Ejemplo n.º 1
0
Archivo: server.c Proyecto: ezeep/cups
void
cupsdStartServer(void)
{
 /*
  * Start color management (as needed)...
  */

  cupsdStartColor();

 /*
  * Create the default security profile...
  */

  DefaultProfile = cupsdCreateProfile(0, 1);

 /*
  * Startup all the networking stuff...
  */

  cupsdStartListening();
  cupsdStartBrowsing();

 /*
  * Create a pipe for CGI processes...
  */

  if (cupsdOpenPipe(CGIPipes))
    cupsdLogMessage(CUPSD_LOG_ERROR,
                    "cupsdStartServer: Unable to create pipes for CGI status!");
  else
  {
    CGIStatusBuffer = cupsdStatBufNew(CGIPipes[0], "[CGI]");

    cupsdAddSelect(CGIPipes[0], (cupsd_selfunc_t)cupsdUpdateCGI, NULL, NULL);
  }

 /*
  * Mark that the server has started and printers and jobs may be changed...
  */

  LastEvent = CUPSD_EVENT_PRINTER_CHANGED | CUPSD_EVENT_JOB_STATE_CHANGED |
              CUPSD_EVENT_SERVER_STARTED;
  started   = 1;

  cupsdSetBusyState();
}
Ejemplo n.º 2
0
Archivo: main.c Proyecto: apple/cups
int					/* O - Exit status */
main(int  argc,				/* I - Number of command-line args */
     char *argv[])			/* I - Command-line arguments */
{
  int			i;		/* Looping var */
  char			*opt;		/* Option character */
  int			close_all = 1,	/* Close all file descriptors? */
			disconnect = 1,	/* Disconnect from controlling terminal? */
			fg = 0,		/* Run in foreground? */
			run_as_child = 0,
					/* Running as child process? */
			print_profile = 0;
					/* Print the sandbox profile to stdout? */
  int			fds;		/* Number of ready descriptors */
  cupsd_client_t	*con;		/* Current client */
  cupsd_job_t		*job;		/* Current job */
  cupsd_listener_t	*lis;		/* Current listener */
  time_t		current_time,	/* Current time */
			activity,	/* Client activity timer */
			senddoc_time,	/* Send-Document time */
			expire_time,	/* Subscription expire time */
			report_time,	/* Malloc/client/job report time */
			event_time;	/* Last event notification time */
  long			timeout;	/* Timeout for cupsdDoSelect() */
  struct rlimit		limit;		/* Runtime limit */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
  struct sigaction	action;		/* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
#ifdef __APPLE__
  int			use_sysman = 1;	/* Use system management functions? */
#else
  time_t		netif_time = 0;	/* Time since last network update */
#endif /* __APPLE__ */
#if defined(HAVE_ONDEMAND)
  int			service_idle_exit;
					/* Idle exit on select timeout? */
#endif /* HAVE_ONDEMAND */


#ifdef HAVE_GETEUID
 /*
  * Check for setuid invocation, which we do not support!
  */

  if (getuid() != geteuid())
  {
    fputs("cupsd: Cannot run as a setuid program.\n", stderr);
    return (1);
  }
#endif /* HAVE_GETEUID */

 /*
  * Check for command-line arguments...
  */

  fg = 0;

#ifdef HAVE_LAUNCHD
  if (getenv("CUPSD_LAUNCHD"))
  {
    OnDemand   = 1;
    fg         = 1;
    close_all  = 0;
    disconnect = 0;
  }
#endif /* HAVE_LAUNCHD */

  for (i = 1; i < argc; i ++)
    if (argv[i][0] == '-')
      for (opt = argv[i] + 1; *opt != '\0'; opt ++)
        switch (*opt)
	{
	  case 'C' : /* Run as child with config file */
              run_as_child = 1;
	      fg           = 1;
	      close_all    = 0;

	  case 'c' : /* Configuration file */
	      i ++;
	      if (i >= argc)
	      {
	        _cupsLangPuts(stderr, _("cupsd: Expected config filename "
		                        "after \"-c\" option."));
	        usage(1);
	      }

