system_cmds/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 #include <sys/cdefs.h>
  32
  33 #ifndef lint
  34 __unused static const char copyright[] =
  35 "@(#) Copyright (c) 1980, 1986, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 #if 0
  41 static char sccsid[] = "@(#)reboot.c    8.1 (Berkeley) 6/5/93";
  42 #endif
  43 __unused static const char rcsid[] =
  44   "$FreeBSD: src/sbin/reboot/reboot.c,v 1.17 2002/10/06 16:24:36 thomas Exp $";
  45 #endif /* not lint */
  46
  47 #include <sys/reboot.h>
  48 #include <sys/types.h>
  49 #include <sys/sysctl.h>
  50 #include <signal.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fcntl.h>
  54 #include <util.h>
  55 #include <pwd.h>
  56 #include <syslog.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61
  62 #ifdef __APPLE__
  63 #include <TargetConditionals.h>
  64 #if !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
  65 #include "kextmanager.h"
  66 #include <IOKit/kext/kextmanager_types.h>
  67 #endif
  68 #include <mach/mach_port.h>             // allocate
  69 #include <mach/mach.h>                  // task_self, etc
  70 #include <servers/bootstrap.h>  // bootstrap
  71 #include <bootstrap_priv.h>
  72 #include <reboot2.h>
  73 #include <utmpx.h>
  74 #include <sys/time.h>
  75 #endif
  76
  77 void usage(void);
  78 u_int get_pageins(void);
  79 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
  80 int reserve_reboot(void);
  81 #endif
  82
  83 int dohalt;
  84
  85 int
  86 main(int argc, char *argv[])
  87 {
  88         struct passwd *pw;
  89         int ch, howto, kflag, lflag, nflag, qflag, uflag;
  90         char *p;
  91         const char *user;
  92 #ifndef __APPLE__
  93         int i, fd, pflag, sverrno;
  94         u_int pageins;
  95         char *kernel;
  96 #endif
  97
  98         if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
  99                 dohalt = 1;
 100                 howto = RB_HALT;
 101         } else
 102                 howto = 0;
 103         kflag = lflag = nflag = qflag = 0;
 104 #ifndef __APPLE__
 105         while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
 106 #else
 107         while ((ch = getopt(argc, argv, "lnqu")) != -1)
 108 #endif
 109                 switch(ch) {
 110 #ifndef __APPLE__
 111                 case 'd':
 112                         howto |= RB_DUMP;
 113                         break;
 114                 case 'k':
 115                         kflag = 1;
 116                         kernel = optarg;
 117                         break;
 118 #endif
 119                 case 'l':
 120                         lflag = 1;
 121                         break;
 122                 case 'n':
 123                         nflag = 1;
 124                         howto |= RB_NOSYNC;
 125                         break;
 126 /* -p is irrelevant on OS X.  It does that anyway. */
 127 #ifndef __APPLE__
 128                 case 'p':
 129                         pflag = 1;
 130                         howto |= RB_POWEROFF;
 131                         break;
 132 #endif
 133                 case 'u':
 134                         uflag = 1;
 135                         howto |= RB_UPSDELAY;
 136                         break;
 137                 case 'q':
 138                         qflag = 1;
 139                         howto |= RB_QUICK;
 140                         break;
 141                 case '?':
 142                 default:
 143                         usage();
 144                 }
 145         argc -= optind;
 146         argv += optind;
 147
 148 #ifndef __APPLE__
 149         if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 150                 errx(1, "cannot dump (-d) when halting; must reboot instead");
 151 #endif
 152         if (geteuid()) {
 153                 errno = EPERM;
 154                 err(1, NULL);
 155         }
 156
 157 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
 158         if (!qflag && !lflag) { // shutdown(8) has already checked w/kextd
 159                 if ((errno = reserve_reboot()))
 160                         err(1, "couldn't lock for reboot");
 161         }
 162 #endif
 163
 164         if (qflag) {
 165                 reboot(howto);
 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 #if defined(__APPLE__)
 197         {
 198                 struct utmpx utx;
 199                 bzero(&utx, sizeof(utx));
 200                 utx.ut_type = SHUTDOWN_TIME;
 201                 gettimeofday(&utx.ut_tv, NULL);
 202                 pututxline(&utx);
 203         }
 204 #else
 205         logwtmp("~", "shutdown", "");
 206 #endif
 207
 208         /*
 209          * Do a sync early on, so disks start transfers while we're off
 210          * killing processes.  Don't worry about writes done before the
 211          * processes die, the reboot system call syncs the disks.
