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GDBusConnection

GDBusConnection — D-Bus Connections

Functions

void g_bus_get ()
GDBusConnection * g_bus_get_finish ()
GDBusConnection * g_bus_get_sync ()
void g_dbus_connection_new ()
GDBusConnection * g_dbus_connection_new_finish ()
GDBusConnection * g_dbus_connection_new_sync ()
void g_dbus_connection_new_for_address ()
GDBusConnection * g_dbus_connection_new_for_address_finish ()
GDBusConnection * g_dbus_connection_new_for_address_sync ()
void g_dbus_connection_start_message_processing ()
void g_dbus_connection_close ()
gboolean g_dbus_connection_close_finish ()
gboolean g_dbus_connection_close_sync ()
gboolean g_dbus_connection_is_closed ()
void g_dbus_connection_flush ()
gboolean g_dbus_connection_flush_finish ()
gboolean g_dbus_connection_flush_sync ()
gboolean g_dbus_connection_get_exit_on_close ()
void g_dbus_connection_set_exit_on_close ()
GIOStream * g_dbus_connection_get_stream ()
const gchar * g_dbus_connection_get_guid ()
const gchar * g_dbus_connection_get_unique_name ()
GDBusCapabilityFlags g_dbus_connection_get_capabilities ()
GCredentials * g_dbus_connection_get_peer_credentials ()
guint32 g_dbus_connection_get_last_serial ()
void g_dbus_connection_call ()
GVariant * g_dbus_connection_call_finish ()
GVariant * g_dbus_connection_call_sync ()
void g_dbus_connection_call_with_unix_fd_list ()
GVariant * g_dbus_connection_call_with_unix_fd_list_finish ()
GVariant * g_dbus_connection_call_with_unix_fd_list_sync ()
gboolean g_dbus_connection_emit_signal ()
void (*GDBusSignalCallback) ()
guint g_dbus_connection_signal_subscribe ()
void g_dbus_connection_signal_unsubscribe ()
gboolean g_dbus_connection_send_message ()
void g_dbus_connection_send_message_with_reply ()
GDBusMessage * g_dbus_connection_send_message_with_reply_finish ()
GDBusMessage * g_dbus_connection_send_message_with_reply_sync ()
GDBusMessage * (*GDBusMessageFilterFunction) ()
guint g_dbus_connection_add_filter ()
void g_dbus_connection_remove_filter ()
void (*GDBusInterfaceMethodCallFunc) ()
GVariant * (*GDBusInterfaceGetPropertyFunc) ()
gboolean (*GDBusInterfaceSetPropertyFunc) ()
guint g_dbus_connection_register_object ()
gboolean g_dbus_connection_unregister_object ()
guint g_dbus_connection_register_object_with_closures ()
gchar ** (*GDBusSubtreeEnumerateFunc) ()
GDBusInterfaceInfo ** (*GDBusSubtreeIntrospectFunc) ()
const GDBusInterfaceVTable * (*GDBusSubtreeDispatchFunc) ()
guint g_dbus_connection_register_subtree ()
gboolean g_dbus_connection_unregister_subtree ()

Properties

gchar * address Write / Construct Only
GDBusAuthObserver * authentication-observer Write / Construct Only
GDBusCapabilityFlags capabilities Read
gboolean closed Read
gboolean exit-on-close Read / Write
GDBusConnectionFlags flags Write / Construct Only
gchar * guid Read / Write / Construct Only
GIOStream * stream Read / Write / Construct Only
gchar * unique-name Read

Signals

Object Hierarchy

    GObject
    ╰── GDBusConnection

Implemented Interfaces

GDBusConnection implements GInitable and GAsyncInitable.

Includes

#include <gio/gio.h>

Description

The GDBusConnection type is used for D-Bus connections to remote peers such as a message buses. It is a low-level API that offers a lot of flexibility. For instance, it lets you establish a connection over any transport that can by represented as an GIOStream.

This class is rarely used directly in D-Bus clients. If you are writing a D-Bus client, it is often easier to use the g_bus_own_name(), g_bus_watch_name() or g_dbus_proxy_new_for_bus() APIs.

As an exception to the usual GLib rule that a particular object must not be used by two threads at the same time, GDBusConnection's methods may be called from any thread. This is so that g_bus_get() and g_bus_get_sync() can safely return the same GDBusConnection when called from any thread.