              if (argv[i][0] == '/')
	      {
	       /*
	        * Absolute directory...
		*/

		cupsdSetString(&ConfigurationFile, argv[i]);
              }
	      else
	      {
	       /*
	        * Relative directory...
		*/

                char *current;		/* Current directory */

	       /*
	        * Allocate a buffer for the current working directory to
		* reduce run-time stack usage; this approximates the
		* behavior of some implementations of getcwd() when they
		* are passed a NULL pointer.
	        */

                if ((current = malloc(1024)) == NULL)
		{
		  _cupsLangPuts(stderr,
		                _("cupsd: Unable to get current directory."));
                  return (1);
		}

		if (!getcwd(current, 1024))
		{
		  _cupsLangPuts(stderr,
		                _("cupsd: Unable to get current directory."));
                  free(current);
		  return (1);
		}

		cupsdSetStringf(&ConfigurationFile, "%s/%s", current, argv[i]);
		free(current);
              }
	      break;

          case 'f' : /* Run in foreground... */
	      fg         = 1;
	      disconnect = 0;
	      close_all  = 0;
	      break;

          case 'F' : /* Run in foreground, but disconnect from terminal... */
	      fg        = 1;
	      close_all = 0;
	      break;

          case 'h' : /* Show usage/help */
	      usage(0);
	      break;

          case 'l' : /* Started by launchd/systemd/upstart... */
#if defined(HAVE_ONDEMAND)
	      OnDemand   = 1;
	      fg         = 1;
	      close_all  = 0;
	      disconnect = 0;
#else
	      _cupsLangPuts(stderr, _("cupsd: On-demand support not compiled "
	                              "in, running in normal mode."));
              fg         = 0;
	      disconnect = 1;
	      close_all  = 1;
#endif /* HAVE_ONDEMAND */
	      break;

          case 'p' : /* Stop immediately for profiling */
              fputs("cupsd: -p (startup profiling) is for internal testing "
                    "use only!\n", stderr);
	      stop_scheduler = 1;
	      fg             = 1;
	      disconnect     = 0;
	      close_all      = 0;
	      break;

          case 'P' : /* Disable security profiles */
              fputs("cupsd: -P (disable sandboxing) is for internal testing use only.\n", stderr);
	      UseSandboxing = 0;
	      break;

          case 's' : /* Set cups-files.conf location */
              i ++;
	      if (i >= argc)
	      {
	        _cupsLangPuts(stderr, _("cupsd: Expected cups-files.conf "
	                                "filename after \"-s\" option."));
	        usage(1);
	      }

              if (argv[i][0] != '/')
	      {
	       /*
	        * Relative filename not allowed...
		*/

	        _cupsLangPuts(stderr, _("cupsd: Relative cups-files.conf "
	                                "filename not allowed."));
	        usage(1);
              }

	      cupsdSetString(&CupsFilesFile, argv[i]);
	      break;

#ifdef __APPLE__
          case 'S' : /* Disable system management functions */
              fputs("cupsd: -S (disable system management) for internal "
                    "testing use only!\n", stderr);
	      use_sysman = 0;
	      break;
#endif /* __APPLE__ */

          case 't' : /* Test the cupsd.conf file... */
	      TestConfigFile = 1;
	      fg             = 1;
	      disconnect     = 0;
	      close_all      = 0;
	      break;

          case 'T' : /* Print security profile */
              print_profile = 1;
              fg            = 1;
              disconnect    = 0;
              close_all     = 0;
              break;

	  default : /* Unknown option */
              _cupsLangPrintf(stderr, _("cupsd: Unknown option \"%c\" - "
	                                "aborting."), *opt);
	      usage(1);
	      break;
	}
    else
    {
      _cupsLangPrintf(stderr, _("cupsd: Unknown argument \"%s\" - aborting."),
                      argv[i]);
      usage(1);
    }

