scheduler/main.c

   1 /*
   2  * Main loop for the CUPS scheduler.
   3  *
   4  * Copyright 2007-2016 by Apple Inc.
   5  * Copyright 1997-2007 by Easy Software Products, all rights reserved.
   6  *
   7  * These coded instructions, statements, and computer programs are the
   8  * property of Apple Inc. and are protected by Federal copyright
   9  * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  10  * "LICENSE" which should have been included with this file.  If this
  11  * file is missing or damaged, see the license at "http://www.cups.org/".
  12  */
  13
  14 /*
  15  * Include necessary headers...
  16  */
  17
  18 #define _MAIN_C_
  19 #include "cupsd.h"
  20 #include <sys/resource.h>
  21 #ifdef HAVE_ASL_H
  22 #  include <asl.h>
  23 #elif defined(HAVE_SYSTEMD_SD_JOURNAL_H)
  24 #  define SD_JOURNAL_SUPPRESS_LOCATION
  25 #  include <systemd/sd-journal.h>
  26 #endif /* HAVE_ASL_H */
  27 #include <syslog.h>
  28 #include <grp.h>
  29
  30 #ifdef HAVE_LAUNCH_H
  31 #  include <launch.h>
  32 #endif /* HAVE_LAUNCH_H */
  33
  34 #ifdef HAVE_SYSTEMD
  35 #  include <systemd/sd-daemon.h>
  36 #endif /* HAVE_SYSTEMD */
  37
  38 #ifdef HAVE_ONDEMAND
  39 #  define CUPS_KEEPALIVE CUPS_CACHEDIR "/org.cups.cupsd"
  40                                         /* Name of the KeepAlive file */
  41 #endif
  42
  43 #if defined(HAVE_MALLOC_H) && defined(HAVE_MALLINFO)
  44 #  include <malloc.h>
  45 #endif /* HAVE_MALLOC_H && HAVE_MALLINFO */
  46
  47 #ifdef HAVE_NOTIFY_H
  48 #  include <notify.h>
  49 #endif /* HAVE_NOTIFY_H */
  50
  51 #ifdef HAVE_DBUS
  52 #  include <dbus/dbus.h>
  53 #endif /* HAVE_DBUS */
  54
  55 #ifdef HAVE_SYS_PARAM_H
  56 #  include <sys/param.h>
  57 #endif /* HAVE_SYS_PARAM_H */
  58
  59
  60 /*
  61  * Local functions...
  62  */
  63
  64 static void             parent_handler(int sig);
  65 static void             process_children(void);
  66 static void             sigchld_handler(int sig);
  67 static void             sighup_handler(int sig);
  68 static void             sigterm_handler(int sig);
  69 static long             select_timeout(int fds);
  70 #ifdef HAVE_ONDEMAND
  71 static void             service_checkin(void);
  72 static void             service_checkout(void);
  73 #endif /* HAVE_ONDEMAND */
  74 static void             usage(int status) __attribute__((noreturn));
  75
  76
  77 /*
  78  * Local globals...
  79  */
  80
  81 static int              parent_signal = 0;
  82                                         /* Set to signal number from child */
  83 static int              holdcount = 0;  /* Number of times "hold" was called */
  84 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
  85 static sigset_t         holdmask;       /* Old POSIX signal mask */
  86 #endif /* HAVE_SIGACTION && !HAVE_SIGSET */
  87 static int              dead_children = 0;
  88                                         /* Dead children? */
  89 static int              stop_scheduler = 0;
  90                                         /* Should the scheduler stop? */
  91
  92
  93 /*
  94  * 'main()' - Main entry for the CUPS scheduler.
  95  */
  96
  97 int                                     /* O - Exit status */
  98 main(int  argc,                         /* I - Number of command-line args */
  99      char *argv[])                      /* I - Command-line arguments */
 100 {
 101   int                   i;              /* Looping var */
 102   char                  *opt;           /* Option character */
 103   int                   close_all = 1,  /* Close all file descriptors? */
 104                         disconnect = 1, /* Disconnect from controlling terminal? */
 105                         fg = 0,         /* Run in foreground? */
 106                         run_as_child = 0,
 107                                         /* Running as child process? */
 108                         print_profile = 0;
 109                                         /* Print the sandbox profile to stdout? */
 110   int                   fds;            /* Number of ready descriptors */
 111   cupsd_client_t        *con;           /* Current client */
 112   cupsd_job_t           *job;           /* Current job */
 113   cupsd_listener_t      *lis;           /* Current listener */
 114   time_t                current_time,   /* Current time */
 115                         activity,       /* Client activity timer */
 116                         senddoc_time,   /* Send-Document time */
 117                         expire_time,    /* Subscription expire time */
 118                         report_time,    /* Malloc/client/job report time */
 119                         event_time;     /* Last event notification time */
 120   long                  timeout;        /* Timeout for cupsdDoSelect() */
 121   struct rlimit         limit;          /* Runtime limit */
 122 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
 123   struct sigaction      action;         /* Actions for POSIX signals */
 124 #endif /* HAVE_SIGACTION && !HAVE_SIGSET */
 125 #ifdef __APPLE__
 126   int                   use_sysman = 1; /* Use system management functions? */
 127 #else
 128   time_t                netif_time = 0; /* Time since last network update */
 129 #endif /* __APPLE__ */
 130 #if defined(HAVE_ONDEMAND)
 131   int                   service_idle_exit;
 132                                         /* Idle exit on select timeout? */
 133 #endif /* HAVE_ONDEMAND */
 134
 135
 136 #ifdef HAVE_GETEUID
 137  /*
 138   * Check for setuid invocation, which we do not support!
 139   */
 140
 141   if (getuid() != geteuid())
 142   {
 143     fputs("cupsd: Cannot run as a setuid program.\n", stderr);
 144     return (1);
 145   }
 146 #endif /* HAVE_GETEUID */
 147
 148  /*
 149   * Check for command-line arguments...
 150   */
 151
 152   fg = 0;
 153
 154 #ifdef HAVE_LAUNCHD
 155   if (getenv("CUPSD_LAUNCHD"))
 156   {
 157     OnDemand   = 1;
 158     fg         = 1;
 159     close_all  = 0;
 160     disconnect = 0;
 161   }
 162 #endif /* HAVE_LAUNCHD */
 163
 164   for (i = 1; i < argc; i ++)
 165     if (argv[i][0] == '-')
 166       for (opt = argv[i] + 1; *opt != '\0'; opt ++)
 167         switch (*opt)
 168         {
 169           case 'C' : /* Run as child with config file */
 170               run_as_child = 1;
 171               fg           = 1;
 172               close_all    = 0;
 173
 174           case 'c' : /* Configuration file */
 175               i ++;
 176               if (i >= argc)
 177               {
 178                 _cupsLangPuts(stderr, _("cupsd: Expected config filename "
 179                                         "after \"-c\" option."));
 180                 usage(1);
 181               }
 182
 183               if (argv[i][0] == '/')
 184               {
 185                /*
 186                 * Absolute directory...
 187                 */
 188
 189                 cupsdSetString(&ConfigurationFile, argv[i]);
 190               }
 191               else
 192               {
 193                /*
 194                 * Relative directory...
 195                 */
 196
 197                 char *current;          /* Current directory */
 198
 199                /*
 200                 * Allocate a buffer for the current working directory to
 201                 * reduce run-time stack usage; this approximates the
 202                 * behavior of some implementations of getcwd() when they
 203                 * are passed a NULL pointer.
