shutdown.tproj/shutdown.c

   1 /*
   2  * Copyright (c) 1988, 1990, 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 #if 0
  32 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1988, 1990, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 static char sccsid[] = "@(#)shutdown.c  8.4 (Berkeley) 4/28/95";
  40 #endif /* not lint */
  41 #endif
  42 #include <sys/cdefs.h>
  43 #ifndef __APPLE__
  44 __FBSDID("$FreeBSD: src/sbin/shutdown/shutdown.c,v 1.28 2005/01/25 08:40:51 delphij Exp $");
  45 #endif
  46
  47 #include <sys/param.h>
  48 #include <sys/time.h>
  49 #include <sys/resource.h>
  50 #include <sys/syslog.h>
  51
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <fcntl.h>
  55 #include <paths.h>
  56 #include <pwd.h>
  57 #include <setjmp.h>
  58 #include <signal.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <unistd.h>
  63
  64 #ifdef __APPLE__
  65 #include <errno.h>
  66 #include <util.h>
  67 #include <bsm/libbsm.h>
  68 #include <bsm/audit_uevents.h>
  69 #include <sys/types.h>
  70 #include <sys/sysctl.h>
  71 #include <vproc.h>
  72 #include <vproc_priv.h>
  73
  74 #include "kextmanager.h"
  75 #include <IOKit/kext/kextmanager_types.h>
  76 #include <IOKit/pwr_mgt/IOPMLib.h>
  77 #include <mach/mach_port.h>             // allocate
  78 #include <mach/mach.h>                  // task_self, etc
  79 #include <servers/bootstrap.h>  // bootstrap
  80 #include <bootstrap_priv.h>
  81 #include <reboot2.h>
  82 #include <utmpx.h>
  83
  84 #include "pathnames.h"
  85 #endif /* __APPLE__ */
  86
  87 #ifdef DEBUG
  88 #undef _PATH_NOLOGIN
  89 #define _PATH_NOLOGIN   "./nologin"
  90 #endif
  91
  92 #define H               *60*60
  93 #define M               *60
  94 #define S               *1
  95 #define NOLOG_TIME      5*60
  96 struct interval {
  97         int timeleft, timetowait;
  98 } tlist[] = {
  99         { 10 H,  5 H },
 100         {  5 H,  3 H },
 101         {  2 H,  1 H },
 102         {  1 H, 30 M },
 103         { 30 M, 10 M },
 104         { 20 M, 10 M },
 105         { 10 M,  5 M },
 106         {  5 M,  3 M },
 107         {  2 M,  1 M },
 108         {  1 M, 30 S },
 109         { 30 S, 30 S },
 110         {  0  ,  0   }
 111 };
 112 #undef H
 113 #undef M
 114 #undef S
 115
 116 static time_t offset, shuttime;
 117 #ifdef __APPLE__
 118 static int dohalt, doreboot, doups, killflg, oflag;
 119 static size_t mbuflen;
 120 #else
 121 static int dohalt, dopower, doreboot, killflg, mbuflen, oflag;
 122 #endif
 123 static char mbuf[BUFSIZ];
 124 static const char *nosync, *whom;
 125 #ifdef __APPLE__
 126 static int dosleep;
 127 #endif
 128
 129 void badtime(void);
 130 #ifdef __APPLE__
 131 void log_and_exec_reboot_or_halt(void);
 132 #else
 133 void die_you_gravy_sucking_pig_dog(void);
 134 #endif
 135 void finish(int);
 136 void getoffset(char *);
 137 void loop(void);
 138 void nolog(void);
 139 void timeout(int);
 140 void timewarn(time_t);
 141 void usage(const char *);
 142 #ifdef __APPLE__
 143 int audit_shutdown(int);
 144 int reserve_reboot(void);
 145 #endif
 146
 147 extern const char **environ;
 148
 149 int
 150 main(int argc, char **argv)
 151 {
 152         char *p, *endp;
 153         struct passwd *pw;
 154         size_t arglen;
 155         int ch, len, readstdin;
 156
 157 #ifndef DEBUG
 158         if (geteuid())
 159                 errx(1, "NOT super-user");
 160 #endif
 161         nosync = NULL;
 162         readstdin = 0;
 163 #ifndef __APPLE__
 164         while ((ch = getopt(argc, argv, "-hknopr")) != -1)
 165 #else
 166         while ((ch = getopt(argc, argv, "-hknorsu")) != -1)
 167 #endif
 168                 switch (ch) {
 169                 case '-':
 170                         readstdin = 1;
 171                         break;
 172                 case 'h':
 173                         dohalt = 1;
 174                         break;
 175                 case 'k':
 176                         killflg = 1;
 177                         break;
 178                 case 'n':
 179                         nosync = "-n";
 180                         break;
 181                 case 'o':
 182                         oflag = 1;
 183                         break;
 184 #ifndef __APPLE__
 185                 case 'p':
 186                         dopower = 1;
 187                         break;
 188 #endif
 189         case 'u':
 190             doups = 1;
 191             break;
 192                 case 'r':