  if (!ConfigurationFile)
    cupsdSetString(&ConfigurationFile, CUPS_SERVERROOT "/cupsd.conf");

  if (!CupsFilesFile)
  {
    char	*filename,		/* Copy of cupsd.conf filename */
		*slash;			/* Final slash in cupsd.conf filename */
    size_t	len;			/* Size of buffer */

    len = strlen(ConfigurationFile) + 15;
    if ((filename = malloc(len)) == NULL)
    {
      _cupsLangPrintf(stderr,
		      _("cupsd: Unable to get path to "
			"cups-files.conf file."));
      return (1);
    }

    strlcpy(filename, ConfigurationFile, len);
    if ((slash = strrchr(filename, '/')) == NULL)
    {
      _cupsLangPrintf(stderr,
		      _("cupsd: Unable to get path to "
			"cups-files.conf file."));
      return (1);
    }

    strlcpy(slash, "/cups-files.conf", len - (size_t)(slash - filename));
    cupsdSetString(&CupsFilesFile, filename);
    free(filename);
  }

  if (disconnect)
  {
   /*
    * Make sure we aren't tying up any filesystems...
    */

    chdir("/");

   /*
    * Disconnect from the controlling terminal...
    */

    setsid();
  }

  if (close_all)
  {
   /*
    * Close all open files...
    */

    getrlimit(RLIMIT_NOFILE, &limit);

    for (i = 0; i < (int)limit.rlim_cur && i < 1024; i ++)
      close(i);

   /*
    * Redirect stdin/out/err to /dev/null...
    */

    if ((i = open("/dev/null", O_RDONLY)) != 0)
    {
      dup2(i, 0);
      close(i);
    }

    if ((i = open("/dev/null", O_WRONLY)) != 1)
    {
      dup2(i, 1);
      close(i);
    }

    if ((i = open("/dev/null", O_WRONLY)) != 2)
    {
      dup2(i, 2);
      close(i);
    }
  }
  else
    LogStderr = cupsFileStderr();

 /*
  * Run in the background as needed...
  */

  if (!fg)
  {
   /*
    * Setup signal handlers for the parent...
    */

#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
    sigset(SIGUSR1, parent_handler);
    sigset(SIGCHLD, parent_handler);

    sigset(SIGHUP, SIG_IGN);
#elif defined(HAVE_SIGACTION)
    memset(&action, 0, sizeof(action));
    sigemptyset(&action.sa_mask);
    sigaddset(&action.sa_mask, SIGUSR1);
    action.sa_handler = parent_handler;
    sigaction(SIGUSR1, &action, NULL);
    sigaction(SIGCHLD, &action, NULL);

    sigemptyset(&action.sa_mask);
    action.sa_handler = SIG_IGN;
    sigaction(SIGHUP, &action, NULL);
#else
    signal(SIGUSR1, parent_handler);
    signal(SIGCLD, parent_handler);

    signal(SIGHUP, SIG_IGN);
#endif /* HAVE_SIGSET */

    if (fork() > 0)
    {
     /*
      * OK, wait for the child to startup and send us SIGUSR1 or to crash
      * and the OS send us SIGCHLD...  We also need to ignore SIGHUP which
      * might be sent by the init script to restart the scheduler...
      */

      for (; parent_signal == 0;)
        sleep(1);

      if (parent_signal == SIGUSR1)
        return (0);

      if (wait(&i) < 0)
      {
        perror("cupsd");
	return (1);
      }
      else if (WIFEXITED(i))
      {
        fprintf(stderr, "cupsd: Child exited with status %d\n",
	        WEXITSTATUS(i));
	return (2);
      }
      else
      {
        fprintf(stderr, "cupsd: Child exited on signal %d\n", WTERMSIG(i));
	return (3);
      }
    }

#if defined(__OpenBSD__) && OpenBSD < 201211
   /*
    * Call _thread_sys_closefrom() so the child process doesn't reset the
    * parent's file descriptors to be blocking.  This is a workaround for a
    * limitation of userland libpthread on older versions of OpenBSD.
    */