 204                 */
 205
 206                 if ((current = malloc(1024)) == NULL)
 207                 {
 208                   _cupsLangPuts(stderr,
 209                                 _("cupsd: Unable to get current directory."));
 210                   return (1);
 211                 }
 212
 213                 if (!getcwd(current, 1024))
 214                 {
 215                   _cupsLangPuts(stderr,
 216                                 _("cupsd: Unable to get current directory."));
 217                   free(current);
 218                   return (1);
 219                 }
 220
 221                 cupsdSetStringf(&ConfigurationFile, "%s/%s", current, argv[i]);
 222                 free(current);
 223               }
 224               break;
 225
 226           case 'f' : /* Run in foreground... */
 227               fg         = 1;
 228               disconnect = 0;
 229               close_all  = 0;
 230               break;
 231
 232           case 'F' : /* Run in foreground, but disconnect from terminal... */
 233               fg        = 1;
 234               close_all = 0;
 235               break;
 236
 237           case 'h' : /* Show usage/help */
 238               usage(0);
 239               break;
 240
 241           case 'l' : /* Started by launchd/systemd/upstart... */
 242 #if defined(HAVE_ONDEMAND)
 243               OnDemand   = 1;
 244               fg         = 1;
 245               close_all  = 0;
 246               disconnect = 0;
 247 #else
 248               _cupsLangPuts(stderr, _("cupsd: On-demand support not compiled "
 249                                       "in, running in normal mode."));
 250               fg         = 0;
 251               disconnect = 1;
 252               close_all  = 1;
 253 #endif /* HAVE_ONDEMAND */
 254               break;
 255
 256           case 'p' : /* Stop immediately for profiling */
 257               fputs("cupsd: -p (startup profiling) is for internal testing "
 258                     "use only!\n", stderr);
 259               stop_scheduler = 1;
 260               fg             = 1;
 261               disconnect     = 0;
 262               close_all      = 0;
 263               break;
 264
 265           case 'P' : /* Disable security profiles */
 266               fputs("cupsd: -P (disable sandboxing) is for internal testing use only.\n", stderr);
 267               UseSandboxing = 0;
 268               break;
 269
 270           case 's' : /* Set cups-files.conf location */
 271               i ++;
 272               if (i >= argc)
 273               {
 274                 _cupsLangPuts(stderr, _("cupsd: Expected cups-files.conf "
 275                                         "filename after \"-s\" option."));
 276                 usage(1);
 277               }
 278
 279               if (argv[i][0] != '/')
 280               {
 281                /*
 282                 * Relative filename not allowed...
 283                 */
 284
 285                 _cupsLangPuts(stderr, _("cupsd: Relative cups-files.conf "
 286                                         "filename not allowed."));
 287                 usage(1);
 288               }
 289
 290               cupsdSetString(&CupsFilesFile, argv[i]);
 291               break;
 292
 293 #ifdef __APPLE__
 294           case 'S' : /* Disable system management functions */
 295               fputs("cupsd: -S (disable system management) for internal "
 296                     "testing use only!\n", stderr);
 297               use_sysman = 0;
 298               break;
 299 #endif /* __APPLE__ */
 300
 301           case 't' : /* Test the cupsd.conf file... */
 302               TestConfigFile = 1;
 303               fg             = 1;
 304               disconnect     = 0;
 305               close_all      = 0;
 306               break;
 307
 308           case 'T' : /* Print security profile */
 309               print_profile = 1;
 310               fg            = 1;
 311               disconnect    = 0;
 312               close_all     = 0;
 313               break;
 314
 315           default : /* Unknown option */
 316               _cupsLangPrintf(stderr, _("cupsd: Unknown option \"%c\" - "
 317                                         "aborting."), *opt);
 318               usage(1);
 319               break;
 320         }
 321     else
 322     {
 323       _cupsLangPrintf(stderr, _("cupsd: Unknown argument \"%s\" - aborting."),
 324                       argv[i]);
 325       usage(1);
 326     }
 327
 328   if (!ConfigurationFile)
 329     cupsdSetString(&ConfigurationFile, CUPS_SERVERROOT "/cupsd.conf");
 330
 331   if (!CupsFilesFile)
 332   {
 333     char        *filename,              /* Copy of cupsd.conf filename */
 334                 *slash;                 /* Final slash in cupsd.conf filename */
 335     size_t      len;                    /* Size of buffer */
 336
 337     len = strlen(ConfigurationFile) + 15;
 338     if ((filename = malloc(len)) == NULL)
 339     {
 340       _cupsLangPrintf(stderr,
 341                       _("cupsd: Unable to get path to "
 342                         "cups-files.conf file."));
 343       return (1);
 344     }
 345
 346     strlcpy(filename, ConfigurationFile, len);
 347     if ((slash = strrchr(filename, '/')) == NULL)
 348     {
 349       _cupsLangPrintf(stderr,
 350                       _("cupsd: Unable to get path to "
 351                         "cups-files.conf file."));
 352       return (1);
 353     }
 354
 355     strlcpy(slash, "/cups-files.conf", len - (size_t)(slash - filename));
 356     cupsdSetString(&CupsFilesFile, filename);
 357     free(filename);
 358   }
 359
 360   if (disconnect)
 361   {
 362    /*
 363     * Make sure we aren't tying up any filesystems...
 364     */
 365
 366     chdir("/");
 367
 368    /*
 369     * Disconnect from the controlling terminal...
 370     */
 371
 372     setsid();
 373   }
 374
 375   if (close_all)
 376   {
 377    /*
 378     * Close all open files...
 379     */
 380
 381     getrlimit(RLIMIT_NOFILE, &limit);
 382
 383     for (i = 0; i < (int)limit.rlim_cur && i < 1024; i ++)
 384       close(i);
 385
 386    /*
 387     * Redirect stdin/out/err to /dev/null...
 388     */
 389
 390     if ((i = open("/dev/null", O_RDONLY)) != 0)
 391     {
 392       dup2(i, 0);
 393       close(i);
 394     }
 395
 396     if ((i = open("/dev/null", O_WRONLY)) != 1)
 397     {
 398       dup2(i, 1);
 399       close(i);
 400     }
 401
 402     if ((i = open("/dev/null", O_WRONLY)) != 2)
 403     {
 404       dup2(i, 2);
 405       close(i);
 406     }
 407   }
 408   else
 409     LogStderr = cupsFileStderr();
 410
 411  /*
 412   * Run in the background as needed...
 413   */
 414
 415   if (!fg)
 416   {
 417    /*
 418     * Setup signal handlers for the parent...
 419     */
 420
 421 #ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
 422     sigset(SIGUSR1, parent_handler);
 423     sigset(SIGCHLD, parent_handler);
 424
 425     sigset(SIGHUP, SIG_IGN);
 426 #elif defined(HAVE_SIGACTION)
 427     memset(&action, 0, sizeof(action));
 428     sigemptyset(&action.sa_mask);
 429     sigaddset(&action.sa_mask, SIGUSR1);
 430     action.sa_handler = parent_handler;
 431     sigaction(SIGUSR1, &action, NULL);
 432     sigaction(SIGCHLD, &action, NULL);
 433
 434     sigemptyset(&action.sa_mask);
 435     action.sa_handler = SIG_IGN;
 436     sigaction(SIGHUP, &action, NULL);
 437 #else
 438     signal(SIGUSR1, parent_handler);
 439     signal(SIGCLD, parent_handler);
 440
 441     signal(SIGHUP, SIG_IGN);
 442 #endif /* HAVE_SIGSET */
 443
 444     if (fork() > 0)
 445     {
 446      /*
 447       * OK, wait for the child to startup and send us SIGUSR1 or to crash
 448       * and the OS send us SIGCHLD...  We also need to ignore SIGHUP which
 449       * might be sent by the init script to restart the scheduler...
 450       */
 451
 452       for (; parent_signal == 0;)
 453         sleep(1);
 454
 455       if (parent_signal == SIGUSR1)
 456         return (0);
 457
 458       if (wait(&i) < 0)
 459       {
 460         perror("cupsd");
 461         return (1);
 462       }
 463       else if (WIFEXITED(i))
 464       {
 465         fprintf(stderr, "cupsd: Child exited with status %d\n",
 466                 WEXITSTATUS(i));
 467         return (2);
 468       }
 469       else
 470       {
 471         fprintf(stderr, "cupsd: Child exited on signal %d\n", WTERMSIG(i));
 472         return (3);
 473       }
 474     }
 475
 476 #if defined(__OpenBSD__) && OpenBSD < 201211
 477    /*
 478     * Call _thread_sys_closefrom() so the child process doesn't reset the
 479     * parent's file descriptors to be blocking.  This is a workaround for a
 480     * limitation of userland libpthread on older versions of OpenBSD.
 481     */
 482
 483     _thread_sys_closefrom(0);
 484 #endif /* __OpenBSD__ && OpenBSD < 201211 */
 485
 486    /*
 487     * Since many system libraries create fork-unsafe data on execution of a
 488     * program, we need to re-execute the background cupsd with the "-C" and "-s"
 489     * options to avoid problems.  Unfortunately, we also have to assume that
 490     * argv[0] contains the name of the cupsd executable - there is no portable
 491     * way to get the real pathname...
 492     */
 493
 494     execlp(argv[0], argv[0], "-C", ConfigurationFile, "-s", CupsFilesFile, (char *)0);
 495     exit(errno);
 496   }
 497
 498  /*
 499   * Set the timezone info...
 500   */
 501
 502   tzset();
 503
 504 #ifdef LC_TIME
 505   setlocale(LC_TIME, "");
 506 #endif /* LC_TIME */
 507
 508 #ifdef HAVE_DBUS_THREADS_INIT
 509  /*
 510   * Enable threading support for D-BUS...
