1 /* $NetBSD: reboot.c,v 1.41 2019/08/08 21:14:12 roy 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 1.41 2019/08/08 21:14:12 roy 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 #ifdef SUPPORT_UTMPX 60 #include <utmpx.h> 61 #endif 62 63 __dead static void usage(void); 64 65 static int dohalt; 66 static int dopoweroff; 67 68 int 69 main(int argc, char *argv[]) 70 { 71 const char *progname; 72 int i; 73 struct passwd *pw; 74 int ch, howto, lflag, nflag, qflag, sverrno, len; 75 const char *user; 76 char *bootstr, **av; 77 78 progname = getprogname(); 79 if (progname[0] == '-') 80 progname++; 81 if (strcmp(progname, "halt") == 0) { 82 dohalt = 1; 83 howto = RB_HALT; 84 } else if (strcmp(progname, "poweroff") == 0) { 85 dopoweroff = 1; 86 howto = RB_HALT | RB_POWERDOWN; 87 } else 88 howto = 0; 89 lflag = nflag = qflag = 0; 90 while ((ch = getopt(argc, argv, "dlnpqvxz")) != -1) 91 switch(ch) { 92 case 'd': 93 howto |= RB_DUMP; 94 break; 95 case 'l': 96 lflag = 1; 97 break; 98 case 'n': 99 nflag = 1; 100 howto |= RB_NOSYNC; 101 break; 102 case 'p': 103 if (dohalt == 0) 104 usage(); 105 howto |= RB_POWERDOWN; 106 break; 107 case 'q': 108 qflag = 1; 109 break; 110 case 'v': 111 howto |= AB_VERBOSE; 112 break; 113 case 'x': 114 howto |= AB_DEBUG; 115 break; 116 case 'z': 117 howto |= AB_SILENT; 118 break; 119 case '?': 120 default: 121 usage(); 122 } 123 argc -= optind; 124 argv += optind; 125 126 if (argc) { 127 for (av = argv, len = 0; *av; av++) 128 len += strlen(*av) + 1; 129 bootstr = malloc(len + 1); 130 *bootstr = '\0'; /* for first strcat */ 131 for (av = argv; *av; av++) { 132 strcat(bootstr, *av); 133 strcat(bootstr, " "); 134 } 135 bootstr[len - 1] = '\0'; /* to kill last space */ 136 howto |= RB_STRING; 137 } else 138 bootstr = NULL; 139 140 if (geteuid()) 141 errx(1, "%s", strerror(EPERM)); 142 143 if (qflag) { 144 reboot(howto, bootstr); 145 err(1, "reboot"); 146 } 147 148 /* Log the reboot. */ 149 if (!lflag) { 150 if ((user = getlogin()) == NULL) 151 user = (pw = getpwuid(getuid())) ? 152 pw->pw_name : "???"; 153 if (dohalt) { 154 openlog("halt", LOG_CONS, LOG_AUTH); 155 syslog(LOG_CRIT, "halted by %s", user); 156 } else if (dopoweroff) { 157 openlog("poweroff", LOG_CONS, LOG_AUTH); 158 syslog(LOG_CRIT, "powered off by %s", user); 159 } else { 160 openlog("reboot", LOG_CONS, LOG_AUTH); 161 if (bootstr) 162 syslog(LOG_CRIT, "rebooted by %s: %s", user, 163 bootstr); 164 else 165 syslog(LOG_CRIT, "rebooted by %s", user); 166 } 167 } 168 #ifdef SUPPORT_UTMP 169 logwtmp("~", "shutdown", ""); 170 #endif 171 #ifdef SUPPORT_UTMPX 172 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS); 173 #endif 174 175 /* 176 * Do a sync early on, so disks start transfers while we're off 177 * killing processes. Don't worry about writes done before the 178 * processes die, the reboot system call syncs the disks. 179 */ 180 if (!nflag) 181 sync(); 182 183 /* 184 * Ignore signals that we can get as a result of killing 185 * parents, group leaders, etc. 186 */ 187 (void)signal(SIGHUP, SIG_IGN); 188 (void)signal(SIGINT, SIG_IGN); 189 (void)signal(SIGQUIT, SIG_IGN); 190 (void)signal(SIGTERM, SIG_IGN); 191 (void)signal(SIGTSTP, SIG_IGN); 192 193 /* 194 * If we're running in a pipeline, we don't want to die 195 * after killing whatever we're writing to. 196 */ 197 (void)signal(SIGPIPE, SIG_IGN); 198 199 /* Just stop init -- if we fail, we'll restart it. */ 200 if (kill(1, SIGTSTP) == -1) 201 err(1, "SIGTSTP init"); 202 203 /* Send a SIGTERM first, a chance to save the buffers. */ 204 if (kill(-1, SIGTERM) == -1) { 205 /* 206 * If ESRCH, everything's OK: we're the only non-system 207 * process! That can happen e.g. via 'exec reboot' in 208 * single-user mode. 209 */ 210 if (errno != ESRCH) { 211 warn("SIGTERM all processes"); 212 goto restart; 213 } 214 } 215 216 /* 217 * After the processes receive the signal, start the rest of the 218 * buffers on their way. Wait 5 seconds between the SIGTERM and 219 * the SIGKILL to pretend to give everybody a chance. 220 */ 221 sleep(2); 222 if (!nflag) 223 sync(); 224 sleep(3); 225 226 for (i = 1;; ++i) { 227 if (kill(-1, SIGKILL) == -1) { 228 if (errno == ESRCH) 229 break; 230 warn("SIGKILL all processes"); 231 goto restart; 232 } 233 if (i > 5) { 234 warnx("WARNING: some process(es) wouldn't die"); 235 break; 236 } 237 (void)sleep(2 * i); 238 } 239 240 reboot(howto, bootstr); 241 warn("reboot()"); 242 /* FALLTHROUGH */ 243 244 restart: 245 sverrno = errno; 246 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 247 strerror(sverrno)); 248 /* NOTREACHED */ 249 } 250 251 static void 252 usage(void) 253 { 254 const char *pflag = dohalt ? "p" : ""; 255 256 (void)fprintf(stderr, "usage: %s [-dln%sqvxz] [-- <boot string>]\n", 257 getprogname(), pflag); 258 exit(1); 259 } 260
Indexes created Sun Sep 21 15:09:59 GMT 2025