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