bus/at-spi-bus-launcher.c

   1 /* -*- mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
   2  *
   3  * at-spi-bus-launcher: Manage the a11y bus as a child process
   4  *
   5  * Copyright 2011 Red Hat, Inc.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include "config.h"
  24
  25 #include <unistd.h>
  26 #include <string.h>
  27 #include <signal.h>
  28 #include <sys/wait.h>
  29 #include <errno.h>
  30 #include <stdio.h>
  31
  32 #include <gio/gio.h>
  33 #ifdef HAVE_X11
  34 #include <X11/Xlib.h>
  35 #include <X11/Xatom.h>
  36 #endif
  37
  38 #define APP_CONTROL_OPERATION_SCREEN_READ "http://tizen.org/appcontrol/operation/read_screen"
  39 #include <appsvc.h>
  40 #include <vconf.h>
  41
  42 //uncomment if you want debug
  43 //#ifndef TIZEN_ENGINEER_MODE
  44 //#define TIZEN_ENGINEER_MODE
  45 //#endif
  46 #ifdef LOG_TAG
  47 #undef LOG_TAG
  48 #endif
  49
  50 #define LOG_TAG "ATSPI_BUS_LAUNCHER"
  51
  52 #include <dlog.h>
  53 #include <aul.h>
  54
  55 //uncomment this if you want log suring startup
  56 //seems like dlog is not working at startup time
  57 #define ATSPI_BUS_LAUNCHER_LOG_TO_FILE
  58
  59 #ifdef ATSPI_BUS_LAUNCHER_LOG_TO_FILE
  60 FILE *log_file;
  61 #ifdef LOGD
  62 #undef LOGD
  63 #endif
  64 #define LOGD(arg...) do {if (log_file) {fprintf(log_file, ##arg);fprintf(log_file, "\n"); fflush(log_file);}} while(0)
  65 #endif
  66
  67
  68 typedef enum {
  69   A11Y_BUS_STATE_IDLE = 0,
  70   A11Y_BUS_STATE_READING_ADDRESS,
  71   A11Y_BUS_STATE_RUNNING,
  72   A11Y_BUS_STATE_ERROR
  73 } A11yBusState;
  74
  75 typedef struct {
  76   GMainLoop *loop;
  77   gboolean launch_immediately;
  78   gboolean a11y_enabled;
  79   gboolean screen_reader_enabled;
  80   GDBusConnection *session_bus;
  81   GSettings *a11y_schema;
  82   GSettings *interface_schema;
  83
  84   int launch_screen_reader_repeats;
  85   gboolean screen_reader_needed;
  86   int pid;
  87
  88   A11yBusState state;
  89
  90   /* -1 == error, 0 == pending, > 0 == running */
  91   int a11y_bus_pid;
  92   char *a11y_bus_address;
  93   int pipefd[2];
  94   char *a11y_launch_error_message;
  95 } A11yBusLauncher;
  96
  97 static A11yBusLauncher *_global_app = NULL;
  98
  99 static const gchar introspection_xml[] =
 100   "<node>"
 101   "  <interface name='org.a11y.Bus'>"
 102   "    <method name='GetAddress'>"
 103   "      <arg type='s' name='address' direction='out'/>"
 104   "    </method>"
 105   "  </interface>"
 106   "<interface name='org.a11y.Status'>"
 107   "<property name='IsEnabled' type='b' access='readwrite'/>"
 108   "<property name='ScreenReaderEnabled' type='b' access='readwrite'/>"
 109   "</interface>"
 110   "</node>";
 111 static GDBusNodeInfo *introspection_data = NULL;
 112
 113 static void
 114 setup_bus_child (gpointer data)
 115 {
 116   A11yBusLauncher *app = data;
 117   (void) app;
 118
 119   close (app->pipefd[0]);
 120   dup2 (app->pipefd[1], 3);
 121   close (app->pipefd[1]);
 122
 123   /* On Linux, tell the bus process to exit if this process goes away */
 124 #ifdef __linux
 125 #include <sys/prctl.h>
 126   prctl (PR_SET_PDEATHSIG, 15);
 127 #endif
 128 }
 129
 130 /**
 131  * unix_read_all_fd_to_string:
 132  *
 133  * Read all data from a file descriptor to a C string buffer.
