reboot.tproj/reboot.c

   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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1980, 1986, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)reboot.c    8.1 (Berkeley) 6/5/93";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/sbin/reboot/reboot.c,v 1.17 2002/10/06 16:24:36 thomas Exp $";
  46 #endif /* not lint */
  47
  48 #include <sys/reboot.h>
  49 #include <sys/types.h>
  50 #include <sys/sysctl.h>
  51 #include <signal.h>
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <fcntl.h>
  55 #include <util.h>
  56 #include <pwd.h>
  57 #include <syslog.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62
  63 void usage(void);
  64 u_int get_pageins(void);
  65
  66 int dohalt;
  67
  68 int
  69 main(int argc, char *argv[])
  70 {
  71         struct passwd *pw;
  72         int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno;
  73         u_int pageins;
  74         char *kernel, *p;
  75         const char *user;
  76
  77         if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
  78                 dohalt = 1;
  79                 howto = RB_HALT;
  80         } else
  81                 howto = 0;
  82         kflag = lflag = nflag = qflag = 0;
  83 #ifndef __APPLE__
  84         while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
  85 #else
  86         while ((ch = getopt(argc, argv, "lnq")) != -1)
  87 #endif
  88                 switch(ch) {
  89 #ifndef __APPLE__
  90                 case 'd':
  91                         howto |= RB_DUMP;
  92                         break;
  93                 case 'k':
  94                         kflag = 1;
  95                         kernel = optarg;
  96                         break;
  97 #endif
  98                 case 'l':
  99                         lflag = 1;
 100                         break;
 101                 case 'n':
 102                         nflag = 1;
 103                         howto |= RB_NOSYNC;
 104                         break;
 105 /* -p is irrelevant on OS X.  It does that anyway. */
 106 #ifndef __APPLE__
 107                 case 'p':
 108                         pflag = 1;
 109                         howto |= RB_POWEROFF;
 110                         break;
 111 #endif
 112                 case 'q':
 113                         qflag = 1;
 114                         break;
 115                 case '?':
 116                 default:
 117                         usage();
 118                 }
 119         argc -= optind;
 120         argv += optind;
 121
 122 #ifndef __APPLE__
 123         if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 124                 errx(1, "cannot dump (-d) when halting; must reboot instead");
 125 #endif
 126         if (geteuid()) {
 127                 errno = EPERM;
 128                 err(1, NULL);
 129         }
 130
 131         if (qflag) {
 132                 reboot(howto);
 133                 err(1, NULL);
 134         }
 135
 136 #ifndef __APPLE__
 137         if (kflag) {
 138                 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
 139                 if (fd > -1) {
 140                         (void)write(fd, "nextboot_enable=\"YES\"\n", 22);
 141                         (void)write(fd, "kernel=\"", 8L);
 142                         (void)write(fd, kernel, strlen(kernel));
 143                         (void)write(fd, "\"\n", 2);
 144                         close(fd);
 145                 }
 146         }
 147 #endif
 148
 149         /* Log the reboot. */
 150         if (!lflag)  {
 151                 if ((user = getlogin()) == NULL)
 152                         user = (pw = getpwuid(getuid())) ?
 153                             pw->pw_name : "???";
 154                 if (dohalt) {
 155                         openlog("halt", 0, LOG_AUTH | LOG_CONS);
 156                         syslog(LOG_CRIT, "halted by %s", user);
 157                 } else {
 158                         openlog("reboot", 0, LOG_AUTH | LOG_CONS);
 159                         syslog(LOG_CRIT, "rebooted by %s", user);
 160                 }
 161         }
 162         logwtmp("~", "shutdown", "");
 163
 164         /*
 165          * Do a sync early on, so disks start transfers while we're off
 166          * killing processes.  Don't worry about writes done before the
 167          * processes die, the reboot system call syncs the disks.
 168          */
 169         if (!nflag)
 170                 sync();
 171
 172         /* Just stop init -- if we fail, we'll restart it. */
 173         if (kill(1, SIGTSTP) == -1)
 174                 err(1, "SIGTSTP init");
 175
 176         /* Ignore the SIGHUP we get when our parent shell dies. */
 177         (void)signal(SIGHUP, SIG_IGN);
 178
 179 #ifndef __APPLE__
 180         /* Send a SIGTERM first, a chance to save the buffers. */
 181         if (kill(-1, SIGTERM) == -1)
 182                 err(1, "SIGTERM processes");
 183
 184         /*
 185          * After the processes receive the signal, start the rest of the
 186          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 187          * the SIGKILL to give everybody a chance. If there is a lot of
 188          * paging activity then wait longer, up to a maximum of approx
 189          * 60 seconds.
 190          */
 191         sleep(2);
 192         for (i = 0; i < 20; i++) {
 193                 pageins = get_pageins();
 194                 if (!nflag)
 195                         sync();
 196                 sleep(3);
 197                 if (get_pageins() == pageins)
 198                         break;
 199         }
 200
 201         for (i = 1;; ++i) {
 202                 if (kill(-1, SIGKILL) == -1) {
 203                         if (errno == ESRCH)
 204                                 break;
 205                         goto restart;
 206                 }
 207                 if (i > 5) {
 208                         (void)fprintf(stderr,
 209                             "WARNING: some process(es) wouldn't die\n");
 210                         break;
 211                 }
 212                 (void)sleep(2 * i);
 213         }
 214 #endif
 215
 216         reboot(howto);
 217         /* FALLTHROUGH */
 218
 219 restart:
 220         sverrno = errno;
 221         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 222             strerror(sverrno));
 223         /* NOTREACHED */
 224 }
 225
 226 void
 227 usage()
 228 {
 229 #ifndef __APPLE__
 230         (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
 231 #else
 232         (void)fprintf(stderr, "usage: %s [-lnq]\n",
 233 #endif
 234             dohalt ? "halt" : "reboot");
 235         exit(1);
 236 }
 237
 238 u_int
 239 get_pageins()
 240 {
 241         u_int pageins;
 242         size_t len;
 243
 244         len = sizeof(pageins);
 245         if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
 246             != 0) {
 247                 warnx("v_swappgsin");
 248                 return (0);
 249         }
 250         return pageins;
 251 }