gio/gdbusnameowning.c

   1 /* GDBus - GLib D-Bus Library
   2  *
   3  * Copyright (C) 2008-2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: David Zeuthen <davidz@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26
  27 #include "gdbusutils.h"
  28 #include "gdbusnameowning.h"
  29 #include "gdbuserror.h"
  30 #include "gdbusprivate.h"
  31 #include "gdbusconnection.h"
  32
  33 #include "glibintl.h"
  34
  35 /**
  36  * SECTION:gdbusnameowning
  37  * @title: Owning Bus Names
  38  * @short_description: Simple API for owning bus names
  39  * @include: gio/gio.h
  40  *
  41  * Convenience API for owning bus names.
  42  *
  43  * <example id="gdbus-owning-names"><title>Simple application owning a name</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-own-name.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
  44  */
  45
  46 G_LOCK_DEFINE_STATIC (lock);
  47
  48 /* ---------------------------------------------------------------------------------------------------- */
  49
  50 typedef enum
  51 {
  52   PREVIOUS_CALL_NONE = 0,
  53   PREVIOUS_CALL_ACQUIRED,
  54   PREVIOUS_CALL_LOST,
  55 } PreviousCall;
  56
  57 typedef struct
  58 {
  59   volatile gint             ref_count;
  60   guint                     id;
  61   GBusNameOwnerFlags        flags;
  62   gchar                    *name;
  63   GBusAcquiredCallback      bus_acquired_handler;
  64   GBusNameAcquiredCallback  name_acquired_handler;
  65   GBusNameLostCallback      name_lost_handler;
  66   gpointer                  user_data;
  67   GDestroyNotify            user_data_free_func;
  68   GMainContext             *main_context;
  69
  70   PreviousCall              previous_call;
  71
  72   GDBusConnection          *connection;
  73   gulong                    disconnected_signal_handler_id;
  74   guint                     name_acquired_subscription_id;
  75   guint                     name_lost_subscription_id;
  76
  77   gboolean                  cancelled;
  78
  79   gboolean                  needs_release;
  80 } Client;
  81
  82 static guint next_global_id = 1;
  83 static GHashTable *map_id_to_client = NULL;
  84
  85
  86 static Client *
  87 client_ref (Client *client)
  88 {
  89   g_atomic_int_inc (&client->ref_count);
  90   return client;
  91 }
  92
  93 static void
  94 client_unref (Client *client)
  95 {
  96   if (g_atomic_int_dec_and_test (&client->ref_count))
  97     {
  98       if (client->connection != NULL)
  99         {
 100           if (client->disconnected_signal_handler_id > 0)
 101             g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id);
 102           if (client->name_acquired_subscription_id > 0)
 103             g_dbus_connection_signal_unsubscribe (client->connection, client->name_acquired_subscription_id);
 104           if (client->name_lost_subscription_id > 0)
 105             g_dbus_connection_signal_unsubscribe (client->connection, client->name_lost_subscription_id);
 106           g_object_unref (client->connection);
 107         }
 108       g_main_context_unref (client->main_context);
 109       g_free (client->name);
 110       if (client->user_data_free_func != NULL)
 111         client->user_data_free_func (client->user_data);
 112       g_free (client);
 113     }
 114 }
 115
 116 /* ---------------------------------------------------------------------------------------------------- */
 117
 118
 119 typedef enum
 120 {
 121   CALL_TYPE_NAME_ACQUIRED,
 122   CALL_TYPE_NAME_LOST
 123 } CallType;
 124
 125 typedef struct
 126 {
 127   Client *client;
 128
 129   /* keep this separate because client->connection may
 130    * be set to NULL after scheduling the call
 131    */
 132   GDBusConnection *connection;
 133
 134   /* set to TRUE to call acquired */
 135   CallType call_type;
 136 } CallHandlerData;
 137
 138 static void
 139 call_handler_data_free (CallHandlerData *data)
 140 {
 141   if (data->connection != NULL)
 142     g_object_unref (data->connection);
 143   client_unref (data->client);
 144   g_free (data);
 145 }
 146
 147 static void
 148 actually_do_call (Client *client, GDBusConnection *connection, CallType call_type)
 149 {
 150   switch (call_type)
 151     {
 152     case CALL_TYPE_NAME_ACQUIRED:
 153       if (client->name_acquired_handler != NULL)
 154         {
 155           client->name_acquired_handler (connection,
 156                                          client->name,
 157                                          client->user_data);
 158         }
 159       break;
 160
 161     case CALL_TYPE_NAME_LOST:
 162       if (client->name_lost_handler != NULL)
 163         {
 164           client->name_lost_handler (connection,
 165                                      client->name,
 166                                      client->user_data);
 167         }
 168       break;
 169
 170     default:
 171       g_assert_not_reached ();
 172       break;
 173     }
 174 }
 175
 176 static gboolean
 177 call_in_idle_cb (gpointer _data)
 178 {
 179   CallHandlerData *data = _data;
 180   actually_do_call (data->client, data->connection, data->call_type);
 181   return FALSE;
 182 }
 183
 184 static void
 185 schedule_call_in_idle (Client *client, CallType  call_type)
 186 {
 187   CallHandlerData *data;
 188   GSource *idle_source;
 189
 190   data = g_new0 (CallHandlerData, 1);
 191   data->client = client_ref (client);
 192   data->connection = client->connection != NULL ? g_object_ref (client->connection) : NULL;
 193   data->call_type = call_type;
 194
 195   idle_source = g_idle_source_new ();
 196   g_source_set_priority (idle_source, G_PRIORITY_HIGH);
 197   g_source_set_callback (idle_source,
 198                          call_in_idle_cb,
 199                          data,
 200                          (GDestroyNotify) call_handler_data_free);
 201   g_source_attach (idle_source, client->main_context);
 202   g_source_unref (idle_source);
 203 }
 204
 205 static void
 206 do_call (Client *client, CallType call_type)
 207 {
 208   GMainContext *current_context;
 209
 210   /* only schedule in idle if we're not in the right thread */
 211   current_context = g_main_context_ref_thread_default ();
 212   if (current_context != client->main_context)
 213     schedule_call_in_idle (client, call_type);
 214   else
 215     actually_do_call (client, client->connection, call_type);
 216   g_main_context_unref (current_context);
 217 }
 218
 219 static void
 220 call_acquired_handler (Client *client)
 221 {
 222   if (client->previous_call != PREVIOUS_CALL_ACQUIRED)
 223     {
 224       client->previous_call = PREVIOUS_CALL_ACQUIRED;
 225       if (!client->cancelled)
 226         {
 227           do_call (client, CALL_TYPE_NAME_ACQUIRED);
 228         }
 229     }
 230 }
 231
 232 static void
 233 call_lost_handler (Client  *client)
 234 {
 235   if (client->previous_call != PREVIOUS_CALL_LOST)
 236     {
 237       client->previous_call = PREVIOUS_CALL_LOST;
 238       if (!client->cancelled)
 239         {
 240           do_call (client, CALL_TYPE_NAME_LOST);
 241         }
 242     }
 243 }
 244
 245 /* ---------------------------------------------------------------------------------------------------- */
 246
 247 static void
 248 on_name_lost_or_acquired (GDBusConnection  *connection,
 249                           const gchar      *sender_name,
 250                           const gchar      *object_path,
 251                           const gchar      *interface_name,
 252                           const gchar      *signal_name,
 253                           GVariant         *parameters,
 254                           gpointer          user_data)
 255 {
 256   Client *client = user_data;
 257   const gchar *name;
 258
 259   if (g_strcmp0 (object_path, "/org/freedesktop/DBus") != 0 ||
 260       g_strcmp0 (interface_name, "org.freedesktop.DBus") != 0 ||
 261       g_strcmp0 (sender_name, "org.freedesktop.DBus") != 0)
 262     goto out;
 263
 264   if (g_strcmp0 (signal_name, "NameLost") == 0)
 265     {
 266       g_variant_get (parameters, "(&s)", &name);
 267       if (g_strcmp0 (name, client->name) == 0)
 268         {
 269           call_lost_handler (client);
 270         }
 271     }
 272   else if (g_strcmp0 (signal_name, "NameAcquired") == 0)
 273     {
 274       g_variant_get (parameters, "(&s)", &name);
 275       if (g_strcmp0 (name, client->name) == 0)
 276         {
 277           call_acquired_handler (client);
 278         }
 279     }
 280  out:
 281   ;
 282 }
 283
 284 /* ---------------------------------------------------------------------------------------------------- */
 285
 286 static void
 287 request_name_cb (GObject      *source_object,
 288                  GAsyncResult *res,
 289                  gpointer      user_data)
 290 {
 291   Client *client = user_data;
 292   GVariant *result;
 293   guint32 request_name_reply;
 294   gboolean subscribe;
 295
 296   request_name_reply = 0;
 297   result = NULL;
 298
 299   result = g_dbus_connection_call_finish (client->connection,
 300                                           res,