 511   */
 512
 513   dbus_threads_init_default();
 514 #endif /* HAVE_DBUS_THREADS_INIT */
 515
 516  /*
 517   * Set the maximum number of files...
 518   */
 519
 520   getrlimit(RLIMIT_NOFILE, &limit);
 521
 522 #if !defined(HAVE_POLL) && !defined(HAVE_EPOLL) && !defined(HAVE_KQUEUE)
 523   if (limit.rlim_max > FD_SETSIZE)
 524     MaxFDs = FD_SETSIZE;
 525   else
 526 #endif /* !HAVE_POLL && !HAVE_EPOLL && !HAVE_KQUEUE */
 527 #ifdef RLIM_INFINITY
 528   if (limit.rlim_max == RLIM_INFINITY)
 529     MaxFDs = 16384;
 530   else
 531 #endif /* RLIM_INFINITY */
 532     MaxFDs = limit.rlim_max;
 533
 534   limit.rlim_cur = (rlim_t)MaxFDs;
 535
 536   setrlimit(RLIMIT_NOFILE, &limit);
 537
 538   cupsdStartSelect();
 539
 540  /*
 541   * Read configuration...
 542   */
 543
 544   if (!cupsdReadConfiguration())
 545     return (1);
 546   else if (TestConfigFile)
 547   {
 548     printf("\"%s\" is OK.\n", CupsFilesFile);
 549     printf("\"%s\" is OK.\n", ConfigurationFile);
 550     return (0);
 551   }
 552   else if (print_profile)
 553   {
 554     cups_file_t *fp;                    /* File pointer */
 555     const char  *profile = cupsdCreateProfile(42, 0);
 556                                         /* Profile */
 557     char        line[1024];             /* Line from file */
 558
 559
 560     if ((fp = cupsFileOpen(profile, "r")) == NULL)
 561     {
 562       printf("Unable to open profile file \"%s\": %s\n", profile ? profile : "(null)", strerror(errno));
 563       return (1);
 564     }
 565
 566     while (cupsFileGets(fp, line, sizeof(line)))
 567       puts(line);
 568
 569     cupsFileClose(fp);
 570
 571     return (0);
 572   }
 573
 574  /*
 575   * Clean out old temp files and printer cache data.
 576   */
 577
 578   if (!strncmp(TempDir, RequestRoot, strlen(RequestRoot)))
 579     cupsdCleanFiles(TempDir, NULL);
 580
 581   cupsdCleanFiles(CacheDir, "*.ipp");
 582
 583 #if defined(HAVE_ONDEMAND)
 584   if (OnDemand)
 585   {
 586    /*
 587     * If we were started on demand by launchd or systemd get the listen sockets
 588     * file descriptors...
 589     */
 590
 591     service_checkin();
 592     service_checkout();
 593   }
 594 #endif /* HAVE_ONDEMAND */
 595
 596  /*
 597   * Startup the server...
 598   */
 599
 600   httpInitialize();
 601
 602   cupsdStartServer();
 603
 604  /*
 605   * Catch hangup and child signals and ignore broken pipes...
 606   */
 607
 608 #ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
 609   sigset(SIGCHLD, sigchld_handler);
 610   sigset(SIGHUP, sighup_handler);
 611   sigset(SIGPIPE, SIG_IGN);
 612   sigset(SIGTERM, sigterm_handler);
 613 #elif defined(HAVE_SIGACTION)
 614   memset(&action, 0, sizeof(action));
 615
 616   sigemptyset(&action.sa_mask);
 617   sigaddset(&action.sa_mask, SIGTERM);
 618   sigaddset(&action.sa_mask, SIGCHLD);
 619   action.sa_handler = sigchld_handler;
 620   sigaction(SIGCHLD, &action, NULL);
 621
 622   sigemptyset(&action.sa_mask);
 623   sigaddset(&action.sa_mask, SIGHUP);
 624   action.sa_handler = sighup_handler;
 625   sigaction(SIGHUP, &action, NULL);
 626
 627   sigemptyset(&action.sa_mask);
 628   action.sa_handler = SIG_IGN;
 629   sigaction(SIGPIPE, &action, NULL);
 630
 631   sigemptyset(&action.sa_mask);
 632   sigaddset(&action.sa_mask, SIGTERM);
 633   sigaddset(&action.sa_mask, SIGCHLD);
 634   action.sa_handler = sigterm_handler;
 635   sigaction(SIGTERM, &action, NULL);
 636 #else
 637   signal(SIGCLD, sigchld_handler);      /* No, SIGCLD isn't a typo... */
 638   signal(SIGHUP, sighup_handler);
 639   signal(SIGPIPE, SIG_IGN);
 640   signal(SIGTERM, sigterm_handler);
 641 #endif /* HAVE_SIGSET */
 642
 643  /*
 644   * Initialize authentication certificates...
 645   */
 646
 647   cupsdInitCerts();
 648
 649  /*
 650   * If we are running in the background, signal the parent process that
 651   * we are up and running...
 652   */
 653
 654   if (!fg || run_as_child)
 655   {
 656    /*
 657     * Send a signal to the parent process, but only if the parent is
 658     * not PID 1 (init).  This avoids accidentally shutting down the
 659     * system on OpenBSD if you CTRL-C the server before it is up...
 660     */
 661
 662     i = getppid();      /* Save parent PID to avoid race condition */
 663
 664     if (i != 1)
 665       kill(i, SIGUSR1);
 666   }
 667
 668 #ifdef __APPLE__
 669  /*
 670   * Start power management framework...
 671   */
 672
 673   if (use_sysman)
 674     cupsdStartSystemMonitor();
 675 #endif /* __APPLE__ */
 676
 677  /*
 678   * Send server-started event...
 679   */
 680
 681 #if defined(HAVE_ONDEMAND)
 682   if (OnDemand)
 683     cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started on demand.");
 684   else
 685 #endif /* HAVE_ONDEMAND */
 686   if (fg)
 687     cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started in foreground.");
 688   else
 689     cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started in background.");
 690
 691  /*
 692   * Start any pending print jobs...
 693   */
 694
 695   cupsdCheckJobs();
 696
 697  /*
 698   * Loop forever...
 699   */
 700
 701   current_time  = time(NULL);
 702   event_time    = current_time;
 703   expire_time   = current_time;
 704   fds           = 1;
 705   report_time   = 0;
 706   senddoc_time  = current_time;
 707
 708   while (!stop_scheduler)
 709   {
 710    /*
 711     * Check if there are dead children to handle...
 712     */
 713
 714     if (dead_children)
 715       process_children();
 716
 717    /*
 718     * Check if we need to load the server configuration file...
 719     */
 720
 721     if (NeedReload)
 722     {
 723      /*
 724       * Close any idle clients...
 725       */
 726
 727       if (cupsArrayCount(Clients) > 0)
 728       {
 729         for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
 730              con;
 731              con = (cupsd_client_t *)cupsArrayNext(Clients))
 732           if (httpGetState(con->http) == HTTP_WAITING)
 733             cupsdCloseClient(con);
 734           else
 735             con->http->keep_alive = HTTP_KEEPALIVE_OFF;
 736
 737         cupsdPauseListening();
 738       }
 739
 740      /*
 741       * Restart if all clients are closed and all jobs finished, or
 742       * if the reload timeout has elapsed...
 743       */
 744
 745       if ((cupsArrayCount(Clients) == 0 &&
 746            (cupsArrayCount(PrintingJobs) == 0 || NeedReload != RELOAD_ALL)) ||
 747           (time(NULL) - ReloadTime) >= ReloadTimeout)
 748       {
 749        /*
 750         * Shutdown the server...
 751         */
 752
 753 #ifdef HAVE_ONDEMAND
 754         if (OnDemand)
 755           break;
 756 #endif /* HAVE_ONDEMAND */
 757
 758         DoingShutdown = 1;
 759
 760         cupsdStopServer();
 761
 762        /*
 763         * Read configuration...
 764         */
 765
 766         if (!cupsdReadConfiguration())
 767         {
 768 #ifdef HAVE_SYSTEMD_SD_JOURNAL_H
 769           sd_journal_print(LOG_ERR, "Unable to read configuration file \"%s\" - exiting.", ConfigurationFile);
 770 #else
 771           syslog(LOG_LPR, "Unable to read configuration file \'%s\' - exiting.", ConfigurationFile);
 772 #endif /* HAVE_SYSTEMD_SD_JOURNAL_H */
 773
 774           break;
 775         }
 776
 777        /*
 778         * Startup the server...
