, "%s", strerror(EPERM)); 130 131 if (qflag) { 132 reboot(howto, bootstr); 133 err(1, "reboot"); 134 } 135 136 /* Log the reboot. */ 137 if (!lflag) { 138 if ((user = getlogin()) == NULL) 139 user = (pw = getpwuid(getuid())) ? 140 pw->pw_name : "???"; 141 if (dohalt) { 142 openlog("halt", LOG_CONS, LOG_AUTH); 143 syslog(LOG_CRIT, "halted by %s", user); 144 } else if (dopoweroff) { 145 openlog("poweroff", LOG_CONS, LOG_AUTH); 146 syslog(LOG_CRIT, "powered off by %s", user); 147 } else { 148 openlog("reboot", LOG_CONS, LOG_AUTH); 149 if (bootstr) 150 syslog(LOG_CRIT, "rebooted by %s: %s", user, 151 bootstr); 152 else 153 syslog(LOG_CRIT, "rebooted by %s", user); 154 } 155 } 156 #ifdef SUPPORT_UTMP 157 logwtmp("~", "shutdown", ""); 158 #endif 159 #ifdef SUPPORT_UTMPX 160 logwtmpx("~", "shutdown", "", INIT_PROCESS, 0); 161 #endif 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 /* Just stop init -- if we fail, we'll restart it. */ 188 if (kill(1, SIGTSTP) == -1) 189 err(1, "SIGTSTP init"); 190 191 /* Send a SIGTERM first, a chance to save the buffers. */ 192 if (kill(-1, SIGTERM) == -1) { 193 /* 194 * If ESRCH, everything's OK: we're the only non-system 195 * process! That can happen e.g. via 'exec reboot' in 196 * single-user mode. 197 */ 198 if (errno != ESRCH) { 199 warn("SIGTERM processes"); 200 goto restart; 201 } 202 } 203 204 /* 205 * After the processes receive the signal, start the rest of the 206 * buffers on their way. Wait 5 seconds between the SIGTERM and 207 * the SIGKILL to pretend to give everybody a chance. 208 */ 209 sleep(2); 210 if (!nflag) 211 sync(); 212 sleep(3); 213 214 for (i = 1;; ++i) { 215 if (kill(-1, SIGKILL) == -1) { 216 if (errno == ESRCH) 217 break; 218 goto restart; 219 } 220 if (i > 5) { 221 warnx("WARNING: some process(es) wouldn't die"); 222 break; 223 } 224 (void)sleep(2 * i); 225 } 226 227 reboot(howto, bootstr); 228 /* FALLTHROUGH */ 229 230 restart: 231 sverrno = errno; 232 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 233 strerror(sverrno)); 234 /* NOTREACHED */ 235 } 236 237 void 238 usage(void) 239 { 240 const char *pflag = dohalt ? "p" : ""; 241 242 (void)fprintf(stderr, "usage: %s [-dln%sq] [-- <boot string>]\n", 243 getprogname(), pflag); 244 exit(1); 245 } 246