 301                                           NULL);
 302   if (result != NULL)
 303     {
 304       g_variant_get (result, "(u)", &request_name_reply);
 305       g_variant_unref (result);
 306     }
 307
 308   subscribe = FALSE;
 309
 310   switch (request_name_reply)
 311     {
 312     case 1: /* DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER */
 313       /* We got the name - now listen for NameLost and NameAcquired */
 314       call_acquired_handler (client);
 315       subscribe = TRUE;
 316       client->needs_release = TRUE;
 317       break;
 318
 319     case 2: /* DBUS_REQUEST_NAME_REPLY_IN_QUEUE */
 320       /* Waiting in line - listen for NameLost and NameAcquired */
 321       call_lost_handler (client);
 322       subscribe = TRUE;
 323       client->needs_release = TRUE;
 324       break;
 325
 326     default:
 327       /* assume we couldn't get the name - explicit fallthrough */
 328     case 3: /* DBUS_REQUEST_NAME_REPLY_EXISTS */
 329     case 4: /* DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER */
 330       /* Some other part of the process is already owning the name */
 331       call_lost_handler (client);
 332       break;
 333     }
 334
 335   if (subscribe)
 336     {
 337       /* start listening to NameLost and NameAcquired messages */
 338       client->name_lost_subscription_id =
 339         g_dbus_connection_signal_subscribe (client->connection,
 340                                             "org.freedesktop.DBus",
 341                                             "org.freedesktop.DBus",
 342                                             "NameLost",
 343                                             "/org/freedesktop/DBus",
 344                                             client->name,
 345                                             G_DBUS_SIGNAL_FLAGS_NONE,
 346                                             on_name_lost_or_acquired,
 347                                             client,
 348                                             NULL);
 349       client->name_acquired_subscription_id =
 350         g_dbus_connection_signal_subscribe (client->connection,
 351                                             "org.freedesktop.DBus",
 352                                             "org.freedesktop.DBus",
 353                                             "NameAcquired",
 354                                             "/org/freedesktop/DBus",
 355                                             client->name,
 356                                             G_DBUS_SIGNAL_FLAGS_NONE,
 357                                             on_name_lost_or_acquired,
 358                                             client,
 359                                             NULL);
 360     }
 361
 362   client_unref (client);
 363 }
 364
 365 /* ---------------------------------------------------------------------------------------------------- */
 366
 367 static void
 368 on_connection_disconnected (GDBusConnection *connection,
 369                             gboolean         remote_peer_vanished,
 370                             GError          *error,
 371                             gpointer         user_data)
 372 {
 373   Client *client = user_data;
 374
 375   if (client->disconnected_signal_handler_id > 0)
 376     g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id);
 377   if (client->name_acquired_subscription_id > 0)
 378     g_dbus_connection_signal_unsubscribe (client->connection, client->name_acquired_subscription_id);
 379   if (client->name_lost_subscription_id > 0)
 380     g_dbus_connection_signal_unsubscribe (client->connection, client->name_lost_subscription_id);
 381   g_object_unref (client->connection);
 382   client->disconnected_signal_handler_id = 0;
 383   client->name_acquired_subscription_id = 0;
 384   client->name_lost_subscription_id = 0;
 385   client->connection = NULL;
 386
 387   call_lost_handler (client);
 388 }
 389
 390 /* ---------------------------------------------------------------------------------------------------- */
 391
 392 static void
 393 has_connection (Client *client)
 394 {
 395   /* listen for disconnection */
 396   client->disconnected_signal_handler_id = g_signal_connect (client->connection,
 397                                                              "closed",
 398                                                              G_CALLBACK (on_connection_disconnected),
 399                                                              client);
 400
 401   /* attempt to acquire the name */
