1 /* -*- mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
3 * at-spi-bus-launcher: Manage the a11y bus as a child process
5 * Copyright 2011 Red Hat, Inc.
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.
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.
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.
35 #include <X11/Xatom.h>
38 #define APP_CONTROL_OPERATION_SCREEN_READ "http://tizen.org/appcontrol/operation/read_screen"
42 //uncomment if you want debug
43 //#ifndef TIZEN_ENGINEER_MODE
44 //#define TIZEN_ENGINEER_MODE
50 #define LOG_TAG "ATSPI_BUS_LAUNCHER"
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
59 #ifdef ATSPI_BUS_LAUNCHER_LOG_TO_FILE
64 #define LOGD(arg...) do {if (log_file) {fprintf(log_file, ##arg);fprintf(log_file, "\n"); fflush(log_file);}} while(0)
69 A11Y_BUS_STATE_IDLE = 0,
70 A11Y_BUS_STATE_READING_ADDRESS,
71 A11Y_BUS_STATE_RUNNING,
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;
84 int launch_screen_reader_repeats;
85 gboolean screen_reader_needed;
90 /* -1 == error, 0 == pending, > 0 == running */
92 char *a11y_bus_address;
94 char *a11y_launch_error_message;
97 static A11yBusLauncher *_global_app = NULL;
99 static const gchar introspection_xml[] =
101 " <interface name='org.a11y.Bus'>"
102 " <method name='GetAddress'>"
103 " <arg type='s' name='address' direction='out'/>"
106 "<interface name='org.a11y.Status'>"
107 "<property name='IsEnabled' type='b' access='readwrite'/>"
108 "<property name='ScreenReaderEnabled' type='b' access='readwrite'/>"
111 static GDBusNodeInfo *introspection_data = NULL;
114 setup_bus_child (gpointer data)
116 A11yBusLauncher *app = data;
119 close (app->pipefd[0]);
120 dup2 (app->pipefd[1], 3);
121 close (app->pipefd[1]);
123 /* On Linux, tell the bus process to exit if this process goes away */
125 #include <sys/prctl.h>
126 prctl (PR_SET_PDEATHSIG, 15);
131 * unix_read_all_fd_to_string:
133 * Read all data from a file descriptor to a C string buffer.
136 unix_read_all_fd_to_string (int fd,
142 while (max_bytes > 1 && (bytes_read = read (fd, buf, MAX (4096, max_bytes - 1))))
147 max_bytes -= bytes_read;
154 on_bus_exited (GPid pid,
158 A11yBusLauncher *app = data;
160 app->a11y_bus_pid = -1;
161 app->state = A11Y_BUS_STATE_ERROR;
162 if (app->a11y_launch_error_message == NULL)
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));
171 g_main_loop_quit (app->loop);
175 ensure_a11y_bus (A11yBusLauncher *app)
178 char *argv[] = { DBUS_DAEMON, NULL, "--nofork", "--print-address", "3", NULL };
180 GError *error = NULL;
182 if (app->a11y_bus_pid != 0)
185 argv[1] = g_strdup_printf ("--config-file=%s/at-spi2/accessibility.conf", SYSCONFDIR);
187 if (pipe (app->pipefd) < 0)
188 g_error ("Failed to create pipe: %s", strerror (errno));
190 if (!g_spawn_async (NULL,
193 G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
199 app->a11y_bus_pid = -1;
200 app->a11y_launch_error_message = g_strdup (error->message);
201 g_clear_error (&error);
205 close (app->pipefd[1]);
208 g_child_watch_add (pid, on_bus_exited, app);
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)))
215 app->a11y_launch_error_message = g_strdup_printf ("Failed to read address: %s", strerror (errno));
216 kill (app->a11y_bus_pid, SIGTERM);
219 close (app->pipefd[0]);
221 app->state = A11Y_BUS_STATE_RUNNING;
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);
229 Display *display = XOpenDisplay (NULL);
232 Atom bus_address_atom = XInternAtom (display, "AT_SPI_BUS", False);
233 XChangeProperty (display,
234 XDefaultRootWindow (display),
236 XA_STRING, 8, PropModeReplace,
237 (guchar *) app->a11y_bus_address, strlen (app->a11y_bus_address));
239 XCloseDisplay (display);
247 close (app->pipefd[0]);
248 close (app->pipefd[1]);
249 app->state = A11Y_BUS_STATE_ERROR;
255 handle_method_call (GDBusConnection *connection,
257 const gchar *object_path,
258 const gchar *interface_name,
259 const gchar *method_name,