    _thread_sys_closefrom(0);
#endif /* __OpenBSD__ && OpenBSD < 201211 */

   /*
    * Since many system libraries create fork-unsafe data on execution of a
    * program, we need to re-execute the background cupsd with the "-C" and "-s"
    * options to avoid problems.  Unfortunately, we also have to assume that
    * argv[0] contains the name of the cupsd executable - there is no portable
    * way to get the real pathname...
    */

    execlp(argv[0], argv[0], "-C", ConfigurationFile, "-s", CupsFilesFile, (char *)0);
    exit(errno);
  }

 /*
  * Set the timezone info...
  */

  tzset();

#ifdef LC_TIME
  setlocale(LC_TIME, "");
#endif /* LC_TIME */

#ifdef HAVE_DBUS_THREADS_INIT
 /*
  * Enable threading support for D-BUS...
  */

  dbus_threads_init_default();
#endif /* HAVE_DBUS_THREADS_INIT */

 /*
  * Set the maximum number of files...
  */

  getrlimit(RLIMIT_NOFILE, &limit);

#if !defined(HAVE_POLL) && !defined(HAVE_EPOLL) && !defined(HAVE_KQUEUE)
  if (limit.rlim_max > FD_SETSIZE)
    MaxFDs = FD_SETSIZE;
  else
#endif /* !HAVE_POLL && !HAVE_EPOLL && !HAVE_KQUEUE */
#ifdef RLIM_INFINITY
  if (limit.rlim_max == RLIM_INFINITY)
    MaxFDs = 16384;
  else
#endif /* RLIM_INFINITY */
    MaxFDs = limit.rlim_max;

  limit.rlim_cur = (rlim_t)MaxFDs;

  setrlimit(RLIMIT_NOFILE, &limit);

  cupsdStartSelect();

 /*
  * Read configuration...
  */

  if (!cupsdReadConfiguration())
    return (1);
  else if (TestConfigFile)
  {
    printf("\"%s\" is OK.\n", CupsFilesFile);
    printf("\"%s\" is OK.\n", ConfigurationFile);
    return (0);
  }
  else if (print_profile)
  {
    cups_file_t	*fp;			/* File pointer */
    const char	*profile = cupsdCreateProfile(42, 0);
					/* Profile */
    char	line[1024];		/* Line from file */


    if ((fp = cupsFileOpen(profile, "r")) == NULL)
    {
      printf("Unable to open profile file \"%s\": %s\n", profile ? profile : "(null)", strerror(errno));
      return (1);
    }

    while (cupsFileGets(fp, line, sizeof(line)))
      puts(line);

    cupsFileClose(fp);

    return (0);
  }

 /*
  * Clean out old temp files and printer cache data.
  */

  if (!strncmp(TempDir, RequestRoot, strlen(RequestRoot)))
    cupsdCleanFiles(TempDir, NULL);

  cupsdCleanFiles(CacheDir, "*.ipp");

#if defined(HAVE_ONDEMAND)
  if (OnDemand)
  {
   /*
    * If we were started on demand by launchd or systemd get the listen sockets
    * file descriptors...
    */

    service_checkin();
    service_checkout();
  }
#endif /* HAVE_ONDEMAND */

 /*
  * Startup the server...
  */

  httpInitialize();

  cupsdStartServer();

