system_cmds-597.1.1/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 <bootstrap_priv.h>
  70 #include <reboot2.h>
  71 #include <utmpx.h>
  72 #include <sys/time.h>
  73 #endif
  74
  75 void usage(void);
  76 u_int get_pageins(void);
  77 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
  78 int reserve_reboot(void);
  79 #endif
  80
  81 int dohalt;
  82
  83 int
  84 main(int argc, char *argv[])
  85 {
  86         struct passwd *pw;
  87         int ch, howto, kflag, lflag, nflag, qflag, uflag;
  88         char *p;
  89         const char *user;
  90 #ifndef __APPLE__
  91         int i, fd, pflag, sverrno;
  92         u_int pageins;
  93         char *kernel;
  94 #endif
  95
  96         if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
  97                 dohalt = 1;
  98                 howto = RB_HALT;
  99         } else
 100                 howto = 0;
 101         kflag = lflag = nflag = qflag = 0;
 102 #ifndef __APPLE__
 103         while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
 104 #else
 105         while ((ch = getopt(argc, argv, "lnqu")) != -1)
 106 #endif
 107                 switch(ch) {
 108 #ifndef __APPLE__
 109                 case 'd':
 110                         howto |= RB_DUMP;
 111                         break;
 112                 case 'k':
 113                         kflag = 1;
 114                         kernel = optarg;
 115                         break;
 116 #endif
 117                 case 'l':
 118                         lflag = 1;
 119                         break;
 120                 case 'n':
 121                         nflag = 1;
 122                         howto |= RB_NOSYNC;
 123                         break;
 124 /* -p is irrelevant on OS X.  It does that anyway. */
 125 #ifndef __APPLE__
 126                 case 'p':
 127                         pflag = 1;
 128                         howto |= RB_POWEROFF;
 129                         break;
 130 #endif
 131                 case 'u':
 132                         uflag = 1;
 133                         howto |= RB_UPSDELAY;
 134                         break;
 135                 case 'q':
 136                         qflag = 1;
 137                         howto |= RB_QUICK;
 138                         break;
 139                 case '?':
 140                 default:
 141                         usage();
 142                 }
 143         argc -= optind;
 144         argv += optind;
 145
 146 #ifndef __APPLE__
 147         if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 148                 errx(1, "cannot dump (-d) when halting; must reboot instead");
 149 #endif
 150         if (geteuid()) {
 151                 errno = EPERM;
 152                 err(1, NULL);
 153         }
 154
 155 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
 156         if (!qflag && !lflag) { // shutdown(8) has already checked w/kextd
 157                 if ((errno = reserve_reboot()))
 158                         err(1, "couldn't lock for reboot");
 159         }
 160 #endif
 161
 162         if (qflag) {
 163                 reboot(howto);
 164                 err(1, NULL);
 165         }
 166
 167 #ifndef __APPLE__
 168         if (kflag) {
 169                 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
 170                 if (fd > -1) {
 171                         (void)write(fd, "nextboot_enable=\"YES\"\n", 22);
 172                         (void)write(fd, "kernel=\"", 8L);
 173                         (void)write(fd, kernel, strlen(kernel));
 174                         (void)write(fd, "\"\n", 2);
 175                         close(fd);
 176                 }
 177         }
 178 #endif
 179
 180         /* Log the reboot. */
 181         if (!lflag)  {
 182                 if ((user = getlogin()) == NULL)
 183                         user = (pw = getpwuid(getuid())) ?
 184                             pw->pw_name : "???";
 185                 if (dohalt) {
 186                         openlog("halt", 0, LOG_AUTH | LOG_CONS);
 187                         syslog(LOG_CRIT, "halted by %s%s", user,
 188                              (howto & RB_UPSDELAY) ? " with UPS delay":"");
 189                 } else {
 190                         openlog("reboot", 0, LOG_AUTH | LOG_CONS);
 191                         syslog(LOG_CRIT, "rebooted by %s", user);
 192                 }
 193         }
 194 #if defined(__APPLE__)
 195         {
 196                 struct utmpx utx;
 197                 bzero(&utx, sizeof(utx));
 198                 utx.ut_type = SHUTDOWN_TIME;
 199                 gettimeofday(&utx.ut_tv, NULL);
 200                 pututxline(&utx);
 201
 202                 int newvalue = 1;
 203                 sysctlbyname("kern.willshutdown", NULL, NULL, &newvalue, sizeof(newvalue));
 204         }
 205 #else
 206         logwtmp("~", "shutdown", "");
 207 #endif
 208
 209         /*
 210          * Do a sync early on, so disks start transfers while we're off
 211          * killing processes.  Don't worry about writes done before the
 212          * processes die, the reboot system call syncs the disks.
