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 const 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 #if 0 42 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/reboot.h> 49 #include <sys/types.h> 50 #include <signal.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <libutil.h> 54 #include <pwd.h> 55 #include <syslog.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 void usage __P((void)); 61 62 int dohalt; 63 64 int 65 main(argc, argv) 66 int argc; 67 char *argv[]; 68 { 69 register int i; 70 struct passwd *pw; 71 int ch, howto, lflag, nflag, qflag, pflag, sverrno; 72 char *p, *user; 73 74 if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) { 75 dohalt = 1; 76 howto = RB_HALT; 77 } else 78 howto = 0; 79 lflag = nflag = qflag = 0; 80 while ((ch = getopt(argc, argv, "dlnpq")) != -1) 81 switch(ch) { 82 case 'd': 83 howto |= RB_DUMP; 84 break; 85 case 'l': /* Undocumented; used by shutdown. */ 86 lflag = 1; 87 break; 88 case 'n': 89 nflag = 1; 90 howto |= RB_NOSYNC; 91 break; 92 case 'p': 93 pflag = 1; 94 howto |= (RB_POWEROFF | RB_HALT); 95 break; 96 case 'q': 97 qflag = 1; 98 break; 99 case '?': 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 107 errx(1, "cannot dump (-d) when halting; must reboot instead"); 108 if (geteuid()) { 109 errno = EPERM; 110 err(1, NULL); 111 } 112 113 if (qflag) { 114 reboot(howto); 115 err(1, NULL); 116 } 117 118 /* Log the reboot. */ 119 if (!lflag) { 120 if ((user = getlogin()) == NULL) 121 user = (pw = getpwuid(getuid())) ? 122 pw->pw_name : "???"; 123 if (dohalt) { 124 openlog("halt", 0, LOG_AUTH | LOG_CONS); 125 syslog(LOG_CRIT, "halted by %s", user); 126 } else { 127 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 128 syslog(LOG_CRIT, "rebooted by %s", user); 129 } 130 } 131 logwtmp("~", "shutdown", ""); 132 133 /* 134 * Do a sync early on, so disks start transfers while we're off 135 * killing processes. Don't worry about writes done before the 136 * processes die, the reboot system call syncs the disks. 137 */ 138 if (!nflag) 139 sync(); 140 141 /* Just stop init -- if we fail, we'll restart it. */ 142 if (kill(1, SIGTSTP) == -1) 143 err(1, "SIGTSTP init"); 144 145 /* Ignore the SIGHUP we get when our parent shell dies. */ 146 (void)signal(SIGHUP, SIG_IGN); 147 148 /* Send a SIGTERM first, a chance to save the buffers. */ 149 if (kill(-1, SIGTERM) == -1) 150 err(1, "SIGTERM processes"); 151 152 /* 153 * After the processes receive the signal, start the rest of the 154 * buffers on their way. Wait 5 seconds between the SIGTERM and 155 * the SIGKILL to give everybody a chance. 156 */ 157 sleep(2); 158 if (!nflag) 159 sync(); 160 sleep(3); 161 162 for (i = 1;; ++i) { 163 if (kill(-1, SIGKILL) == -1) { 164 if (errno == ESRCH) 165 break; 166 goto restart; 167 } 168 if (i > 5) { 169 (void)fprintf(stderr, 170 "WARNING: some process(es) wouldn't die\n"); 171 break; 172 } 173 (void)sleep(2 * i); 174 } 175 176 reboot(howto); 177 /* FALLTHROUGH */ 178 179 restart: 180 sverrno = errno; 181 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 182 strerror(sverrno)); 183 /* NOTREACHED */ 184 } 185 186 void 187 usage() 188 { 189 (void)fprintf(stderr, "usage: %s [-dnpq]\n", 190 dohalt ? "halt" : "reboot"); 191 exit(1); 192 } 193