 193                         doreboot = 1;
 194                         break;
 195 #ifdef __APPLE__
 196                 case 's':
 197                         dosleep = 1;
 198                         break;
 199 #endif
 200                 case '?':
 201                 default:
 202                         usage((char *)NULL);
 203                 }
 204         argc -= optind;
 205         argv += optind;
 206
 207         if (argc < 1)
 208                 usage((char *)NULL);
 209
 210 #ifndef __APPLE__
 211         if (killflg + doreboot + dohalt + dopower > 1)
 212                 usage("incompatible switches -h, -k, -p and -r");
 213
 214         if (oflag && !(dohalt || dopower || doreboot))
 215                 usage("-o requires -h, -p or -r");
 216
 217         if (nosync != NULL && !oflag)
 218                 usage("-n requires -o");
 219 #else /* !__APPLE__ */
 220         if (killflg + doreboot + dohalt + dosleep > 1)
 221                 usage("incompatible switches -h, -k, -r, and -s");
 222
 223         if (!(dohalt || doreboot || dosleep || killflg))
 224                 usage("-h, -r, -s, or -k is required");
 225
 226         if (doups && !dohalt)
 227                 usage("-u requires -h");
 228 #endif /* !__APPLE__ */
 229
 230         getoffset(*argv++);
 231
 232         if (*argv) {
 233                 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
 234                         arglen = strlen(*argv);
 235                         if ((len -= arglen) <= 2)
 236                                 break;
 237                         if (p != mbuf)
 238                                 *p++ = ' ';
 239                         memmove(p, *argv, arglen);
 240                         p += arglen;
 241                 }
 242                 *p = '\n';
 243                 *++p = '\0';
 244         }
 245
 246         if (readstdin) {
 247                 p = mbuf;
 248                 endp = mbuf + sizeof(mbuf) - 2;
 249                 for (;;) {
 250                         if (!fgets(p, (int)(endp - p + 1), stdin))
 251                                 break;
 252                         for (; *p &&  p < endp; ++p);
 253                         if (p == endp) {
 254                                 *p = '\n';
 255                                 *++p = '\0';
 256                                 break;
 257                         }
 258                 }
 259         }
 260         mbuflen = strlen(mbuf);
 261
 262         if (offset)
 263                 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
 264         else
 265                 (void)printf("Shutdown NOW!\n");
 266
 267         if (!(whom = getlogin()))
 268                 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
 269
 270 #ifdef DEBUG
 271         audit_shutdown(0);
 272         (void)putc('\n', stdout);
 273 #else
 274         (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
 275 #ifdef __APPLE__
 276         if (offset) {
 277 #else
 278         {
 279 #endif
 280                 int forkpid;
 281
 282                 forkpid = fork();
 283                 if (forkpid == -1) {
 284                         audit_shutdown(1);
 285                         err(1, "fork");
 286                 }
 287                 if (forkpid)
 288                         errx(0, "[pid %d]", forkpid);
 289 #ifdef __APPLE__
 290                 /* 5863185: reboot2() needs to talk to launchd. */
 291                 if (_vprocmgr_detach_from_console(0) != NULL)
 292                         warnx("can't detach from console");
 293 #endif /* __APPLE__ */
 294         }
 295         audit_shutdown(0);
 296         setsid();
 297 #endif
 298         openlog("shutdown", LOG_CONS, LOG_AUTH);
 299         loop();
 300         return(0);
 301 }
 302
 303 void
 304 loop(void)
 305 {
 306         struct interval *tp;
 307         u_int sltime;
 308         int logged;
 309
 310         if (offset <= NOLOG_TIME) {
 311                 logged = 1;
 312                 nolog();
 313         }
 314         else
 315                 logged = 0;
 316         tp = tlist;
 317         if (tp->timeleft < offset)
 318                 (void)sleep((u_int)(offset - tp->timeleft));
 319         else {
 320                 while (tp->timeleft && offset < tp->timeleft)
 321                         ++tp;
 322                 /*
 323                  * Warn now, if going to sleep more than a fifth of
 324                  * the next wait time.
