1 /* 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1980, 1986, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 42 #endif /* not lint */ 43 44 #include <sys/reboot.h> 45 #include <signal.h> 46 #include <pwd.h> 47 #include <errno.h> 48 #include <syslog.h> 49 #include <unistd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 54 void err __P((const char *fmt, ...)); 55 void usage __P((void)); 56 57 int dohalt; 58 59 int 60 main(argc, argv) 61 int argc; 62 char *argv[]; 63 { 64 register int i; 65 struct passwd *pw; 66 int ch, howto, lflag, nflag, qflag, sverrno; 67 char *p, *user; 68 69 if (!strcmp((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) { 70 dohalt = 1; 71 howto = RB_HALT; 72 } else 73 howto = 0; 74 lflag = nflag = qflag = 0; 75 while ((ch = getopt(argc, argv, "lnq")) != EOF) 76 switch(ch) { 77 case 'l': /* Undocumented; used by shutdown. */ 78 lflag = 1; 79 break; 80 case 'n': 81 nflag = 1; 82 howto |= RB_NOSYNC; 83 break; 84 case 'q': 85 qflag = 1; 86 break; 87 case '?': 88 default: 89 usage(); 90 } 91 argc -= optind; 92 argv += optind; 93 94 if (geteuid()) 95 err("%s", strerror(EPERM)); 96 97 if (qflag) { 98 reboot(howto); 99 err("%s", strerror(errno)); 100 } 101 102 /* Log the reboot. */ 103 if (!lflag) { 104 if ((user = getlogin()) == NULL) 105 user = (pw = getpwuid(getuid())) ? 106 pw->pw_name : "???"; 107 if (dohalt) { 108 openlog("halt", 0, LOG_AUTH | LOG_CONS); 109 syslog(LOG_CRIT, "halted by %s", user); 110 } else { 111 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 112 syslog(LOG_CRIT, "rebooted by %s", user); 113 } 114 } 115 logwtmp("~", "shutdown", ""); 116 117 /* 118 * Do a sync early on, so disks start transfers while we're off 119 * killing processes. Don't worry about writes done before the 120 * processes die, the reboot system call syncs the disks. 121 */ 122 if (!nflag) 123 sync(); 124 125 /* Just stop init -- if we fail, we'll restart it. */ 126 if (kill(1, SIGTSTP) == -1) 127 err("SIGTSTP init: %s", strerror(errno)); 128 129 /* Ignore the SIGHUP we get when our parent shell dies. */ 130 (void)signal(SIGHUP, SIG_IGN); 131 132 /* Send a SIGTERM first, a chance to save the buffers. */ 133 if (kill(-1, SIGTERM) == -1) 134 err("SIGTERM processes: %s", strerror(errno)); 135 136 /* 137 * After the processes receive the signal, start the rest of the 138 * buffers on their way. Wait 5 seconds between the SIGTERM and 139 * the SIGKILL to give everybody a chance. 140 */ 141 sleep(2); 142 if (!nflag) 143 sync(); 144 sleep(3); 145 146 for (i = 1;; ++i) { 147 if (kill(-1, SIGKILL) == -1) { 148 if (errno == ESRCH) 149 break; 150 goto restart; 151 } 152 if (i > 5) { 153 (void)fprintf(stderr, 154 "WARNING: some process(es) wouldn't die\n"); 155 break; 156 } 157 (void)sleep(2 * i); 158 } 159 160 reboot(howto); 161 /* FALLTHROUGH */ 162 163 restart: 164 sverrno = errno; 165 err("%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 166 strerror(sverrno)); 167 /* NOTREACHED */ 168 } 169 170 void 171 usage() 172 { 173 (void)fprintf(stderr, "usage: %s [-nq]\n", dohalt ? "halt" : "reboot"); 174 exit(1); 175 } 176 177 #if __STDC__ 178 #include <stdarg.h> 179 #else 180 #include <varargs.h> 181 #endif 182 183 void 184 #if __STDC__ 185 err(const char *fmt, ...) 186 #else 187 err(fmt, va_alist) 188 char *fmt; 189 va_dcl 190 #endif 191 { 192 va_list ap; 193 #if __STDC__ 194 va_start(ap, fmt); 195 #else 196 va_start(ap); 197 #endif 198 (void)fprintf(stderr, "%s: ", dohalt ? "halt" : "reboot"); 199 (void)vfprintf(stderr, fmt, ap); 200 va_end(ap); 201 (void)fprintf(stderr, "\n"); 202 exit(1); 203 /* NOTREACHED */ 204 } 205