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 static gboolean _launch_screen_reader_repeat_until_success(gpointer user_data);
  68
  69 typedef enum {
  70   A11Y_BUS_STATE_IDLE = 0,
  71   A11Y_BUS_STATE_READING_ADDRESS,
  72   A11Y_BUS_STATE_RUNNING,
  73   A11Y_BUS_STATE_ERROR
  74 } A11yBusState;
  75
  76 typedef struct {
  77   GMainLoop *loop;
  78   gboolean launch_immediately;
  79   gboolean a11y_enabled;
  80   gboolean screen_reader_enabled;
  81   GDBusConnection *session_bus;
  82   GSettings *a11y_schema;
  83   GSettings *interface_schema;
  84
  85   int launch_screen_reader_repeats;
  86   gboolean screen_reader_needed;
  87   int pid;
  88
  89   A11yBusState state;
  90
  91   /* -1 == error, 0 == pending, > 0 == running */
  92   int a11y_bus_pid;
  93   char *a11y_bus_address;
  94   int pipefd[2];
  95   char *a11y_launch_error_message;
  96 } A11yBusLauncher;
  97
  98 static A11yBusLauncher *_global_app = NULL;
  99
 100 static const gchar introspection_xml[] =
 101   "<node>"
 102   "  <interface name='org.a11y.Bus'>"
 103   "    <method name='GetAddress'>"
 104   "      <arg type='s' name='address' direction='out'/>"
 105   "    </method>"
 106   "  </interface>"
 107   "<interface name='org.a11y.Status'>"
 108   "<property name='IsEnabled' type='b' access='readwrite'/>"
 109   "<property name='ScreenReaderEnabled' type='b' access='readwrite'/>"
 110   "</interface>"
 111   "</node>";
 112 static GDBusNodeInfo *introspection_data = NULL;
 113
 114 static void
 115 setup_bus_child (gpointer data)
 116 {
 117   A11yBusLauncher *app = data;
 118   (void) app;
 119
 120   close (app->pipefd[0]);
 121   dup2 (app->pipefd[1], 3);
 122   close (app->pipefd[1]);
 123
 124   /* On Linux, tell the bus process to exit if this process goes away */
 125 #ifdef __linux
 126 #include <sys/prctl.h>
 127   prctl (PR_SET_PDEATHSIG, 15);
 128 #endif
 129 }
 130
 131 /**
 132  * unix_read_all_fd_to_string:
 133  *
 134  * Read all data from a file descriptor to a C string buffer.
 135  */
 136 static gboolean
 137 unix_read_all_fd_to_string (int      fd,
 138                             char    *buf,
 139                             ssize_t  max_bytes)
 140 {
 141   ssize_t bytes_read;
 142
 143   while (max_bytes > 1 && (bytes_read = read (fd, buf, MAX (4096, max_bytes - 1))))
 144     {
 145       if (bytes_read < 0)
 146         return FALSE;
 147       buf += bytes_read;
 148       max_bytes -= bytes_read;
 149     }
 150   *buf = '\0';
 151   return TRUE;
 152 }
 153
 154 static void
 155 on_bus_exited (GPid     pid,
 156                gint     status,
 157                gpointer data)
 158 {
 159   A11yBusLauncher *app = data;
 160
 161   app->a11y_bus_pid = -1;
 162   app->state = A11Y_BUS_STATE_ERROR;
 163   if (app->a11y_launch_error_message == NULL)
 164     {
 165       if (WIFEXITED (status))
 166         app->a11y_launch_error_message = g_strdup_printf ("Bus exited with code %d", WEXITSTATUS (status));
 167       else if (WIFSIGNALED (status))
 168         app->a11y_launch_error_message = g_strdup_printf ("Bus killed by signal %d", WTERMSIG (status));
 169       else if (WIFSTOPPED (status))
 170         app->a11y_launch_error_message = g_strdup_printf ("Bus stopped by signal %d", WSTOPSIG (status));
 171     }
 172   g_main_loop_quit (app->loop);
 173 }
 174
 175 static gboolean
 176 ensure_a11y_bus (A11yBusLauncher *app)
 177 {
 178   GPid pid;
 179   char *argv[] = { DBUS_DAEMON, NULL, "--nofork", "--print-address", "3", NULL };
 180   char addr_buf[2048];
 181   GError *error = NULL;
 182
 183   if (app->a11y_bus_pid != 0)
 184     return FALSE;
 185
 186   argv[1] = g_strdup_printf ("--config-file=%s/at-spi2/accessibility.conf", SYSCONFDIR);
 187
 188   if (pipe (app->pipefd) < 0)
 189     g_error ("Failed to create pipe: %s", strerror (errno));
 190
 191   if (!g_spawn_async (NULL,
 192                       argv,
 193                       NULL,