 325                  */
 326                 if ((sltime = (u_int)(offset - tp->timeleft))) {
 327                         if (sltime > (tp->timetowait / 5))
 328                                 timewarn(offset);
 329                         (void)sleep(sltime);
 330                 }
 331         }
 332         for (;; ++tp) {
 333                 timewarn(tp->timeleft);
 334                 if (!logged && tp->timeleft <= NOLOG_TIME) {
 335                         logged = 1;
 336                         nolog();
 337                 }
 338                 (void)sleep((u_int)tp->timetowait);
 339                 if (!tp->timeleft)
 340                         break;
 341         }
 342 #ifdef __APPLE__
 343         log_and_exec_reboot_or_halt();
 344 #else
 345         die_you_gravy_sucking_pig_dog();
 346 #endif
 347 }
 348
 349 static jmp_buf alarmbuf;
 350
 351 static const char *restricted_environ[] = {
 352         "PATH=" _PATH_STDPATH,
 353         NULL
 354 };
 355
 356 void
 357 timewarn(time_t timeleft)
 358 {
 359         static int first;
 360         static char hostname[MAXHOSTNAMELEN + 1];
 361         FILE *pf;
 362         char wcmd[MAXPATHLEN + 4];
 363
 364         /* wall is sometimes missing, e.g. on install media */
 365         if (access(_PATH_WALL, X_OK) == -1) return;
 366
 367         if (!first++)
 368                 (void)gethostname(hostname, sizeof(hostname));
 369
 370         /* undoc -n option to wall suppresses normal wall banner */
 371         (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
 372         environ = restricted_environ;
 373         if (!(pf = popen(wcmd, "w"))) {
 374                 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
 375                 return;
 376         }
 377
 378         (void)fprintf(pf,
 379             "\007*** %sSystem shutdown message from %s@%s ***\007\n",
 380             timeleft ? "": "FINAL ", whom, hostname);
 381
 382         if (timeleft > 10*60)
 383                 (void)fprintf(pf, "System going down at %5.5s\n\n",
 384                     ctime(&shuttime) + 11);
 385         else if (timeleft > 59)
 386                 (void)fprintf(pf, "System going down in %ld minute%s\n\n",
 387                     timeleft / 60, (timeleft > 60) ? "s" : "");
 388         else if (timeleft)
 389                 (void)fprintf(pf, "System going down in 30 seconds\n\n");
 390         else
 391                 (void)fprintf(pf, "System going down IMMEDIATELY\n\n");
 392
 393         if (mbuflen)
 394                 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
 395
 396         /*
 397          * play some games, just in case wall doesn't come back
 398          * probably unnecessary, given that wall is careful.
