gio/gdbusconnection.h

   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, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: David Zeuthen <davidz@redhat.com>
  19  */
  20
  21 #ifndef __G_DBUS_CONNECTION_H__
  22 #define __G_DBUS_CONNECTION_H__
  23
  24 #if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
  25 #error "Only <gio/gio.h> can be included directly."
  26 #endif
  27
  28 #include <gio/giotypes.h>
  29
  30 G_BEGIN_DECLS
  31
  32 #define G_TYPE_DBUS_CONNECTION         (g_dbus_connection_get_type ())
  33 #define G_DBUS_CONNECTION(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_DBUS_CONNECTION, GDBusConnection))
  34 #define G_IS_DBUS_CONNECTION(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_DBUS_CONNECTION))
  35
  36 GLIB_AVAILABLE_IN_ALL
  37 GType            g_dbus_connection_get_type                   (void) G_GNUC_CONST;
  38
  39 /* ---------------------------------------------------------------------------------------------------- */
  40
  41 GLIB_AVAILABLE_IN_ALL
  42 void              g_bus_get                    (GBusType             bus_type,
  43                                                 GCancellable        *cancellable,
  44                                                 GAsyncReadyCallback  callback,
  45                                                 gpointer             user_data);
  46 GLIB_AVAILABLE_IN_ALL
  47 GDBusConnection  *g_bus_get_finish             (GAsyncResult        *res,
  48                                                 GError             **error);
  49 GLIB_AVAILABLE_IN_ALL
  50 GDBusConnection  *g_bus_get_sync               (GBusType            bus_type,
  51                                                 GCancellable       *cancellable,
  52                                                 GError            **error);
  53
  54 /* ---------------------------------------------------------------------------------------------------- */
  55
  56 GLIB_AVAILABLE_IN_ALL
  57 void             g_dbus_connection_new                        (GIOStream              *stream,
  58                                                                const gchar            *guid,
  59                                                                GDBusConnectionFlags    flags,
  60                                                                GDBusAuthObserver      *observer,
  61                                                                GCancellable           *cancellable,
  62                                                                GAsyncReadyCallback     callback,
  63                                                                gpointer                user_data);
  64 GLIB_AVAILABLE_IN_ALL
  65 GDBusConnection *g_dbus_connection_new_finish                 (GAsyncResult           *res,
  66                                                                GError                **error);
  67 GLIB_AVAILABLE_IN_ALL
  68 GDBusConnection *g_dbus_connection_new_sync                   (GIOStream              *stream,
  69                                                                const gchar            *guid,
  70                                                                GDBusConnectionFlags    flags,
  71                                                                GDBusAuthObserver      *observer,
  72                                                                GCancellable           *cancellable,
  73                                                                GError                **error);
  74
  75 GLIB_AVAILABLE_IN_ALL
  76 void             g_dbus_connection_new_for_address            (const gchar            *address,
  77                                                                GDBusConnectionFlags    flags,
  78                                                                GDBusAuthObserver      *observer,
  79                                                                GCancellable           *cancellable,
  80                                                                GAsyncReadyCallback     callback,
  81                                                                gpointer                user_data);
  82 GLIB_AVAILABLE_IN_ALL
  83 GDBusConnection *g_dbus_connection_new_for_address_finish     (GAsyncResult           *res,
  84                                                                GError                **error);
  85 GLIB_AVAILABLE_IN_ALL
  86 GDBusConnection *g_dbus_connection_new_for_address_sync       (const gchar            *address,
  87                                                                GDBusConnectionFlags    flags,
  88                                                                GDBusAuthObserver      *observer,
  89                                                                GCancellable           *cancellable,
  90                                                                GError                **error);
  91
  92 /* ---------------------------------------------------------------------------------------------------- */
  93
  94 GLIB_AVAILABLE_IN_ALL
  95 void             g_dbus_connection_start_message_processing   (GDBusConnection    *connection);
  96 GLIB_AVAILABLE_IN_ALL
  97 gboolean         g_dbus_connection_is_closed                  (GDBusConnection    *connection);
  98 GLIB_AVAILABLE_IN_ALL
  99 GIOStream       *g_dbus_connection_get_stream                 (GDBusConnection    *connection);
 100 GLIB_AVAILABLE_IN_ALL
 101 const gchar     *g_dbus_connection_get_guid                   (GDBusConnection    *connection);
 102 GLIB_AVAILABLE_IN_ALL
 103 const gchar     *g_dbus_connection_get_unique_name            (GDBusConnection    *connection);
 104 GLIB_AVAILABLE_IN_ALL
 105 GCredentials    *g_dbus_connection_get_peer_credentials       (GDBusConnection    *connection);
 106
 107 GLIB_AVAILABLE_IN_2_34
 108 guint32          g_dbus_connection_get_last_serial            (GDBusConnection    *connection);
 109
 110 GLIB_AVAILABLE_IN_ALL
 111 gboolean         g_dbus_connection_get_exit_on_close          (GDBusConnection    *connection);