 402   g_dbus_connection_call (client->connection,
 403                           "org.freedesktop.DBus",  /* bus name */
 404                           "/org/freedesktop/DBus", /* object path */
 405                           "org.freedesktop.DBus",  /* interface name */
 406                           "RequestName",           /* method name */
 407                           g_variant_new ("(su)",
 408                                          client->name,
 409                                          client->flags),
 410                           G_VARIANT_TYPE ("(u)"),
 411                           G_DBUS_CALL_FLAGS_NONE,
 412                           -1,
 413                           NULL,
 414                           (GAsyncReadyCallback) request_name_cb,
 415                           client_ref (client));
 416 }
 417
 418
 419 static void
 420 connection_get_cb (GObject      *source_object,
 421                    GAsyncResult *res,
 422                    gpointer      user_data)
 423 {
 424   Client *client = user_data;
 425
 426   client->connection = g_bus_get_finish (res, NULL);
 427   if (client->connection == NULL)
 428     {
 429       call_lost_handler (client);
 430       goto out;
 431     }
 432
 433   /* No need to schedule this in idle as we're already in the thread
 434    * that the user called g_bus_own_name() from. This is because
 435    * g_bus_get() guarantees that.
 436    *
 437    * Also, we need to ensure that the handler is invoked *before*
 438    * we call RequestName(). Otherwise there is a race.
 439    */
 440   if (client->bus_acquired_handler != NULL)
 441     {
 442       client->bus_acquired_handler (client->connection,
 443                                     client->name,
 444                                     client->user_data);
 445     }
 446
 447   has_connection (client);
 448
 449  out:
 450   client_unref (client);
 451 }
 452
 453 /* ---------------------------------------------------------------------------------------------------- */
 454
 455 /**
 456  * g_bus_own_name_on_connection:
 457  * @connection: A #GDBusConnection.
 458  * @name: The well-known name to own.
 459  * @flags: A set of flags from the #GBusNameOwnerFlags enumeration.
 460  * @name_acquired_handler: Handler to invoke when @name is acquired or %NULL.
 461  * @name_lost_handler: Handler to invoke when @name is lost or %NULL.
 462  * @user_data: User data to pass to handlers.
 463  * @user_data_free_func: Function for freeing @user_data or %NULL.
 464  *
 465  * Like g_bus_own_name() but takes a #GDBusConnection instead of a
 466  * #GBusType.
 467  *
 468  * Returns: An identifier (never 0) that an be used with
 469  * g_bus_unown_name() to stop owning the name.
 470  *
 471  * Since: 2.26
 472  */
 473 guint
 474 g_bus_own_name_on_connection (GDBusConnection          *connection,
 475                               const gchar              *name,
 476                               GBusNameOwnerFlags        flags,
 477                               GBusNameAcquiredCallback  name_acquired_handler,
 478                               GBusNameLostCallback      name_lost_handler,
 479                               gpointer                  user_data,
 480                               GDestroyNotify            user_data_free_func)
 481 {
 482   Client *client;
 483
 484   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
 485   g_return_val_if_fail (g_dbus_is_name (name) && !g_dbus_is_unique_name (name), 0);
 486
 487   G_LOCK (lock);
 488
 489   client = g_new0 (Client, 1);
 490   client->ref_count = 1;
 491   client->id = next_global_id++; /* TODO: uh oh, handle overflow */
 492   client->name = g_strdup (name);
 493   client->flags = flags;
 494   client->name_acquired_handler = name_acquired_handler;
 495   client->name_lost_handler = name_lost_handler;
 496   client->user_data = user_data;
 497   client->user_data_free_func = user_data_free_func;
 498   client->main_context = g_main_context_ref_thread_default ();
 499
 500   client->connection = g_object_ref (connection);
 501
 502   if (map_id_to_client == NULL)
 503     {
 504       map_id_to_client = g_hash_table_new (g_direct_hash, g_direct_equal);
 505     }
 506   g_hash_table_insert (map_id_to_client,
 507                        GUINT_TO_POINTER (client->id),
 508                        client);
 509
 510   G_UNLOCK (lock);
 511
 512   has_connection (client);
 513
 514   return client->id;
 515 }
 516
 517 /**
 518  * g_bus_own_name:
 519  * @bus_type: The type of bus to own a name on.