Most of the ways to obtain a GDBusConnection automatically initialize it (i.e. connect to D-Bus): for instance, g_dbus_connection_new() and g_bus_get(), and the synchronous versions of those methods, give you an initialized connection. Language bindings for GIO should use g_initable_new() or g_async_initable_new_async(), which also initialize the connection.

If you construct an uninitialized GDBusConnection, such as via g_object_new(), you must initialize it via g_initable_init() or g_async_initable_init_async() before using its methods or properties. Calling methods or accessing properties on a GDBusConnection that has not completed initialization successfully is considered to be invalid, and leads to undefined behaviour. In particular, if initialization fails with a GError, the only valid thing you can do with that GDBusConnection is to free it with g_object_unref().

An example D-Bus server

Here is an example for a D-Bus server: gdbus-example-server.c

An example for exporting a subtree

Here is an example for exporting a subtree: gdbus-example-subtree.c

An example for file descriptor passing

Here is an example for passing UNIX file descriptors: gdbus-unix-fd-client.c

An example for exporting a GObject

Here is an example for exporting a GObject: gdbus-example-export.c

Functions

g_bus_get ()

void
g_bus_get (GBusType bus_type,
           GCancellable *cancellable,
           GAsyncReadyCallback callback,
           gpointer user_data);

Asynchronously connects to the message bus specified by bus_type .

When the operation is finished, callback will be invoked. You can then call g_bus_get_finish() to get the result of the operation.

This is a asynchronous failable function. See g_bus_get_sync() for the synchronous version.

Parameters

bus_type

a GBusType

 

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied

 

user_data

the data to pass to callback

 

Since: 2.26


g_bus_get_finish ()

GDBusConnection *
g_bus_get_finish (GAsyncResult *res,
                  GError **error);

Finishes an operation started with g_bus_get().

The returned object is a singleton, that is, shared with other callers of g_bus_get() and g_bus_get_sync() for bus_type . In the event that you need a private message bus connection, use g_dbus_address_get_for_bus_sync() and g_dbus_connection_new_for_address().

Note that the returned GDBusConnection object will (usually) have the “exit-on-close” property set to TRUE.

Parameters

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_bus_get()

 

error

return location for error or NULL

 

Returns

a GDBusConnection or NULL if error is set. Free with g_object_unref().

[transfer full]

Since: 2.26


g_bus_get_sync ()

GDBusConnection *
g_bus_get_sync (GBusType bus_type,
                GCancellable *cancellable,
                GError **error);

Synchronously connects to the message bus specified by bus_type . Note that the returned object may shared with other callers, e.g. if two separate parts of a process calls this function with the same bus_type , they will share the same object.

This is a synchronous failable function. See g_bus_get() and g_bus_get_finish() for the asynchronous version.

The returned object is a singleton, that is, shared with other callers of g_bus_get() and g_bus_get_sync() for bus_type . In the event that you need a private message bus connection, use g_dbus_address_get_for_bus_sync() and g_dbus_connection_new_for_address().

Note that the returned GDBusConnection object will (usually) have the “exit-on-close” property set to TRUE.

Parameters

bus_type

a GBusType

 

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

a GDBusConnection or NULL if error is set. Free with g_object_unref().

[transfer full]

Since: 2.26


g_dbus_connection_new ()

void
g_dbus_connection_new (GIOStream *stream,
                       const gchar *guid,
                       GDBusConnectionFlags flags,
                       GDBusAuthObserver *observer,
                       GCancellable *cancellable,
                       GAsyncReadyCallback callback,
                       gpointer user_data);

Asynchronously sets up a D-Bus connection for exchanging D-Bus messages with the end represented by stream .

If stream is a GSocketConnection, then the corresponding GSocket will be put into non-blocking mode.

The D-Bus connection will interact with stream from a worker thread. As a result, the caller should not interact with stream after this method has been called, except by calling g_object_unref() on it.

If observer is not NULL it may be used to control the authentication process.

When the operation is finished, callback will be invoked. You can then call g_dbus_connection_new_finish() to get the result of the operation.

This is a asynchronous failable constructor. See g_dbus_connection_new_sync() for the synchronous version.