 112 GLIB_AVAILABLE_IN_ALL
 113 void             g_dbus_connection_set_exit_on_close          (GDBusConnection    *connection,
 114                                                                gboolean            exit_on_close);
 115 GLIB_AVAILABLE_IN_ALL
 116 GDBusCapabilityFlags  g_dbus_connection_get_capabilities      (GDBusConnection    *connection);
 117
 118 /* ---------------------------------------------------------------------------------------------------- */
 119
 120 GLIB_AVAILABLE_IN_ALL
 121 void             g_dbus_connection_close                          (GDBusConnection     *connection,
 122                                                                    GCancellable        *cancellable,
 123                                                                    GAsyncReadyCallback  callback,
 124                                                                    gpointer             user_data);
 125 GLIB_AVAILABLE_IN_ALL
 126 gboolean         g_dbus_connection_close_finish                   (GDBusConnection     *connection,
 127                                                                    GAsyncResult        *res,
 128                                                                    GError             **error);
 129 GLIB_AVAILABLE_IN_ALL
 130 gboolean         g_dbus_connection_close_sync                     (GDBusConnection     *connection,
 131                                                                    GCancellable        *cancellable,
 132                                                                    GError             **error);
 133
 134 /* ---------------------------------------------------------------------------------------------------- */
 135
 136 GLIB_AVAILABLE_IN_ALL
 137 void             g_dbus_connection_flush                          (GDBusConnection     *connection,
 138                                                                    GCancellable        *cancellable,
 139                                                                    GAsyncReadyCallback  callback,
 140                                                                    gpointer             user_data);
 141 GLIB_AVAILABLE_IN_ALL
 142 gboolean         g_dbus_connection_flush_finish                   (GDBusConnection     *connection,
 143                                                                    GAsyncResult        *res,
 144                                                                    GError             **error);
 145 GLIB_AVAILABLE_IN_ALL
 146 gboolean         g_dbus_connection_flush_sync                     (GDBusConnection     *connection,
 147                                                                    GCancellable        *cancellable,
 148                                                                    GError             **error);
 149
 150 /* ---------------------------------------------------------------------------------------------------- */
 151
 152 GLIB_AVAILABLE_IN_ALL
 153 gboolean         g_dbus_connection_send_message                   (GDBusConnection     *connection,
 154                                                                    GDBusMessage        *message,
 155                                                                    GDBusSendMessageFlags flags,
 156                                                                    volatile guint32    *out_serial,
 157                                                                    GError             **error);
 158 GLIB_AVAILABLE_IN_ALL
 159 void             g_dbus_connection_send_message_with_reply        (GDBusConnection     *connection,
 160                                                                    GDBusMessage        *message,
 161                                                                    GDBusSendMessageFlags flags,
 162                                                                    gint                 timeout_msec,
 163                                                                    volatile guint32    *out_serial,
 164                                                                    GCancellable        *cancellable,
 165                                                                    GAsyncReadyCallback  callback,
 166                                                                    gpointer             user_data);
 167 GLIB_AVAILABLE_IN_ALL
 168 GDBusMessage    *g_dbus_connection_send_message_with_reply_finish (GDBusConnection     *connection,
 169                                                                    GAsyncResult        *res,
 170                                                                    GError             **error);
 171 GLIB_AVAILABLE_IN_ALL
 172 GDBusMessage    *g_dbus_connection_send_message_with_reply_sync   (GDBusConnection     *connection,
 173                                                                    GDBusMessage        *message,
 174                                                                    GDBusSendMessageFlags flags,
 175                                                                    gint                 timeout_msec,
 176                                                                    volatile guint32    *out_serial,
 177                                                                    GCancellable        *cancellable,
 178                                                                    GError             **error);
 179
 180 /* ---------------------------------------------------------------------------------------------------- */
 181
 182 GLIB_AVAILABLE_IN_ALL
 183 gboolean  g_dbus_connection_emit_signal                       (GDBusConnection    *connection,
 184                                                                const gchar        *destination_bus_name,
 185                                                                const gchar        *object_path,
 186                                                                const gchar        *interface_name,
 187                                                                const gchar        *signal_name,