260 GVariant *parameters,
261 GDBusMethodInvocation *invocation,
264 A11yBusLauncher *app = user_data;
266 if (g_strcmp0 (method_name, "GetAddress") == 0)
268 ensure_a11y_bus (app);
269 if (app->a11y_bus_pid > 0)
270 g_dbus_method_invocation_return_value (invocation,
271 g_variant_new ("(s)", app->a11y_bus_address));
273 g_dbus_method_invocation_return_dbus_error (invocation,
274 "org.a11y.Bus.Error",
275 app->a11y_launch_error_message);
280 handle_get_property (GDBusConnection *connection,
282 const gchar *object_path,
283 const gchar *interface_name,
284 const gchar *property_name,
288 A11yBusLauncher *app = user_data;
290 if (g_strcmp0 (property_name, "IsEnabled") == 0)
291 return g_variant_new ("b", app->a11y_enabled);
292 else if (g_strcmp0 (property_name, "ScreenReaderEnabled") == 0)
293 return g_variant_new ("b", app->screen_reader_enabled);
299 handle_a11y_enabled_change (A11yBusLauncher *app, gboolean enabled,
300 gboolean notify_gsettings)
302 GVariantBuilder builder;
303 GVariantBuilder invalidated_builder;
305 if (enabled == app->a11y_enabled)
308 app->a11y_enabled = enabled;
310 if (notify_gsettings && app->interface_schema)
312 g_settings_set_boolean (app->interface_schema, "toolkit-accessibility",
317 g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
318 g_variant_builder_init (&invalidated_builder, G_VARIANT_TYPE ("as"));
319 g_variant_builder_add (&builder, "{sv}", "IsEnabled",
320 g_variant_new_boolean (enabled));
322 g_dbus_connection_emit_signal (app->session_bus, NULL, "/org/a11y/bus",
323 "org.freedesktop.DBus.Properties",
325 g_variant_new ("(sa{sv}as)", "org.a11y.Status",
327 &invalidated_builder),
332 handle_screen_reader_enabled_change (A11yBusLauncher *app, gboolean enabled,
333 gboolean notify_gsettings)
335 GVariantBuilder builder;
336 GVariantBuilder invalidated_builder;
338 if (enabled == app->screen_reader_enabled)
341 /* If the screen reader is being enabled, we should enable accessibility
342 * if it isn't enabled already */
344 handle_a11y_enabled_change (app, enabled, notify_gsettings);
346 app->screen_reader_enabled = enabled;
348 if (notify_gsettings && app->a11y_schema)
350 g_settings_set_boolean (app->a11y_schema, "screen-reader-enabled",
355 g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
356 g_variant_builder_init (&invalidated_builder, G_VARIANT_TYPE ("as"));
357 g_variant_builder_add (&builder, "{sv}", "ScreenReaderEnabled",
358 g_variant_new_boolean (enabled));
360 g_dbus_connection_emit_signal (app->session_bus, NULL, "/org/a11y/bus",
361 "org.freedesktop.DBus.Properties",
363 g_variant_new ("(sa{sv}as)", "org.a11y.Status",
365 &invalidated_builder),
370 handle_set_property (GDBusConnection *connection,
372 const gchar *object_path,
373 const gchar *interface_name,
374 const gchar *property_name,
379 A11yBusLauncher *app = user_data;
380 const gchar *type = g_variant_get_type_string (value);
383 if (g_strcmp0 (type, "b") != 0)
385 g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
386 "org.a11y.Status.%s expects a boolean but got %s", property_name, type);
390 enabled = g_variant_get_boolean (value);
392 if (g_strcmp0 (property_name, "IsEnabled") == 0)
394 handle_a11y_enabled_change (app, enabled, TRUE);
397 else if (g_strcmp0 (property_name, "ScreenReaderEnabled") == 0)
399 handle_screen_reader_enabled_change (app, enabled, TRUE);
404 g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
405 "Unknown property '%s'", property_name);
410 static const GDBusInterfaceVTable bus_vtable =
413 NULL, /* handle_get_property, */
414 NULL /* handle_set_property */
417 static const GDBusInterfaceVTable status_vtable =
419 NULL, /* handle_method_call */
425 on_bus_acquired (GDBusConnection *connection,
429 A11yBusLauncher *app = user_data;
431 guint registration_id;
433 if (connection == NULL)
435 g_main_loop_quit (app->loop);
438 app->session_bus = connection;
440 if (app->launch_immediately)