 212          */
 213         if (!nflag)
 214                 sync();
 215
 216 #ifndef __APPLE__
 217         /* Just stop init -- if we fail, we'll restart it. */
 218         if (kill(1, SIGTSTP) == -1)
 219                 err(1, "SIGTSTP init");
 220 #endif
 221
 222         /* Ignore the SIGHUP we get when our parent shell dies. */
 223         (void)signal(SIGHUP, SIG_IGN);
 224
 225 #ifndef __APPLE__
 226         /* Send a SIGTERM first, a chance to save the buffers. */
 227         if (kill(-1, SIGTERM) == -1)
 228                 err(1, "SIGTERM processes");
 229
 230         /*
 231          * After the processes receive the signal, start the rest of the
 232          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 233          * the SIGKILL to give everybody a chance. If there is a lot of
 234          * paging activity then wait longer, up to a maximum of approx
 235          * 60 seconds.
 236          */
 237         sleep(2);
 238         for (i = 0; i < 20; i++) {
 239                 pageins = get_pageins();
 240                 if (!nflag)
 241                         sync();
 242                 sleep(3);
 243                 if (get_pageins() == pageins)
 244                         break;
 245         }
 246
 247         for (i = 1;; ++i) {
 248                 if (kill(-1, SIGKILL) == -1) {
 249                         if (errno == ESRCH)
 250                                 break;
 251                         goto restart;
 252                 }
 253                 if (i > 5) {
 254                         (void)fprintf(stderr,
 255                             "WARNING: some process(es) wouldn't die\n");
 256                         break;
 257                 }
 258                 (void)sleep(2 * i);
 259         }
 260 #endif
 261
 262 #ifdef __APPLE__
 263         // launchd(8) handles reboot.  This call returns NULL on success.
 264         exit(reboot3(howto) == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
 265 #else /* __APPLE__ */
 266         reboot(howto);
 267         /* FALLTHROUGH */
 268
 269 restart:
 270         sverrno = errno;
 271         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 272             strerror(sverrno));
 273         /* NOTREACHED */
 274 #endif /* __APPLE__ */
 275 }
 276
 277 void
 278 usage(void)
 279 {
 280 #ifndef __APPLE__
 281         (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
 282 #else
 283         (void)fprintf(stderr, "usage: %s [-lnq]\n",
 284 #endif
 285             dohalt ? "halt" : "reboot");
 286         exit(1);
 287 }
 288
 289 u_int
 290 get_pageins(void)
 291 {
 292         u_int pageins;
 293         size_t len;
 294
 295         len = sizeof(pageins);
 296         if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
 297             != 0) {
 298                 warnx("v_swappgsin");
 299                 return (0);
 300         }
 301         return pageins;
 302 }
 303
 304 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
 305 // XX this routine is also in shutdown.tproj; it would be nice to share
 306
 307 static bool
 308 kextdDisabled(void)
 309 {
 310         uint32_t disabled = 0;
 311         size_t   sizeOfDisabled = sizeof(disabled);
 312         if (sysctlbyname("hw.use_kernelmanagerd", &disabled, &sizeOfDisabled, NULL, 0) != 0) {
 313                 return false;
 314         }
 315         return (disabled != 0);
 316 }
 317
 318 #define WAITFORLOCK 1
 319 /*
 320  * contact kextd to lock for reboot
 321  */
 322 int
 323 reserve_reboot(void)
 324 {
 325         int rval = ELAST + 1;
 326         kern_return_t macherr = KERN_FAILURE;
 327         mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 328         int busyStatus = ELAST + 1;
 329         mountpoint_t busyVol;
 330
 331         if (kextdDisabled()) {
 332                 /* no need to talk with kextd if it's not running */
 333                 return 0;
 334         }
 335
 336         macherr = bootstrap_look_up2(bootstrap_port, KEXTD_SERVER_NAME, &kxport, 0, BOOTSTRAP_PRIVILEGED_SERVER);
 337         if (macherr)  goto finish;
 338
 339         // allocate a port to pass to kextd (in case we die)
 340         tport = mach_task_self();
 341         if (tport == MACH_PORT_NULL)  goto finish;
 342         macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 343         if (macherr)  goto finish;
 344
 345         // try to lock for reboot
 346         macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 347                                       &busyStatus);
 348         if (macherr)  goto finish;
 349
 350         if (busyStatus == EBUSY) {
 351                 warnx("%s is busy updating; waiting for lock", busyVol);
 352                 macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 353                                                                                   busyVol, &busyStatus);
 354                 if (macherr)    goto finish;
 355         }
 356
 357         if (busyStatus == EALREADY) {
 358                 // reboot already in progress
 359                 rval = 0;
 360         } else {
 361                 rval = busyStatus;
 362         }
 363
 364 finish:
 365         // in general, we want to err on the side of allowing the reboot
 366         if (macherr) {
 367                 if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 368                         warnx("WARNING: couldn't lock kext manager for reboot: %s",
 369                                         mach_error_string(macherr));
 370                 rval = 0;
 371         }
 372         // unless we got the lock, clean up our port
 373         if (busyStatus != 0 && myport != MACH_PORT_NULL)
 374                 mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 375
 376         return rval;
 377 }
 378 #endif