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: src/sbin/reboot/reboot.c,v 1.9.2.4 2002/04/28 22:50:00 wes Exp $"; 46 #endif /* not lint */ 47 48 #include <sys/reboot.h> 49 #include <sys/types.h> 50 #include <sys/sysctl.h> 51 #include <signal.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <libutil.h> 56 #include <pwd.h> 57 #include <syslog.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 void usage(void); 64 u_int get_pageins(void); 65 66 int dohalt; 67 68 int 69 main(int argc, char *argv[]) 70 { 71 struct passwd *pw; 72 int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno; 73 u_int pageins; 74 char *kernel, *p; 75 const char *user; 76 77 if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) { 78 dohalt = 1; 79 howto = RB_HALT; 80 } else 81 howto = 0; 82 kflag = lflag = nflag = qflag = 0; 83 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 84 switch(ch) { 85 case 'd': 86 howto |= RB_DUMP; 87 break; 88 case 'k': 89 kflag = 1; 90 kernel = optarg; 91 break; 92 case 'l': 93 lflag = 1; 94 break; 95 case 'n': 96 nflag = 1; 97 howto |= RB_NOSYNC; 98 break; 99 case 'p': 100 pflag = 1; 101 howto |= (RB_POWEROFF | RB_HALT); 102 break; 103 case 'q': 104 qflag = 1; 105 break; 106 case '?': 107 default: 108 usage(); 109 } 110 argc -= optind; 111 argv += optind; 112 113 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 114 errx(1, "cannot dump (-d) when halting; must reboot instead"); 115 if (geteuid()) { 116 errno = EPERM; 117 err(1, NULL); 118 } 119 120 if (qflag) { 121 reboot(howto); 122 err(1, NULL); 123 } 124 125 if (kflag) { 126 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444); 127 if (fd > -1) { 128 (void)write(fd, "kernel=\"", 8L); 129 (void)write(fd, kernel, strlen(kernel)); 130 (void)write(fd, "\"\n", 2); 131 close(fd); 132 } 133 } 134 135 /* Log the reboot. */ 136 if (!lflag) { 137 if ((user = getlogin()) == NULL) 138 user = (pw = getpwuid(getuid())) ? 139 pw->pw_name : "???"; 140 if (dohalt) { 141 openlog("halt", 0, LOG_AUTH | LOG_CONS); 142 syslog(LOG_CRIT, "halted by %s", user); 143 } else { 144 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 145 syslog(LOG_CRIT, "rebooted by %s", user); 146 } 147 } 148 logwtmp("~", "shutdown", ""); 149 150 /* 151 * Do a sync early on, so disks start transfers while we're off 152 * killing processes. Don't worry about writes done before the 153 * processes die, the reboot system call syncs the disks. 154 */ 155 if (!nflag) 156 sync(); 157 158 /* Just stop init -- if we fail, we'll restart it. */ 159 if (kill(1, SIGTSTP) == -1) 160 err(1, "SIGTSTP init"); 161 162 /* Ignore the SIGHUP we get when our parent shell dies. */ 163 (void)signal(SIGHUP, SIG_IGN); 164 165 /* Send a SIGTERM first, a chance to save the buffers. */ 166 if (kill(-1, SIGTERM) == -1) 167 err(1, "SIGTERM processes"); 168 169 /* 170 * After the processes receive the signal, start the rest of the 171 * buffers on their way. Wait 5 seconds between the SIGTERM and 172 * the SIGKILL to give everybody a chance. If there is a lot of 173 * paging activity then wait longer, up to a maximum of approx 174 * 60 seconds. 175 */ 176 sleep(2); 177 for (i = 0; i < 20; i++) { 178 pageins = get_pageins(); 179 if (!nflag) 180 sync(); 181 sleep(3); 182 if (get_pageins() == pageins) 183 break; 184 } 185 186 for (i = 1;; ++i) { 187 if (kill(-1, SIGKILL) == -1) { 188 if (errno == ESRCH) 189 break; 190 goto restart; 191 } 192 if (i > 5) { 193 (void)fprintf(stderr, 194 "WARNING: some process(es) wouldn't die\n"); 195 break; 196 } 197 (void)sleep(2 * i); 198 } 199 200 reboot(howto); 201 /* FALLTHROUGH */ 202 203 restart: 204 sverrno = errno; 205 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 206 strerror(sverrno)); 207 /* NOTREACHED */ 208 } 209 210 void 211 usage() 212 { 213 (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 214 dohalt ? "halt" : "reboot"); 215 exit(1); 216 } 217 218 u_int 219 get_pageins() 220 { 221 u_int pageins; 222 size_t len; 223 224 len = sizeof(pageins); 225 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 226 != 0) { 227 warnx("v_swappgsin"); 228 return (0); 229 } 230 return pageins; 231 } 232