 194                       G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
 195                       setup_bus_child,
 196                       app,
 197                       &pid,
 198                       &error))
 199     {
 200       app->a11y_bus_pid = -1;
 201       app->a11y_launch_error_message = g_strdup (error->message);
 202       g_clear_error (&error);
 203       goto error;
 204     }
 205
 206   close (app->pipefd[1]);
 207   app->pipefd[1] = -1;
 208
 209   g_child_watch_add (pid, on_bus_exited, app);
 210
 211   app->state = A11Y_BUS_STATE_READING_ADDRESS;
 212   app->a11y_bus_pid = pid;
 213   LOGD("Launched a11y bus, child is %ld", (long) pid);
 214   if (!unix_read_all_fd_to_string (app->pipefd[0], addr_buf, sizeof (addr_buf)))
 215     {
 216       app->a11y_launch_error_message = g_strdup_printf ("Failed to read address: %s", strerror (errno));
 217       kill (app->a11y_bus_pid, SIGTERM);
 218       goto error;
 219     }
 220   close (app->pipefd[0]);
 221   app->pipefd[0] = -1;
 222   app->state = A11Y_BUS_STATE_RUNNING;
 223
 224   /* Trim the trailing newline */
 225   app->a11y_bus_address = g_strchomp (g_strdup (addr_buf));
 226   LOGD("a11y bus address: %s", app->a11y_bus_address);
 227
 228 #ifdef HAVE_X11
 229   {
 230     Display *display = XOpenDisplay (NULL);
 231     if (display)
 232       {
 233         Atom bus_address_atom = XInternAtom (display, "AT_SPI_BUS", False);
 234         XChangeProperty (display,
 235                          XDefaultRootWindow (display),
 236                          bus_address_atom,
 237                          XA_STRING, 8, PropModeReplace,
 238                          (guchar *) app->a11y_bus_address, strlen (app->a11y_bus_address));
 239         XFlush (display);
 240         XCloseDisplay (display);
 241       }
 242   }
 243 #endif
 244
 245   if (argv[1]) g_free(argv[1]);
 246
 247   return TRUE;
 248
 249  error:
 250   if (argv[1]) g_free(argv[1]);
 251   close (app->pipefd[0]);
 252   close (app->pipefd[1]);
 253   app->state = A11Y_BUS_STATE_ERROR;
 254
 255   return FALSE;
 256 }
 257
 258 static void
 259 handle_method_call (GDBusConnection       *connection,
 260                     const gchar           *sender,
 261                     const gchar           *object_path,
 262                     const gchar           *interface_name,
 263                     const gchar           *method_name,
 264                     GVariant              *parameters,
 265                     GDBusMethodInvocation *invocation,
 266                     gpointer               user_data)
 267 {
 268   A11yBusLauncher *app = user_data;
 269
 270   if (g_strcmp0 (method_name, "GetAddress") == 0)
 271     {
 272       ensure_a11y_bus (app);
 273       if (app->a11y_bus_pid > 0)
 274         g_dbus_method_invocation_return_value (invocation,
 275                                                g_variant_new ("(s)", app->a11y_bus_address));
 276       else
 277         g_dbus_method_invocation_return_dbus_error (invocation,
 278                                                     "org.a11y.Bus.Error",
 279                                                     app->a11y_launch_error_message);
 280     }
 281 }
 282
 283 static GVariant *
 284 handle_get_property  (GDBusConnection       *connection,
 285                       const gchar           *sender,
 286                       const gchar           *object_path,
 287                       const gchar           *interface_name,
 288                       const gchar           *property_name,
 289                     GError **error,
 290                     gpointer               user_data)
 291 {
 292   A11yBusLauncher *app = user_data;
 293
 294   if (g_strcmp0 (property_name, "IsEnabled") == 0)
 295     return g_variant_new ("b", app->a11y_enabled);
 296   else if (g_strcmp0 (property_name, "ScreenReaderEnabled") == 0)
 297     return g_variant_new ("b", app->screen_reader_enabled);
