reboot.c revision 1.7
1 /* $NetBSD: reboot.c,v 1.7 1995/03/18 16:11:54 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 #ifndef lint 37 static 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 43 #if 0 44 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 45 #else 46 static char rcsid[] = "$NetBSD: reboot.c,v 1.7 1995/03/18 16:11:54 cgd Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/reboot.h> 51 #include <signal.h> 52 #include <pwd.h> 53 #include <errno.h> 54 #include <syslog.h> 55 #include <unistd.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 60 void err __P((const char *fmt, ...)); 61 void usage __P((void)); 62 63 int dohalt; 64 65 int 66 main(argc, argv) 67 int argc; 68 char *argv[]; 69 { 70 register int i; 71 struct passwd *pw; 72 int ch, howto, lflag, nflag, qflag, sverrno; 73 char *p, *user; 74 75 if (!strcmp((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) { 76 dohalt = 1; 77 howto = RB_HALT; 78 } else 79 howto = 0; 80 lflag = nflag = qflag = 0; 81 while ((ch = getopt(argc, argv, "lnq")) != EOF) 82 switch(ch) { 83 case 'l': /* Undocumented; used by shutdown. */ 84 lflag = 1; 85 break; 86 case 'n': 87 nflag = 1; 88 howto |= RB_NOSYNC; 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 err("%s", strerror(EPERM)); 102 103 if (qflag) { 104 reboot(howto); 105 err("%s", strerror(errno)); 106 } 107 108 /* Log the reboot. */ 109 if (!lflag) { 110 if ((user = getlogin()) == NULL) 111 user = (pw = getpwuid(getuid())) ? 112 pw->pw_name : "???"; 113 if (dohalt) { 114 openlog("halt", 0, LOG_AUTH | LOG_CONS); 115 syslog(LOG_CRIT, "halted by %s", user); 116 } else { 117 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 118 syslog(LOG_CRIT, "rebooted by %s", user); 119 } 120 } 121 logwtmp("~", "shutdown", ""); 122 123 /* 124 * Do a sync early on, so disks start transfers while we're off 125 * killing processes. Don't worry about writes done before the 126 * processes die, the reboot system call syncs the disks. 127 */ 128 if (!nflag) 129 sync(); 130 131 /* Just stop init -- if we fail, we'll restart it. */ 132 if (kill(1, SIGTSTP) == -1) 133 err("SIGTSTP init: %s", strerror(errno)); 134 135 /* Ignore the SIGHUP we get when our parent shell dies. */ 136 (void)signal(SIGHUP, SIG_IGN); 137 138 /* Send a SIGTERM first, a chance to save the buffers. */ 139 if (kill(-1, SIGTERM) == -1) 140 err("SIGTERM processes: %s", strerror(errno)); 141 142 /* 143 * After the processes receive the signal, start the rest of the 144 * buffers on their way. Wait 5 seconds between the SIGTERM and 145 * the SIGKILL to give everybody a chance. 146 */ 147 sleep(2); 148 if (!nflag) 149 sync(); 150 sleep(3); 151 152 for (i = 1;; ++i) { 153 if (kill(-1, SIGKILL) == -1) { 154 if (errno == ESRCH) 155 break; 156 goto restart; 157 } 158 if (i > 5) { 159 (void)fprintf(stderr, 160 "WARNING: some process(es) wouldn't die\n"); 161 break; 162 } 163 (void)sleep(2 * i); 164 } 165 166 reboot(howto); 167 /* FALLTHROUGH */ 168 169 restart: 170 sverrno = errno; 171 err("%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 172 strerror(sverrno)); 173 /* NOTREACHED */ 174 } 175 176 void 177 usage() 178 { 179 (void)fprintf(stderr, "usage: %s [-nq]\n", dohalt ? "halt" : "reboot"); 180 exit(1); 181 } 182 183 #if __STDC__ 184 #include <stdarg.h> 185 #else 186 #include <varargs.h> 187 #endif 188 189 void 190 #if __STDC__ 191 err(const char *fmt, ...) 192 #else 193 err(fmt, va_alist) 194 char *fmt; 195 va_dcl 196 #endif 197 { 198 va_list ap; 199 #if __STDC__ 200 va_start(ap, fmt); 201 #else 202 va_start(ap); 203 #endif 204 (void)fprintf(stderr, "%s: ", dohalt ? "halt" : "reboot"); 205 (void)vfprintf(stderr, fmt, ap); 206 va_end(ap); 207 (void)fprintf(stderr, "\n"); 208 exit(1); 209 /* NOTREACHED */ 210 } 211
Indexes created Tue Sep 23 14:10:03 GMT 2025