 188                                                                GVariant           *parameters,
 189                                                                GError            **error);
 190 GLIB_AVAILABLE_IN_ALL
 191 void      g_dbus_connection_call                              (GDBusConnection    *connection,
 192                                                                const gchar        *bus_name,
 193                                                                const gchar        *object_path,
 194                                                                const gchar        *interface_name,
 195                                                                const gchar        *method_name,
 196                                                                GVariant           *parameters,
 197                                                                const GVariantType *reply_type,
 198                                                                GDBusCallFlags      flags,
 199                                                                gint                timeout_msec,
 200                                                                GCancellable       *cancellable,
 201                                                                GAsyncReadyCallback callback,
 202                                                                gpointer            user_data);
 203 GLIB_AVAILABLE_IN_ALL
 204 GVariant *g_dbus_connection_call_finish                       (GDBusConnection    *connection,
 205                                                                GAsyncResult       *res,
 206                                                                GError            **error);
 207 GLIB_AVAILABLE_IN_ALL
 208 GVariant *g_dbus_connection_call_sync                         (GDBusConnection    *connection,
 209                                                                const gchar        *bus_name,
 210                                                                const gchar        *object_path,
 211                                                                const gchar        *interface_name,
 212                                                                const gchar        *method_name,
 213                                                                GVariant           *parameters,
 214                                                                const GVariantType *reply_type,
 215                                                                GDBusCallFlags      flags,
 216                                                                gint                timeout_msec,
 217                                                                GCancellable       *cancellable,
 218                                                                GError            **error);
 219 GLIB_AVAILABLE_IN_2_30
 220 void      g_dbus_connection_call_with_unix_fd_list            (GDBusConnection    *connection,
 221                                                                const gchar        *bus_name,
 222                                                                const gchar        *object_path,
 223                                                                const gchar        *interface_name,
 224                                                                const gchar        *method_name,
 225                                                                GVariant           *parameters,
 226                                                                const GVariantType *reply_type,
 227                                                                GDBusCallFlags      flags,
 228                                                                gint                timeout_msec,
 229                                                                GUnixFDList        *fd_list,
 230                                                                GCancellable       *cancellable,
 231                                                                GAsyncReadyCallback callback,
 232                                                                gpointer            user_data);
 233 GLIB_AVAILABLE_IN_2_30
 234 GVariant *g_dbus_connection_call_with_unix_fd_list_finish     (GDBusConnection    *connection,
 235                                                                GUnixFDList       **out_fd_list,
 236                                                                GAsyncResult       *res,
 237                                                                GError            **error);
 238 GLIB_AVAILABLE_IN_2_30
 239 GVariant *g_dbus_connection_call_with_unix_fd_list_sync       (GDBusConnection    *connection,
 240                                                                const gchar        *bus_name,
 241                                                                const gchar        *object_path,
 242                                                                const gchar        *interface_name,
 243                                                                const gchar        *method_name,
 244                                                                GVariant           *parameters,
 245                                                                const GVariantType *reply_type,
 246                                                                GDBusCallFlags      flags,
 247                                                                gint                timeout_msec,
 248                                                                GUnixFDList        *fd_list,
 249                                                                GUnixFDList       **out_fd_list,
 250                                                                GCancellable       *cancellable,
 251                                                                GError            **error);
 252
 253 /* ---------------------------------------------------------------------------------------------------- */
 254
 255
 256 /**
 257  * GDBusInterfaceMethodCallFunc:
 258  * @connection: A #GDBusConnection.