 399          */
 400         if (!setjmp(alarmbuf)) {
 401                 (void)signal(SIGALRM, timeout);
 402                 (void)alarm((u_int)30);
 403                 (void)pclose(pf);
 404                 (void)alarm((u_int)0);
 405                 (void)signal(SIGALRM, SIG_DFL);
 406         }
 407 }
 408
 409 void
 410 timeout(int signo __unused)
 411 {
 412         longjmp(alarmbuf, 1);
 413 }
 414
 415 void
 416 #ifdef __APPLE__
 417 log_and_exec_reboot_or_halt()
 418 #else
 419 die_you_gravy_sucking_pig_dog()
 420 #endif
 421 {
 422 #ifndef __APPLE__
 423         char *empty_environ[] = { NULL };
 424 #else
 425         if ((errno = reserve_reboot())) {
 426                 warn("couldn't lock for reboot");
 427                 finish(0);
 428         }
 429 #endif
 430
 431         syslog(LOG_NOTICE, "%s%s by %s: %s",
 432 #ifndef __APPLE__
 433             doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" :
 434 #else
 435             doreboot ? "reboot" : dohalt ? "halt" : dosleep ? "sleep" :
 436 #endif
 437             "shutdown", doups?" with UPS delay":"", whom, mbuf);
 438 #ifndef __APPLE__
 439         (void)sleep(2);
 440 #endif
 441
 442         (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
 443         if (killflg) {
 444                 (void)printf("\rbut you'll have to do it yourself\r\n");
 445                 exit(0);
 446         }
 447 #ifdef DEBUG
 448         if (doreboot)
 449                 (void)printf("reboot");
 450         else if (dohalt)
 451                 (void)printf("halt");
 452 #ifndef __APPLE__
 453         else if (dopower)
 454                 (void)printf("power-down");
 455         if (nosync != NULL)
 456                 (void)printf(" no sync");
 457 #else
 458         else if (dosleep)
 459                 (void)printf("sleep");
 460 #endif
 461         (void)printf("\nkill -HUP 1\n");
 462 #else
 463 #ifdef __APPLE__
 464         if (dosleep) {
 465                 mach_port_t mp;
 466                 io_connect_t fb;
 467                 kern_return_t kr = IOMasterPort(bootstrap_port, &mp);
 468                 if (kr == kIOReturnSuccess) {
 469                         fb = IOPMFindPowerManagement(mp);
 470                         if (fb != IO_OBJECT_NULL) {
 471                                 IOReturn err = IOPMSleepSystem(fb);
 472                                 if (err != kIOReturnSuccess) {
 473                                         fprintf(stderr, "shutdown: sleep failed (0x%08x)\n", err);
 474                                         kr = -1;
 475                                 }
 476                         }
 477                 }
 478         } else {
 479                 int howto = 0;
 480
 481 #if defined(__APPLE__)
 482                 {
 483                         struct utmpx utx;
 484                         bzero(&utx, sizeof(utx));
 485                         utx.ut_type = SHUTDOWN_TIME;
 486                         gettimeofday(&utx.ut_tv, NULL);
 487                         pututxline(&utx);
 488                 }
 489 #else
 490                 logwtmp("~", "shutdown", "");
 491 #endif
 492
 493                 if (dohalt) howto |= RB_HALT;
 494                 if (doups) howto |= RB_UPSDELAY;
 495                 if (nosync) howto |= RB_NOSYNC;
 496
 497                 // launchd(8) handles reboot.  This call returns NULL on success.
 498                 if (reboot3(howto)) {
 499                         syslog(LOG_ERR, "shutdown: launchd reboot failed.");
 500                 }
 501         }
 502 #else /* __APPLE__ */
 503         if (!oflag) {
 504                 (void)kill(1, doreboot ? SIGINT :       /* reboot */
 505                               dohalt ? SIGUSR1 :        /* halt */
 506                               dopower ? SIGUSR2 :       /* power-down */
 507                               SIGTERM);                 /* single-user */
 508         } else {
 509                 if (doreboot) {
 510                         execle(_PATH_REBOOT, "reboot", "-l", nosync,
 511                                 (char *)NULL, empty_environ);
 512                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 513                                 _PATH_REBOOT);
 514                         warn(_PATH_REBOOT);
 515                 }
 516                 else if (dohalt) {
 517                         execle(_PATH_HALT, "halt", "-l", nosync,
 518                                 (char *)NULL, empty_environ);
 519                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 520                                 _PATH_HALT);
 521                         warn(_PATH_HALT);
 522                 }
 523                 else if (dopower) {