 779         */
 780
 781         DoingShutdown = 0;
 782
 783         cupsdStartServer();
 784
 785        /*
 786         * Send a server-restarted event...
 787         */
 788
 789         cupsdAddEvent(CUPSD_EVENT_SERVER_RESTARTED, NULL, NULL,
 790                       "Scheduler restarted.");
 791       }
 792     }
 793
 794    /*
 795     * Check for available input or ready output.  If cupsdDoSelect()
 796     * returns 0 or -1, something bad happened and we should exit
 797     * immediately.
 798     *
 799     * Note that we at least have one listening socket open at all
 800     * times.
 801     */
 802
 803     if ((timeout = select_timeout(fds)) > 1 && LastEvent)
 804       timeout = 1;
 805
 806 #ifdef HAVE_ONDEMAND
 807    /*
 808     * If no other work is scheduled and we're being controlled by
 809     * launchd then timeout after 'LaunchdTimeout' seconds of
 810     * inactivity...
 811     */
 812
 813     if (timeout == 86400 && OnDemand && IdleExitTimeout &&
 814         !cupsArrayCount(ActiveJobs) &&
 815 #  ifdef HAVE_SYSTEMD
 816         !WebInterface &&
 817 #  endif /* HAVE_SYSTEMD */
 818         (!Browsing || !BrowseLocalProtocols || !cupsArrayCount(Printers)))
 819     {
 820       timeout           = IdleExitTimeout;
 821       service_idle_exit = 1;
 822     }
 823     else
 824       service_idle_exit = 0;
 825 #endif  /* HAVE_ONDEMAND */
 826
 827     if ((fds = cupsdDoSelect(timeout)) < 0)
 828     {
 829      /*
 830       * Got an error from select!
 831       */
 832
 833 #if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
 834       cupsd_printer_t   *p;             /* Current printer */
 835 #endif /* HAVE_DNSSD || HAVE_AVAHI */
 836
 837       if (errno == EINTR)               /* Just interrupted by a signal */
 838         continue;
 839
 840      /*
 841       * Log all sorts of debug info to help track down the problem.
 842       */
 843
 844       cupsdLogMessage(CUPSD_LOG_EMERG, "cupsdDoSelect() failed - %s!",
 845                       strerror(errno));
 846
 847       for (i = 0, con = (cupsd_client_t *)cupsArrayFirst(Clients);
 848            con;
 849            i ++, con = (cupsd_client_t *)cupsArrayNext(Clients))
 850         cupsdLogMessage(CUPSD_LOG_EMERG,
 851                         "Clients[%d] = %d, file = %d, state = %d",
 852                         i, con->number, con->file, httpGetState(con->http));
 853
 854       for (i = 0, lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 855            lis;
 856            i ++, lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 857         cupsdLogMessage(CUPSD_LOG_EMERG, "Listeners[%d] = %d", i, lis->fd);
 858
 859       cupsdLogMessage(CUPSD_LOG_EMERG, "CGIPipes[0] = %d", CGIPipes[0]);
 860
 861 #ifdef __APPLE__
 862       cupsdLogMessage(CUPSD_LOG_EMERG, "SysEventPipes[0] = %d",
 863                       SysEventPipes[0]);
 864 #endif /* __APPLE__ */
 865
 866       for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs);
 867            job;
 868            job = (cupsd_job_t *)cupsArrayNext(ActiveJobs))
 869         cupsdLogMessage(CUPSD_LOG_EMERG, "Jobs[%d] = %d < [%d %d] > [%d %d]",
 870                         job->id,
 871                         job->status_buffer ? job->status_buffer->fd : -1,
 872                         job->print_pipes[0], job->print_pipes[1],
 873                         job->back_pipes[0], job->back_pipes[1]);
 874
 875 #if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
 876       for (p = (cupsd_printer_t *)cupsArrayFirst(Printers);
 877            p;
 878            p = (cupsd_printer_t *)cupsArrayNext(Printers))
 879         cupsdLogMessage(CUPSD_LOG_EMERG, "printer[%s] reg_name=\"%s\"", p->name,
 880                         p->reg_name ? p->reg_name : "(null)");
 881 #endif /* HAVE_DNSSD || HAVE_AVAHI */
 882
 883       break;
 884     }
 885
 886     current_time = time(NULL);
 887
 888    /*
 889     * Write dirty config/state files...
 890     */
 891
 892     if (DirtyCleanTime && current_time >= DirtyCleanTime)
 893       cupsdCleanDirty();
 894
 895 #ifdef __APPLE__
 896    /*
 897     * If we are going to sleep and still have pending jobs, stop them after
 898     * a period of time...
 899     */
 900
 901     if (SleepJobs > 0 && current_time >= SleepJobs &&
 902         cupsArrayCount(PrintingJobs) > 0)
 903     {
 904       SleepJobs = 0;
 905       cupsdStopAllJobs(CUPSD_JOB_DEFAULT, 5);
 906     }
 907 #endif /* __APPLE__ */
 908
 909 #ifndef __APPLE__
 910    /*
 911     * Update the network interfaces once a minute...
 912     */
 913
 914     if ((current_time - netif_time) >= 60)
 915     {
 916       netif_time  = current_time;
 917       NetIFUpdate = 1;
 918     }
 919 #endif /* !__APPLE__ */
 920
 921 #ifdef HAVE_ONDEMAND
 922    /*
 923     * If no other work was scheduled and we're being controlled by launchd,
 924     * systemd, or upstart then timeout after 'LaunchdTimeout' seconds of
 925     * inactivity...
 926     */
 927
 928     if (!fds && service_idle_exit)
 929     {
 930       cupsdLogMessage(CUPSD_LOG_INFO,
 931                       "Printer sharing is off and there are no jobs pending, "
 932                       "will restart on demand.");
 933       stop_scheduler = 1;
 934       break;
 935     }
 936 #endif /* HAVE_ONDEMAND */
 937
 938    /*
 939     * Resume listening for new connections as needed...
 940     */
 941
 942     if (ListeningPaused && ListeningPaused <= current_time &&
 943         cupsArrayCount(Clients) < MaxClients)
 944       cupsdResumeListening();
 945
 946    /*
 947     * Expire subscriptions and unload completed jobs as needed...
 948     */
 949
 950     if (current_time > expire_time)
 951     {
 952       if (cupsArrayCount(Subscriptions) > 0)
 953         cupsdExpireSubscriptions(NULL, NULL);
 954
 955       cupsdUnloadCompletedJobs();
 956
 957       expire_time = current_time;
 958     }
 959
 960 #ifndef HAVE_AUTHORIZATION_H
 961    /*
 962     * Update the root certificate once every 5 minutes if we have client
 963     * connections...
 964     */
 965
 966     if ((current_time - RootCertTime) >= RootCertDuration && RootCertDuration &&
 967         !RunUser && cupsArrayCount(Clients))
 968     {
 969      /*
 970       * Update the root certificate...
 971       */
 972
 973       cupsdDeleteCert(0);
 974       cupsdAddCert(0, "root", cupsdDefaultAuthType());
 975     }
 976 #endif /* !HAVE_AUTHORIZATION_H */
 977
 978    /*
 979     * Check for new data on the client sockets...
 980     */
 981
 982     for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
 983          con;
 984          con = (cupsd_client_t *)cupsArrayNext(Clients))
 985     {
 986      /*
 987       * Process pending data in the input buffer...
 988       */
 989
 990       if (httpGetReady(con->http))
 991       {
 992         cupsdReadClient(con);
 993         continue;
 994       }
 995
 996      /*
 997       * Check the activity and close old clients...
 998       */
 999
1000       activity = current_time - Timeout;
1001       if (httpGetActivity(con->http) < activity && !con->pipe_pid)
1002       {
1003         cupsdLogMessage(CUPSD_LOG_DEBUG, "Closing client %d after %d seconds of inactivity.", con->number, Timeout);
1004
1005         cupsdCloseClient(con);
1006         continue;
1007       }
1008     }
1009
1010    /*
1011     * Update any pending multi-file documents...
1012     */
1013
1014     if ((current_time - senddoc_time) >= 10)
1015     {
1016       cupsdCheckJobs();
1017       senddoc_time = current_time;
1018     }
1019
1020    /*
1021     * Clean job history...
1022     */
1023
1024     if (JobHistoryUpdate && current_time >= JobHistoryUpdate)
1025       cupsdCleanJobs();
1026
1027    /*
1028     * Log statistics at most once a minute when in debug mode...
