1 /* $NetBSD: reboot.c,v 1.36 2008/07/20 01:20:23 lukem 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\ 36 The Regents of the University of California. All rights reserved."); 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 1.36 2008/07/20 01:20:23 lukem 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 (progname[0] == '-') 78 progname++; 79 if (strcmp(progname, "halt") == 0) { 80 dohalt = 1; 81 howto = RB_HALT; 82 } else if (strcmp(progname, "poweroff") == 0) { 83 dopoweroff = 1; 84 howto = RB_HALT | RB_POWERDOWN; 85 } else 86 howto = 0; 87 lflag = nflag = qflag = 0; 88 while ((ch = getopt(argc, argv, "dlnpq")) != -1) 89 switch(ch) { 90 case 'd': 91 howto |= RB_DUMP; 92 break; 93 case 'l': 94 lflag = 1; 95 break; 96 case 'n': 97 nflag = 1; 98 howto |= RB_NOSYNC; 99 break; 100 case 'p': 101 if (dohalt == 0) 102 usage(); 103 howto |= RB_POWERDOWN; 104 break; 105 case 'q': 106 qflag = 1; 107 break; 108 case '?': 109 default: 110 usage(); 111 } 112 argc -= optind; 113 argv += optind; 114 115 if (argc) { 116 for (av = argv, len = 0; *av; av++) 117 len += strlen(*av) + 1; 118 bootstr = malloc(len + 1); 119 *bootstr = '\0'; /* for first strcat */ 120 for (av = argv; *av; av++) { 121 strcat(bootstr, *av); 122 strcat(bootstr, " "); 123 } 124 bootstr[len - 1] = '\0'; /* to kill last space */ 125 howto |= RB_STRING; 126 } else 127 bootstr = NULL; 128 129 if (geteuid()) 130 errx(1, "%s", strerror(EPERM)); 131 132 if (qflag) { 133 reboot(howto, bootstr); 134 err(1, "reboot"); 135 } 136 137 /* Log the reboot. */ 138 if (!lflag) { 139 if ((user = getlogin()) == NULL) 140 user = (pw = getpwuid(getuid())) ? 141 pw->pw_name : "???"; 142 if (dohalt) { 143 openlog("halt", LOG_CONS, LOG_AUTH); 144 syslog(LOG_CRIT, "halted by %s", user); 145 } else if (dopoweroff) { 146 openlog("poweroff", LOG_CONS, LOG_AUTH); 147 syslog(LOG_CRIT, "powered off by %s", user); 148 } else { 149 openlog("reboot", LOG_CONS, LOG_AUTH); 150 if (bootstr) 151 syslog(LOG_CRIT, "rebooted by %s: %s", user, 152 bootstr); 153 else 154 syslog(LOG_CRIT, "rebooted by %s", user); 155 } 156 } 157 #ifdef SUPPORT_UTMP 158 logwtmp("~", "shutdown", ""); 159 #endif 160 #ifdef SUPPORT_UTMPX 161 logwtmpx("~", "shutdown", "", INIT_PROCESS, 0); 162 #endif 163 164 /* 165 * Do a sync early on, so disks start transfers while we're off 166 * killing processes. Don't worry about writes done before the 167 * processes die, the reboot system call syncs the disks. 168 */ 169 if (!nflag) 170 sync(); 171 172 /* 173 * Ignore signals that we can get as a result of killing 174 * parents, group leaders, etc. 175 */ 176 (void)signal(SIGHUP, SIG_IGN); 177 (void)signal(SIGINT, SIG_IGN); 178 (void)signal(SIGQUIT, SIG_IGN); 179 (void)signal(SIGTERM, SIG_IGN); 180 (void)signal(SIGTSTP, SIG_IGN); 181 182 /* 183 * If we're running in a pipeline, we don't want to die 184 * after killing whatever we're writing to. 185 */ 186 (void)signal(SIGPIPE, SIG_IGN); 187 188 /* Just stop init -- if we fail, we'll restart it. */ 189 if (kill(1, SIGTSTP) == -1) 190 err(1, "SIGTSTP init"); 191 192 /* Send a SIGTERM first, a chance to save the buffers. */ 193 if (kill(-1, SIGTERM) == -1) { 194 /* 195 * If ESRCH, everything's OK: we're the only non-system 196 * process! That can happen e.g. via 'exec reboot' in 197 * single-user mode. 198 */ 199 if (errno != ESRCH) { 200 warn("SIGTERM all processes"); 201 goto restart; 202 } 203 } 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 pretend to give everybody a chance. 209 */ 210 sleep(2); 211 if (!nflag) 212 sync(); 213 sleep(3); 214 215 for (i = 1;; ++i) { 216 if (kill(-1, SIGKILL) == -1) { 217 if (errno == ESRCH) 218 break; 219 warn("SIGKILL all processes"); 220 goto restart; 221 } 222 if (i > 5) { 223 warnx("WARNING: some process(es) wouldn't die"); 224 break; 225 } 226 (void)sleep(2 * i); 227 } 228 229 reboot(howto, bootstr); 230 warn("reboot()"); 231 /* FALLTHROUGH */ 232 233 restart: 234 sverrno = errno; 235 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 236 strerror(sverrno)); 237 /* NOTREACHED */ 238 } 239 240 void 241 usage(void) 242 { 243 const char *pflag = dohalt ? "p" : ""; 244 245 (void)fprintf(stderr, "usage: %s [-dln%sq] [-- <boot string>]\n", 246 getprogname(), pflag); 247 exit(1); 248 } 249