 /*
  * Catch hangup and child signals and ignore broken pipes...
  */

#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
  sigset(SIGCHLD, sigchld_handler);
  sigset(SIGHUP, sighup_handler);
  sigset(SIGPIPE, SIG_IGN);
  sigset(SIGTERM, sigterm_handler);
#elif defined(HAVE_SIGACTION)
  memset(&action, 0, sizeof(action));

  sigemptyset(&action.sa_mask);
  sigaddset(&action.sa_mask, SIGTERM);
  sigaddset(&action.sa_mask, SIGCHLD);
  action.sa_handler = sigchld_handler;
  sigaction(SIGCHLD, &action, NULL);

  sigemptyset(&action.sa_mask);
  sigaddset(&action.sa_mask, SIGHUP);
  action.sa_handler = sighup_handler;
  sigaction(SIGHUP, &action, NULL);

  sigemptyset(&action.sa_mask);
  action.sa_handler = SIG_IGN;
  sigaction(SIGPIPE, &action, NULL);

  sigemptyset(&action.sa_mask);
  sigaddset(&action.sa_mask, SIGTERM);
  sigaddset(&action.sa_mask, SIGCHLD);
  action.sa_handler = sigterm_handler;
  sigaction(SIGTERM, &action, NULL);
#else
  signal(SIGCLD, sigchld_handler);	/* No, SIGCLD isn't a typo... */
  signal(SIGHUP, sighup_handler);
  signal(SIGPIPE, SIG_IGN);
  signal(SIGTERM, sigterm_handler);
#endif /* HAVE_SIGSET */

 /*
  * Initialize authentication certificates...
  */

  cupsdInitCerts();

 /*
  * If we are running in the background, signal the parent process that
  * we are up and running...
  */

  if (!fg || run_as_child)
  {
   /*
    * Send a signal to the parent process, but only if the parent is
    * not PID 1 (init).  This avoids accidentally shutting down the
    * system on OpenBSD if you CTRL-C the server before it is up...
    */

    i = getppid();	/* Save parent PID to avoid race condition */

    if (i != 1)
      kill(i, SIGUSR1);
  }

#ifdef __APPLE__
 /*
  * Start power management framework...
  */

  if (use_sysman)
    cupsdStartSystemMonitor();
#endif /* __APPLE__ */

 /*
  * Send server-started event...
  */

#if defined(HAVE_ONDEMAND)
  if (OnDemand)
    cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started on demand.");
  else
#endif /* HAVE_ONDEMAND */
  if (fg)
    cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started in foreground.");
  else
    cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started in background.");

 /*
  * Start any pending print jobs...
  */

  cupsdCheckJobs();

 /*
  * Loop forever...
  */

  current_time  = time(NULL);
  event_time    = current_time;
  expire_time   = current_time;
  fds           = 1;
  report_time   = 0;
  senddoc_time  = current_time;

  while (!stop_scheduler)
  {
   /*
    * Check if there are dead children to handle...
    */

    if (dead_children)
      process_children();

   /*
    * Check if we need to load the server configuration file...
    */

    if (NeedReload)
    {
     /*
      * Close any idle clients...
      */

      if (cupsArrayCount(Clients) > 0)
      {
	for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
	     con;
	     con = (cupsd_client_t *)cupsArrayNext(Clients))
	  if (httpGetState(con->http) == HTTP_WAITING)
	    cupsdCloseClient(con);
	  else
	    con->http->keep_alive = HTTP_KEEPALIVE_OFF;

        cupsdPauseListening();
      }

     /*
      * Restart if all clients are closed and all jobs finished, or
      * if the reload timeout has elapsed...
      */

      if ((cupsArrayCount(Clients) == 0 &&
           (cupsArrayCount(PrintingJobs) == 0 || NeedReload != RELOAD_ALL)) ||
          (time(NULL) - ReloadTime) >= ReloadTimeout)
      {
       /*
	* Shutdown the server...
	*/

#ifdef HAVE_ONDEMAND
	if (OnDemand)
	  break;
#endif /* HAVE_ONDEMAND */

        DoingShutdown = 1;

	cupsdStopServer();

       /*
	* Read configuration...
	*/

        if (!cupsdReadConfiguration())
        {
#ifdef HAVE_SYSTEMD_SD_JOURNAL_H
	  sd_journal_print(LOG_ERR, "Unable to read configuration file \"%s\" - exiting.", ConfigurationFile);
#else
          syslog(LOG_LPR, "Unable to read configuration file \'%s\' - exiting.", ConfigurationFile);
#endif /* HAVE_SYSTEMD_SD_JOURNAL_H */

          break;
	}

       /*
        * Startup the server...
        */

        DoingShutdown = 0;

        cupsdStartServer();

