reboot.c revision 27107
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 * $Id: reboot.c,v 1.5 1997/06/16 06:43:13 charnier Exp $ 34 */ 35 36#ifndef lint 37static char copyright[] = 38"@(#) Copyright (c) 1980, 1986, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40#endif /* not lint */ 41 42#ifndef lint 43static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 44#endif /* not lint */ 45 46#include <sys/reboot.h> 47#include <signal.h> 48#include <pwd.h> 49#include <errno.h> 50#include <syslog.h> 51#include <unistd.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <err.h> 56 57void usage __P((void)); 58 59int dohalt; 60 61int 62main(argc, argv) 63 int argc; 64 char *argv[]; 65{ 66 register int i; 67 struct passwd *pw; 68 int ch, howto, lflag, nflag, qflag, pflag, sverrno; 69 char *p, *user; 70 71 if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) { 72 dohalt = 1; 73 howto = RB_HALT; 74 } else 75 howto = 0; 76 lflag = nflag = qflag = 0; 77 while ((ch = getopt(argc, argv, "lnpq")) != -1) 78 switch(ch) { 79 case 'l': /* Undocumented; used by shutdown. */ 80 lflag = 1; 81 break; 82 case 'n': 83 nflag = 1; 84 howto |= RB_NOSYNC; 85 break; 86 case 'p': 87 pflag = 1; 88 howto |= (RB_POWEROFF | RB_HALT); 89 break; 90 case 'q': 91 qflag = 1; 92 break; 93 case '?': 94 default: 95 usage(); 96 } 97 argc -= optind; 98 argv += optind; 99 100 if (geteuid()) { 101 errno = EPERM; 102 err(1, NULL); 103 } 104 105 if (qflag) { 106 reboot(howto); 107 err(1, NULL); 108 } 109 110 /* Log the reboot. */ 111 if (!lflag) { 112 if ((user = getlogin()) == NULL) 113 user = (pw = getpwuid(getuid())) ? 114 pw->pw_name : "???"; 115 if (dohalt) { 116 openlog("halt", 0, LOG_AUTH | LOG_CONS); 117 syslog(LOG_CRIT, "halted by %s", user); 118 } else { 119 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 120 syslog(LOG_CRIT, "rebooted by %s", user); 121 } 122 } 123 logwtmp("~", "shutdown", ""); 124 125 /* 126 * Do a sync early on, so disks start transfers while we're off 127 * killing processes. Don't worry about writes done before the 128 * processes die, the reboot system call syncs the disks. 129 */ 130 if (!nflag) 131 sync(); 132 133 /* Just stop init -- if we fail, we'll restart it. */ 134 if (kill(1, SIGTSTP) == -1) 135 err(1, "SIGTSTP init"); 136 137 /* Ignore the SIGHUP we get when our parent shell dies. */ 138 (void)signal(SIGHUP, SIG_IGN); 139 140 /* Send a SIGTERM first, a chance to save the buffers. */ 141 if (kill(-1, SIGTERM) == -1) 142 err(1, "SIGTERM processes"); 143 144 /* 145 * After the processes receive the signal, start the rest of the 146 * buffers on their way. Wait 5 seconds between the SIGTERM and 147 * the SIGKILL to give everybody a chance. 148 */ 149 sleep(2); 150 if (!nflag) 151 sync(); 152 sleep(3); 153 154 for (i = 1;; ++i) { 155 if (kill(-1, SIGKILL) == -1) { 156 if (errno == ESRCH) 157 break; 158 goto restart; 159 } 160 if (i > 5) { 161 (void)fprintf(stderr, 162 "WARNING: some process(es) wouldn't die\n"); 163 break; 164 } 165 (void)sleep(2 * i); 166 } 167 168 reboot(howto); 169 /* FALLTHROUGH */ 170 171restart: 172 sverrno = errno; 173 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 174 strerror(sverrno)); 175 /* NOTREACHED */ 176} 177 178void 179usage() 180{ 181 (void)fprintf(stderr, "usage: %s [-nq]\n", dohalt ? "halt" : "reboot"); 182 exit(1); 183} 184