 134  */
 135 static gboolean
 136 unix_read_all_fd_to_string (int      fd,
 137                             char    *buf,
 138                             ssize_t  max_bytes)
 139 {
 140   ssize_t bytes_read;
 141
 142   while (max_bytes > 1 && (bytes_read = read (fd, buf, MAX (4096, max_bytes - 1))))
 143     {
 144       if (bytes_read < 0)
 145         return FALSE;
 146       buf += bytes_read;
 147       max_bytes -= bytes_read;
 148     }
 149   *buf = '\0';
 150   return TRUE;
 151 }
 152
 153 static void
 154 on_bus_exited (GPid     pid,
 155                gint     status,
 156                gpointer data)
 157 {
 158   A11yBusLauncher *app = data;
 159
 160   app->a11y_bus_pid = -1;
 161   app->state = A11Y_BUS_STATE_ERROR;
 162   if (app->a11y_launch_error_message == NULL)
 163     {
 164       if (WIFEXITED (status))
 165         app->a11y_launch_error_message = g_strdup_printf ("Bus exited with code %d", WEXITSTATUS (status));
 166       else if (WIFSIGNALED (status))
 167         app->a11y_launch_error_message = g_strdup_printf ("Bus killed by signal %d", WTERMSIG (status));
 168       else if (WIFSTOPPED (status))
 169         app->a11y_launch_error_message = g_strdup_printf ("Bus stopped by signal %d", WSTOPSIG (status));
 170     }
 171   g_main_loop_quit (app->loop);
 172 }
 173
 174 static gboolean
 175 ensure_a11y_bus (A11yBusLauncher *app)
 176 {
 177   GPid pid;
 178   char *argv[] = { DBUS_DAEMON, NULL, "--nofork", "--print-address", "3", NULL };
 179   char addr_buf[2048];
 180   GError *error = NULL;
 181
 182   if (app->a11y_bus_pid != 0)
 183     return FALSE;
 184
 185   argv[1] = g_strdup_printf ("--config-file=%s/at-spi2/accessibility.conf", SYSCONFDIR);
 186
 187   if (pipe (app->pipefd) < 0)
 188     g_error ("Failed to create pipe: %s", strerror (errno));
 189
 190   if (!g_spawn_async (NULL,
 191                       argv,
 192                       NULL,
 193                       G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
 194                       setup_bus_child,
 195                       app,
 196                       &pid,
 197                       &error))
 198     {
 199       app->a11y_bus_pid = -1;
 200       app->a11y_launch_error_message = g_strdup (error->message);
 201       g_clear_error (&error);
 202       goto error;
 203     }
 204
 205   close (app->pipefd[1]);
 206   app->pipefd[1] = -1;
 207
 208   g_child_watch_add (pid, on_bus_exited, app);
 209
 210   app->state = A11Y_BUS_STATE_READING_ADDRESS;
 211   app->a11y_bus_pid = pid;
 212   LOGD("Launched a11y bus, child is %ld", (long) pid);
 213   if (!unix_read_all_fd_to_string (app->pipefd[0], addr_buf, sizeof (addr_buf)))
 214     {
 215       app->a11y_launch_error_message = g_strdup_printf ("Failed to read address: %s", strerror (errno));
 216       kill (app->a11y_bus_pid, SIGTERM);
 217       goto error;
 218     }
 219   close (app->pipefd[0]);
 220   app->pipefd[0] = -1;
 221   app->state = A11Y_BUS_STATE_RUNNING;
 222
 223   /* Trim the trailing newline */
 224   app->a11y_bus_address = g_strchomp (g_strdup (addr_buf));
 225   LOGD("a11y bus address: %s", app->a11y_bus_address);
 226
 227 #ifdef HAVE_X11
 228   {
 229     Display *display = XOpenDisplay (NULL);
 230     if (display)
 231       {
 232         Atom bus_address_atom = XInternAtom (display, "AT_SPI_BUS", False);
 233         XChangeProperty (display,
 234                          XDefaultRootWindow (display),
 235                          bus_address_atom,
 236                          XA_STRING, 8, PropModeReplace,
 237                          (guchar *) app->a11y_bus_address, strlen (app->a11y_bus_address));
 238         XFlush (display);
 239         XCloseDisplay (display);
 240       }
 241   }
 242 #endif
 243
 244   if (argv[1]) g_free(argv[1]);
 245
 246   return TRUE;
 247
 248  error:
 249   if (argv[1]) g_free(argv[1]);
 250   close (app->pipefd[0]);
 251   close (app->pipefd[1]);
 252   app->state = A11Y_BUS_STATE_ERROR;
 253
 254   return FALSE;
 255 }
 256
 257 static void
 258 handle_method_call (GDBusConnection       *connection,