Parameters

stream

a GIOStream

 

guid

the GUID to use if a authenticating as a server or NULL.

[nullable]

flags

flags describing how to make the connection

 

observer

a GDBusAuthObserver or NULL.

[nullable]

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied

 

user_data

the data to pass to callback

 

Since: 2.26


g_dbus_connection_new_finish ()

GDBusConnection *
g_dbus_connection_new_finish (GAsyncResult *res,
                              GError **error);

Finishes an operation started with g_dbus_connection_new().

Parameters

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_new().

 

error

return location for error or NULL

 

Returns

a GDBusConnection or NULL if error is set. Free with g_object_unref().

Since: 2.26


g_dbus_connection_new_sync ()

GDBusConnection *
g_dbus_connection_new_sync (GIOStream *stream,
                            const gchar *guid,
                            GDBusConnectionFlags flags,
                            GDBusAuthObserver *observer,
                            GCancellable *cancellable,
                            GError **error);

Synchronously sets up a D-Bus connection for exchanging D-Bus messages with the end represented by stream .

If stream is a GSocketConnection, then the corresponding GSocket will be put into non-blocking mode.

The D-Bus connection will interact with stream from a worker thread. As a result, the caller should not interact with stream after this method has been called, except by calling g_object_unref() on it.

If observer is not NULL it may be used to control the authentication process.

This is a synchronous failable constructor. See g_dbus_connection_new() for the asynchronous version.

Parameters

stream

a GIOStream

 

guid

the GUID to use if a authenticating as a server or NULL.

[nullable]

flags

flags describing how to make the connection

 

observer

a GDBusAuthObserver or NULL.

[nullable]

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

a GDBusConnection or NULL if error is set. Free with g_object_unref().

Since: 2.26


g_dbus_connection_new_for_address ()

void
g_dbus_connection_new_for_address (const gchar *address,
                                   GDBusConnectionFlags flags,
                                   GDBusAuthObserver *observer,
                                   GCancellable *cancellable,
                                   GAsyncReadyCallback callback,
                                   gpointer user_data);

Asynchronously connects and sets up a D-Bus client connection for exchanging D-Bus messages with an endpoint specified by address which must be in the D-Bus address format.

This constructor can only be used to initiate client-side connections - use g_dbus_connection_new() if you need to act as the server. In particular, flags cannot contain the G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.

When the operation is finished, callback will be invoked. You can then call g_dbus_connection_new_finish() to get the result of the operation.

If observer is not NULL it may be used to control the authentication process.

This is a asynchronous failable constructor. See g_dbus_connection_new_for_address_sync() for the synchronous version.

Parameters

address

a D-Bus address

 

flags

flags describing how to make the connection

 

observer

a GDBusAuthObserver or NULL.

[nullable]

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied

 

user_data

the data to pass to callback

 

Since: 2.26


g_dbus_connection_new_for_address_finish ()

GDBusConnection *
g_dbus_connection_new_for_address_finish
                               (GAsyncResult *res,
                                GError **error);

Finishes an operation started with g_dbus_connection_new_for_address().

Parameters

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_new()

 

error

return location for error or NULL

 

Returns

a GDBusConnection or NULL if error is set. Free with g_object_unref().

Since: 2.26


g_dbus_connection_new_for_address_sync ()

GDBusConnection *
g_dbus_connection_new_for_address_sync
                               (const gchar *address,
                                GDBusConnectionFlags flags,
                                GDBusAuthObserver *observer,
                                GCancellable *cancellable,
                                GError **error);

Synchronously connects and sets up a D-Bus client connection for exchanging D-Bus messages with an endpoint specified by address which must be in the D-Bus address format.

This constructor can only be used to initiate client-side connections - use g_dbus_connection_new_sync() if you need to act as the server. In particular, flags cannot contain the G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.

This is a synchronous failable constructor. See g_dbus_connection_new_for_address() for the asynchronous version.

If observer is not NULL it may be used to control the authentication process.

Parameters

address

a D-Bus address

 

flags

flags describing how to make the connection

 

observer

a GDBusAuthObserver or NULL.

[nullable]

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

a GDBusConnection or NULL if error is set. Free with g_object_unref().