442 ensure_a11y_bus (app);
443 if (app->state == A11Y_BUS_STATE_ERROR)
445 g_main_loop_quit (app->loop);
451 registration_id = g_dbus_connection_register_object (connection,
453 introspection_data->interfaces[0],
458 if (registration_id == 0)
460 g_error ("%s", error->message);
461 g_clear_error (&error);
464 g_dbus_connection_register_object (connection,
466 introspection_data->interfaces[1],
474 on_name_lost (GDBusConnection *connection,
478 A11yBusLauncher *app = user_data;
479 if (app->session_bus == NULL
480 && connection == NULL
481 && app->a11y_launch_error_message == NULL)
482 app->a11y_launch_error_message = g_strdup ("Failed to connect to session bus");
483 g_main_loop_quit (app->loop);
487 on_name_acquired (GDBusConnection *connection,
491 A11yBusLauncher *app = user_data;
495 static int sigterm_pipefd[2];
498 sigterm_handler (int signum)
500 write (sigterm_pipefd[1], "X", 1);
504 on_sigterm_pipe (GIOChannel *channel,
505 GIOCondition condition,
508 A11yBusLauncher *app = data;
510 g_main_loop_quit (app->loop);
516 init_sigterm_handling (A11yBusLauncher *app)
518 GIOChannel *sigterm_channel;
520 if (pipe (sigterm_pipefd) < 0)
521 g_error ("Failed to create pipe: %s", strerror (errno));
522 signal (SIGTERM, sigterm_handler);
524 sigterm_channel = g_io_channel_unix_new (sigterm_pipefd[0]);
525 g_io_add_watch (sigterm_channel,
526 G_IO_IN | G_IO_ERR | G_IO_HUP,
537 Display *bridge_display;
539 unsigned char *data = NULL;
540 unsigned long nitems;
541 unsigned long leftover;
542 gboolean result = FALSE;
544 bridge_display = XOpenDisplay (NULL);
548 AT_SPI_BUS = XInternAtom (bridge_display, "AT_SPI_BUS", False);
549 XGetWindowProperty (bridge_display,
550 XDefaultRootWindow (bridge_display),
552 (long) BUFSIZ, False,
553 (Atom) 31, &actual_type, &actual_format,
554 &nitems, &leftover, &data);
558 GDBusConnection *bus;
559 bus = g_dbus_connection_new_for_address_sync ((const gchar *)data, 0,
564 g_object_unref (bus);
568 XCloseDisplay (bridge_display);
576 get_schema (const gchar *name)
578 const char * const *schemas = NULL;
581 schemas = g_settings_list_schemas ();
582 for (i = 0; schemas[i]; i++)
584 if (!strcmp (schemas[i], name))
585 return g_settings_new (schemas[i]);
592 gsettings_key_changed (GSettings *gsettings, const gchar *key, void *user_data)
594 gboolean new_val = g_settings_get_boolean (gsettings, key);
595 A11yBusLauncher *app = user_data;
597 if (!strcmp (key, "toolkit-accessibility"))
598 handle_a11y_enabled_change (_global_app, new_val, FALSE);
599 else if (!strcmp (key, "screen-reader-enabled"))
600 handle_screen_reader_enabled_change (_global_app, new_val, FALSE);
604 _launch_screen_reader(gpointer user_data)
606 A11yBusLauncher *bl = user_data;
607 LOGD("Launching screen reader");
610 gboolean ret = FALSE;
612 kb = bundle_create();
616 LOGD("Can't create bundle");
619 int operation_error = appsvc_set_operation(kb, APP_CONTROL_OPERATION_SCREEN_READ);
620 LOGD("appsvc_set_operation: %i", operation_error);
622 bl->pid = appsvc_run_service(kb, 0, NULL, NULL);
626 LOGD("Screen reader launched with pid: %i", bl->pid);
631 LOGD("Can't start screen-reader - error code: %i", bl->pid);
640 _launch_screen_reader_repeat_until_success(gpointer user_data) {
641 A11yBusLauncher *bl = user_data;
643 if (bl->launch_screen_reader_repeats > 100 || bl->pid > 0)
649 gboolean ret = _launch_screen_reader(user_data);
654 bl->launch_screen_reader_repeats = 0;
662 _terminate_screen_reader(A11yBusLauncher *bl)
664 LOGD("Terminating screen reader");
671 int status = aul_app_get_status_bypid(bl->pid);
675 LOGD("App with pid %d already terminated", bl->pid);
680 LOGD("terminate process with pid %d", bl->pid);
681 ret_aul = aul_terminate_pid(bl->pid);
684 LOGD("Terminating with aul_terminate_pid: return is %d", ret_aul);
689 LOGD("aul_terminate_pid failed: return is %d", ret_aul);
691 LOGD("Unable to terminate process using aul api. Sending SIGTERM signal");