 213          */
 214         if (!nflag)
 215                 sync();
 216
 217 #ifndef __APPLE__
 218         /* Just stop init -- if we fail, we'll restart it. */
 219         if (kill(1, SIGTSTP) == -1)
 220                 err(1, "SIGTSTP init");
 221 #endif
 222
 223         /* Ignore the SIGHUP we get when our parent shell dies. */
 224         (void)signal(SIGHUP, SIG_IGN);
 225
 226 #ifndef __APPLE__
 227         /* Send a SIGTERM first, a chance to save the buffers. */
 228         if (kill(-1, SIGTERM) == -1)
 229                 err(1, "SIGTERM processes");
 230
 231         /*
 232          * After the processes receive the signal, start the rest of the
 233          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 234          * the SIGKILL to give everybody a chance. If there is a lot of
 235          * paging activity then wait longer, up to a maximum of approx
 236          * 60 seconds.
 237          */
 238         sleep(2);
 239         for (i = 0; i < 20; i++) {
 240                 pageins = get_pageins();
 241                 if (!nflag)
 242                         sync();
 243                 sleep(3);
 244                 if (get_pageins() == pageins)
 245                         break;
 246         }
 247
 248         for (i = 1;; ++i) {
 249                 if (kill(-1, SIGKILL) == -1) {
 250                         if (errno == ESRCH)
 251                                 break;
 252                         goto restart;
 253                 }
 254                 if (i > 5) {
 255                         (void)fprintf(stderr,
 256                             "WARNING: some process(es) wouldn't die\n");
 257                         break;
 258                 }
 259                 (void)sleep(2 * i);
 260         }
 261 #endif
 262
 263 #ifdef __APPLE__
 264         // launchd(8) handles reboot.  This call returns NULL on success.
 265         exit(reboot2(howto) == NULL ? EXIT_SUCCESS : EXIT_FAILURE);
 266 #else /* __APPLE__ */
 267         reboot(howto);
 268         /* FALLTHROUGH */
 269
 270 restart:
 271         sverrno = errno;
 272         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 273             strerror(sverrno));
 274         /* NOTREACHED */
 275 #endif /* __APPLE__ */
 276 }
 277
 278 void
 279 usage()
 280 {
 281 #ifndef __APPLE__
 282         (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
 283 #else
 284         (void)fprintf(stderr, "usage: %s [-lnq]\n",
 285 #endif
 286             dohalt ? "halt" : "reboot");
 287         exit(1);
 288 }
 289
 290 u_int
 291 get_pageins()
 292 {
 293         u_int pageins;
 294         size_t len;
 295
 296         len = sizeof(pageins);
 297         if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
 298             != 0) {
 299                 warnx("v_swappgsin");
 300                 return (0);
 301         }
 302         return pageins;
 303 }
 304
 305 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
 306 // XX this routine is also in shutdown.tproj; it would be nice to share
 307
 308 #define WAITFORLOCK 1
 309 /*
 310  * contact kextd to lock for reboot
 311  */
 312 int
 313 reserve_reboot()
 314 {
 315         int rval = ELAST + 1;
 316         kern_return_t macherr = KERN_FAILURE;
 317         mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 318         int busyStatus = ELAST + 1;
 319         mountpoint_t busyVol;
 320
 321         macherr = bootstrap_look_up2(bootstrap_port, KEXTD_SERVER_NAME, &kxport, 0, BOOTSTRAP_PRIVILEGED_SERVER);
 322         if (macherr)  goto finish;
 323
 324         // allocate a port to pass to kextd (in case we die)
 325         tport = mach_task_self();
 326         if (tport == MACH_PORT_NULL)  goto finish;
 327         macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 328         if (macherr)  goto finish;
 329
 330         // try to lock for reboot
 331         macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 332                                       &busyStatus);
 333         if (macherr)  goto finish;
 334
 335         if (busyStatus == EBUSY) {
 336                 warnx("%s is busy updating; waiting for lock", busyVol);
 337                 macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 338                                                                                   busyVol, &busyStatus);
 339                 if (macherr)    goto finish;
 340         }
 341
 342         if (busyStatus == EALREADY) {
 343                 // reboot already in progress
 344                 rval = 0;
 345         } else {
 346                 rval = busyStatus;
 347         }
 348
 349 finish:
 350         // in general, we want to err on the side of allowing the reboot
 351         if (macherr) {
 352                 if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 353                         warnx("WARNING: couldn't lock kext manager for reboot: %s",
 354                                         mach_error_string(macherr));
 355                 rval = 0;
 356         }
 357         // unless we got the lock, clean up our port
 358         if (busyStatus != 0 && myport != MACH_PORT_NULL)
 359                 mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 360
 361         return rval;
 362 }
 363 #endif