Since: 2.26


g_dbus_connection_start_message_processing ()

void
g_dbus_connection_start_message_processing
                               (GDBusConnection *connection);

If connection was created with G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING, this method starts processing messages. Does nothing on if connection wasn't created with this flag or if the method has already been called.

Parameters

connection

a GDBusConnection

 

Since: 2.26


g_dbus_connection_close ()

void
g_dbus_connection_close (GDBusConnection *connection,
                         GCancellable *cancellable,
                         GAsyncReadyCallback callback,
                         gpointer user_data);

Closes connection . Note that this never causes the process to exit (this might only happen if the other end of a shared message bus connection disconnects, see “exit-on-close”).

Once the connection is closed, operations such as sending a message will return with the error G_IO_ERROR_CLOSED. Closing a connection will not automatically flush the connection so queued messages may be lost. Use g_dbus_connection_flush() if you need such guarantees.

If connection is already closed, this method fails with G_IO_ERROR_CLOSED.

When connection has been closed, the “closed” signal is emitted in the thread-default main context of the thread that connection was constructed in.

This is an asynchronous method. When the operation is finished, callback will be invoked in the thread-default main context of the thread you are calling this method from. You can then call g_dbus_connection_close_finish() to get the result of the operation. See g_dbus_connection_close_sync() for the synchronous version.

Parameters

connection

a GDBusConnection

 

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied or NULL if you don't care about the result.

[nullable]

user_data

The data to pass to callback

 

Since: 2.26


g_dbus_connection_close_finish ()

gboolean
g_dbus_connection_close_finish (GDBusConnection *connection,
                                GAsyncResult *res,
                                GError **error);

Finishes an operation started with g_dbus_connection_close().

Parameters

connection

a GDBusConnection

 

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_close()

 

error

return location for error or NULL

 

Returns

TRUE if the operation succeeded, FALSE if error is set

Since: 2.26


g_dbus_connection_close_sync ()

gboolean
g_dbus_connection_close_sync (GDBusConnection *connection,
                              GCancellable *cancellable,
                              GError **error);

Synchronously closees connection . The calling thread is blocked until this is done. See g_dbus_connection_close() for the asynchronous version of this method and more details about what it does.

Parameters

connection

a GDBusConnection

 

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

TRUE if the operation succeeded, FALSE if error is set

Since: 2.26


g_dbus_connection_is_closed ()

gboolean
g_dbus_connection_is_closed (GDBusConnection *connection);

Gets whether connection is closed.

Parameters

connection

a GDBusConnection

 

Returns

TRUE if the connection is closed, FALSE otherwise

Since: 2.26


g_dbus_connection_flush ()

void
g_dbus_connection_flush (GDBusConnection *connection,
                         GCancellable *cancellable,
                         GAsyncReadyCallback callback,
                         gpointer user_data);

Asynchronously flushes connection , that is, writes all queued outgoing message to the transport and then flushes the transport (using g_output_stream_flush_async()). This is useful in programs that wants to emit a D-Bus signal and then exit immediately. Without flushing the connection, there is no guaranteed that the message has been sent to the networking buffers in the OS kernel.

This is an asynchronous method. When the operation is finished, callback will be invoked in the thread-default main context of the thread you are calling this method from. You can then call g_dbus_connection_flush_finish() to get the result of the operation. See g_dbus_connection_flush_sync() for the synchronous version.

Parameters

connection

a GDBusConnection

 

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied or NULL if you don't care about the result.

[nullable]

user_data

The data to pass to callback

 

Since: 2.26


g_dbus_connection_flush_finish ()

gboolean
g_dbus_connection_flush_finish (GDBusConnection *connection,
                                GAsyncResult *res,
                                GError **error);

Finishes an operation started with g_dbus_connection_flush().

Parameters

connection

a GDBusConnection

 

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_flush()

 

error

return location for error or NULL

 

Returns

TRUE if the operation succeeded, FALSE if error is set

Since: 2.26


g_dbus_connection_flush_sync ()

gboolean
g_dbus_connection_flush_sync (GDBusConnection *connection,
                              GCancellable *cancellable,
                              GError **error);

Synchronously flushes connection . The calling thread is blocked until this is done. See g_dbus_connection_flush() for the asynchronous version of this method and more details about what it does.