 298   else
 299     return NULL;
 300 }
 301
 302 static void
 303 handle_a11y_enabled_change (A11yBusLauncher *app, gboolean enabled,
 304                                gboolean notify_gsettings)
 305 {
 306   GVariantBuilder builder;
 307   GVariantBuilder invalidated_builder;
 308
 309   if (enabled == app->a11y_enabled)
 310     return;
 311
 312   app->a11y_enabled = enabled;
 313
 314   if (notify_gsettings && app->interface_schema)
 315     {
 316       g_settings_set_boolean (app->interface_schema, "toolkit-accessibility",
 317                               enabled);
 318       g_settings_sync ();
 319     }
 320
 321   g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
 322   g_variant_builder_init (&invalidated_builder, G_VARIANT_TYPE ("as"));
 323   g_variant_builder_add (&builder, "{sv}", "IsEnabled",
 324                          g_variant_new_boolean (enabled));
 325
 326   g_dbus_connection_emit_signal (app->session_bus, NULL, "/org/a11y/bus",
 327                                  "org.freedesktop.DBus.Properties",
 328                                  "PropertiesChanged",
 329                                  g_variant_new ("(sa{sv}as)", "org.a11y.Status",
 330                                                 &builder,
 331                                                 &invalidated_builder),
 332                                  NULL);
 333   g_variant_builder_clear (&builder);
 334   g_variant_builder_clear (&invalidated_builder);
 335 }
 336
 337 static void
 338 handle_screen_reader_enabled_change (A11yBusLauncher *app, gboolean enabled,
 339                                gboolean notify_gsettings)
 340 {
 341   GVariantBuilder builder;
 342   GVariantBuilder invalidated_builder;
 343
 344   if (enabled == app->screen_reader_enabled)
 345     return;
 346
 347   /* If the screen reader is being enabled, we should enable accessibility
 348    * if it isn't enabled already */
 349   if (enabled)
 350     handle_a11y_enabled_change (app, enabled, notify_gsettings);
 351
 352   app->screen_reader_enabled = enabled;
 353
 354   if (notify_gsettings && app->a11y_schema)
 355     {
 356       g_settings_set_boolean (app->a11y_schema, "screen-reader-enabled",
 357                               enabled);
 358       g_settings_sync ();
 359     }
 360
 361   g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
 362   g_variant_builder_init (&invalidated_builder, G_VARIANT_TYPE ("as"));
 363   g_variant_builder_add (&builder, "{sv}", "ScreenReaderEnabled",
 364                          g_variant_new_boolean (enabled));
 365
 366   g_dbus_connection_emit_signal (app->session_bus, NULL, "/org/a11y/bus",
 367                                  "org.freedesktop.DBus.Properties",
 368                                  "PropertiesChanged",
 369                                  g_variant_new ("(sa{sv}as)", "org.a11y.Status",
 370                                                 &builder,
 371                                                 &invalidated_builder),
 372                                  NULL);
 373   g_variant_builder_clear (&builder);
 374   g_variant_builder_clear (&invalidated_builder);
 375 }
 376
 377 static gboolean
 378 handle_set_property  (GDBusConnection       *connection,
 379                       const gchar           *sender,
 380                       const gchar           *object_path,
 381                       const gchar           *interface_name,
 382                       const gchar           *property_name,
 383                       GVariant *value,
 384                     GError **error,
 385                     gpointer               user_data)
 386 {
 387   A11yBusLauncher *app = user_data;
 388   const gchar *type = g_variant_get_type_string (value);
 389   gboolean enabled;
 390
 391   if (g_strcmp0 (type, "b") != 0)
 392     {
 393       g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
 394                        "org.a11y.Status.%s expects a boolean but got %s", property_name, type);