 259                     const gchar           *sender,
 260                     const gchar           *object_path,
 261                     const gchar           *interface_name,
 262                     const gchar           *method_name,
 263                     GVariant              *parameters,
 264                     GDBusMethodInvocation *invocation,
 265                     gpointer               user_data)
 266 {
 267   A11yBusLauncher *app = user_data;
 268
 269   if (g_strcmp0 (method_name, "GetAddress") == 0)
 270     {
 271       ensure_a11y_bus (app);
 272       if (app->a11y_bus_pid > 0)
 273         g_dbus_method_invocation_return_value (invocation,
 274                                                g_variant_new ("(s)", app->a11y_bus_address));
 275       else
 276         g_dbus_method_invocation_return_dbus_error (invocation,
 277                                                     "org.a11y.Bus.Error",
 278                                                     app->a11y_launch_error_message);
 279     }
 280 }
 281
 282 static GVariant *
 283 handle_get_property  (GDBusConnection       *connection,
 284                       const gchar           *sender,
 285                       const gchar           *object_path,
 286                       const gchar           *interface_name,
 287                       const gchar           *property_name,
 288                     GError **error,
 289                     gpointer               user_data)
 290 {
 291   A11yBusLauncher *app = user_data;
 292
 293   if (g_strcmp0 (property_name, "IsEnabled") == 0)
 294     return g_variant_new ("b", app->a11y_enabled);
 295   else if (g_strcmp0 (property_name, "ScreenReaderEnabled") == 0)
 296     return g_variant_new ("b", app->screen_reader_enabled);
 297   else
 298     return NULL;
 299 }
 300
 301 static void
 302 handle_a11y_enabled_change (A11yBusLauncher *app, gboolean enabled,
 303                                gboolean notify_gsettings)
 304 {
 305   GVariantBuilder builder;
 306   GVariantBuilder invalidated_builder;
 307
 308   if (enabled == app->a11y_enabled)
 309     return;
 310
 311   app->a11y_enabled = enabled;
 312
 313   if (notify_gsettings && app->interface_schema)
 314     {
 315       g_settings_set_boolean (app->interface_schema, "toolkit-accessibility",
 316                               enabled);
 317       g_settings_sync ();
 318     }
 319
 320   g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
 321   g_variant_builder_init (&invalidated_builder, G_VARIANT_TYPE ("as"));
 322   g_variant_builder_add (&builder, "{sv}", "IsEnabled",
 323                          g_variant_new_boolean (enabled));
 324
 325   g_dbus_connection_emit_signal (app->session_bus, NULL, "/org/a11y/bus",
 326                                  "org.freedesktop.DBus.Properties",
 327                                  "PropertiesChanged",
 328                                  g_variant_new ("(sa{sv}as)", "org.a11y.Status",
 329                                                 &builder,
 330                                                 &invalidated_builder),
 331                                  NULL);
 332 }
 333
 334 static void
 335 handle_screen_reader_enabled_change (A11yBusLauncher *app, gboolean enabled,
 336                                gboolean notify_gsettings)
 337 {
 338   GVariantBuilder builder;
 339   GVariantBuilder invalidated_builder;
 340
 341   if (enabled == app->screen_reader_enabled)
 342     return;
 343
 344   /* If the screen reader is being enabled, we should enable accessibility
 345    * if it isn't enabled already */
 346   if (enabled)
 347     handle_a11y_enabled_change (app, enabled, notify_gsettings);
 348
 349   app->screen_reader_enabled = enabled;
 350
 351   if (notify_gsettings && app->a11y_schema)
 352     {
 353       g_settings_set_boolean (app->a11y_schema, "screen-reader-enabled",
 354                               enabled);
 355       g_settings_sync ();
 356     }
 357
 358   g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