692 ret = kill(bl->pid, SIGTERM);
699 LOGD("Unable to terminate process: %d with api or signal.", bl->pid);
703 void screen_reader_cb(keynode_t *node, void *user_data)
705 A11yBusLauncher *bl = user_data;
708 ret = vconf_keynode_get_bool(node);
709 LOGD("vconf_keynode_get_bool(node): %i", ret);
713 //check if process really exists (e.g didn't crash)
716 int err = kill(bl->pid,0);
717 //process doesn't exist
722 bl->screen_reader_needed = ret;
723 LOGD("bl->screen_reader_needed: %i, bl->pid: %i", ret, bl->pid);
724 if (!bl->screen_reader_needed && (bl->pid > 0))
725 _terminate_screen_reader(bl);
726 else if (bl->screen_reader_needed && (bl->pid <= 0))
727 _launch_screen_reader(bl);
734 #ifdef ATSPI_BUS_LAUNCHER_LOG_TO_FILE
735 log_file = fopen("/tmp/at-spi-bus-launcher.log", "a");
738 LOGD("Starting atspi bus launcher");
739 GError *error = NULL;
741 GDBusConnection *session_bus;
743 gboolean a11y_set = FALSE;
744 gboolean screen_reader_set = FALSE;
747 if (already_running ())
749 LOGD("atspi bus launcher is already running");
753 _global_app = g_slice_new0 (A11yBusLauncher);
754 _global_app->loop = g_main_loop_new (NULL, FALSE);
755 _global_app->launch_screen_reader_repeats = 0;
757 for (i = 1; i < argc; i++)
759 if (!strcmp (argv[i], "--launch-immediately"))
760 _global_app->launch_immediately = TRUE;
761 else if (sscanf (argv[i], "--a11y=%d", &_global_app->a11y_enabled) == 2)
763 else if (sscanf (argv[i], "--screen-reader=%d",
764 &_global_app->screen_reader_enabled) == 2)
765 screen_reader_set = TRUE;
767 g_error ("usage: %s [--launch-immediately] [--a11y=0|1] [--screen-reader=0|1]", argv[0]);
770 _global_app->interface_schema = get_schema ("org.gnome.desktop.interface");
771 _global_app->a11y_schema = get_schema ("org.gnome.desktop.a11y.applications");
775 _global_app->a11y_enabled = _global_app->interface_schema
776 ? g_settings_get_boolean (_global_app->interface_schema, "toolkit-accessibility")
777 : _global_app->launch_immediately;
780 if (!screen_reader_set)
782 _global_app->screen_reader_enabled = _global_app->a11y_schema
783 ? g_settings_get_boolean (_global_app->a11y_schema, "screen-reader-enabled")
787 if (_global_app->interface_schema)
788 g_signal_connect (_global_app->interface_schema,
789 "changed::toolkit-accessibility",
790 G_CALLBACK (gsettings_key_changed), _global_app);
792 if (_global_app->a11y_schema)
793 g_signal_connect (_global_app->a11y_schema,
794 "changed::screen-reader-enabled",
795 G_CALLBACK (gsettings_key_changed), _global_app);
797 init_sigterm_handling (_global_app);
799 introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
800 g_assert (introspection_data != NULL);
802 name_owner_id = g_bus_own_name (G_BUS_TYPE_SESSION,
804 G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT,
811 int ret = vconf_get_bool(VCONFKEY_SETAPPL_ACCESSIBILITY_TTS, &_global_app->screen_reader_needed);
814 LOGD("Could not read VCONFKEY_SETAPPL_ACCESSIBILITY_TTS key value.\n");
817 ret = vconf_notify_key_changed(VCONFKEY_SETAPPL_ACCESSIBILITY_TTS, screen_reader_cb, _global_app);
820 LOGD("Could not add information level callback\n");
823 if (_global_app->screen_reader_needed)
824 g_timeout_add_seconds(2,_launch_screen_reader_repeat_until_success, _global_app);
826 g_main_loop_run (_global_app->loop);
828 if (_global_app->a11y_bus_pid > 0)
829 kill (_global_app->a11y_bus_pid, SIGTERM);
831 /* Clear the X property if our bus is gone; in the case where e.g.
832 * GDM is launching a login on an X server it was using before,
833 * we don't want early login processes to pick up the stale address.
837 Display *display = XOpenDisplay (NULL);
840 Atom bus_address_atom = XInternAtom (display, "AT_SPI_BUS", False);
841 XDeleteProperty (display,
842 XDefaultRootWindow (display),
846 XCloseDisplay (display);
851 if (_global_app->a11y_launch_error_message)
853 g_printerr ("Failed to launch bus: %s", _global_app->a11y_launch_error_message);