1029     */
1030
1031     if ((current_time - report_time) >= 60 && LogLevel >= CUPSD_LOG_DEBUG)
1032     {
1033       size_t            string_count,   /* String count */
1034                         alloc_bytes,    /* Allocated string bytes */
1035                         total_bytes;    /* Total string bytes */
1036 #ifdef HAVE_MALLINFO
1037       struct mallinfo   mem;            /* Malloc information */
1038
1039
1040       mem = mallinfo();
1041       cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: malloc-arena=%lu", mem.arena);
1042       cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: malloc-used=%lu",
1043                       mem.usmblks + mem.uordblks);
1044       cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: malloc-free=%lu",
1045                       mem.fsmblks + mem.fordblks);
1046 #endif /* HAVE_MALLINFO */
1047
1048       cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: clients=%d",
1049                       cupsArrayCount(Clients));
1050       cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: jobs=%d",
1051                       cupsArrayCount(Jobs));
1052       cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: jobs-active=%d",
1053                       cupsArrayCount(ActiveJobs));
1054       cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: printers=%d",
1055                       cupsArrayCount(Printers));
1056
1057       string_count = _cupsStrStatistics(&alloc_bytes, &total_bytes);
1058       cupsdLogMessage(CUPSD_LOG_DEBUG,
1059                       "Report: stringpool-string-count=" CUPS_LLFMT,
1060                       CUPS_LLCAST string_count);
1061       cupsdLogMessage(CUPSD_LOG_DEBUG,
1062                       "Report: stringpool-alloc-bytes=" CUPS_LLFMT,
1063                       CUPS_LLCAST alloc_bytes);
1064       cupsdLogMessage(CUPSD_LOG_DEBUG,
1065                       "Report: stringpool-total-bytes=" CUPS_LLFMT,
1066                       CUPS_LLCAST total_bytes);
1067
1068       report_time = current_time;
1069     }
1070
1071    /*
1072     * Handle OS-specific event notification for any events that have
1073     * accumulated.  Don't send these more than once a second...
1074     */
1075
1076     if (LastEvent && (current_time - event_time) >= 1)
1077     {
1078 #ifdef HAVE_NOTIFY_POST
1079       if (LastEvent & (CUPSD_EVENT_PRINTER_ADDED |
1080                        CUPSD_EVENT_PRINTER_DELETED |
1081                        CUPSD_EVENT_PRINTER_MODIFIED))
1082       {
1083         cupsdLogMessage(CUPSD_LOG_DEBUG2,
1084                         "notify_post(\"com.apple.printerListChange\")");
1085         notify_post("com.apple.printerListChange");
1086       }
1087
1088       if (LastEvent & CUPSD_EVENT_PRINTER_STATE_CHANGED)
1089       {
1090         cupsdLogMessage(CUPSD_LOG_DEBUG2,
1091                         "notify_post(\"com.apple.printerHistoryChange\")");
1092         notify_post("com.apple.printerHistoryChange");
1093       }
1094
1095       if (LastEvent & (CUPSD_EVENT_JOB_STATE_CHANGED |
1096                        CUPSD_EVENT_JOB_CONFIG_CHANGED |
1097                        CUPSD_EVENT_JOB_PROGRESS))
1098       {
1099         cupsdLogMessage(CUPSD_LOG_DEBUG2,
1100                         "notify_post(\"com.apple.jobChange\")");
1101         notify_post("com.apple.jobChange");
1102       }
1103 #endif /* HAVE_NOTIFY_POST */
1104
1105      /*
1106       * Reset the accumulated events...
1107       */
1108
1109       LastEvent  = CUPSD_EVENT_NONE;
1110       event_time = current_time;
1111     }
1112   }
1113
1114  /*
1115   * Log a message based on what happened...
1116   */
1117
1118   if (stop_scheduler)
1119   {
1120     cupsdLogMessage(CUPSD_LOG_INFO, "Scheduler shutting down normally.");
1121     cupsdAddEvent(CUPSD_EVENT_SERVER_STOPPED, NULL, NULL,
1122                   "Scheduler shutting down normally.");
1123   }
1124   else
1125   {
1126     cupsdLogMessage(CUPSD_LOG_ERROR,
1127                     "Scheduler shutting down due to program error.");
1128     cupsdAddEvent(CUPSD_EVENT_SERVER_STOPPED, NULL, NULL,
1129                   "Scheduler shutting down due to program error.");
1130   }
1131
1132  /*
1133   * Close all network clients...
1134   */
1135
1136   DoingShutdown = 1;
1137
1138   cupsdStopServer();
1139
1140 #ifdef HAVE_ONDEMAND
1141  /*
1142   * Update the keep-alive file as needed...
1143   */
1144
1145   if (OnDemand)
1146     service_checkout();
1147 #endif /* HAVE_ONDEMAND */
1148
1149  /*
1150   * Stop all jobs...
1151   */
1152
1153   cupsdFreeAllJobs();
1154
1155 #ifdef __APPLE__
1156  /*
1157   * Stop monitoring system event monitoring...
1158   */
1159
1160   if (use_sysman)
1161     cupsdStopSystemMonitor();
1162 #endif /* __APPLE__ */
1163
1164   cupsdStopSelect();
1165
1166   return (!stop_scheduler);
1167 }
1168
1169
1170 /*
1171  * 'cupsdAddString()' - Copy and add a string to an array.
1172  */
1173
1174 int                                     /* O  - 1 on success, 0 on failure */
1175 cupsdAddString(cups_array_t **a,        /* IO - String array */
1176                const char   *s)         /* I  - String to copy and add */
1177 {
1178   if (!*a)
1179     *a = cupsArrayNew3((cups_array_func_t)strcmp, NULL,
1180                        (cups_ahash_func_t)NULL, 0,
1181                        (cups_acopy_func_t)strdup,
1182                        (cups_afree_func_t)free);
1183
1184   return (cupsArrayAdd(*a, (char *)s));
1185 }
1186
1187
1188 /*
1189  * 'cupsdCheckProcess()' - Tell the main loop to check for dead children.
1190  */
1191
1192 void
1193 cupsdCheckProcess(void)
1194 {
1195  /*
1196   * Flag that we have dead children...
1197   */
1198
1199   dead_children = 1;
1200 }
1201
1202
1203 /*
1204  * 'cupsdClearString()' - Clear a string.
1205  */
1206
1207 void
1208 cupsdClearString(char **s)              /* O - String value */
1209 {
1210   if (s && *s)
1211   {
1212     free(*s);
1213     *s = NULL;
1214   }
1215 }
1216
1217
1218 /*
1219  * 'cupsdFreeStrings()' - Free an array of strings.
1220  */
1221
1222 void
1223 cupsdFreeStrings(cups_array_t **a)      /* IO - String array */
1224 {
1225   if (*a)
1226   {
1227     cupsArrayDelete(*a);
1228     *a = NULL;
1229   }
1230 }
1231
1232
1233 /*
1234  * 'cupsdHoldSignals()' - Hold child and termination signals.
1235  */
1236
1237 void
1238 cupsdHoldSignals(void)
1239 {
1240 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
1241   sigset_t              newmask;        /* New POSIX signal mask */
1242 #endif /* HAVE_SIGACTION && !HAVE_SIGSET */
1243
1244
1245   holdcount ++;
1246   if (holdcount > 1)
1247     return;
1248
1249 #ifdef HAVE_SIGSET
1250   sighold(SIGTERM);
1251   sighold(SIGCHLD);
1252 #elif defined(HAVE_SIGACTION)
1253   sigemptyset(&newmask);
1254   sigaddset(&newmask, SIGTERM);
1255   sigaddset(&newmask, SIGCHLD);
1256   sigprocmask(SIG_BLOCK, &newmask, &holdmask);
1257 #endif /* HAVE_SIGSET */
1258 }
1259
1260
1261 /*
1262  * 'cupsdReleaseSignals()' - Release signals for delivery.
1263  */
1264
1265 void
1266 cupsdReleaseSignals(void)
1267 {
1268   holdcount --;
1269   if (holdcount > 0)
1270     return;
1271
1272 #ifdef HAVE_SIGSET
1273   sigrelse(SIGTERM);
1274   sigrelse(SIGCHLD);
1275 #elif defined(HAVE_SIGACTION)
1276   sigprocmask(SIG_SETMASK, &holdmask, NULL);
1277 #endif /* HAVE_SIGSET */
1278 }
1279
1280
1281 /*
1282  * 'cupsdSetString()' - Set a string value.
