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 #include <utmpx.h> 49 50 void usage(void) __dead2; 51 u_int get_pageins(void); 52 53 int dohalt; 54 55 int 56 main(int argc, char *argv[]) 57 { 58 struct passwd *pw; 59 int ch, howto, i, fd, kflag, lflag, nflag, qflag, sverrno; 60 u_int pageins; 61 char *kernel = NULL, *p; 62 const char *user; 63 64 if (strstr((p = strrchr(*argv, '/')) ? p + 1 : *argv, "halt")) { 65 dohalt = 1; 66 howto = RB_HALT; 67 } else 68 howto = 0; 69 kflag = lflag = nflag = qflag = 0; 70 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 71 switch(ch) { 72 case 'd': 73 howto |= RB_DUMP; 74 break; 75 case 'k': 76 kflag = 1; 77 kernel = optarg; 78 break; 79 case 'l': 80 lflag = 1; 81 break; 82 case 'n': 83 nflag = 1; 84 howto |= RB_NOSYNC; 85 break; 86 case 'p': 87 howto |= (RB_POWEROFF | RB_HALT); 88 break; 89 case 'q': 90 qflag = 1; 91 break; 92 case '?': 93 default: 94 usage(); 95 } 96 argc -= optind; 97 argv += optind; 98 99 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 100 errx(1, "cannot dump (-d) when halting; must reboot instead"); 101 if (geteuid()) { 102 errno = EPERM; 103 err(1, NULL); 104 } 105 106 if (qflag) { 107 reboot(howto); 108 err(1, NULL); 109 } 110 111 if (kflag) { 112 fd = open("/boot/nextboot.conf", 113 O_WRONLY | O_CREAT | O_TRUNC, 0444); 114 if (fd != -1) { 115 write(fd, "kernel=\"", 8L); 116 write(fd, kernel, strlen(kernel)); 117 write(fd, "\"\n", 2); 118 close(fd); 119 } 120 } 121 122 /* Log the reboot. */ 123 if (!lflag) { 124 if ((user = getlogin()) == NULL) 125 user = (pw = getpwuid(getuid())) ? 126 pw->pw_name : "???"; 127 if (dohalt) { 128 openlog("halt", 0, LOG_AUTH | LOG_CONS); 129 syslog(LOG_CRIT, "halted by %s", user); 130 } else { 131 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 132 syslog(LOG_CRIT, "rebooted by %s", user); 133 } 134 } 135 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS); 136 137 /* 138 * Do a sync early on, so disks start transfers while we're off 139 * killing processes. Don't worry about writes done before the 140 * processes die, the reboot system call syncs the disks. 141 */ 142 if (!nflag) 143 sync(); 144 145 /* Just stop init -- if we fail, we'll restart it. */ 146 if (kill(1, SIGTSTP) == -1) 147 err(1, "SIGTSTP init"); 148 149 /* Ignore the SIGHUP we get when our parent shell dies. */ 150 signal(SIGHUP, SIG_IGN); 151 /* parent shell might also send a SIGTERM? Best to ignore as well */ 152 signal(SIGTERM, SIG_IGN); 153 154 /* Send a SIGTERM first, a chance to save the buffers. */ 155 if (kill(-1, SIGTERM) == -1) 156 err(1, "SIGTERM processes"); 157 158 /* 159 * After the processes receive the signal, start the rest of the 160 * buffers on their way. Wait 5 seconds between the SIGTERM and 161 * the SIGKILL to give everybody a chance. If there is a lot of 162 * paging activity then wait longer, up to a maximum of approx 163 * 60 seconds. 164 */ 165 sleep(2); 166 for (i = 0; i < 20; i++) { 167 pageins = get_pageins(); 168 if (!nflag) 169 sync(); 170 sleep(3); 171 if (get_pageins() == pageins) 172 break; 173 } 174 175 for (i = 1;; ++i) { 176 if (kill(-1, SIGKILL) == -1) { 177 if (errno == ESRCH) 178 break; 179 goto restart; 180 } 181 if (i > 5) { 182 fprintf(stderr, 183 "WARNING: some process(es) wouldn't die\n"); 184 break; 185 } 186 sleep(2 * i); 187 } 188 189 reboot(howto); 190 /* FALLTHROUGH */ 191 192 restart: 193 sverrno = errno; 194 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 195 strerror(sverrno)); 196 /* NOTREACHED */ 197 } 198 199 void 200 usage(void) 201 { 202 fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 203 dohalt ? "halt" : "reboot"); 204 exit(1); 205 } 206 207 u_int 208 get_pageins(void) 209 { 210 u_int pageins; 211 size_t len; 212 213 len = sizeof(pageins); 214 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 215 != 0) { 216 warnx("v_swappgsin"); 217 return (0); 218 } 219 return pageins; 220 } 221