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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1980, 1986, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)reboot.c 8.1 (Berkeley) 6/5/93 31 * $FreeBSD: src/sbin/reboot/reboot.c,v 1.9.2.4 2002/04/28 22:50:00 wes Exp $ 32 */ 33 34 #include <sys/reboot.h> 35 #include <sys/types.h> 36 #include <sys/sysctl.h> 37 #include <signal.h> 38 #include <err.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <libutil.h> 42 #include <pwd.h> 43 #include <syslog.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 #ifdef SUPPORT_UTMPX 49 #include <utmpx.h> 50 #endif 51 52 void usage(void) __dead2; 53 u_int get_pageins(void); 54 55 int dohalt; 56 57 int 58 main(int argc, char *argv[]) 59 { 60 struct passwd *pw; 61 int ch, howto, i, fd, kflag, lflag, nflag, qflag, sverrno; 62 u_int pageins; 63 char *kernel = NULL, *p; 64 const char *user; 65 66 if (strstr((p = strrchr(*argv, '/')) ? p + 1 : *argv, "halt")) { 67 dohalt = 1; 68 howto = RB_HALT; 69 } else 70 howto = 0; 71 kflag = lflag = nflag = qflag = 0; 72 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 73 switch(ch) { 74 case 'd': 75 howto |= RB_DUMP; 76 break; 77 case 'k': 78 kflag = 1; 79 kernel = optarg; 80 break; 81 case 'l': 82 lflag = 1; 83 break; 84 case 'n': 85 nflag = 1; 86 howto |= RB_NOSYNC; 87 break; 88 case 'p': 89 howto |= (RB_POWEROFF | RB_HALT); 90 break; 91 case 'q': 92 qflag = 1; 93 break; 94 case '?': 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 102 errx(1, "cannot dump (-d) when halting; must reboot instead"); 103 if (geteuid()) { 104 errno = EPERM; 105 err(1, NULL); 106 } 107 108 if (qflag) { 109 reboot(howto); 110 err(1, NULL); 111 } 112 113 if (kflag) { 114 fd = open("/boot/nextboot.conf", 115 O_WRONLY | O_CREAT | O_TRUNC, 0444); 116 if (fd != -1) { 117 write(fd, "kernel=\"", 8L); 118 write(fd, kernel, strlen(kernel)); 119 write(fd, "\"\n", 2); 120 close(fd); 121 } 122 } 123 124 /* Log the reboot. */ 125 if (!lflag) { 126 if ((user = getlogin()) == NULL) 127 user = (pw = getpwuid(getuid())) ? 128 pw->pw_name : "???"; 129 if (dohalt) { 130 openlog("halt", 0, LOG_AUTH | LOG_CONS); 131 syslog(LOG_CRIT, "halted by %s", user); 132 } else { 133 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 134 syslog(LOG_CRIT, "rebooted by %s", user); 135 } 136 } 137 #ifdef SUPPORT_UTMP 138 logwtmp("~", "shutdown", ""); 139 #endif 140 #ifdef SUPPORT_UTMPX 141 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS); 142 #endif 143 144 /* 145 * Do a sync early on, so disks start transfers while we're off 146 * killing processes. Don't worry about writes done before the 147 * processes die, the reboot system call syncs the disks. 148 */ 149 if (!nflag) 150 sync(); 151 152 /* Just stop init -- if we fail, we'll restart it. */ 153 if (kill(1, SIGTSTP) == -1) 154 err(1, "SIGTSTP init"); 155 156 /* Ignore the SIGHUP we get when our parent shell dies. */ 157 signal(SIGHUP, SIG_IGN); 158 /* parent shell might also send a SIGTERM? Best to ignore as well */ 159 signal(SIGTERM, SIG_IGN); 160 161 /* Send a SIGTERM first, a chance to save the buffers. */ 162 if (kill(-1, SIGTERM) == -1) 163 err(1, "SIGTERM processes"); 164 165 /* 166 * After the processes receive the signal, start the rest of the 167 * buffers on their way. Wait 5 seconds between the SIGTERM and 168 * the SIGKILL to give everybody a chance. If there is a lot of 169 * paging activity then wait longer, up to a maximum of approx 170 * 60 seconds. 171 */ 172 sleep(2); 173 for (i = 0; i < 20; i++) { 174 pageins = get_pageins(); 175 if (!nflag) 176 sync(); 177 sleep(3); 178 if (get_pageins() == pageins) 179 break; 180 } 181 182 for (i = 1;; ++i) { 183 if (kill(-1, SIGKILL) == -1) { 184 if (errno == ESRCH) 185 break; 186 goto restart; 187 } 188 if (i > 5) { 189 fprintf(stderr, 190 "WARNING: some process(es) wouldn't die\n"); 191 break; 192 } 193 sleep(2 * i); 194 } 195 196 reboot(howto); 197 /* FALLTHROUGH */ 198 199 restart: 200 sverrno = errno; 201 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 202 strerror(sverrno)); 203 /* NOTREACHED */ 204 } 205 206 void 207 usage(void) 208 { 209 fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 210 dohalt ? "halt" : "reboot"); 211 exit(1); 212 } 213 214 u_int 215 get_pageins(void) 216 { 217 u_int pageins; 218 size_t len; 219 220 len = sizeof(pageins); 221 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 222 != 0) { 223 warnx("v_swappgsin"); 224 return (0); 225 } 226 return pageins; 227 } 228