 520  * @name: The well-known name to own.
 521  * @flags: A set of flags from the #GBusNameOwnerFlags enumeration.
 522  * @bus_acquired_handler: Handler to invoke when connected to the bus of type @bus_type or %NULL.
 523  * @name_acquired_handler: Handler to invoke when @name is acquired or %NULL.
 524  * @name_lost_handler: Handler to invoke when @name is lost or %NULL.
 525  * @user_data: User data to pass to handlers.
 526  * @user_data_free_func: Function for freeing @user_data or %NULL.
 527  *
 528  * Starts acquiring @name on the bus specified by @bus_type and calls
 529  * @name_acquired_handler and @name_lost_handler when the name is
 530  * acquired respectively lost. Callbacks will be invoked in the <link
 531  * linkend="g-main-context-push-thread-default">thread-default main
 532  * loop</link> of the thread you are calling this function from.
 533  *
 534  * You are guaranteed that one of the @name_acquired_handler and @name_lost_handler
 535  * callbacks will be invoked after calling this function - there are three
 536  * possible cases:
 537  * <itemizedlist>
 538  *   <listitem><para>
 539  *     @name_lost_handler with a %NULL connection (if a connection to the bus can't be made).
 540  *   </para></listitem>
 541  *   <listitem><para>
 542  *     @bus_acquired_handler then @name_lost_handler (if the name can't be obtained)
 543  *   </para></listitem>
 544  *   <listitem><para>
 545  *     @bus_acquired_handler then @name_acquired_handler (if the name was obtained).
 546  *   </para></listitem>
 547  * </itemizedlist>
 548  * When you are done owning the name, just call g_bus_unown_name()
 549  * with the owner id this function returns.
 550  *
 551  * If the name is acquired or lost (for example another application
 552  * could acquire the name if you allow replacement or the application
 553  * currently owning the name exits), the handlers are also invoked. If the
 554  * #GDBusConnection that is used for attempting to own the name
 555  * closes, then @name_lost_handler is invoked since it is no
 556  * longer possible for other processes to access the process.
 557  *
 558  * You cannot use g_bus_own_name() several times for the same name (unless
 559  * interleaved with calls to g_bus_unown_name()) - only the first call
 560  * will work.
 561  *
 562  * Another guarantee is that invocations of @name_acquired_handler
 563  * and @name_lost_handler are guaranteed to alternate; that
 564  * is, if @name_acquired_handler is invoked then you are
 565  * guaranteed that the next time one of the handlers is invoked, it
 566  * will be @name_lost_handler. The reverse is also true.
 567  *
 568  * If you plan on exporting objects (using e.g.
 569  * g_dbus_connection_register_object()), note that it is generally too late
 570  * to export the objects in @name_acquired_handler. Instead, you can do this
 571  * in @bus_acquired_handler since you are guaranteed that this will run
 572  * before @name is requested from the bus.
 573  *
 574  * This behavior makes it very simple to write applications that wants
 575  * to own names and export objects, see <xref linkend="gdbus-owning-names"/>.
 576  * Simply register objects to be exported in @bus_acquired_handler and
 577  * unregister the objects (if any) in @name_lost_handler.
 578  *
 579  * Returns: An identifier (never 0) that an be used with
 580  * g_bus_unown_name() to stop owning the name.