 524                         execle(_PATH_HALT, "halt", "-l", "-p", nosync,
 525                                 (char *)NULL, empty_environ);
 526                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 527                                 _PATH_HALT);
 528                         warn(_PATH_HALT);
 529                 }
 530                 (void)kill(1, SIGTERM);         /* to single-user */
 531         }
 532 #endif /* __APPLE__ */
 533 #endif
 534         finish(0);
 535 }
 536
 537 #define ATOI2(p)        (p[0] - '0') * 10 + (p[1] - '0'); p += 2;
 538
 539 void
 540 getoffset(char *timearg)
 541 {
 542         struct tm *lt;
 543         char *p;
 544         time_t now;
 545         int this_year;
 546
 547         (void)time(&now);
 548
 549         if (!strcasecmp(timearg, "now")) {              /* now */
 550                 offset = 0;
 551                 shuttime = now;
 552                 return;
 553         }
 554
 555         if (*timearg == '+') {                          /* +minutes */
 556                 if (!isdigit(*++timearg))
 557                         badtime();
 558                 if ((offset = atoi(timearg) * 60) < 0)
 559                         badtime();
 560                 shuttime = now + offset;
 561                 return;
 562         }
 563
 564         /* handle hh:mm by getting rid of the colon */
 565         for (p = timearg; *p; ++p)
 566                 if (!isascii(*p) || !isdigit(*p)) {
 567                         if (*p == ':' && strlen(p) == 3) {
 568                                 p[0] = p[1];
 569                                 p[1] = p[2];
 570                                 p[2] = '\0';
 571                         }
 572                         else
 573                                 badtime();
 574                 }
 575
 576         unsetenv("TZ");                                 /* OUR timezone */
 577         lt = localtime(&now);                           /* current time val */
 578
 579         switch(strlen(timearg)) {
 580         case 10:
 581                 this_year = lt->tm_year;
 582                 lt->tm_year = ATOI2(timearg);
 583                 /*
 584                  * check if the specified year is in the next century.
 585                  * allow for one year of user error as many people will
 586                  * enter n - 1 at the start of year n.
 587                  */
 588                 if (lt->tm_year < (this_year % 100) - 1)
 589                         lt->tm_year += 100;
 590                 /* adjust for the year 2000 and beyond */
 591                 lt->tm_year += (this_year - (this_year % 100));
 592                 /* FALLTHROUGH */
 593         case 8:
 594                 lt->tm_mon = ATOI2(timearg);
 595                 if (--lt->tm_mon < 0 || lt->tm_mon > 11)
 596                         badtime();
 597                 /* FALLTHROUGH */
 598         case 6:
 599                 lt->tm_mday = ATOI2(timearg);
 600                 if (lt->tm_mday < 1 || lt->tm_mday > 31)
 601                         badtime();
 602                 /* FALLTHROUGH */
 603         case 4:
 604                 lt->tm_hour = ATOI2(timearg);
 605                 if (lt->tm_hour < 0 || lt->tm_hour > 23)
 606                         badtime();
 607                 lt->tm_min = ATOI2(timearg);
 608                 if (lt->tm_min < 0 || lt->tm_min > 59)
 609                         badtime();
 610                 lt->tm_sec = 0;
 611                 if ((shuttime = mktime(lt)) == -1)
 612                         badtime();
 613                 if ((offset = shuttime - now) < 0)
 614                         errx(1, "that time is already past.");
 615                 break;
 616         default:
 617                 badtime();
 618         }
 619 }
 620
 621 #define NOMSG   "\n\nNO LOGINS: System going down at "
 622 void
 623 nolog(void)
 624 {
 625         int logfd;
 626         char *ct;
 627
 628         (void)unlink(_PATH_NOLOGIN);    /* in case linked to another file */
 629         (void)signal(SIGINT, finish);
 630         (void)signal(SIGHUP, finish);
 631         (void)signal(SIGQUIT, finish);
 632         (void)signal(SIGTERM, finish);
 633         if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
 634             0664)) >= 0) {
 635                 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
 636                 ct = ctime(&shuttime);
 637                 (void)write(logfd, ct + 11, 5);
 638                 (void)write(logfd, "\n\n", 2);
 639                 (void)write(logfd, mbuf, strlen(mbuf));
 640                 (void)close(logfd);
 641         }
 642 }
 643
 644 void
 645 finish(int signo __unused)
 646 {
 647         if (!killflg)
 648                 (void)unlink(_PATH_NOLOGIN);