       /*
        * Send a server-restarted event...
	*/

        cupsdAddEvent(CUPSD_EVENT_SERVER_RESTARTED, NULL, NULL,
                      "Scheduler restarted.");
      }
    }

   /*
    * Check for available input or ready output.  If cupsdDoSelect()
    * returns 0 or -1, something bad happened and we should exit
    * immediately.
    *
    * Note that we at least have one listening socket open at all
    * times.
    */

    if ((timeout = select_timeout(fds)) > 1 && LastEvent)
      timeout = 1;

#ifdef HAVE_ONDEMAND
   /*
    * If no other work is scheduled and we're being controlled by
    * launchd then timeout after 'LaunchdTimeout' seconds of
    * inactivity...
    */

    if (timeout == 86400 && OnDemand && IdleExitTimeout &&
        !cupsArrayCount(ActiveJobs) &&
#  ifdef HAVE_SYSTEMD
        !WebInterface &&
#  endif /* HAVE_SYSTEMD */
	(!Browsing || !BrowseLocalProtocols || !cupsArrayCount(Printers)))
    {
      timeout		= IdleExitTimeout;
      service_idle_exit = 1;
    }
    else
      service_idle_exit = 0;
#endif	/* HAVE_ONDEMAND */

    if ((fds = cupsdDoSelect(timeout)) < 0)
    {
     /*
      * Got an error from select!
      */

#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
      cupsd_printer_t	*p;		/* Current printer */
#endif /* HAVE_DNSSD || HAVE_AVAHI */

      if (errno == EINTR)		/* Just interrupted by a signal */
        continue;

     /*
      * Log all sorts of debug info to help track down the problem.
      */

      cupsdLogMessage(CUPSD_LOG_EMERG, "cupsdDoSelect() failed - %s!",
                      strerror(errno));

      for (i = 0, con = (cupsd_client_t *)cupsArrayFirst(Clients);
	   con;
	   i ++, con = (cupsd_client_t *)cupsArrayNext(Clients))
        cupsdLogMessage(CUPSD_LOG_EMERG,
	                "Clients[%d] = %d, file = %d, state = %d",
	                i, con->number, con->file, httpGetState(con->http));

      for (i = 0, lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
           lis;
	   i ++, lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
        cupsdLogMessage(CUPSD_LOG_EMERG, "Listeners[%d] = %d", i, lis->fd);

      cupsdLogMessage(CUPSD_LOG_EMERG, "CGIPipes[0] = %d", CGIPipes[0]);

#ifdef __APPLE__
      cupsdLogMessage(CUPSD_LOG_EMERG, "SysEventPipes[0] = %d",
                      SysEventPipes[0]);
#endif /* __APPLE__ */

      for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs);
	   job;
	   job = (cupsd_job_t *)cupsArrayNext(ActiveJobs))
        cupsdLogMessage(CUPSD_LOG_EMERG, "Jobs[%d] = %d < [%d %d] > [%d %d]",
	        	job->id,
			job->status_buffer ? job->status_buffer->fd : -1,
			job->print_pipes[0], job->print_pipes[1],
			job->back_pipes[0], job->back_pipes[1]);

#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
      for (p = (cupsd_printer_t *)cupsArrayFirst(Printers);
	   p;
	   p = (cupsd_printer_t *)cupsArrayNext(Printers))
        cupsdLogMessage(CUPSD_LOG_EMERG, "printer[%s] reg_name=\"%s\"", p->name,
	                p->reg_name ? p->reg_name : "(null)");
#endif /* HAVE_DNSSD || HAVE_AVAHI */

      break;
    }

    current_time = time(NULL);

   /*
    * Write dirty config/state files...
    */

    if (DirtyCleanTime && current_time >= DirtyCleanTime)
      cupsdCleanDirty();