 359   g_variant_builder_init (&invalidated_builder, G_VARIANT_TYPE ("as"));
 360   g_variant_builder_add (&builder, "{sv}", "ScreenReaderEnabled",
 361                          g_variant_new_boolean (enabled));
 362
 363   g_dbus_connection_emit_signal (app->session_bus, NULL, "/org/a11y/bus",
 364                                  "org.freedesktop.DBus.Properties",
 365                                  "PropertiesChanged",
 366                                  g_variant_new ("(sa{sv}as)", "org.a11y.Status",
 367                                                 &builder,
 368                                                 &invalidated_builder),
 369                                  NULL);
 370 }
 371
 372 static gboolean
 373 handle_set_property  (GDBusConnection       *connection,
 374                       const gchar           *sender,
 375                       const gchar           *object_path,
 376                       const gchar           *interface_name,
 377                       const gchar           *property_name,
 378                       GVariant *value,
 379                     GError **error,
 380                     gpointer               user_data)
 381 {
 382   A11yBusLauncher *app = user_data;
 383   const gchar *type = g_variant_get_type_string (value);
 384   gboolean enabled;
 385
 386   if (g_strcmp0 (type, "b") != 0)
 387     {
 388       g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
 389                        "org.a11y.Status.%s expects a boolean but got %s", property_name, type);
 390       return FALSE;
 391     }
 392
 393   enabled = g_variant_get_boolean (value);
 394
 395   if (g_strcmp0 (property_name, "IsEnabled") == 0)
 396     {
 397       handle_a11y_enabled_change (app, enabled, TRUE);
 398       return TRUE;
 399     }
 400   else if (g_strcmp0 (property_name, "ScreenReaderEnabled") == 0)
 401     {
 402       handle_screen_reader_enabled_change (app, enabled, TRUE);
 403       return TRUE;
 404     }
 405   else
 406     {
 407       g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
 408                        "Unknown property '%s'", property_name);
 409       return FALSE;
 410     }
 411 }
 412
 413 static const GDBusInterfaceVTable bus_vtable =
 414 {
 415   handle_method_call,
 416   NULL, /* handle_get_property, */
 417   NULL  /* handle_set_property */
 418 };
 419
 420 static const GDBusInterfaceVTable status_vtable =
 421 {
 422   NULL, /* handle_method_call */
 423   handle_get_property,
 424   handle_set_property
 425 };
 426
 427 static void
 428 on_bus_acquired (GDBusConnection *connection,
 429                  const gchar     *name,
 430                  gpointer         user_data)
 431 {
 432   A11yBusLauncher *app = user_data;
 433   GError *error;
 434   guint registration_id;
 435
 436   if (connection == NULL)
 437     {
 438       g_main_loop_quit (app->loop);
 439       return;
 440     }
 441   app->session_bus = connection;
 442
 443   if (app->launch_immediately)
 444     {
 445       ensure_a11y_bus (app);
 446       if (app->state == A11Y_BUS_STATE_ERROR)
 447         {
 448           g_main_loop_quit (app->loop);
 449           return;
 450         }
 451     }
 452
 453   error = NULL;
 454   registration_id = g_dbus_connection_register_object (connection,
 455                                                        "/org/a11y/bus",
 456                                                        introspection_data->interfaces[0],
 457                                                        &bus_vtable,
 458                                                        _global_app,
 459                                                        NULL,
 460                                                        &error);
 461   if (registration_id == 0)
 462     {
 463       g_error ("%s", error->message);
 464       g_clear_error (&error);
 465     }
 466
 467   g_dbus_connection_register_object (connection,
 468                                      "/org/a11y/bus",
 469                                      introspection_data->interfaces[1],
 470                                      &status_vtable,