 581  *
 582  * Since: 2.26
 583  */
 584 guint
 585 g_bus_own_name (GBusType                  bus_type,
 586                 const gchar              *name,
 587                 GBusNameOwnerFlags        flags,
 588                 GBusAcquiredCallback      bus_acquired_handler,
 589                 GBusNameAcquiredCallback  name_acquired_handler,
 590                 GBusNameLostCallback      name_lost_handler,
 591                 gpointer                  user_data,
 592                 GDestroyNotify            user_data_free_func)
 593 {
 594   Client *client;
 595
 596   g_return_val_if_fail (g_dbus_is_name (name) && !g_dbus_is_unique_name (name), 0);
 597
 598   G_LOCK (lock);
 599
 600   client = g_new0 (Client, 1);
 601   client->ref_count = 1;
 602   client->id = next_global_id++; /* TODO: uh oh, handle overflow */
 603   client->name = g_strdup (name);
 604   client->flags = flags;
 605   client->bus_acquired_handler = bus_acquired_handler;
 606   client->name_acquired_handler = name_acquired_handler;
 607   client->name_lost_handler = name_lost_handler;
 608   client->user_data = user_data;
 609   client->user_data_free_func = user_data_free_func;
 610   client->main_context = g_main_context_ref_thread_default ();
 611
 612   if (map_id_to_client == NULL)
 613     {
 614       map_id_to_client = g_hash_table_new (g_direct_hash, g_direct_equal);
 615     }
 616   g_hash_table_insert (map_id_to_client,
 617                        GUINT_TO_POINTER (client->id),
 618                        client);
 619
 620   g_bus_get (bus_type,
 621              NULL,
 622              connection_get_cb,
 623              client_ref (client));
 624
 625   G_UNLOCK (lock);
 626
 627   return client->id;
 628 }
 629
 630 typedef struct {
 631   GClosure *bus_acquired_closure;
 632   GClosure *name_acquired_closure;
 633   GClosure *name_lost_closure;
 634 } OwnNameData;
 635
 636 static OwnNameData *
 637 own_name_data_new (GClosure *bus_acquired_closure,
 638                    GClosure *name_acquired_closure,
 639                    GClosure *name_lost_closure)
 640 {
 641   OwnNameData *data;
 642
 643   data = g_new0 (OwnNameData, 1);
 644
 645   if (bus_acquired_closure != NULL)
 646     {
 647       data->bus_acquired_closure = g_closure_ref (bus_acquired_closure);
 648       g_closure_sink (bus_acquired_closure);
 649       if (G_CLOSURE_NEEDS_MARSHAL (bus_acquired_closure))
 650         g_closure_set_marshal (bus_acquired_closure, g_cclosure_marshal_generic);
 651     }
 652
 653   if (name_acquired_closure != NULL)
 654     {
 655       data->name_acquired_closure = g_closure_ref (name_acquired_closure);
 656       g_closure_sink (name_acquired_closure);
 657       if (G_CLOSURE_NEEDS_MARSHAL (name_acquired_closure))
 658         g_closure_set_marshal (name_acquired_closure, g_cclosure_marshal_generic);
 659     }
 660
 661   if (name_lost_closure != NULL)
 662     {
 663       data->name_lost_closure = g_closure_ref (name_lost_closure);
 664       g_closure_sink (name_lost_closure);
 665       if (G_CLOSURE_NEEDS_MARSHAL (name_lost_closure))
 666         g_closure_set_marshal (name_lost_closure, g_cclosure_marshal_generic);
 667     }
 668
 669   return data;
 670 }
 671
 672 static void
 673 own_with_closures_on_bus_acquired (GDBusConnection *connection,
 674                                    const gchar     *name,
 675                                    gpointer         user_data)
 676 {
 677   OwnNameData *data = user_data;
 678   GValue params[2] = { { 0, }, { 0, } };
 679
 680   g_value_init (&params[0], G_TYPE_DBUS_CONNECTION);
 681   g_value_set_object (&params[0], connection);
 682
 683   g_value_init (&params[1], G_TYPE_STRING);
 684   g_value_set_string (&params[1], name);
 685
 686   g_closure_invoke (data->bus_acquired_closure, NULL, 2, params, NULL);
 687
 688   g_value_unset (params + 0);
 689   g_value_unset (params + 1);
 690 }
 691
 692 static void
 693 own_with_closures_on_name_acquired (GDBusConnection *connection,
 694                                     const gchar     *name,
 695                                     gpointer         user_data)
 696 {
 697   OwnNameData *data = user_data;