#ifdef __APPLE__
   /*
    * If we are going to sleep and still have pending jobs, stop them after
    * a period of time...
    */

    if (SleepJobs > 0 && current_time >= SleepJobs &&
        cupsArrayCount(PrintingJobs) > 0)
    {
      SleepJobs = 0;
      cupsdStopAllJobs(CUPSD_JOB_DEFAULT, 5);
    }
#endif /* __APPLE__ */

#ifndef __APPLE__
   /*
    * Update the network interfaces once a minute...
    */

    if ((current_time - netif_time) >= 60)
    {
      netif_time  = current_time;
      NetIFUpdate = 1;
    }
#endif /* !__APPLE__ */

#ifdef HAVE_ONDEMAND
   /*
    * If no other work was scheduled and we're being controlled by launchd,
    * systemd, or upstart then timeout after 'LaunchdTimeout' seconds of
    * inactivity...
    */

    if (!fds && service_idle_exit)
    {
      cupsdLogMessage(CUPSD_LOG_INFO,
                      "Printer sharing is off and there are no jobs pending, "
		      "will restart on demand.");
      stop_scheduler = 1;
      break;
    }
#endif /* HAVE_ONDEMAND */

   /*
    * Resume listening for new connections as needed...
    */

    if (ListeningPaused && ListeningPaused <= current_time &&
        cupsArrayCount(Clients) < MaxClients)
      cupsdResumeListening();

   /*
    * Expire subscriptions and unload completed jobs as needed...
    */

    if (current_time > expire_time)
    {
      if (cupsArrayCount(Subscriptions) > 0)
        cupsdExpireSubscriptions(NULL, NULL);

      cupsdUnloadCompletedJobs();

      expire_time = current_time;
    }

#ifndef HAVE_AUTHORIZATION_H
   /*
    * Update the root certificate once every 5 minutes if we have client
    * connections...
    */

    if ((current_time - RootCertTime) >= RootCertDuration && RootCertDuration &&
        !RunUser && cupsArrayCount(Clients))
    {
     /*
      * Update the root certificate...
      */

      cupsdDeleteCert(0);
      cupsdAddCert(0, "root", cupsdDefaultAuthType());
    }
#endif /* !HAVE_AUTHORIZATION_H */

   /*
    * Check for new data on the client sockets...
    */

    for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
	 con;
	 con = (cupsd_client_t *)cupsArrayNext(Clients))
    {
     /*
      * Process pending data in the input buffer...
      */

      if (httpGetReady(con->http))
      {
        cupsdReadClient(con);
	continue;
      }

     /*
      * Check the activity and close old clients...
      */

      activity = current_time - Timeout;
      if (httpGetActivity(con->http) < activity && !con->pipe_pid)
      {
        cupsdLogMessage(CUPSD_LOG_DEBUG, "Closing client %d after %d seconds of inactivity.", con->number, Timeout);

        cupsdCloseClient(con);
        continue;
      }
    }

   /*
    * Update any pending multi-file documents...
    */

    if ((current_time - senddoc_time) >= 10)
    {
      cupsdCheckJobs();
      senddoc_time = current_time;
    }

   /*
    * Clean job history...
    */

    if (JobHistoryUpdate && current_time >= JobHistoryUpdate)
      cupsdCleanJobs();

   /*
    * Log statistics at most once a minute when in debug mode...
    */

    if ((current_time - report_time) >= 60 && LogLevel >= CUPSD_LOG_DEBUG)
    {
      size_t		string_count,	/* String count */
			alloc_bytes,	/* Allocated string bytes */
			total_bytes;	/* Total string bytes */
#ifdef HAVE_MALLINFO
      struct mallinfo	mem;		/* Malloc information */


      mem = mallinfo();
      cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: malloc-arena=%lu", mem.arena);
      cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: malloc-used=%lu",
                      mem.usmblks + mem.uordblks);
      cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: malloc-free=%lu",
		      mem.fsmblks + mem.fordblks);
#endif /* HAVE_MALLINFO */

      cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: clients=%d",
                      cupsArrayCount(Clients));
      cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: jobs=%d",
                      cupsArrayCount(Jobs));
      cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: jobs-active=%d",
                      cupsArrayCount(ActiveJobs));
      cupsdLogMessage(CUPSD_LOG_DEBUG, "Report: printers=%d",
                      cupsArrayCount(Printers));

      string_count = _cupsStrStatistics(&alloc_bytes, &total_bytes);
      cupsdLogMessage(CUPSD_LOG_DEBUG,
                      "Report: stringpool-string-count=" CUPS_LLFMT,
		      CUPS_LLCAST string_count);
      cupsdLogMessage(CUPSD_LOG_DEBUG,
                      "Report: stringpool-alloc-bytes=" CUPS_LLFMT,
		      CUPS_LLCAST alloc_bytes);
      cupsdLogMessage(CUPSD_LOG_DEBUG,
                      "Report: stringpool-total-bytes=" CUPS_LLFMT,
		      CUPS_LLCAST total_bytes);

      report_time = current_time;
    }

   /*
    * Handle OS-specific event notification for any events that have
    * accumulated.  Don't send these more than once a second...
    */

    if (LastEvent && (current_time - event_time) >= 1)
    {
#ifdef HAVE_NOTIFY_POST
      if (LastEvent & (CUPSD_EVENT_PRINTER_ADDED |
                       CUPSD_EVENT_PRINTER_DELETED |
                       CUPSD_EVENT_PRINTER_MODIFIED))
      {
        cupsdLogMessage(CUPSD_LOG_DEBUG2,
	                "notify_post(\"com.apple.printerListChange\")");
	notify_post("com.apple.printerListChange");
      }

      if (LastEvent & CUPSD_EVENT_PRINTER_STATE_CHANGED)
      {
        cupsdLogMessage(CUPSD_LOG_DEBUG2,
	                "notify_post(\"com.apple.printerHistoryChange\")");
	notify_post("com.apple.printerHistoryChange");
      }

      if (LastEvent & (CUPSD_EVENT_JOB_STATE_CHANGED |
                       CUPSD_EVENT_JOB_CONFIG_CHANGED |
                       CUPSD_EVENT_JOB_PROGRESS))
      {
        cupsdLogMessage(CUPSD_LOG_DEBUG2,
	                "notify_post(\"com.apple.jobChange\")");
	notify_post("com.apple.jobChange");
      }
#endif /* HAVE_NOTIFY_POST */

     /*
      * Reset the accumulated events...
      */

      LastEvent  = CUPSD_EVENT_NONE;
      event_time = current_time;
    }
  }

 /*
  * Log a message based on what happened...
  */

  if (stop_scheduler)
  {
    cupsdLogMessage(CUPSD_LOG_INFO, "Scheduler shutting down normally.");
    cupsdAddEvent(CUPSD_EVENT_SERVER_STOPPED, NULL, NULL,
                  "Scheduler shutting down normally.");
  }
  else
  {
    cupsdLogMessage(CUPSD_LOG_ERROR,
                    "Scheduler shutting down due to program error.");
    cupsdAddEvent(CUPSD_EVENT_SERVER_STOPPED, NULL, NULL,
                  "Scheduler shutting down due to program error.");
  }

 /*
  * Close all network clients...
  */

  DoingShutdown = 1;

  cupsdStopServer();

#ifdef HAVE_ONDEMAND
 /*
  * Update the keep-alive file as needed...
  */

  if (OnDemand)
    service_checkout();
#endif /* HAVE_ONDEMAND */

 /*
  * Stop all jobs...
  */

  cupsdFreeAllJobs();

#ifdef __APPLE__
 /*
  * Stop monitoring system event monitoring...
  */

  if (use_sysman)
    cupsdStopSystemMonitor();
#endif /* __APPLE__ */

  cupsdStopSelect();

  return (!stop_scheduler);
}