Parameters

connection

a GDBusConnection

 

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

TRUE if the operation succeeded, FALSE if error is set

Since: 2.26


g_dbus_connection_get_exit_on_close ()

gboolean
g_dbus_connection_get_exit_on_close (GDBusConnection *connection);

Gets whether the process is terminated when connection is closed by the remote peer. See “exit-on-close” for more details.

Parameters

connection

a GDBusConnection

 

Returns

whether the process is terminated when connection is closed by the remote peer

Since: 2.26


g_dbus_connection_set_exit_on_close ()

void
g_dbus_connection_set_exit_on_close (GDBusConnection *connection,
                                     gboolean exit_on_close);

Sets whether the process should be terminated when connection is closed by the remote peer. See “exit-on-close” for more details.

Note that this function should be used with care. Most modern UNIX desktops tie the notion of a user session the session bus, and expect all of a users applications to quit when their bus connection goes away. If you are setting exit_on_close to FALSE for the shared session bus connection, you should make sure that your application exits when the user session ends.

Parameters

connection

a GDBusConnection

 

exit_on_close

whether the process should be terminated when connection is closed by the remote peer

 

Since: 2.26


g_dbus_connection_get_stream ()

GIOStream *
g_dbus_connection_get_stream (GDBusConnection *connection);

Gets the underlying stream used for IO.

While the GDBusConnection is active, it will interact with this stream from a worker thread, so it is not safe to interact with the stream directly.

Parameters

connection

a GDBusConnection

 

Returns

the stream used for IO.

[transfer none]

Since: 2.26


g_dbus_connection_get_guid ()

const gchar *
g_dbus_connection_get_guid (GDBusConnection *connection);

The GUID of the peer performing the role of server when authenticating. See “guid” for more details.

Parameters

connection

a GDBusConnection

 

Returns

The GUID. Do not free this string, it is owned by connection .

Since: 2.26


g_dbus_connection_get_unique_name ()

const gchar *
g_dbus_connection_get_unique_name (GDBusConnection *connection);

Gets the unique name of connection as assigned by the message bus. This can also be used to figure out if connection is a message bus connection.

Parameters

connection

a GDBusConnection

 

Returns

the unique name or NULL if connection is not a message bus connection. Do not free this string, it is owned by connection .

Since: 2.26


g_dbus_connection_get_capabilities ()

GDBusCapabilityFlags
g_dbus_connection_get_capabilities (GDBusConnection *connection);

Gets the capabilities negotiated with the remote peer

Parameters

connection

a GDBusConnection

 

Returns

zero or more flags from the GDBusCapabilityFlags enumeration

Since: 2.26


g_dbus_connection_get_peer_credentials ()

GCredentials *
g_dbus_connection_get_peer_credentials
                               (GDBusConnection *connection);

Gets the credentials of the authenticated peer. This will always return NULL unless connection acted as a server (e.g. G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER was passed) when set up and the client passed credentials as part of the authentication process.

In a message bus setup, the message bus is always the server and each application is a client. So this method will always return NULL for message bus clients.

Parameters

connection

a GDBusConnection

 

Returns

a GCredentials or NULL if not available. Do not free this object, it is owned by connection .

[transfer none][nullable]

Since: 2.26


g_dbus_connection_get_last_serial ()

guint32
g_dbus_connection_get_last_serial (GDBusConnection *connection);

Retrieves the last serial number assigned to a GDBusMessage on the current thread. This includes messages sent via both low-level API such as g_dbus_connection_send_message() as well as high-level API such as g_dbus_connection_emit_signal(), g_dbus_connection_call() or g_dbus_proxy_call().

Parameters

connection

a GDBusConnection

 

Returns

the last used serial or zero when no message has been sent within the current thread

Since: 2.34


g_dbus_connection_call ()

void
g_dbus_connection_call (GDBusConnection *connection,
                        const gchar *bus_name,
                        const gchar *object_path,
                        const gchar *interface_name,
                        const gchar *method_name,
                        GVariant *parameters,
                        const GVariantType *reply_type,
                        GDBusCallFlags flags,
                        gint timeout_msec,
                        GCancellable *cancellable,
                        GAsyncReadyCallback callback,
                        gpointer user_data);

Asynchronously invokes the method_name method on the interface_name D-Bus interface on the remote object at object_path owned by bus_name .