 698   GValue params[2] = { { 0, }, { 0, } };
 699
 700   g_value_init (&params[0], G_TYPE_DBUS_CONNECTION);
 701   g_value_set_object (&params[0], connection);
 702
 703   g_value_init (&params[1], G_TYPE_STRING);
 704   g_value_set_string (&params[1], name);
 705
 706   g_closure_invoke (data->name_acquired_closure, NULL, 2, params, NULL);
 707
 708   g_value_unset (params + 0);
 709   g_value_unset (params + 1);
 710 }
 711
 712 static void
 713 own_with_closures_on_name_lost (GDBusConnection *connection,
 714                                 const gchar     *name,
 715                                 gpointer         user_data)
 716 {
 717   OwnNameData *data = user_data;
 718   GValue params[2] = { { 0, }, { 0, } };
 719
 720   g_value_init (&params[0], G_TYPE_DBUS_CONNECTION);
 721   g_value_set_object (&params[0], connection);
 722
 723   g_value_init (&params[1], G_TYPE_STRING);
 724   g_value_set_string (&params[1], name);
 725
 726   g_closure_invoke (data->name_lost_closure, NULL, 2, params, NULL);
 727
 728   g_value_unset (params + 0);
 729   g_value_unset (params + 1);
 730 }
 731
 732 static void
 733 bus_own_name_free_func (gpointer user_data)
 734 {
 735   OwnNameData *data = user_data;
 736
 737   if (data->bus_acquired_closure != NULL)
 738     g_closure_unref (data->bus_acquired_closure);
 739
 740   if (data->name_acquired_closure != NULL)
 741     g_closure_unref (data->name_acquired_closure);
 742
 743   if (data->name_lost_closure != NULL)
 744     g_closure_unref (data->name_lost_closure);
 745
 746   g_free (data);
 747 }
 748
 749 /**
 750  * g_bus_own_name_with_closures:
 751  * @bus_type: The type of bus to own a name on.
 752  * @name: The well-known name to own.
 753  * @flags: A set of flags from the #GBusNameOwnerFlags enumeration.
 754  * @bus_acquired_closure: (allow-none): #GClosure to invoke when connected to
 755  * the bus of type @bus_type or %NULL.
 756  * @name_acquired_closure: (allow-none): #GClosure to invoke when @name is
 757  * acquired or %NULL.
 758  * @name_lost_closure: (allow-none): #GClosure to invoke when @name is lost or
 759  * %NULL.
 760  *
 761  * Version of g_bus_own_name() using closures instead of callbacks for
 762  * easier binding in other languages.
 763  *
 764  * Returns: An identifier (never 0) that an be used with
 765  * g_bus_unown_name() to stop owning the name.
 766  *
 767  * Rename to: g_bus_own_name
 768  *
 769  * Since: 2.26
 770  */
 771 guint
 772 g_bus_own_name_with_closures (GBusType                  bus_type,
 773                               const gchar              *name,
 774                               GBusNameOwnerFlags        flags,
 775                               GClosure                 *bus_acquired_closure,
 776                               GClosure                 *name_acquired_closure,
 777                               GClosure                 *name_lost_closure)
 778 {
 779   return g_bus_own_name (bus_type,
 780           name,
 781           flags,
 782           bus_acquired_closure != NULL ? own_with_closures_on_bus_acquired : NULL,
 783           name_acquired_closure != NULL ? own_with_closures_on_name_acquired : NULL,
 784           name_lost_closure != NULL ? own_with_closures_on_name_lost : NULL,
 785           own_name_data_new (bus_acquired_closure,
 786                              name_acquired_closure,
 787                              name_lost_closure),
 788           bus_own_name_free_func);
 789 }
 790
 791 /**
 792  * g_bus_own_name_on_connection_with_closures:
 793  * @connection: A #GDBusConnection.
 794  * @name: The well-known name to own.
 795  * @flags: A set of flags from the #GBusNameOwnerFlags enumeration.
 796  * @name_acquired_closure: (allow-none): #GClosure to invoke when @name is
 797  * acquired or %NULL.
 798  * @name_lost_closure: (allow-none): #GClosure to invoke when @name is lost or
 799  * %NULL.
 800  *
 801  * Version of g_bus_own_name_on_connection() using closures instead of callbacks for
 802  * easier binding in other languages.
 803  *
 804  * Returns: An identifier (never 0) that an be used with
 805  * g_bus_unown_name() to stop owning the name.
