reboot.tproj/reboot.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Portions copyright (c) 2007 Apple Inc.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  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 #if 0
  39 static char sccsid[] = "@(#)reboot.c    8.1 (Berkeley) 6/5/93";
  40 #endif
  41 static const char rcsid[] =
  42   "$FreeBSD: src/sbin/reboot/reboot.c,v 1.17 2002/10/06 16:24:36 thomas Exp $";
  43 #endif /* not lint */
  44
  45 #include <sys/reboot.h>
  46 #include <sys/types.h>
  47 #include <sys/sysctl.h>
  48 #include <signal.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <util.h>
  53 #include <pwd.h>
  54 #include <syslog.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 #ifdef __APPLE__
  61 #include <TargetConditionals.h>
  62 #if !TARGET_OS_EMBEDDED
  63 #include "kextmanager.h"
  64 #include <IOKit/kext/kextmanager_types.h>
  65 #endif
  66 #include <mach/mach_port.h>             // allocate
  67 #include <mach/mach.h>                  // task_self, etc
  68 #include <servers/bootstrap.h>  // bootstrap
  69 #include <reboot2.h>
  70 #endif
  71
  72 void usage(void);
  73 u_int get_pageins(void);
  74 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
  75 int reserve_reboot(void);
  76 #endif
  77
  78 int dohalt;
  79
  80 int
  81 main(int argc, char *argv[])
  82 {
  83         struct passwd *pw;
  84         int ch, howto, kflag, lflag, nflag, qflag, uflag;
  85         char *p;
  86         const char *user;
  87 #ifndef __APPLE__
  88         int i, fd, pflag, sverrno;
  89         u_int pageins;
  90         char *kernel;
  91 #endif
  92
  93         if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
  94                 dohalt = 1;
  95                 howto = RB_HALT;
  96         } else
  97                 howto = 0;
  98         kflag = lflag = nflag = qflag = 0;
  99 #ifndef __APPLE__
 100         while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
 101 #else
 102         while ((ch = getopt(argc, argv, "lnqu")) != -1)
 103 #endif
 104                 switch(ch) {
 105 #ifndef __APPLE__
 106                 case 'd':
 107                         howto |= RB_DUMP;
 108                         break;
 109                 case 'k':
 110                         kflag = 1;
 111                         kernel = optarg;
 112                         break;
 113 #endif
 114                 case 'l':
 115                         lflag = 1;
 116                         break;
 117                 case 'n':
 118                         nflag = 1;
 119                         howto |= RB_NOSYNC;
 120                         break;
 121 /* -p is irrelevant on OS X.  It does that anyway. */
 122 #ifndef __APPLE__
 123                 case 'p':
 124                         pflag = 1;
 125                         howto |= RB_POWEROFF;
 126                         break;
 127 #endif
 128                 case 'u':
 129                         uflag = 1;
 130                         howto |= RB_UPSDELAY;
 131                         break;
 132                 case 'q':
 133                         qflag = 1;
 134                         howto |= RB_QUICK;
 135                         break;
 136                 case '?':
 137                 default:
 138                         usage();
 139                 }
 140         argc -= optind;
 141         argv += optind;
 142
 143 #ifndef __APPLE__
 144         if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 145                 errx(1, "cannot dump (-d) when halting; must reboot instead");
 146 #endif
 147         if (geteuid()) {
 148                 errno = EPERM;
 149                 err(1, NULL);
 150         }
 151
 152 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
 153         if (!lflag) {   // shutdown(8) has already checked w/kextd
 154                 if ((errno = reserve_reboot()) && !qflag)
 155                         err(1, "couldn't lock for reboot");
 156         }
 157 #endif
 158
 159         if (qflag) {
 160                 #ifdef __APPLE__
 161                         // launchd(8) handles reboot.  This call returns NULL on success.
 162                         exit(reboot2(howto) == NULL ? EXIT_SUCCESS : EXIT_FAILURE);
 163                 #else /* __APPLE__ */
 164                 reboot(howto);
 165                 #endif /* __APPLE__ */
 166                 err(1, NULL);
 167         }
 168
 169 #ifndef __APPLE__
 170         if (kflag) {
 171                 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
 172                 if (fd > -1) {
 173                         (void)write(fd, "nextboot_enable=\"YES\"\n", 22);
 174                         (void)write(fd, "kernel=\"", 8L);
 175                         (void)write(fd, kernel, strlen(kernel));
 176                         (void)write(fd, "\"\n", 2);
 177                         close(fd);
 178                 }
 179         }
 180 #endif
 181
 182         /* Log the reboot. */
 183         if (!lflag)  {
 184                 if ((user = getlogin()) == NULL)
 185                         user = (pw = getpwuid(getuid())) ?