 395       return FALSE;
 396     }
 397
 398   enabled = g_variant_get_boolean (value);
 399
 400   if (g_strcmp0 (property_name, "IsEnabled") == 0)
 401     {
 402       handle_a11y_enabled_change (app, enabled, TRUE);
 403       return TRUE;
 404     }
 405   else if (g_strcmp0 (property_name, "ScreenReaderEnabled") == 0)
 406     {
 407       handle_screen_reader_enabled_change (app, enabled, TRUE);
 408       return TRUE;
 409     }
 410   else
 411     {
 412       g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
 413                        "Unknown property '%s'", property_name);
 414       return FALSE;
 415     }
 416 }
 417
 418 static const GDBusInterfaceVTable bus_vtable =
 419 {
 420   handle_method_call,
 421   NULL, /* handle_get_property, */
 422   NULL  /* handle_set_property */
 423 };
 424
 425 static const GDBusInterfaceVTable status_vtable =
 426 {
 427   NULL, /* handle_method_call */
 428   handle_get_property,
 429   handle_set_property
 430 };
 431
 432 static void
 433 on_bus_acquired (GDBusConnection *connection,
 434                  const gchar     *name,
 435                  gpointer         user_data)
 436 {
 437   A11yBusLauncher *app = user_data;
 438   GError *error;
 439   guint registration_id;
 440
 441   if (connection == NULL)
 442     {
 443       g_main_loop_quit (app->loop);
 444       return;
 445     }
 446   app->session_bus = connection;
 447
 448   if (app->launch_immediately)
 449     {
 450       ensure_a11y_bus (app);
 451       if (app->state == A11Y_BUS_STATE_ERROR)
 452         {
 453           g_main_loop_quit (app->loop);
 454           return;
 455         }
 456     }
 457
 458   error = NULL;
 459   registration_id = g_dbus_connection_register_object (connection,
 460                                                        "/org/a11y/bus",
 461                                                        introspection_data->interfaces[0],
 462                                                        &bus_vtable,
 463                                                        _global_app,
 464                                                        NULL,
 465                                                        &error);
 466   if (registration_id == 0)
 467     {
 468       g_error ("%s", error->message);
 469       g_clear_error (&error);
 470     }
 471
 472   g_dbus_connection_register_object (connection,
 473                                      "/org/a11y/bus",
 474                                      introspection_data->interfaces[1],
 475                                      &status_vtable,
 476                                      _global_app,
 477                                      NULL,
 478                                      NULL);
 479 }
 480
 481 static void
 482 on_name_lost (GDBusConnection *connection,
 483               const gchar     *name,
 484               gpointer         user_data)
 485 {
 486   A11yBusLauncher *app = user_data;
 487   if (app->session_bus == NULL
 488       && connection == NULL
 489       && app->a11y_launch_error_message == NULL)
 490     app->a11y_launch_error_message = g_strdup ("Failed to connect to session bus");
 491   g_main_loop_quit (app->loop);
 492 }
 493
 494 static void
 495 on_name_acquired (GDBusConnection *connection,
 496                   const gchar     *name,
 497                   gpointer         user_data)
 498 {
 499   A11yBusLauncher *app = user_data;
 500   (void) app;
 501 }
 502
 503 static int sigterm_pipefd[2];
 504
 505 static void
 506 sigterm_handler (int signum)
 507 {
 508   write (sigterm_pipefd[1], "X", 1);
 509 }
 510
 511 static gboolean
 512 on_sigterm_pipe (GIOChannel  *channel,
 513                  GIOCondition condition,
 514                  gpointer     data)
 515 {
 516   A11yBusLauncher *app = data;
 517
 518   g_main_loop_quit (app->loop);
 519
 520   return FALSE;
 521 }
 522
 523 static void
