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 95 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 96 errx(1, "cannot dump (-d) when halting; must reboot instead"); 97 if (geteuid()) { 98 errno = EPERM; 99 err(1, NULL); 100 } 101 102 if (qflag) { 103 reboot(howto); 104 err(1, NULL); 105 } 106 107 /* Log the reboot. */ 108 if (!lflag) { 109 if ((user = getlogin()) == NULL) 110 user = (pw = getpwuid(getuid())) ? 111 pw->pw_name : "???"; 112 if (dohalt) { 113 openlog("halt", 0, LOG_AUTH | LOG_CONS); 114 syslog(LOG_CRIT, "halted by %s", user); 115 } else { 116 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 117 syslog(LOG_CRIT, "rebooted by %s", user); 118 } 119 } 120 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS); 121 122 /* 123 * Do a sync early on, so disks start transfers while we're off 124 * killing processes. Don't worry about writes done before the 125 * processes die, the reboot system call syncs the disks. 126 */ 127 if (!nflag) 128 sync(); 129 130 /* Just stop init -- if we fail, we'll restart it. */ 131 if (kill(1, SIGTSTP) == -1) 132 err(1, "SIGTSTP init"); 133 134 /* Ignore the SIGHUP we get when our parent shell dies. */ 135 signal(SIGHUP, SIG_IGN); 136 /* parent shell might also send a SIGTERM? Best to ignore as well */ 137 signal(SIGTERM, SIG_IGN); 138 139 /* Send a SIGTERM first, a chance to save the buffers. */ 140 if (kill(-1, SIGTERM) == -1) 141 err(1, "SIGTERM processes"); 142 143 /* 144 * After the processes receive the signal, start the rest of the 145 * buffers on their way. Wait 5 seconds between the SIGTERM and 146 * the SIGKILL to give everybody a chance. If there is a lot of 147 * paging activity then wait longer, up to a maximum of approx 148 * 60 seconds. 149 */ 150 sleep(2); 151 for (i = 0; i < 20; i++) { 152 pageins = get_pageins(); 153 if (!nflag) 154 sync(); 155 sleep(3); 156 if (get_pageins() == pageins) 157 break; 158 } 159 160 for (i = 1;; ++i) { 161 if (kill(-1, SIGKILL) == -1) { 162 if (errno == ESRCH) 163 break; 164 goto restart; 165 } 166 if (i > 5) { 167 fprintf(stderr, 168 "WARNING: some process(es) wouldn't die\n"); 169 break; 170 } 171 sleep(2 * i); 172 } 173 174 reboot(howto); 175 /* FALLTHROUGH */ 176 177 restart: 178 sverrno = errno; 179 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 180 strerror(sverrno)); 181 /* NOTREACHED */ 182 } 183 184 static void 185 usage(void) 186 { 187 fprintf(stderr, "usage: %s [-dnpq]\n", dohalt ? "halt" : "reboot"); 188 exit(1); 189 } 190 191 static u_int 192 get_pageins(void) 193 { 194 u_int pageins; 195 size_t len; 196 197 len = sizeof(pageins); 198 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 199 != 0) { 200 warnx("v_swappgsin"); 201 return (0); 202 } 203 return pageins; 204 } 205