1 /* $NetBSD: reboot.c,v 1.28 2001/02/19 22:56:22 cgd 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 38 #ifndef lint 39 __COPYRIGHT("@(#) Copyright (c) 1980, 1986, 1993\n" 40 " The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 46 #else 47 __RCSID("$NetBSD: reboot.c,v 1.28 2001/02/19 22:56:22 cgd Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 #include <sys/reboot.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <pwd.h> 56 #include <signal.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <syslog.h> 61 #include <unistd.h> 62 #include <util.h> 63 64 int main __P((int, char *[])); 65 void usage __P((void)); 66 67 int dohalt; 68 int dopoweroff; 69 70 int 71 main(argc, argv) 72 int argc; 73 char *argv[]; 74 { 75 const char *progname; 76 int i; 77 struct passwd *pw; 78 int ch, howto, lflag, nflag, qflag, sverrno, len; 79 const char *user; 80 char *bootstr, **av; 81 82 progname = getprogname(); 83 if (!strcmp(progname, "halt") || !strcmp(progname, "-halt")) { 84 dohalt = 1; 85 howto = RB_HALT; 86 } else if (!strcmp(progname, "poweroff") 87 || !strcmp(progname, "-poweroff")) { 88 dopoweroff = 1; 89 howto = RB_HALT | RB_POWERDOWN; 90 } else 91 howto = 0; 92 lflag = nflag = qflag = 0; 93 while ((ch = getopt(argc, argv, "dlnpq")) != -1) 94 switch(ch) { 95 case 'd': 96 howto |= RB_DUMP; 97 break; 98 case 'l': 99 lflag = 1; 100 break; 101 case 'n': 102 nflag = 1; 103 howto |= RB_NOSYNC; 104 break; 105 case 'p': 106 if (dohalt == 0) 107 usage(); 108 howto |= RB_POWERDOWN; 109 break; 110 case 'q': 111 qflag = 1; 112 break; 113 case '?': 114 default: 115 usage(); 116 } 117 argc -= optind; 118 argv += optind; 119 120 if (argc) { 121 for (av = argv, len = 0; *av; av++) 122 len += strlen(*av) + 1; 123 bootstr = malloc(len + 1); 124 *bootstr = '\0'; /* for first strcat */ 125 for (av = argv; *av; av++) { 126 strcat(bootstr, *av); 127 strcat(bootstr, " "); 128 } 129 bootstr[len] = '\0'; /* to kill last space */ 130 howto |= RB_STRING; 131 } else 132 bootstr = NULL; 133 134 if (geteuid()) 135 errx(1, "%s", strerror(EPERM)); 136 137 if (qflag) { 138 reboot(howto, bootstr); 139 err(1, "reboot"); 140 } 141 142 /* Log the reboot. */ 143 if (!lflag) { 144 if ((user = getlogin()) == NULL) 145 user = (pw = getpwuid(getuid())) ? 146 pw->pw_name : "???"; 147 if (dohalt) { 148 openlog("halt", LOG_CONS, LOG_AUTH); 149 syslog(LOG_CRIT, "halted by %s", user); 150 } else if (dopoweroff) { 151 openlog("poweroff", LOG_CONS, LOG_AUTH); 152 syslog(LOG_CRIT, "powered off by %s", user); 153 } else { 154 openlog("reboot", LOG_CONS, LOG_AUTH); 155 if (bootstr) 156 syslog(LOG_CRIT, "rebooted by %s: %s", user, 157 bootstr); 158 else 159 syslog(LOG_CRIT, "rebooted by %s", user); 160 } 161 } 162 logwtmp("~", "shutdown", ""); 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 /* Just stop init -- if we fail, we'll restart it. */ 173 if (kill(1, SIGTSTP) == -1) 174 err(1, "SIGTSTP init"); 175 176 /* 177 * Ignore signals that we can get as a result of killing 178 * parents, group leaders, etc. 179 */ 180 (void)signal(SIGHUP, SIG_IGN); 181 (void)signal(SIGINT, SIG_IGN); 182 (void)signal(SIGQUIT, SIG_IGN); 183 (void)signal(SIGTERM, SIG_IGN); 184 185 /* If we're running in a pipeline, we don't want to die 186 * after killing whatever we're writing to. */ 187 (void)signal(SIGPIPE, SIG_IGN); 188 189 /* Send a SIGTERM first, a chance to save the buffers. */ 190 if (kill(-1, SIGTERM) == -1) { 191 /* 192 * If ESRCH, everything's OK: we're the only non-system 193 * process! That can happen e.g. via 'exec reboot' in 194 * single-user mode. 195 */ 196 if (errno != ESRCH) { 197 warn("SIGTERM processes"); 198 goto restart; 199 } 200 } 201 202 /* 203 * After the processes receive the signal, start the rest of the 204 * buffers on their way. Wait 5 seconds between the SIGTERM and 205 * the SIGKILL to pretend to give everybody a chance. 206 */ 207 sleep(2); 208 if (!nflag) 209 sync(); 210 sleep(3); 211 212 for (i = 1;; ++i) { 213 if (kill(-1, SIGKILL) == -1) { 214 if (errno == ESRCH) 215 break; 216 goto restart; 217 } 218 if (i > 5) { 219 warnx("WARNING: some process(es) wouldn't die"); 220 break; 221 } 222 (void)sleep(2 * i); 223 } 224 225 reboot(howto, bootstr); 226 /* FALLTHROUGH */ 227 228 restart: 229 sverrno = errno; 230 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 231 strerror(sverrno)); 232 /* NOTREACHED */ 233 } 234 235 void 236 usage() 237 { 238 const char *pflag = dohalt ? "p" : ""; 239 240 (void)fprintf(stderr, "usage: %s [-dln%sq] [-- <boot string>]\n", 241 getprogname(), pflag); 242 exit(1); 243 } 244