 524 init_sigterm_handling (A11yBusLauncher *app)
 525 {
 526   GIOChannel *sigterm_channel;
 527
 528   if (pipe (sigterm_pipefd) < 0)
 529     g_error ("Failed to create pipe: %s", strerror (errno));
 530   signal (SIGTERM, sigterm_handler);
 531
 532   sigterm_channel = g_io_channel_unix_new (sigterm_pipefd[0]);
 533   g_io_add_watch (sigterm_channel,
 534                   G_IO_IN | G_IO_ERR | G_IO_HUP,
 535                   on_sigterm_pipe,
 536                   app);
 537 }
 538
 539 static gboolean
 540 already_running ()
 541 {
 542 #ifdef HAVE_X11
 543   Atom AT_SPI_BUS;
 544   Atom actual_type;
 545   Display *bridge_display;
 546   int actual_format;
 547   unsigned char *data = NULL;
 548   unsigned long nitems;
 549   unsigned long leftover;
 550   gboolean result = FALSE;
 551
 552   bridge_display = XOpenDisplay (NULL);
 553   if (!bridge_display)
 554               return FALSE;
 555
 556   AT_SPI_BUS = XInternAtom (bridge_display, "AT_SPI_BUS", False);
 557   XGetWindowProperty (bridge_display,
 558                       XDefaultRootWindow (bridge_display),
 559                       AT_SPI_BUS, 0L,
 560                       (long) BUFSIZ, False,
 561                       (Atom) 31, &actual_type, &actual_format,
 562                       &nitems, &leftover, &data);
 563
 564   if (data)
 565   {
 566     GDBusConnection *bus;
 567     bus = g_dbus_connection_new_for_address_sync ((const gchar *)data, 0,
 568                                                   NULL, NULL, NULL);
 569     if (bus != NULL)
 570       {
 571         result = TRUE;
 572         g_object_unref (bus);
 573       }
 574   }
 575
 576   XCloseDisplay (bridge_display);
 577   return result;
 578 #else
 579   return FALSE;
 580 #endif
 581 }
 582
 583 static GSettings *
 584 get_schema (const gchar *name)
 585 {
 586   const char * const *schemas = NULL;
 587   gint i;
 588
 589   schemas = g_settings_list_schemas ();
 590   for (i = 0; schemas[i]; i++)
 591   {
 592     if (!strcmp (schemas[i], name))
 593       return g_settings_new (schemas[i]);
 594   }
 595
 596   return NULL;
 597 }
 598
 599 static void
 600 gsettings_key_changed (GSettings *gsettings, const gchar *key, void *user_data)
 601 {
 602   gboolean new_val = g_settings_get_boolean (gsettings, key);
 603   A11yBusLauncher *app = user_data;
 604
 605   if (!strcmp (key, "toolkit-accessibility"))
 606     handle_a11y_enabled_change (_global_app, new_val, FALSE);
 607   else if (!strcmp (key, "screen-reader-enabled"))
 608     handle_screen_reader_enabled_change (_global_app, new_val, FALSE);
 609 }
 610
 611 static int
 612 _screen_reader_dead_tracker (int pid, void *data)
 613 {
 614   A11yBusLauncher *app = data;
 615
 616   if (app->pid > 0 && pid == app->pid)
 617     {
 618       LOGE("screen reader is dead, pid: %d, restarting", pid);
 619       app->pid = 0;
 620       g_timeout_add_seconds (2, _launch_screen_reader_repeat_until_success, app);
 621     }
 622   return 0;
 623 }
 624
 625 static gboolean
 626 _launch_screen_reader(gpointer user_data, gboolean by_vconf_change)
 627 {
 628    A11yBusLauncher *bl = user_data;
 629    LOGD("Launching screen reader");
 630
 631    bundle *kb = NULL;
 632    gboolean ret = FALSE;
 633
 634    kb = bundle_create();
 635
 636    if (kb == NULL)
 637      {
 638         LOGD("Can't create bundle");
 639         return FALSE;
 640      }
 641
 642    if (by_vconf_change)
 643      {
 644         if (bundle_add_str(kb, "by_vconf_change", "yes") != BUNDLE_ERROR_NONE)
 645           {
 646              LOGD("Can't add information to bundle");
 647           }
 648      }
 649
 650    int operation_error = appsvc_set_operation(kb, APP_CONTROL_OPERATION_SCREEN_READ);
 651    LOGD("appsvc_set_operation: %i", operation_error);
 652
 653    bl->pid = appsvc_run_service(kb, 0, NULL, NULL);
 654
 655    if (bl->pid > 0)
 656      {
 657         LOGD("Screen reader launched with pid: %i", bl->pid);