 471                                      _global_app,
 472                                      NULL,
 473                                      NULL);
 474 }
 475
 476 static void
 477 on_name_lost (GDBusConnection *connection,
 478               const gchar     *name,
 479               gpointer         user_data)
 480 {
 481   A11yBusLauncher *app = user_data;
 482   if (app->session_bus == NULL
 483       && connection == NULL
 484       && app->a11y_launch_error_message == NULL)
 485     app->a11y_launch_error_message = g_strdup ("Failed to connect to session bus");
 486   g_main_loop_quit (app->loop);
 487 }
 488
 489 static void
 490 on_name_acquired (GDBusConnection *connection,
 491                   const gchar     *name,
 492                   gpointer         user_data)
 493 {
 494   A11yBusLauncher *app = user_data;
 495   (void) app;
 496 }
 497
 498 static int sigterm_pipefd[2];
 499
 500 static void
 501 sigterm_handler (int signum)
 502 {
 503   write (sigterm_pipefd[1], "X", 1);
 504 }
 505
 506 static gboolean
 507 on_sigterm_pipe (GIOChannel  *channel,
 508                  GIOCondition condition,
 509                  gpointer     data)
 510 {
 511   A11yBusLauncher *app = data;
 512
 513   g_main_loop_quit (app->loop);
 514
 515   return FALSE;
 516 }
 517
 518 static void
 519 init_sigterm_handling (A11yBusLauncher *app)
 520 {
 521   GIOChannel *sigterm_channel;
 522
 523   if (pipe (sigterm_pipefd) < 0)
 524     g_error ("Failed to create pipe: %s", strerror (errno));
 525   signal (SIGTERM, sigterm_handler);
 526
 527   sigterm_channel = g_io_channel_unix_new (sigterm_pipefd[0]);
 528   g_io_add_watch (sigterm_channel,
 529                   G_IO_IN | G_IO_ERR | G_IO_HUP,
 530                   on_sigterm_pipe,
 531                   app);
 532 }
 533
 534 static gboolean
 535 already_running ()
 536 {
 537 #ifdef HAVE_X11
 538   Atom AT_SPI_BUS;
 539   Atom actual_type;
 540   Display *bridge_display;
 541   int actual_format;
 542   unsigned char *data = NULL;
 543   unsigned long nitems;
 544   unsigned long leftover;
 545   gboolean result = FALSE;
 546
 547   bridge_display = XOpenDisplay (NULL);
 548   if (!bridge_display)
 549               return FALSE;
 550
 551   AT_SPI_BUS = XInternAtom (bridge_display, "AT_SPI_BUS", False);
 552   XGetWindowProperty (bridge_display,
 553                       XDefaultRootWindow (bridge_display),
 554                       AT_SPI_BUS, 0L,
 555                       (long) BUFSIZ, False,
 556                       (Atom) 31, &actual_type, &actual_format,
 557                       &nitems, &leftover, &data);
 558
 559   if (data)
 560   {
 561     GDBusConnection *bus;
 562     bus = g_dbus_connection_new_for_address_sync ((const gchar *)data, 0,
 563                                                   NULL, NULL, NULL);
 564     if (bus != NULL)
 565       {
 566         result = TRUE;
 567         g_object_unref (bus);
 568       }
 569   }
 570
 571   XCloseDisplay (bridge_display);
 572   return result;
 573 #else
 574   return FALSE;
 575 #endif
 576 }
 577
 578 static GSettings *
 579 get_schema (const gchar *name)
 580 {
 581   const char * const *schemas = NULL;
 582   gint i;
 583
 584   schemas = g_settings_list_schemas ();
 585   for (i = 0; schemas[i]; i++)
 586   {
 587     if (!strcmp (schemas[i], name))
 588       return g_settings_new (schemas[i]);
 589   }
 590
 591   return NULL;
 592 }
 593
 594 static void
 595 gsettings_key_changed (GSettings *gsettings, const gchar *key, void *user_data)
 596 {
 597   gboolean new_val = g_settings_get_boolean (gsettings, key);
 598   A11yBusLauncher *app = user_data;
 599
 600   if (!strcmp (key, "toolkit-accessibility"))
 601     handle_a11y_enabled_change (_global_app, new_val, FALSE);
 602   else if (!strcmp (key, "screen-reader-enabled"))
 603     handle_screen_reader_enabled_change (_global_app, new_val, FALSE);
 604 }
 605
 606 static gboolean
 607 _launch_screen_reader(gpointer user_data)
 608 {
 609    A11yBusLauncher *bl = user_data;
 610    LOGD("Launching screen reader");
 611