1283  */
1284
1285 void
1286 cupsdSetString(char       **s,          /* O - New string */
1287                const char *v)           /* I - String value */
1288 {
1289   if (!s || *s == v)
1290     return;
1291
1292   if (*s)
1293     free(*s);
1294
1295   if (v)
1296     *s = strdup(v);
1297   else
1298     *s = NULL;
1299 }
1300
1301
1302 /*
1303  * 'cupsdSetStringf()' - Set a formatted string value.
1304  */
1305
1306 void
1307 cupsdSetStringf(char       **s,         /* O - New string */
1308                 const char *f,          /* I - Printf-style format string */
1309                 ...)                    /* I - Additional args as needed */
1310 {
1311   char          v[65536 + 64];          /* Formatting string value */
1312   va_list       ap;                     /* Argument pointer */
1313   char          *olds;                  /* Old string */
1314
1315
1316   if (!s)
1317     return;
1318
1319   olds = *s;
1320
1321   if (f)
1322   {
1323     va_start(ap, f);
1324     vsnprintf(v, sizeof(v), f, ap);
1325     va_end(ap);
1326
1327     *s = strdup(v);
1328   }
1329   else
1330     *s = NULL;
1331
1332   if (olds)
1333     free(olds);
1334 }
1335
1336
1337 /*
1338  * 'parent_handler()' - Catch USR1/CHLD signals...
1339  */
1340
1341 static void
1342 parent_handler(int sig)                 /* I - Signal */
1343 {
1344  /*
1345   * Store the signal we got from the OS and return...
1346   */
1347
1348   parent_signal = sig;
1349 }
1350
1351
1352 /*
1353  * 'process_children()' - Process all dead children...
1354  */
1355
1356 static void
1357 process_children(void)
1358 {
1359   int           status;                 /* Exit status of child */
1360   int           pid,                    /* Process ID of child */
1361                 job_id;                 /* Job ID of child */
1362   cupsd_job_t   *job;                   /* Current job */
1363   int           i;                      /* Looping var */
1364   char          name[1024];             /* Process name */
1365   const char    *type;                  /* Type of program */
1366
1367
1368   cupsdLogMessage(CUPSD_LOG_DEBUG2, "process_children()");
1369
1370  /*
1371   * Reset the dead_children flag...
1372   */
1373
1374   dead_children = 0;
1375
1376  /*
1377   * Collect the exit status of some children...
1378   */
1379
1380 #ifdef HAVE_WAITPID
1381   while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
1382 #elif defined(HAVE_WAIT3)
1383   while ((pid = wait3(&status, WNOHANG, NULL)) > 0)
1384 #else
1385   if ((pid = wait(&status)) > 0)
1386 #endif /* HAVE_WAITPID */
1387   {
1388    /*
1389     * Collect the name of the process that finished...
1390     */
1391
1392     cupsdFinishProcess(pid, name, sizeof(name), &job_id);
1393
1394    /*
1395     * Delete certificates for CGI processes...
1396     */
1397
1398     if (pid)
1399       cupsdDeleteCert(pid);
1400
1401    /*
1402     * Handle completed job filters...
1403     */
1404
1405     if (job_id > 0)
1406       job = cupsdFindJob(job_id);
1407     else
1408       job  = NULL;
1409
1410     if (job)
1411     {
1412       for (i = 0; job->filters[i]; i ++)
1413         if (job->filters[i] == pid)
1414           break;
1415
1416       if (job->filters[i] || job->backend == pid)
1417       {
1418        /*
1419         * OK, this process has gone away; what's left?
1420         */
1421
1422         if (job->filters[i])
1423         {
1424           job->filters[i] = -pid;
1425           type            = "Filter";
1426         }
1427         else
1428         {
1429           job->backend = -pid;
1430           type         = "Backend";
1431         }
1432
1433         if (status && status != SIGTERM && status != SIGKILL &&
1434             status != SIGPIPE)
1435         {
1436          /*
1437           * An error occurred; save the exit status so we know to stop
1438           * the printer or cancel the job when all of the filters finish...
1439           *
1440           * A negative status indicates that the backend failed and the
1441           * printer needs to be stopped.
1442           *
1443           * In order to preserve the most serious status, we always log
1444           * when a process dies due to a signal (e.g. SIGABRT, SIGSEGV,
1445           * and SIGBUS) and prefer to log the backend exit status over a
1446           * filter's.
1447           */
1448
1449           int old_status = abs(job->status);
1450
1451           if (WIFSIGNALED(status) ||    /* This process crashed, or */
1452               !job->status ||           /* No process had a status, or */
1453               (!job->filters[i] && WIFEXITED(old_status)))
1454           {                             /* Backend and filter didn't crash */
1455             if (job->filters[i])
1456               job->status = status;     /* Filter failed */
1457             else
1458               job->status = -status;    /* Backend failed */
1459           }
1460
1461           if (job->state_value == IPP_JOB_PROCESSING &&
1462               job->status_level > CUPSD_LOG_ERROR &&
1463               (job->filters[i] || !WIFEXITED(status)))
1464           {
1465             char        message[1024];  /* New printer-state-message */
1466
1467
1468             job->status_level = CUPSD_LOG_ERROR;
1469
1470             snprintf(message, sizeof(message), "%s failed", type);
1471
1472             if (job->printer)
1473             {
1474               strlcpy(job->printer->state_message, message,
1475                        sizeof(job->printer->state_message));
1476             }
1477
1478             if (!job->attrs)
1479               cupsdLoadJob(job);
1480
1481             if (!job->printer_message && job->attrs)
1482             {
1483               if ((job->printer_message =
1484                        ippFindAttribute(job->attrs, "job-printer-state-message",
1485                                         IPP_TAG_TEXT)) == NULL)
1486                 job->printer_message = ippAddString(job->attrs, IPP_TAG_JOB,
1487                                                     IPP_TAG_TEXT,
1488                                                     "job-printer-state-message",
1489                                                     NULL, NULL);
1490             }
1491
1492             if (job->printer_message)
1493               ippSetString(job->attrs, &job->printer_message, 0, message);
1494           }
1495         }
1496
1497        /*
1498         * If this is not the last file in a job, see if all of the
1499         * filters are done, and if so move to the next file.
1500         */
1501
1502         if (job->state_value >= IPP_JOB_CANCELED)
1503         {
1504          /*
1505           * Remove the job from the active list if there are no processes still
1506           * running for it...
1507           */
1508
1509           for (i = 0; job->filters[i] < 0; i++);
1510
1511           if (!job->filters[i] && job->backend <= 0)
1512             cupsArrayRemove(ActiveJobs, job);
1513         }
1514         else if (job->current_file < job->num_files && job->printer)
1515         {
1516           for (i = 0; job->filters[i] < 0; i ++);
1517
1518           if (!job->filters[i] &&
1519               (!job->printer->pc || !job->printer->pc->single_file ||
1520                job->backend <= 0))
1521           {
1522            /*
1523             * Process the next file...
1524             */
1525
1526             cupsdContinueJob(job);
1527           }
1528         }
1529       }
1530     }
1531
1532    /*
1533     * Show the exit status as needed, ignoring SIGTERM and SIGKILL errors
1534     * since they come when we kill/end a process...
1535     */
1536
1537     if (status == SIGTERM || status == SIGKILL)
1538     {
1539       cupsdLogJob(job, CUPSD_LOG_DEBUG,
1540                   "PID %d (%s) was terminated normally with signal %d.", pid,
1541                   name, status);
1542     }
1543     else if (status == SIGPIPE)
1544     {
1545       cupsdLogJob(job, CUPSD_LOG_DEBUG,
1546                   "PID %d (%s) did not catch or ignore signal %d.", pid, name,
1547                   status);
1548     }
1549     else if (status)
1550     {
1551       if (WIFEXITED(status))
1552       {
1553         int code = WEXITSTATUS(status); /* Exit code */
1554
1555         if (code > 100)
1556           cupsdLogJob(job, CUPSD_LOG_DEBUG,
1557                       "PID %d (%s) stopped with status %d (%s)", pid, name,
1558                       code, strerror(code - 100));
1559         else
1560           cupsdLogJob(job, CUPSD_LOG_DEBUG,
1561                       "PID %d (%s) stopped with status %d.", pid, name, code);
1562       }
1563       else
1564         cupsdLogJob(job, CUPSD_LOG_DEBUG, "PID %d (%s) crashed on signal %d.",
1565                     pid, name, WTERMSIG(status));
1566
1567       if (LogLevel < CUPSD_LOG_DEBUG)
1568         cupsdLogJob(job, CUPSD_LOG_INFO,
1569                     "Hint: Try setting the LogLevel to \"debug\" to find out "
1570                     "more.");
1571     }
1572     else
1573       cupsdLogJob(job, CUPSD_LOG_DEBUG, "PID %d (%s) exited with no errors.",
1574                   pid, name);
1575   }
1576
1577  /*
1578   * If wait*() is interrupted by a signal, tell main() to call us again...