 658         LOGD("registering screen reader dead tracker");
 659         aul_listen_app_dead_signal(_screen_reader_dead_tracker, bl);
 660         ret = TRUE;
 661      }
 662    else
 663      {
 664         LOGD("Can't start screen-reader - error code: %i", bl->pid);
 665      }
 666
 667
 668    bundle_free(kb);
 669    return ret;
 670 }
 671
 672 static gboolean
 673 _launch_screen_reader_repeat_until_success(gpointer user_data) {
 674     A11yBusLauncher *bl = user_data;
 675
 676     if (bl->launch_screen_reader_repeats > 100 || bl->pid > 0)
 677       {
 678          //do not try anymore
 679          return FALSE;
 680       }
 681
 682     gboolean ret = _launch_screen_reader(user_data, FALSE);
 683
 684     if (ret)
 685       {
 686          //we managed to
 687          bl->launch_screen_reader_repeats = 0;
 688          return FALSE;
 689       }
 690     //try again
 691     return TRUE;
 692 }
 693
 694 static gboolean
 695 _terminate_screen_reader(A11yBusLauncher *bl)
 696 {
 697    LOGD("Terminating screen reader");
 698    int ret;
 699    int ret_aul;
 700    if (bl->pid <= 0)
 701      return FALSE;
 702
 703
 704    LOGD("unregistering screen reader dead tracker");
 705    aul_listen_app_dead_signal(NULL, NULL);
 706
 707    int status = aul_app_get_status_bypid(bl->pid);
 708
 709    if (status < 0)
 710      {
 711        LOGD("App with pid %d already terminated", bl->pid);
 712        bl->pid = 0;
 713        return TRUE;
 714      }
 715
 716    LOGD("terminate process with pid %d", bl->pid);
 717    ret_aul = aul_terminate_pid(bl->pid);
 718    if (ret_aul >= 0)
 719      {
 720         LOGD("Terminating with aul_terminate_pid: return is %d", ret_aul);
 721         bl->pid = 0;
 722         return TRUE;
 723      }
 724    else
 725      LOGD("aul_terminate_pid failed: return is %d", ret_aul);
 726
 727    LOGD("Unable to terminate process using aul api. Sending SIGTERM signal");
 728    ret = kill(bl->pid, SIGTERM);
 729    if (!ret)
 730      {
 731         bl->pid = 0;
 732         return TRUE;
 733      }
 734
 735    LOGD("Unable to terminate process: %d with api or signal.", bl->pid);
 736    return FALSE;
 737 }
 738
 739 void screen_reader_cb(keynode_t *node, void *user_data)
 740 {
 741    A11yBusLauncher *bl = user_data;
 742    int ret;
 743
 744    ret = vconf_keynode_get_bool(node);
 745    LOGD("vconf_keynode_get_bool(node): %i", ret);
 746    if (ret < 0)
 747      return;
 748
 749    //check if process really exists (e.g didn't crash)
 750    if (bl->pid > 0)
 751      {
 752         int err = kill(bl->pid,0);
 753         //process doesn't exist
 754         if (err == ESRCH)
 755           bl->pid = 0;
 756      }
 757
 758    bl->screen_reader_needed = ret;
 759    LOGD("bl->screen_reader_needed: %i, bl->pid: %i", ret, bl->pid);
 760    if (!bl->screen_reader_needed && (bl->pid > 0))
 761      _terminate_screen_reader(bl);
 762    else if (bl->screen_reader_needed && (bl->pid <= 0))
 763      _launch_screen_reader(bl, TRUE);
 764 }
 765
 766 int
 767 main (int    argc,
 768       char **argv)
 769 {
 770 #ifdef ATSPI_BUS_LAUNCHER_LOG_TO_FILE
 771   log_file = fopen("/tmp/at-spi-bus-launcher.log", "a");
 772 #endif
 773
 774   LOGD("Starting atspi bus launcher");
 775   GError *error = NULL;
 776   GMainLoop *loop;
 777   GDBusConnection *session_bus;
 778   int name_owner_id;
 779   gboolean a11y_set = FALSE;
 780   gboolean screen_reader_set = FALSE;
 781   gint i;
 782
 783   if (already_running ())
 784     {
 785        LOGD("atspi bus launcher is already running");
 786        return 0;
 787     }
 788
 789   _global_app = g_slice_new0 (A11yBusLauncher);
 790   _global_app->loop = g_main_loop_new (NULL, FALSE);
 791   _global_app->launch_screen_reader_repeats = 0;
 792
 793   for (i = 1; i < argc; i++)
 794     {
 795       if (!strcmp (argv[i], "--launch-immediately"))
 796         _global_app->launch_immediately = TRUE;