 259  * @sender: The unique bus name of the remote caller.
 260  * @object_path: The object path that the method was invoked on.
 261  * @interface_name: The D-Bus interface name the method was invoked on.
 262  * @method_name: The name of the method that was invoked.
 263  * @parameters: A #GVariant tuple with parameters.
 264  * @invocation: A #GDBusMethodInvocation object that can be used to return a value or error.
 265  * @user_data: The @user_data #gpointer passed to g_dbus_connection_register_object().
 266  *
 267  * The type of the @method_call function in #GDBusInterfaceVTable.
 268  *
 269  * Since: 2.26
 270  */
 271 typedef void (*GDBusInterfaceMethodCallFunc) (GDBusConnection       *connection,
 272                                               const gchar           *sender,
 273                                               const gchar           *object_path,
 274                                               const gchar           *interface_name,
 275                                               const gchar           *method_name,
 276                                               GVariant              *parameters,
 277                                               GDBusMethodInvocation *invocation,
 278                                               gpointer               user_data);
 279
 280 /**
 281  * GDBusInterfaceGetPropertyFunc:
 282  * @connection: A #GDBusConnection.
 283  * @sender: The unique bus name of the remote caller.
 284  * @object_path: The object path that the method was invoked on.
 285  * @interface_name: The D-Bus interface name for the property.
 286  * @property_name: The name of the property to get the value of.
 287  * @error: Return location for error.
 288  * @user_data: The @user_data #gpointer passed to g_dbus_connection_register_object().
 289  *
 290  * The type of the @get_property function in #GDBusInterfaceVTable.
 291  *
 292  * Returns: A #GVariant with the value for @property_name or %NULL if
 293  *     @error is set. If the returned #GVariant is floating, it is
 294  *     consumed - otherwise its reference count is decreased by one.
 295  *
 296  * Since: 2.26
 297  */
 298 typedef GVariant *(*GDBusInterfaceGetPropertyFunc) (GDBusConnection       *connection,
 299                                                     const gchar           *sender,
 300                                                     const gchar           *object_path,
 301                                                     const gchar           *interface_name,
 302                                                     const gchar           *property_name,
 303                                                     GError               **error,
 304                                                     gpointer               user_data);
 305
 306 /**
 307  * GDBusInterfaceSetPropertyFunc:
 308  * @connection: A #GDBusConnection.
 309  * @sender: The unique bus name of the remote caller.
 310  * @object_path: The object path that the method was invoked on.
 311  * @interface_name: The D-Bus interface name for the property.
 312  * @property_name: The name of the property to get the value of.
 313  * @value: The value to set the property to.
 314  * @error: Return location for error.
 315  * @user_data: The @user_data #gpointer passed to g_dbus_connection_register_object().
 316  *
 317  * The type of the @set_property function in #GDBusInterfaceVTable.
 318  *
 319  * Returns: %TRUE if the property was set to @value, %FALSE if @error is set.