1579   */
1580
1581   if (pid < 0 && errno == EINTR)
1582     dead_children = 1;
1583 }
1584
1585
1586 /*
1587  * 'select_timeout()' - Calculate the select timeout value.
1588  *
1589  */
1590
1591 static long                             /* O - Number of seconds */
1592 select_timeout(int fds)                 /* I - Number of descriptors returned */
1593 {
1594   long                  timeout;        /* Timeout for select */
1595   time_t                now;            /* Current time */
1596   cupsd_client_t        *con;           /* Client information */
1597   cupsd_job_t           *job;           /* Job information */
1598   const char            *why;           /* Debugging aid */
1599
1600
1601   cupsdLogMessage(CUPSD_LOG_DEBUG2, "select_timeout: JobHistoryUpdate=%ld",
1602                   (long)JobHistoryUpdate);
1603
1604  /*
1605   * Check to see if any of the clients have pending data to be
1606   * processed; if so, the timeout should be 0...
1607   */
1608
1609   for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
1610        con;
1611        con = (cupsd_client_t *)cupsArrayNext(Clients))
1612     if (httpGetReady(con->http))
1613       return (0);
1614
1615  /*
1616   * If select has been active in the last second (fds > 0) or we have
1617   * many resources in use then don't bother trying to optimize the
1618   * timeout, just make it 1 second.
1619   */
1620
1621   if (fds > 0 || cupsArrayCount(Clients) > 50)
1622     return (1);
1623
1624  /*
1625   * Otherwise, check all of the possible events that we need to wake for...
1626   */
1627
1628   now     = time(NULL);
1629   timeout = now + 86400;                /* 86400 == 1 day */
1630   why     = "do nothing";
1631
1632 #ifdef __APPLE__
1633  /*
1634   * When going to sleep, wake up to cancel jobs that don't complete in time.
1635   */
1636
1637   if (SleepJobs > 0 && SleepJobs < timeout)
1638   {
1639     timeout = SleepJobs;
1640     why     = "cancel jobs before sleeping";
1641   }
1642 #endif /* __APPLE__ */
1643
1644  /*
1645   * Check whether we are accepting new connections...
1646   */
1647
1648   if (ListeningPaused > 0 && cupsArrayCount(Clients) < MaxClients &&
1649       ListeningPaused < timeout)
1650   {
1651     if (ListeningPaused <= now)
1652       timeout = now;
1653     else
1654       timeout = ListeningPaused;
1655
1656     why = "resume listening";
1657   }
1658
1659  /*
1660   * Check the activity and close old clients...
1661   */
1662
1663   for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
1664        con;
1665        con = (cupsd_client_t *)cupsArrayNext(Clients))
1666     if ((httpGetActivity(con->http) + Timeout) < timeout)
1667     {
1668       timeout = httpGetActivity(con->http) + Timeout;
1669       why     = "timeout a client connection";
1670     }
1671
1672  /*
1673   * Write out changes to configuration and state files...
1674   */
1675
1676   if (DirtyCleanTime && timeout > DirtyCleanTime)
1677   {
1678     timeout = DirtyCleanTime;
1679     why     = "write dirty config/state files";
1680   }
1681
1682  /*
1683   * Check for any job activity...
1684   */
1685
1686   if (JobHistoryUpdate && timeout > JobHistoryUpdate)
1687   {
1688     timeout = JobHistoryUpdate;
1689     why     = "update job history";
1690   }
1691
1692   for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs);
1693        job;
1694        job = (cupsd_job_t *)cupsArrayNext(ActiveJobs))
1695   {
1696     if (job->cancel_time && job->cancel_time < timeout)
1697     {
1698       timeout = job->cancel_time;
1699       why     = "cancel stuck jobs";
1700     }
1701
1702     if (job->kill_time && job->kill_time < timeout)
1703     {
1704       timeout = job->kill_time;
1705       why     = "kill unresponsive jobs";
1706     }
1707
1708     if (job->state_value == IPP_JOB_HELD && job->hold_until < timeout)
1709     {
1710       timeout = job->hold_until;
1711       why     = "release held jobs";
1712     }
1713
1714     if (job->state_value == IPP_JOB_PENDING && timeout > (now + 10))
1715     {
1716       timeout = now + 10;
1717       why     = "start pending jobs";
1718       break;
1719     }
1720   }
1721
1722 #ifdef HAVE_MALLINFO
1723  /*
1724   * Log memory usage every minute...
1725   */
1726
1727   if (LogLevel >= CUPSD_LOG_DEBUG && (mallinfo_time + 60) < timeout)
1728   {
1729     timeout = mallinfo_time + 60;
1730     why     = "display memory usage";
1731   }
1732 #endif /* HAVE_MALLINFO */
1733
1734  /*
1735   * Adjust from absolute to relative time.  We add 1 second to the timeout since
1736   * events occur after the timeout expires, and limit the timeout to 86400
1737   * seconds (1 day) to avoid select() timeout limits present on some operating
1738   * systems...
1739   */
1740
1741   timeout = timeout - now + 1;
1742
1743   if (timeout < 1)
1744     timeout = 1;
1745   else if (timeout > 86400)
1746     timeout = 86400;
1747
1748  /*
1749   * Log and return the timeout value...
1750   */
1751
1752   cupsdLogMessage(CUPSD_LOG_DEBUG2, "select_timeout(%d): %ld seconds to %s",
1753                   fds, timeout, why);
1754
1755   return (timeout);
1756 }
1757
1758
1759 /*
1760  * 'sigchld_handler()' - Handle 'child' signals from old processes.
1761  */
1762
1763 static void
1764 sigchld_handler(int sig)                /* I - Signal number */
1765 {
1766   (void)sig;
1767
1768  /*
1769   * Flag that we have dead children...
1770   */
1771
1772   dead_children = 1;
1773
1774  /*
1775   * Reset the signal handler as needed...
1776   */
1777
1778 #if !defined(HAVE_SIGSET) && !defined(HAVE_SIGACTION)
1779   signal(SIGCLD, sigchld_handler);
1780 #endif /* !HAVE_SIGSET && !HAVE_SIGACTION */
1781 }
1782
1783
1784 /*
1785  * 'sighup_handler()' - Handle 'hangup' signals to reconfigure the scheduler.
1786  */
1787
1788 static void
1789 sighup_handler(int sig)                 /* I - Signal number */
1790 {
1791   (void)sig;
1792
1793   NeedReload = RELOAD_ALL;
1794   ReloadTime = time(NULL);
1795
1796 #if !defined(HAVE_SIGSET) && !defined(HAVE_SIGACTION)
1797   signal(SIGHUP, sighup_handler);
1798 #endif /* !HAVE_SIGSET && !HAVE_SIGACTION */
1799 }
1800
1801
1802 /*
1803  * 'sigterm_handler()' - Handle 'terminate' signals that stop the scheduler.
1804  */
1805
1806 static void
1807 sigterm_handler(int sig)                /* I - Signal number */
1808 {
1809   (void)sig;    /* remove compiler warnings... */
1810
1811  /*
1812   * Flag that we should stop and return...
1813   */
1814
1815   stop_scheduler = 1;
1816 }
1817
1818
1819 #ifdef HAVE_ONDEMAND
1820 /*
1821  * 'service_add_listener()' - Bind an open fd as a Listener.
1822  */
1823
1824 static void
1825 service_add_listener(int fd,            /* I - Socket file descriptor */
1826                      int idx)           /* I - Listener number, for logging */
1827 {
1828   cupsd_listener_t      *lis;           /* Listeners array */
1829   http_addr_t           addr;           /* Address variable */
1830   socklen_t             addrlen;        /* Length of address */
1831   char                  s[256];         /* String addresss */
1832
1833
1834   addrlen = sizeof(addr);
1835
1836   if (getsockname(fd, (struct sockaddr *)&addr, &addrlen))
1837   {
1838     cupsdLogMessage(CUPSD_LOG_ERROR, "service_add_listener: Unable to get local address for listener #%d: %s", idx + 1, strerror(errno));
1839     return;
1840   }
1841
1842   cupsdLogMessage(CUPSD_LOG_DEBUG, "service_add_listener: Listener #%d at fd %d, \"%s\".", idx + 1, fd, httpAddrString(&addr, s, sizeof(s)));
1843
1844  /*
1845   * Try to match the on-demand socket address to one of the listeners...