 612    bundle *kb = NULL;
 613    gboolean ret = FALSE;
 614
 615    kb = bundle_create();
 616
 617    if (kb == NULL)
 618      {
 619         LOGD("Can't create bundle");
 620         return FALSE;
 621      }
 622    int operation_error = appsvc_set_operation(kb, APP_CONTROL_OPERATION_SCREEN_READ);
 623    LOGD("appsvc_set_operation: %i", operation_error);
 624
 625    bl->pid = appsvc_run_service(kb, 0, NULL, NULL);
 626
 627    if (bl->pid > 0)
 628      {
 629         LOGD("Screen reader launched with pid: %i", bl->pid);
 630         ret = TRUE;
 631      }
 632    else
 633      {
 634         LOGD("Can't start screen-reader - error code: %i", bl->pid);
 635      }
 636
 637
 638    bundle_free(kb);
 639    return ret;
 640 }
 641
 642 static gboolean
 643 _launch_screen_reader_repeat_until_success(gpointer user_data) {
 644     A11yBusLauncher *bl = user_data;
 645
 646     if (bl->launch_screen_reader_repeats > 100 || bl->pid > 0)
 647       {
 648          //do not try anymore
 649          return FALSE;
 650       }
 651
 652     gboolean ret = _launch_screen_reader(user_data);
 653
 654     if (ret)
 655       {
 656          //we managed to
 657          bl->launch_screen_reader_repeats = 0;
 658          return FALSE;
 659       }
 660     //try again
 661     return TRUE;
 662 }
 663
 664 static gboolean
 665 _terminate_screen_reader(A11yBusLauncher *bl)
 666 {
 667    LOGD("Terminating screen reader");
 668    int ret;
 669    int ret_aul;
 670    if (bl->pid <= 0)
 671      return FALSE;
 672
 673
 674    int status = aul_app_get_status_bypid(bl->pid);
 675
 676    if (status < 0)
 677      {
 678        LOGD("App with pid %d already terminated", bl->pid);
 679        bl->pid = 0;
 680        return TRUE;
 681      }
 682
 683    LOGD("terminate process with pid %d", bl->pid);
 684    ret_aul = aul_terminate_pid(bl->pid);
 685    if (ret_aul >= 0)
 686      {
 687         LOGD("Terminating with aul_terminate_pid: return is %d", ret_aul);
 688         bl->pid = 0;
 689         return TRUE;
 690      }
 691    else
 692      LOGD("aul_terminate_pid failed: return is %d", ret_aul);
 693
 694    LOGD("Unable to terminate process using aul api. Sending SIGTERM signal");
 695    ret = kill(bl->pid, SIGTERM);
 696    if (!ret)
 697      {
 698         bl->pid = 0;
 699         return TRUE;
 700      }
 701
 702    LOGD("Unable to terminate process: %d with api or signal.", bl->pid);
 703    return FALSE;
 704 }
 705
 706 void screen_reader_cb(keynode_t *node, void *user_data)
 707 {
 708    A11yBusLauncher *bl = user_data;
 709    int ret;
 710
 711    ret = vconf_keynode_get_bool(node);
 712    LOGD("vconf_keynode_get_bool(node): %i", ret);
 713    if (ret < 0)
 714      return;
 715
 716    //check if process really exists (e.g didn't crash)
 717    if (bl->pid > 0)
 718      {
 719         int err = kill(bl->pid,0);
 720         //process doesn't exist
 721         if (err == ESRCH)
 722           bl->pid = 0;
 723      }
 724
 725    bl->screen_reader_needed = ret;
 726    LOGD("bl->screen_reader_needed: %i, bl->pid: %i", ret, bl->pid);
 727    if (!bl->screen_reader_needed && (bl->pid > 0))
 728      _terminate_screen_reader(bl);
 729    else if (bl->screen_reader_needed && (bl->pid <= 0))
 730      _launch_screen_reader(bl);
 731 }
 732
 733 int
 734 main (int    argc,
 735       char **argv)
 736 {
 737 #ifdef ATSPI_BUS_LAUNCHER_LOG_TO_FILE
 738   log_file = fopen("/tmp/at-spi-bus-launcher.log", "a");
 739 #endif
 740
 741   LOGD("Starting atspi bus launcher");
 742   GError *error = NULL;
 743   GMainLoop *loop;
 744   GDBusConnection *session_bus;
 745   int name_owner_id;
 746   gboolean a11y_set = FALSE;
 747   gboolean screen_reader_set = FALSE;
 748   gint i;
 749
 750   if (already_running ())
 751     {
 752        LOGD("atspi bus launcher is already running");
 753        return 0;
 754     }
 755
 756   _global_app = g_slice_new0 (A11yBusLauncher);
 757   _global_app->loop = g_main_loop_new (NULL, FALSE);
 758   _global_app->launch_screen_reader_repeats = 0;
 759
 760   for (i = 1; i < argc; i++)
 761     {