 797       else if (sscanf (argv[i], "--a11y=%d", &_global_app->a11y_enabled) == 2)
 798         a11y_set = TRUE;
 799       else if (sscanf (argv[i], "--screen-reader=%d",
 800                        &_global_app->screen_reader_enabled) == 2)
 801         screen_reader_set = TRUE;
 802     else
 803       g_error ("usage: %s [--launch-immediately] [--a11y=0|1] [--screen-reader=0|1]", argv[0]);
 804     }
 805
 806   _global_app->interface_schema = get_schema ("org.gnome.desktop.interface");
 807   _global_app->a11y_schema = get_schema ("org.gnome.desktop.a11y.applications");
 808
 809   if (!a11y_set)
 810     {
 811       _global_app->a11y_enabled = _global_app->interface_schema
 812                                   ? g_settings_get_boolean (_global_app->interface_schema, "toolkit-accessibility")
 813                                   : _global_app->launch_immediately;
 814     }
 815
 816   if (!screen_reader_set)
 817     {
 818       _global_app->screen_reader_enabled = _global_app->a11y_schema
 819                                   ? g_settings_get_boolean (_global_app->a11y_schema, "screen-reader-enabled")
 820                                   : FALSE;
 821     }
 822
 823   if (_global_app->interface_schema)
 824     g_signal_connect (_global_app->interface_schema,
 825                       "changed::toolkit-accessibility",
 826                       G_CALLBACK (gsettings_key_changed), _global_app);
 827
 828   if (_global_app->a11y_schema)
 829     g_signal_connect (_global_app->a11y_schema,
 830                       "changed::screen-reader-enabled",
 831                       G_CALLBACK (gsettings_key_changed), _global_app);
 832
 833   init_sigterm_handling (_global_app);
 834
 835   introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
 836   g_assert (introspection_data != NULL);
 837
 838   name_owner_id = g_bus_own_name (G_BUS_TYPE_SESSION,
 839                                   "org.a11y.Bus",
 840                                   G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT,
 841                                   on_bus_acquired,
 842                                   on_name_acquired,
 843                                   on_name_lost,
 844                                   _global_app,
 845                                   NULL);
 846
 847   int ret = vconf_get_bool(VCONFKEY_SETAPPL_ACCESSIBILITY_TTS, &_global_app->screen_reader_needed);
 848   if (ret != 0)
 849     {
 850       LOGD("Could not read VCONFKEY_SETAPPL_ACCESSIBILITY_TTS key value.\n");
 851       return FALSE;
 852     }
 853   ret = vconf_notify_key_changed(VCONFKEY_SETAPPL_ACCESSIBILITY_TTS, screen_reader_cb, _global_app);
 854   if(ret != 0)
 855     {
 856       LOGD("Could not add information level callback\n");
 857       return FALSE;
 858     }
 859   if (_global_app->screen_reader_needed)
 860     g_timeout_add_seconds(2,_launch_screen_reader_repeat_until_success, _global_app);
 861
 862   g_main_loop_run (_global_app->loop);
 863
 864   if (_global_app->a11y_bus_pid > 0)
 865     kill (_global_app->a11y_bus_pid, SIGTERM);
 866
 867   /* Clear the X property if our bus is gone; in the case where e.g.
 868    * GDM is launching a login on an X server it was using before,
 869    * we don't want early login processes to pick up the stale address.
 870    */
 871 #ifdef HAVE_X11
 872   {
 873     Display *display = XOpenDisplay (NULL);
 874     if (display)
 875       {
 876         Atom bus_address_atom = XInternAtom (display, "AT_SPI_BUS", False);
 877         XDeleteProperty (display,
 878                          XDefaultRootWindow (display),
 879                          bus_address_atom);
 880
 881         XFlush (display);
 882         XCloseDisplay (display);
 883       }
 884   }
 885 #endif
 886
 887   if (_global_app->a11y_launch_error_message)
 888     {
 889       g_printerr ("Failed to launch bus: %s", _global_app->a11y_launch_error_message);
 890       return 1;
 891     }
 892   return 0;
 893 }