1846   */
1847
1848   for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
1849        lis;
1850        lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
1851     if (httpAddrEqual(&lis->address, &addr))
1852       break;
1853
1854   /*
1855    * Add a new listener If there's no match...
1856    */
1857
1858   if (lis)
1859   {
1860     cupsdLogMessage(CUPSD_LOG_DEBUG, "service_add_listener: Matched existing listener #%d to %s.", idx + 1, httpAddrString(&(lis->address), s, sizeof(s)));
1861   }
1862   else
1863   {
1864     cupsdLogMessage(CUPSD_LOG_DEBUG, "service_add_listener: Adding new listener #%d for %s.", idx + 1, httpAddrString(&addr, s, sizeof(s)));
1865
1866     if ((lis = calloc(1, sizeof(cupsd_listener_t))) == NULL)
1867     {
1868       cupsdLogMessage(CUPSD_LOG_ERROR, "service_add_listener: Unable to allocate listener: %s.", strerror(errno));
1869       exit(EXIT_FAILURE);
1870       return;
1871     }
1872
1873     cupsArrayAdd(Listeners, lis);
1874
1875     memcpy(&lis->address, &addr, sizeof(lis->address));
1876   }
1877
1878   lis->fd        = fd;
1879   lis->on_demand = 1;
1880
1881 #  ifdef HAVE_SSL
1882   if (httpAddrPort(&(lis->address)) == 443)
1883     lis->encryption = HTTP_ENCRYPT_ALWAYS;
1884 #  endif /* HAVE_SSL */
1885 }
1886
1887
1888 /*
1889  * 'service_checkin()' - Check-in with launchd and collect the listening fds.
1890  */
1891
1892 static void
1893 service_checkin(void)
1894 {
1895 #  ifdef HAVE_LAUNCHD
1896   int                   error;          /* Check-in error, if any */
1897   size_t                i,              /* Looping var */
1898                         count;          /* Number of listeners */
1899   int                   *ld_sockets;    /* Listener sockets */
1900
1901
1902   cupsdLogMessage(CUPSD_LOG_DEBUG, "service_checkin: pid=%d", (int)getpid());
1903
1904  /*
1905   * Check-in with launchd...
1906   */
1907
1908   if ((error = launch_activate_socket("Listeners", &ld_sockets, &count)) != 0)
1909   {
1910     cupsdLogMessage(CUPSD_LOG_ERROR, "service_checkin: Unable to get listener sockets: %s", strerror(error));
1911     exit(EXIT_FAILURE);
1912     return; /* anti-compiler-warning */
1913   }
1914
1915  /*
1916   * Try to match the launchd sockets to the cupsd listeners...
1917   */
1918
1919   cupsdLogMessage(CUPSD_LOG_DEBUG, "service_checkin: %d listeners.", (int)count);
1920
1921   for (i = 0; i < count; i ++)
1922     service_add_listener(ld_sockets[i], (int)i);
1923
1924   free(ld_sockets);
1925
1926 #  elif defined(HAVE_SYSTEMD)
1927   int                   i,              /* Looping var */
1928                         count;          /* Number of listeners */
1929
1930
1931   cupsdLogMessage(CUPSD_LOG_DEBUG, "service_checkin: pid=%d", (int)getpid());
1932
1933  /*
1934   * Check-in with systemd...
1935   */
1936
1937   if ((count = sd_listen_fds(0)) < 0)
1938   {
1939     cupsdLogMessage(CUPSD_LOG_ERROR, "service_checkin: Unable to get listener sockets: %s", strerror(-count));
1940     exit(EXIT_FAILURE);
1941     return; /* anti-compiler-warning */
1942   }
1943
1944  /*
1945   * Try to match the systemd sockets to the cupsd listeners...
1946   */
1947
1948   cupsdLogMessage(CUPSD_LOG_DEBUG, "service_checkin: %d listeners.", count);
1949
1950   for (i = 0; i < count; i ++)
1951     service_add_listener(SD_LISTEN_FDS_START + i, i);
1952
1953 #  elif defined(HAVE_UPSTART)
1954   const char            *e;             /* Environment var */
1955   int                   fd;             /* File descriptor */
1956
1957
1958   if (!(e = getenv("UPSTART_EVENTS")))
1959   {
1960     cupsdLogMessage(CUPSD_LOG_ERROR, "service_checkin: We did not get started via Upstart.");
1961     exit(EXIT_FAILURE);
1962     return;
1963   }
1964
1965   if (strcasecmp(e, "socket"))
1966   {
1967     cupsdLogMessage(CUPSD_LOG_ERROR, "service_checkin: We did not get triggered via an Upstart socket event.");
1968     exit(EXIT_FAILURE);
1969     return;
1970   }
1971
1972   if ((e = getenv("UPSTART_FDS")) == NULL)
1973   {
1974     cupsdLogMessage(CUPSD_LOG_ERROR, "service_checkin: Unable to get listener sockets from UPSTART_FDS.");
1975     exit(EXIT_FAILURE);
1976     return;
1977   }
1978
1979   cupsdLogMessage(CUPSD_LOG_DEBUG, "service_checkin: UPSTART_FDS=%s", e);
1980
1981   fd = (int)strtol(e, NULL, 10);
1982   if (fd < 0)
1983   {
1984     cupsdLogMessage(CUPSD_LOG_ERROR, "service_checkin: Could not parse UPSTART_FDS: %s", strerror(errno));
1985     exit(EXIT_FAILURE);
1986     return;
1987   }
1988
1989  /*
1990   * Upstart only supportst a single on-demand socket file descriptor...
1991   */
1992
1993   service_add_listener(fd, 0);
1994
1995 #  else
1996 #    error "Error: defined HAVE_ONDEMAND but no launchd/systemd/upstart selection"
1997 #  endif /* HAVE_LAUNCH_ACTIVATE_SOCKET */
1998 }
1999
2000
2001 /*
2002  * 'service_checkout()' - Update the CUPS_KEEPALIVE file as needed.
2003  */
2004
2005 static void
2006 service_checkout(void)
2007 {
2008   int   fd;                             /* File descriptor */
2009
2010
2011  /*
2012   * Create or remove the "keep-alive" file based on whether there are active
2013   * jobs or shared printers to advertise...
2014   */
2015
2016   if (cupsArrayCount(ActiveJobs) ||     /* Active jobs */
2017       WebInterface ||                   /* Web interface enabled */
2018       NeedReload ||                     /* Doing a reload */
2019       (Browsing && BrowseLocalProtocols && cupsArrayCount(Printers)))
2020                                         /* Printers being shared */
2021   {
2022     cupsdLogMessage(CUPSD_LOG_DEBUG, "Creating keep-alive file \"" CUPS_KEEPALIVE "\".");
2023
2024     if ((fd = open(CUPS_KEEPALIVE, O_RDONLY | O_CREAT | O_EXCL, S_IRUSR)) >= 0)
2025       close(fd);
2026   }
2027   else
2028   {
2029     cupsdLogMessage(CUPSD_LOG_DEBUG, "Removing keep-alive file \"" CUPS_KEEPALIVE "\".");
2030
2031     unlink(CUPS_KEEPALIVE);
2032   }
2033 }
2034 #endif /* HAVE_ONDEMAND */
2035
2036
2037 /*
2038  * 'usage()' - Show scheduler usage.
2039  */
2040
2041 static void
2042 usage(int status)                       /* O - Exit status */
2043 {
2044   FILE  *fp = status ? stderr : stdout; /* Output file */
2045
2046
2047   _cupsLangPuts(fp, _("Usage: cupsd [options]"));
2048   _cupsLangPuts(fp, _("Options:"));
2049   _cupsLangPuts(fp, _("  -c cupsd.conf           Set cupsd.conf file to use."));
2050   _cupsLangPuts(fp, _("  -f                      Run in the foreground."));
2051   _cupsLangPuts(fp, _("  -F                      Run in the foreground but detach from console."));
2052   _cupsLangPuts(fp, _("  -h                      Show this usage message."));
2053 #ifdef HAVE_ONDEMAND
2054   _cupsLangPuts(fp, _("  -l                      Run cupsd on demand."));
2055 #endif /* HAVE_ONDEMAND */
2056   _cupsLangPuts(fp, _("  -s cups-files.conf      Set cups-files.conf file to use."));
2057   _cupsLangPuts(fp, _("  -t                      Test the configuration file."));
2058
2059   exit(status);
2060 }