1 /* $NetBSD: reboot.c,v 1.38 2011/02/16 19:32:26 wiz 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 1.38 2011/02/16 19:32:26 wiz 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, "dlnpqvxz")) != -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 'v': 109 howto |= AB_VERBOSE; 110 break; 111 case 'x': 112 howto |= AB_DEBUG; 113 break; 114 case 'z': 115 howto |= AB_SILENT; 116 break; 117 case '?': 118 default: 119 usage(); 120 } 121 argc -= optind; 122 argv += optind; 123 124 if (argc) { 125 for (av = argv, len = 0; *av; av++) 126 len += strlen(*av) + 1; 127 bootstr = malloc(len + 1); 128 *bootstr = '\0'; /* for first strcat */ 129 for (av = argv; *av; av++) { 130 strcat(bootstr, *av); 131 strcat(bootstr, " "); 132 } 133 bootstr[len - 1] = '\0'; /* to kill last space */ 134 howto |= RB_STRING; 135 } else 136 bootstr = NULL; 137 138 if (geteuid()) 139 errx(1, "%s", strerror(EPERM)); 140 141 if (qflag) { 142 reboot(howto, bootstr); 143 err(1, "reboot"); 144 } 145 146 /* Log the reboot. */ 147 if (!lflag) { 148 if ((user = getlogin()) == NULL) 149 user = (pw = getpwuid(getuid())) ? 150 pw->pw_name : "???"; 151 if (dohalt) { 152 openlog("halt", LOG_CONS, LOG_AUTH); 153 syslog(LOG_CRIT, "halted by %s", user); 154 } else if (dopoweroff) { 155 openlog("poweroff", LOG_CONS, LOG_AUTH); 156 syslog(LOG_CRIT, "powered off by %s", user); 157 } else { 158 openlog("reboot", LOG_CONS, LOG_AUTH); 159 if (bootstr) 160 syslog(LOG_CRIT, "rebooted by %s: %s", user, 161 bootstr); 162 else 163 syslog(LOG_CRIT, "rebooted by %s", user); 164 } 165 } 166 #ifdef SUPPORT_UTMP 167 logwtmp("~", "shutdown", ""); 168 #endif 169 #ifdef SUPPORT_UTMPX 170 logwtmpx("~", "shutdown", "", INIT_PROCESS, 0); 171 #endif 172 173 /* 174 * Do a sync early on, so disks start transfers while we're off 175 * killing processes. Don't worry about writes done before the 176 * processes die, the reboot system call syncs the disks. 177 */ 178 if (!nflag) 179 sync(); 180 181 /* 182 * Ignore signals that we can get as a result of killing 183 * parents, group leaders, etc. 184 */ 185 (void)signal(SIGHUP, SIG_IGN); 186 (void)signal(SIGINT, SIG_IGN); 187 (void)signal(SIGQUIT, SIG_IGN); 188 (void)signal(SIGTERM, SIG_IGN); 189 (void)signal(SIGTSTP, SIG_IGN); 190 191 /* 192 * If we're running in a pipeline, we don't want to die 193 * after killing whatever we're writing to. 194 */ 195 (void)signal(SIGPIPE, SIG_IGN); 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) { 203 /* 204 * If ESRCH, everything's OK: we're the only non-system 205 * process! That can happen e.g. via 'exec reboot' in 206 * single-user mode. 207 */ 208 if (errno != ESRCH) { 209 warn("SIGTERM all processes"); 210 goto restart; 211 } 212 } 213 214 /* 215 * After the processes receive the signal, start the rest of the 216 * buffers on their way. Wait 5 seconds between the SIGTERM and 217 * the SIGKILL to pretend to give everybody a chance. 218 */ 219 sleep(2); 220 if (!nflag) 221 sync(); 222 sleep(3); 223 224 for (i = 1;; ++i) { 225 if (kill(-1, SIGKILL) == -1) { 226 if (errno == ESRCH) 227 break; 228 warn("SIGKILL all processes"); 229 goto restart; 230 } 231 if (i > 5) { 232 warnx("WARNING: some process(es) wouldn't die"); 233 break; 234 } 235 (void)sleep(2 * i); 236 } 237 238 reboot(howto, bootstr); 239 warn("reboot()"); 240 /* FALLTHROUGH */ 241 242 restart: 243 sverrno = errno; 244 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 245 strerror(sverrno)); 246 /* NOTREACHED */ 247 } 248 249 void 250 usage(void) 251 { 252 const char *pflag = dohalt ? "p" : ""; 253 254 (void)fprintf(stderr, "usage: %s [-dln%sqvxz] [-- <boot string>]\n", 255 getprogname(), pflag); 256 exit(1); 257 } 258