 320  *
 321  * Since: 2.26
 322  */
 323 typedef gboolean  (*GDBusInterfaceSetPropertyFunc) (GDBusConnection       *connection,
 324                                                     const gchar           *sender,
 325                                                     const gchar           *object_path,
 326                                                     const gchar           *interface_name,
 327                                                     const gchar           *property_name,
 328                                                     GVariant              *value,
 329                                                     GError               **error,
 330                                                     gpointer               user_data);
 331
 332 /**
 333  * GDBusInterfaceVTable:
 334  * @method_call: Function for handling incoming method calls.
 335  * @get_property: Function for getting a property.
 336  * @set_property: Function for setting a property.
 337  *
 338  * Virtual table for handling properties and method calls for a D-Bus
 339  * interface.
 340  *
 341  * Since 2.38, if you want to handle getting/setting D-Bus properties
 342  * asynchronously, give %NULL as your get_property() or set_property()
 343  * function.  The D-Bus call will be directed to your @method_call
 344  * function, with the provided @interface_name set to
 345  * <literal>"org.freedesktop.DBus.Properties"</literal>.
 346  *
 347  * The usual checks on the validity of the calls is performed.  For
 348  * <literal>'Get'</literal> calls, an error is automatically returned if
 349  * the property does not exist or the permissions do not allow access.
 350  * The same checks are performed for <literal>'Set'</literal> calls, and
 351  * the provided value is also checked for being the correct type.
 352  *
 353  * For both <literal>'Get'</literal> and <literal>'Set'</literal> calls,
 354  * the #GDBusMethodInvocation passed to the method_call handler can be
 355  * queried with g_dbus_method_invocation_get_property_info() to get a
 356  * pointer to the #GDBusPropertyInfo of the property.
 357  *
 358  * If you have readable properties specified in your interface info, you
 359  * must ensure that you either provide a non-%NULL @get_property()
 360  * function or provide implementations of both the
 361  * <literal>'Get'</literal> and <literal>'GetAll'</literal> methods on
 362  * the <literal>'org.freedesktop.DBus.Properties'</literal> interface in
 363  * your @method_call function.  Note that the required return type of
 364  * the <literal>'Get'</literal> call is <literal>(v)</literal>, not the
 365  * type of the property.  <literal>'GetAll'</literal> expects a return
 366  * value of type <literal>a{sv}</literal>.
 367  *
 368  * If you have writable properties specified in your interface info, you
 369  * must ensure that you either provide a non-%NULL @set_property()
 370  * function or provide an implementation of the <literal>'Set'</literal>
 371  * call.  If implementing the call, you must return the value of type
 372  * %G_VARIANT_TYPE_UNIT.
 373  *
 374  * Since: 2.26
 375  */
 376 struct _GDBusInterfaceVTable
 377 {
 378   GDBusInterfaceMethodCallFunc  method_call;
 379   GDBusInterfaceGetPropertyFunc get_property;
 380   GDBusInterfaceSetPropertyFunc set_property;
 381
 382   /*< private >*/
 383   /* Padding for future expansion - also remember to update
 384    * gdbusconnection.c:_g_dbus_interface_vtable_copy() when
 385    * changing this.
 386    */
 387   gpointer padding[8];
 388 };
 389
 390 GLIB_AVAILABLE_IN_ALL
 391 guint            g_dbus_connection_register_object            (GDBusConnection            *connection,
 392                                                                const gchar                *object_path,
 393                                                                GDBusInterfaceInfo         *interface_info,
 394                                                                const GDBusInterfaceVTable *vtable,
 395                                                                gpointer                    user_data,
 396                                                                GDestroyNotify              user_data_free_func,
 397                                                                GError                    **error);
 398 GLIB_AVAILABLE_IN_ALL
 399 gboolean         g_dbus_connection_unregister_object          (GDBusConnection            *connection,
 400                                                                guint                       registration_id);
 401
 402 /* ---------------------------------------------------------------------------------------------------- */
 403
 404 /**
 405  * GDBusSubtreeEnumerateFunc:
 406  * @connection: A #GDBusConnection.
