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 * 4. 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 30 #if 0 31 #ifndef lint 32 static const char copyright[] = 33 "@(#) Copyright (c) 1980, 1986, 1993\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35 #endif /* not lint */ 36 37 #ifndef lint 38 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 39 #endif /* not lint */ 40 #endif 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/reboot.h> 45 #include <sys/types.h> 46 #include <sys/sysctl.h> 47 #include <signal.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <libutil.h> 52 #include <pwd.h> 53 #include <syslog.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 void usage(void); 60 u_int get_pageins(void); 61 62 int dohalt; 63 64 int 65 main(int argc, char *argv[]) 66 { 67 struct passwd *pw; 68 int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno; 69 u_int pageins; 70 char *kernel, *p; 71 const char *user; 72 73 if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) { 74 dohalt = 1; 75 howto = RB_HALT; 76 } else 77 howto = 0; 78 kflag = lflag = nflag = qflag = 0; 79 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 80 switch(ch) { 81 case 'd': 82 howto |= RB_DUMP; 83 break; 84 case 'k': 85 kflag = 1; 86 kernel = optarg; 87 break; 88 case 'l': 89 lflag = 1; 90 break; 91 case 'n': 92 nflag = 1; 93 howto |= RB_NOSYNC; 94 break; 95 case 'p': 96 pflag = 1; 97 howto |= RB_POWEROFF; 98 break; 99 case 'q': 100 qflag = 1; 101 break; 102 case '?': 103 default: 104 usage(); 105 } 106 argc -= optind; 107 argv += optind; 108 109 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 110 errx(1, "cannot dump (-d) when halting; must reboot instead"); 111 if (geteuid()) { 112 errno = EPERM; 113 err(1, NULL); 114 } 115 116 if (qflag) { 117 reboot(howto); 118 err(1, NULL); 119 } 120 121 if (kflag) { 122 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444); 123 if (fd > -1) { 124 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 125 (void)write(fd, "kernel=\"", 8L); 126 (void)write(fd, kernel, strlen(kernel)); 127 (void)write(fd, "\"\n", 2); 128 close(fd); 129 } 130 } 131 132 /* Log the reboot. */ 133 if (!lflag) { 134 if ((user = getlogin()) == NULL) 135 user = (pw = getpwuid(getuid())) ? 136 pw->pw_name : "???"; 137 if (dohalt) { 138 openlog("halt", 0, LOG_AUTH | LOG_CONS); 139 syslog(LOG_CRIT, "halted by %s", user); 140 } else { 141 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 142 syslog(LOG_CRIT, "rebooted by %s", user); 143 } 144 } 145 logwtmp("~", "shutdown", ""); 146 147 /* 148 * Do a sync early on, so disks start transfers while we're off 149 * killing processes. Don't worry about writes done before the 150 * processes die, the reboot system call syncs the disks. 151 */ 152 if (!nflag) 153 sync(); 154 155 /* Just stop init -- if we fail, we'll restart it. */ 156 if (kill(1, SIGTSTP) == -1) 157 err(1, "SIGTSTP init"); 158 159 /* Ignore the SIGHUP we get when our parent shell dies. */ 160 (void)signal(SIGHUP, SIG_IGN); 161 162 /* Send a SIGTERM first, a chance to save the buffers. */ 163 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 164 err(1, "SIGTERM processes"); 165 166 /* 167 * After the processes receive the signal, start the rest of the 168 * buffers on their way. Wait 5 seconds between the SIGTERM and 169 * the SIGKILL to give everybody a chance. If there is a lot of 170 * paging activity then wait longer, up to a maximum of approx 171 * 60 seconds. 172 */ 173 sleep(2); 174 for (i = 0; i < 20; i++) { 175 pageins = get_pageins(); 176 if (!nflag) 177 sync(); 178 sleep(3); 179 if (get_pageins() == pageins) 180 break; 181 } 182 183 for (i = 1;; ++i) { 184 if (kill(-1, SIGKILL) == -1) { 185 if (errno == ESRCH) 186 break; 187 goto restart; 188 } 189 if (i > 5) { 190 (void)fprintf(stderr, 191 "WARNING: some process(es) wouldn't die\n"); 192 break; 193 } 194 (void)sleep(2 * i); 195 } 196 197 reboot(howto); 198 /* FALLTHROUGH */ 199 200 restart: 201 sverrno = errno; 202 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 203 strerror(sverrno)); 204 /* NOTREACHED */ 205 } 206 207 void 208 usage() 209 { 210 (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 211 dohalt ? "halt" : "reboot"); 212 exit(1); 213 } 214 215 u_int 216 get_pageins() 217 { 218 u_int pageins; 219 size_t len; 220 221 len = sizeof(pageins); 222 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 223 != 0) { 224 warnx("v_swappgsin"); 225 return (0); 226 } 227 return pageins; 228 } 229