 762       if (!strcmp (argv[i], "--launch-immediately"))
 763         _global_app->launch_immediately = TRUE;
 764       else if (sscanf (argv[i], "--a11y=%d", &_global_app->a11y_enabled) == 2)
 765         a11y_set = TRUE;
 766       else if (sscanf (argv[i], "--screen-reader=%d",
 767                        &_global_app->screen_reader_enabled) == 2)
 768         screen_reader_set = TRUE;
 769     else
 770       g_error ("usage: %s [--launch-immediately] [--a11y=0|1] [--screen-reader=0|1]", argv[0]);
 771     }
 772
 773   _global_app->interface_schema = get_schema ("org.gnome.desktop.interface");
 774   _global_app->a11y_schema = get_schema ("org.gnome.desktop.a11y.applications");
 775
 776   if (!a11y_set)
 777     {
 778       _global_app->a11y_enabled = _global_app->interface_schema
 779                                   ? g_settings_get_boolean (_global_app->interface_schema, "toolkit-accessibility")
 780                                   : _global_app->launch_immediately;
 781     }
 782
 783   if (!screen_reader_set)
 784     {
 785       _global_app->screen_reader_enabled = _global_app->a11y_schema
 786                                   ? g_settings_get_boolean (_global_app->a11y_schema, "screen-reader-enabled")
 787                                   : FALSE;
 788     }
 789
 790   if (_global_app->interface_schema)
 791     g_signal_connect (_global_app->interface_schema,
 792                       "changed::toolkit-accessibility",
 793                       G_CALLBACK (gsettings_key_changed), _global_app);
 794
 795   if (_global_app->a11y_schema)
 796     g_signal_connect (_global_app->a11y_schema,
 797                       "changed::screen-reader-enabled",
 798                       G_CALLBACK (gsettings_key_changed), _global_app);
 799
 800   init_sigterm_handling (_global_app);
 801
 802   introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
 803   g_assert (introspection_data != NULL);
 804
 805   name_owner_id = g_bus_own_name (G_BUS_TYPE_SESSION,
 806                                   "org.a11y.Bus",
 807                                   G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT,
 808                                   on_bus_acquired,
 809                                   on_name_acquired,
 810                                   on_name_lost,
 811                                   _global_app,
 812                                   NULL);
 813
 814   int ret = vconf_get_bool(VCONFKEY_SETAPPL_ACCESSIBILITY_TTS, &_global_app->screen_reader_needed);
 815   if (ret != 0)
 816     {
 817       LOGD("Could not read VCONFKEY_SETAPPL_ACCESSIBILITY_TTS key value.\n");
 818       return FALSE;
 819     }
 820   ret = vconf_notify_key_changed(VCONFKEY_SETAPPL_ACCESSIBILITY_TTS, screen_reader_cb, _global_app);
 821   if(ret != 0)
 822     {
 823       LOGD("Could not add information level callback\n");
 824       return FALSE;
 825     }
 826   if (_global_app->screen_reader_needed)
 827     g_timeout_add_seconds(2,_launch_screen_reader_repeat_until_success, _global_app);
 828
 829   g_main_loop_run (_global_app->loop);
 830
 831   if (_global_app->a11y_bus_pid > 0)
 832     kill (_global_app->a11y_bus_pid, SIGTERM);
 833
 834   /* Clear the X property if our bus is gone; in the case where e.g.
 835    * GDM is launching a login on an X server it was using before,
 836    * we don't want early login processes to pick up the stale address.
 837    */
 838 #ifdef HAVE_X11
 839   {
 840     Display *display = XOpenDisplay (NULL);
 841     if (display)
 842       {
 843         Atom bus_address_atom = XInternAtom (display, "AT_SPI_BUS", False);
 844         XDeleteProperty (display,
 845                          XDefaultRootWindow (display),
 846                          bus_address_atom);
 847
 848         XFlush (display);
 849         XCloseDisplay (display);
 850       }
 851   }
 852 #endif
 853
 854   if (_global_app->a11y_launch_error_message)
 855     {
 856       g_printerr ("Failed to launch bus: %s", _global_app->a11y_launch_error_message);
 857       return 1;
 858     }
 859   return 0;
 860 }