 407  * @sender: The unique bus name of the remote caller.
 408  * @object_path: The object path that was registered with g_dbus_connection_register_subtree().
 409  * @user_data: The @user_data #gpointer passed to g_dbus_connection_register_subtree().
 410  *
 411  * The type of the @enumerate function in #GDBusSubtreeVTable.
 412  *
 413  * This function is called when generating introspection data and also
 414  * when preparing to dispatch incoming messages in the event that the
 415  * %G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES flag is not
 416  * specified (ie: to verify that the object path is valid).
 417  *
 418  * Hierarchies are not supported; the items that you return should not
 419  * contain the '/' character.
 420  *
 421  * The return value will be freed with g_strfreev().
 422  *
 423  * Returns: A newly allocated array of strings for node names that are children of @object_path.
 424  *
 425  * Since: 2.26
 426  */
 427 typedef gchar** (*GDBusSubtreeEnumerateFunc) (GDBusConnection       *connection,
 428                                               const gchar           *sender,
 429                                               const gchar           *object_path,
 430                                               gpointer               user_data);
 431
 432 /**
 433  * GDBusSubtreeIntrospectFunc:
 434  * @connection: A #GDBusConnection.
 435  * @sender: The unique bus name of the remote caller.
 436  * @object_path: The object path that was registered with g_dbus_connection_register_subtree().
 437  * @node: A node that is a child of @object_path (relative to @object_path) or %NULL for the root of the subtree.
 438  * @user_data: The @user_data #gpointer passed to g_dbus_connection_register_subtree().
 439  *
 440  * The type of the @introspect function in #GDBusSubtreeVTable.
 441  *
 442  * Subtrees are flat.  @node, if non-%NULL, is always exactly one
 443  * segment of the object path (ie: it never contains a slash).
 444  *
 445  * This function should return %NULL to indicate that there is no object
 446  * at this node.
 447  *
 448  * If this function returns non-%NULL, the return value is expected to
 449  * be a %NULL-terminated array of pointers to #GDBusInterfaceInfo
 450  * structures describing the interfaces implemented by @node.  This
 451  * array will have g_dbus_interface_info_unref() called on each item
 452  * before being freed with g_free().
 453  *
 454  * The difference between returning %NULL and an array containing zero
 455  * items is that the standard DBus interfaces will returned to the
 456  * remote introspector in the empty array case, but not in the %NULL
 457  * case.
 458  *
 459  * Returns: A %NULL-terminated array of pointers to #GDBusInterfaceInfo, or %NULL.
 460  *
 461  * Since: 2.26
 462  */
 463 typedef GDBusInterfaceInfo ** (*GDBusSubtreeIntrospectFunc) (GDBusConnection       *connection,
 464                                                              const gchar           *sender,
 465                                                              const gchar           *object_path,
 466                                                              const gchar           *node,
 467                                                              gpointer               user_data);
 468
 469 /**
 470  * GDBusSubtreeDispatchFunc:
 471  * @connection: A #GDBusConnection.
 472  * @sender: The unique bus name of the remote caller.
 473  * @object_path: The object path that was registered with g_dbus_connection_register_subtree().
 474  * @interface_name: The D-Bus interface name that the method call or property access is for.
 475  * @node: A node that is a child of @object_path (relative to @object_path) or %NULL for the root of the subtree.
 476  * @out_user_data: Return location for user data to pass to functions in the returned #GDBusInterfaceVTable (never %NULL).
 477  * @user_data: The @user_data #gpointer passed to g_dbus_connection_register_subtree().
 478  *
 479  * The type of the @dispatch function in #GDBusSubtreeVTable.
 480  *
 481  * Subtrees are flat.  @node, if non-%NULL, is always exactly one
 482  * segment of the object path (ie: it never contains a slash).
 483  *
 484  * Returns: A #GDBusInterfaceVTable or %NULL if you don't want to handle the methods.