 806  *
 807  * Rename to: g_bus_own_name_on_connection
 808  *
 809  * Since: 2.26
 810  */
 811 guint
 812 g_bus_own_name_on_connection_with_closures (GDBusConnection          *connection,
 813                                             const gchar              *name,
 814                                             GBusNameOwnerFlags        flags,
 815                                             GClosure                 *name_acquired_closure,
 816                                             GClosure                 *name_lost_closure)
 817 {
 818   return g_bus_own_name_on_connection (connection,
 819           name,
 820           flags,
 821           name_acquired_closure != NULL ? own_with_closures_on_name_acquired : NULL,
 822           name_lost_closure != NULL ? own_with_closures_on_name_lost : NULL,
 823           own_name_data_new (NULL,
 824                              name_acquired_closure,
 825                              name_lost_closure),
 826           bus_own_name_free_func);
 827 }
 828
 829 /**
 830  * g_bus_unown_name:
 831  * @owner_id: An identifier obtained from g_bus_own_name()
 832  *
 833  * Stops owning a name.
 834  *
 835  * Since: 2.26
 836  */
 837 void
 838 g_bus_unown_name (guint owner_id)
 839 {
 840   Client *client;
 841
 842   g_return_if_fail (owner_id > 0);
 843
 844   client = NULL;
 845
 846   G_LOCK (lock);
 847   if (owner_id == 0 || map_id_to_client == NULL ||
 848       (client = g_hash_table_lookup (map_id_to_client, GUINT_TO_POINTER (owner_id))) == NULL)
 849     {
 850       g_warning ("Invalid id %d passed to g_bus_unown_name()", owner_id);
 851       goto out;
 852     }
 853
 854   client->cancelled = TRUE;
 855   g_warn_if_fail (g_hash_table_remove (map_id_to_client, GUINT_TO_POINTER (owner_id)));
 856
 857  out:
 858   G_UNLOCK (lock);
 859
 860   /* do callback without holding lock */
 861   if (client != NULL)
 862     {
 863       /* Release the name if needed */
 864       if (client->needs_release && client->connection != NULL)
 865         {
 866           GVariant *result;
 867           GError *error;
 868           guint32 release_name_reply;
 869
 870           /* TODO: it kinda sucks having to do a sync call to release the name - but if
 871            * we don't, then a subsequent grab of the name will make the bus daemon return
 872            * IN_QUEUE which will trigger name_lost().
 873            *
 874            * I believe this is a bug in the bus daemon.
 875            */
 876           error = NULL;
 877           result = g_dbus_connection_call_sync (client->connection,
 878                                                 "org.freedesktop.DBus",  /* bus name */
 879                                                 "/org/freedesktop/DBus", /* object path */
 880                                                 "org.freedesktop.DBus",  /* interface name */
 881                                                 "ReleaseName",           /* method name */
 882                                                 g_variant_new ("(s)", client->name),
 883                                                 G_VARIANT_TYPE ("(u)"),
 884                                                 G_DBUS_CALL_FLAGS_NONE,
 885                                                 -1,
 886                                                 NULL,
 887                                                 &error);
 888           if (result == NULL)
 889             {
 890               g_warning ("Error releasing name %s: %s", client->name, error->message);
 891               g_error_free (error);
 892             }
 893           else
 894             {
 895               g_variant_get (result, "(u)", &release_name_reply);
 896               if (release_name_reply != 1 /* DBUS_RELEASE_NAME_REPLY_RELEASED */)
 897                 {
 898                   g_warning ("Unexpected reply %d when releasing name %s", release_name_reply, client->name);
 899                 }
 900               g_variant_unref (result);
 901             }
 902         }
 903
 904       if (client->disconnected_signal_handler_id > 0)
 905         g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id);
 906       if (client->name_acquired_subscription_id > 0)
 907         g_dbus_connection_signal_unsubscribe (client->connection, client->name_acquired_subscription_id);
 908       if (client->name_lost_subscription_id > 0)
 909         g_dbus_connection_signal_unsubscribe (client->connection, client->name_lost_subscription_id);
 910       client->disconnected_signal_handler_id = 0;
 911       client->name_acquired_subscription_id = 0;
 912       client->name_lost_subscription_id = 0;
 913       if (client->connection != NULL)
 914         {
 915           g_object_unref (client->connection);
 916           client->connection = NULL;
 917         }
 918
 919       client_unref (client);
 920     }
 921 }