 186                             pw->pw_name : "???";
 187                 if (dohalt) {
 188                         openlog("halt", 0, LOG_AUTH | LOG_CONS);
 189                         syslog(LOG_CRIT, "halted by %s%s", user,
 190                              (howto & RB_UPSDELAY) ? " with UPS delay":"");
 191                 } else {
 192                         openlog("reboot", 0, LOG_AUTH | LOG_CONS);
 193                         syslog(LOG_CRIT, "rebooted by %s", user);
 194                 }
 195         }
 196         logwtmp("~", "shutdown", "");
 197
 198         /*
 199          * Do a sync early on, so disks start transfers while we're off
 200          * killing processes.  Don't worry about writes done before the
 201          * processes die, the reboot system call syncs the disks.
 202          */
 203         if (!nflag)
 204                 sync();
 205
 206 #ifndef __APPLE__
 207         /* Just stop init -- if we fail, we'll restart it. */
 208         if (kill(1, SIGTSTP) == -1)
 209                 err(1, "SIGTSTP init");
 210 #endif
 211
 212         /* Ignore the SIGHUP we get when our parent shell dies. */
 213         (void)signal(SIGHUP, SIG_IGN);
 214
 215 #ifndef __APPLE__
 216         /* Send a SIGTERM first, a chance to save the buffers. */
 217         if (kill(-1, SIGTERM) == -1)
 218                 err(1, "SIGTERM processes");
 219
 220         /*
 221          * After the processes receive the signal, start the rest of the
 222          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 223          * the SIGKILL to give everybody a chance. If there is a lot of
 224          * paging activity then wait longer, up to a maximum of approx
 225          * 60 seconds.
 226          */
 227         sleep(2);
 228         for (i = 0; i < 20; i++) {
 229                 pageins = get_pageins();
 230                 if (!nflag)
 231                         sync();
 232                 sleep(3);
 233                 if (get_pageins() == pageins)
 234                         break;
 235         }
 236
 237         for (i = 1;; ++i) {
 238                 if (kill(-1, SIGKILL) == -1) {
 239                         if (errno == ESRCH)
 240                                 break;
 241                         goto restart;
 242                 }
 243                 if (i > 5) {
 244                         (void)fprintf(stderr,
 245                             "WARNING: some process(es) wouldn't die\n");
 246                         break;
 247                 }
 248                 (void)sleep(2 * i);
 249         }
 250 #endif
 251
 252 #ifdef __APPLE__
 253         // launchd(8) handles reboot.  This call returns NULL on success.
 254         exit(reboot2(howto) == NULL ? EXIT_SUCCESS : EXIT_FAILURE);
 255 #else /* __APPLE__ */
 256         reboot(howto);
 257         /* FALLTHROUGH */
 258
 259 restart:
 260         sverrno = errno;
 261         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 262             strerror(sverrno));
 263         /* NOTREACHED */
 264 #endif /* __APPLE__ */
 265 }
 266
 267 void
 268 usage()
 269 {
 270 #ifndef __APPLE__
 271         (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
 272 #else
 273         (void)fprintf(stderr, "usage: %s [-lnq]\n",
 274 #endif
 275             dohalt ? "halt" : "reboot");
 276         exit(1);
 277 }
 278
 279 u_int
 280 get_pageins()
 281 {
 282         u_int pageins;
 283         size_t len;
 284
 285         len = sizeof(pageins);
 286         if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
 287             != 0) {
 288                 warnx("v_swappgsin");
 289                 return (0);
 290         }
 291         return pageins;
 292 }
 293
 294 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
 295 // XX this routine is also in shutdown.tproj; it would be nice to share
 296
 297 #define WAITFORLOCK 1
 298 /*
 299  * contact kextd to lock for reboot
 300  */
 301 int
 302 reserve_reboot()
 303 {
 304         int rval = ELAST + 1;
 305         kern_return_t macherr = KERN_FAILURE;
 306         mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 307         int busyStatus = ELAST + 1;
 308         mountpoint_t busyVol;
 309
 310         macherr = bootstrap_look_up(bootstrap_port, KEXTD_SERVER_NAME, &kxport);
 311         if (macherr)  goto finish;
 312
 313         // allocate a port to pass to kextd (in case we die)
 314         tport = mach_task_self();
 315         if (tport == MACH_PORT_NULL)  goto finish;
 316         macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 317         if (macherr)  goto finish;
 318
 319         // try to lock for reboot
 320         macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 321                                       &busyStatus);
 322         if (macherr)  goto finish;
 323
 324         if (busyStatus == EBUSY) {
 325                 warnx("%s is busy updating; waiting for lock", busyVol);
 326                 macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 327                                                                                   busyVol, &busyStatus);
 328                 if (macherr)    goto finish;
 329         }
 330
 331         if (busyStatus == EALREADY) {
 332                 // reboot already in progress
 333                 rval = 0;
 334         } else {
 335                 rval = busyStatus;
 336         }
 337
 338 finish:
 339         // in general, we want to err on the side of allowing the reboot
 340         if (macherr) {
 341                 if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 342                         warnx("WARNING: couldn't lock kext manager for reboot: %s",
 343                                         mach_error_string(macherr));
 344                 rval = 0;
 345         }
 346         // unless we got the lock, clean up our port
 347         if (busyStatus != 0 && myport != MACH_PORT_NULL)
 348                 mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 349
 350         return rval;
 351 }
 352 #endif