 485  *
 486  * Since: 2.26
 487  */
 488 typedef const GDBusInterfaceVTable * (*GDBusSubtreeDispatchFunc) (GDBusConnection             *connection,
 489                                                                   const gchar                 *sender,
 490                                                                   const gchar                 *object_path,
 491                                                                   const gchar                 *interface_name,
 492                                                                   const gchar                 *node,
 493                                                                   gpointer                    *out_user_data,
 494                                                                   gpointer                     user_data);
 495
 496 /**
 497  * GDBusSubtreeVTable:
 498  * @enumerate: Function for enumerating child nodes.
 499  * @introspect: Function for introspecting a child node.
 500  * @dispatch: Function for dispatching a remote call on a child node.
 501  *
 502  * Virtual table for handling subtrees registered with g_dbus_connection_register_subtree().
 503  *
 504  * Since: 2.26
 505  */
 506 struct _GDBusSubtreeVTable
 507 {
 508   GDBusSubtreeEnumerateFunc  enumerate;
 509   GDBusSubtreeIntrospectFunc introspect;
 510   GDBusSubtreeDispatchFunc   dispatch;
 511
 512   /*< private >*/
 513   /* Padding for future expansion - also remember to update
 514    * gdbusconnection.c:_g_dbus_subtree_vtable_copy() when
 515    * changing this.
 516    */
 517   gpointer padding[8];
 518 };
 519
 520 GLIB_AVAILABLE_IN_ALL
 521 guint            g_dbus_connection_register_subtree           (GDBusConnection            *connection,
 522                                                                const gchar                *object_path,
 523                                                                const GDBusSubtreeVTable   *vtable,
 524                                                                GDBusSubtreeFlags           flags,
 525                                                                gpointer                    user_data,
 526                                                                GDestroyNotify              user_data_free_func,
 527                                                                GError                    **error);
 528 GLIB_AVAILABLE_IN_ALL
 529 gboolean         g_dbus_connection_unregister_subtree         (GDBusConnection            *connection,
 530                                                                guint                       registration_id);
 531
 532 /* ---------------------------------------------------------------------------------------------------- */
 533
 534 /**
 535  * GDBusSignalCallback:
 536  * @connection: A #GDBusConnection.
 537  * @sender_name: The unique bus name of the sender of the signal.
 538  * @object_path: The object path that the signal was emitted on.
 539  * @interface_name: The name of the interface.
 540  * @signal_name: The name of the signal.
 541  * @parameters: A #GVariant tuple with parameters for the signal.
 542  * @user_data: User data passed when subscribing to the signal.
 543  *
 544  * Signature for callback function used in g_dbus_connection_signal_subscribe().
 545  *
 546  * Since: 2.26
 547  */
 548 typedef void (*GDBusSignalCallback) (GDBusConnection  *connection,
 549                                      const gchar      *sender_name,
 550                                      const gchar      *object_path,
 551                                      const gchar      *interface_name,
 552                                      const gchar      *signal_name,
 553                                      GVariant         *parameters,
 554                                      gpointer          user_data);
 555
 556 GLIB_AVAILABLE_IN_ALL
 557 guint            g_dbus_connection_signal_subscribe           (GDBusConnection     *connection,
 558                                                                const gchar         *sender,
 559                                                                const gchar         *interface_name,
 560                                                                const gchar         *member,
 561                                                                const gchar         *object_path,
 562                                                                const gchar         *arg0,
 563                                                                GDBusSignalFlags     flags,
 564                                                                GDBusSignalCallback  callback,
 565                                                                gpointer             user_data,
 566                                                                GDestroyNotify       user_data_free_func);
 567 GLIB_AVAILABLE_IN_ALL
 568 void             g_dbus_connection_signal_unsubscribe         (GDBusConnection     *connection,
 569                                                                guint                subscription_id);
 570
 571 /* ---------------------------------------------------------------------------------------------------- */
 572
 573 /**
 574  * GDBusMessageFilterFunction:
 575  * @connection: (transfer none): A #GDBusConnection.