 649         exit(0);
 650 }
 651
 652 void
 653 badtime(void)
 654 {
 655         errx(1, "bad time format");
 656 }
 657
 658 void
 659 usage(const char *cp)
 660 {
 661         if (cp != NULL)
 662                 warnx("%s", cp);
 663         (void)fprintf(stderr,
 664 #ifdef __APPLE__
 665             "usage: shutdown [-] [-h [-u] [-n] | -r [-n] | -s | -k]"
 666 #else
 667             "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]]"
 668 #endif
 669             " time [warning-message ...]\n");
 670         exit(1);
 671 }
 672
 673 #ifdef __APPLE__
 674 /*
 675  * The following tokens are included in the audit record for shutdown
 676  * header
 677  * subject
 678  * return
 679  */
 680 int
 681 audit_shutdown(int exitstatus)
 682 {
 683         int aufd;
 684         token_t *tok;
 685         long au_cond;
 686
 687         /* If we are not auditing, don't cut an audit record; just return */
 688         if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
 689                 fprintf(stderr, "shutdown: Could not determine audit condition\n");
 690                 return 0;
 691         }
 692         if (au_cond == AUC_NOAUDIT)
 693                 return 0;
 694
 695         if((aufd = au_open()) == -1) {
 696                 fprintf(stderr, "shutdown: Audit Error: au_open() failed\n");
 697                 exit(1);
 698         }
 699
 700         /* The subject that performed the operation */
 701         if((tok = au_to_me()) == NULL) {
 702                 fprintf(stderr, "shutdown: Audit Error: au_to_me() failed\n");
 703                 exit(1);
 704         }
 705         au_write(aufd, tok);
 706
 707         /* success and failure status */
 708         if((tok = au_to_return32(exitstatus, errno)) == NULL) {
 709                 fprintf(stderr, "shutdown: Audit Error: au_to_return32() failed\n");
 710                 exit(1);
 711         }
 712         au_write(aufd, tok);
 713
 714         if(au_close(aufd, 1, AUE_shutdown) == -1) {
 715                 fprintf(stderr, "shutdown: Audit Error: au_close() failed\n");
 716                 exit(1);
 717         }
 718         return 1;
 719 }
 720
 721
 722 static bool
 723 kextdDisabled(void)
 724 {
 725         uint32_t disabled = 0;
 726         size_t   sizeOfDisabled = sizeof(disabled);
 727         if (sysctlbyname("hw.use_kernelmanagerd", &disabled, &sizeOfDisabled, NULL, 0) != 0) {
 728                 return false;
 729         }
 730         return (disabled != 0);
 731 }
 732
 733
 734 // XX copied from reboot.tproj/reboot.c; it would be nice to share the code
 735
 736 #define WAITFORLOCK 1
 737 /*
 738  * contact kextd to lock for reboot
 739  */
 740 int
 741 reserve_reboot(void)
 742 {
 743     int rval = ELAST + 1;
 744     kern_return_t macherr = KERN_FAILURE;
 745     mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 746     int busyStatus = ELAST + 1;
 747     mountpoint_t busyVol;
 748
 749     if (kextdDisabled()) {
 750         /* no need to talk with kextd if it's not running */
 751         return 0;
 752     }
 753
 754     macherr = bootstrap_look_up2(bootstrap_port, KEXTD_SERVER_NAME, &kxport, 0, BOOTSTRAP_PRIVILEGED_SERVER);
 755     if (macherr)  goto finish;
 756
 757     // allocate a port to pass to kextd (in case we die)
 758     tport = mach_task_self();
 759     if (tport == MACH_PORT_NULL)  goto finish;
 760     macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 761     if (macherr)  goto finish;
 762
 763     // try to lock for reboot
 764     macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 765                                       &busyStatus);
 766     if (macherr)  goto finish;
 767
 768     if (busyStatus == EBUSY) {
 769         warnx("%s is busy updating; waiting for lock", busyVol);
 770         macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 771                                           busyVol, &busyStatus);
 772         if (macherr)    goto finish;
 773     }
 774
 775     if (busyStatus == EALREADY) {
 776         // reboot already in progress
 777         rval = 0;
 778     } else {
 779         rval = busyStatus;
 780     }
 781
 782 finish:
 783     // in general, we want to err on the side of allowing the reboot
 784     if (macherr) {
 785         if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 786             warnx("WARNING: couldn't lock kext manager for reboot: %s",
 787                     mach_error_string(macherr));
 788         rval = 0;
 789     }
 790     // unless we got the lock, clean up our port
 791     if (busyStatus != 0 && myport != MACH_PORT_NULL)
 792         mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 793
 794     return rval;
 795 }
 796 #endif /* __APPLE__ */