 576  * @message: (transfer full): A locked #GDBusMessage that the filter function takes ownership of.
 577  * @incoming: %TRUE if it is a message received from the other peer, %FALSE if it is
 578  * a message to be sent to the other peer.
 579  * @user_data: User data passed when adding the filter.
 580  *
 581  * Signature for function used in g_dbus_connection_add_filter().
 582  *
 583  * A filter function is passed a #GDBusMessage and expected to return
 584  * a #GDBusMessage too. Passive filter functions that don't modify the
 585  * message can simply return the @message object:
 586  * |[
 587  * static GDBusMessage *
 588  * passive_filter (GDBusConnection *connection
 589  *                 GDBusMessage    *message,
 590  *                 gboolean         incoming,
 591  *                 gpointer         user_data)
 592  * {
 593  *   /<!-- -->* inspect @message *<!-- -->/
 594  *   return message;
 595  * }
 596  * ]|
 597  * Filter functions that wants to drop a message can simply return %NULL:
 598  * |[
 599  * static GDBusMessage *
 600  * drop_filter (GDBusConnection *connection
 601  *              GDBusMessage    *message,
 602  *              gboolean         incoming,
 603  *              gpointer         user_data)
 604  * {
 605  *   if (should_drop_message)
 606  *     {
 607  *       g_object_unref (message);
 608  *       message = NULL;
 609  *     }
 610  *   return message;
 611  * }
 612  * ]|
 613  * Finally, a filter function may modify a message by copying it:
 614  * |[
 615  * static GDBusMessage *
 616  * modifying_filter (GDBusConnection *connection
 617  *                   GDBusMessage    *message,
 618  *                   gboolean         incoming,
 619  *                   gpointer         user_data)
 620  * {
 621  *   GDBusMessage *copy;
 622  *   GError *error;
 623  *
 624  *   error = NULL;
 625  *   copy = g_dbus_message_copy (message, &error);
 626  *   /<!-- -->* handle @error being is set *<!-- -->/
 627  *   g_object_unref (message);
 628  *
 629  *   /<!-- -->* modify @copy *<!-- -->/
 630  *
 631  *   return copy;
 632  * }
 633  * ]|
 634  * If the returned #GDBusMessage is different from @message and cannot
 635  * be sent on @connection (it could use features, such as file
 636  * descriptors, not compatible with @connection), then a warning is
 637  * logged to <emphasis>standard error</emphasis>. Applications can
 638  * check this ahead of time using g_dbus_message_to_blob() passing a
 639  * #GDBusCapabilityFlags value obtained from @connection.
 640  *
 641  * Returns: (transfer full) (allow-none): A #GDBusMessage that will be freed with
 642  * g_object_unref() or %NULL to drop the message. Passive filter
 643  * functions can simply return the passed @message object.
 644  *
 645  * Since: 2.26
 646  */
 647 typedef GDBusMessage *(*GDBusMessageFilterFunction) (GDBusConnection *connection,
 648                                                      GDBusMessage    *message,
 649                                                      gboolean         incoming,
 650                                                      gpointer         user_data);
 651
 652 GLIB_AVAILABLE_IN_ALL
 653 guint g_dbus_connection_add_filter (GDBusConnection            *connection,
 654                                     GDBusMessageFilterFunction  filter_function,
 655                                     gpointer                    user_data,
 656                                     GDestroyNotify              user_data_free_func);
 657
 658 GLIB_AVAILABLE_IN_ALL
 659 void  g_dbus_connection_remove_filter (GDBusConnection    *connection,
 660                                        guint               filter_id);
 661
 662 /* ---------------------------------------------------------------------------------------------------- */
 663
 664
 665 G_END_DECLS
 666
 667 #endif /* __G_DBUS_CONNECTION_H__ */