If connection is closed then the operation will fail with G_IO_ERROR_CLOSED. If cancellable is canceled, the operation will fail with G_IO_ERROR_CANCELLED. If parameters contains a value not compatible with the D-Bus protocol, the operation fails with G_IO_ERROR_INVALID_ARGUMENT.

If reply_type is non-NULL then the reply will be checked for having this type and an error will be raised if it does not match. Said another way, if you give a reply_type then any non-NULL return value will be of this type.

If the parameters GVariant is floating, it is consumed. This allows convenient 'inline' use of g_variant_new(), e.g.:

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g_dbus_connection_call (connection,
                        "org.freedesktop.StringThings",
                        "/org/freedesktop/StringThings",
                        "org.freedesktop.StringThings",
                        "TwoStrings",
                        g_variant_new ("(ss)",
                                       "Thing One",
                                       "Thing Two"),
                        NULL,
                        G_DBUS_CALL_FLAGS_NONE,
                        -1,
                        NULL,
                        (GAsyncReadyCallback) two_strings_done,
                        NULL);

This is an asynchronous method. When the operation is finished, callback will be invoked in the thread-default main context of the thread you are calling this method from. You can then call g_dbus_connection_call_finish() to get the result of the operation. See g_dbus_connection_call_sync() for the synchronous version of this function.

If callback is NULL then the D-Bus method call message will be sent with the G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED flag set.

Parameters

connection

a GDBusConnection

 

bus_name

a unique or well-known bus name or NULL if connection is not a message bus connection.

[nullable]

object_path

path of remote object

 

interface_name

D-Bus interface to invoke method on

 

method_name

the name of the method to invoke

 

parameters

a GVariant tuple with parameters for the method or NULL if not passing parameters.

[nullable]

reply_type

the expected type of the reply, or NULL.

[nullable]

flags

flags from the GDBusCallFlags enumeration

 

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

 

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied or NULL if you don't care about the result of the method invocation.

[nullable]

user_data

the data to pass to callback

 

Since: 2.26


g_dbus_connection_call_finish ()

GVariant *
g_dbus_connection_call_finish (GDBusConnection *connection,
                               GAsyncResult *res,
                               GError **error);

Finishes an operation started with g_dbus_connection_call().

Parameters

connection

a GDBusConnection

 

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_call()

 

error

return location for error or NULL

 

Returns

NULL if error is set. Otherwise a GVariant tuple with return values. Free with g_variant_unref().

Since: 2.26


g_dbus_connection_call_sync ()

GVariant *
g_dbus_connection_call_sync (GDBusConnection *connection,
                             const gchar *bus_name,
                             const gchar *object_path,
                             const gchar *interface_name,
                             const gchar *method_name,
                             GVariant *parameters,
                             const GVariantType *reply_type,
                             GDBusCallFlags flags,
                             gint timeout_msec,
                             GCancellable *cancellable,
                             GError **error);

Synchronously invokes the method_name method on the interface_name D-Bus interface on the remote object at object_path owned by bus_name .

If connection is closed then the operation will fail with G_IO_ERROR_CLOSED. If cancellable is canceled, the operation will fail with G_IO_ERROR_CANCELLED. If parameters contains a value not compatible with the D-Bus protocol, the operation fails with G_IO_ERROR_INVALID_ARGUMENT.

If reply_type is non-NULL then the reply will be checked for having this type and an error will be raised if it does not match. Said another way, if you give a reply_type then any non-NULL return value will be of this type.

If the parameters GVariant is floating, it is consumed. This allows convenient 'inline' use of g_variant_new(), e.g.:

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g_dbus_connection_call_sync (connection,
                             "org.freedesktop.StringThings",
                             "/org/freedesktop/StringThings",
                             "org.freedesktop.StringThings",
                             "TwoStrings",
                             g_variant_new ("(ss)",
                                            "Thing One",
                                            "Thing Two"),
                             NULL,
                             G_DBUS_CALL_FLAGS_NONE,
                             -1,
                             NULL,
                             &error);

The calling thread is blocked until a reply is received. See g_dbus_connection_call() for the asynchronous version of this method.

Parameters

connection

a GDBusConnection

 

bus_name

a unique or well-known bus name or NULL if connection is not a message bus connection.

[nullable]

object_path

path of remote object

 

interface_name

D-Bus interface to invoke method on

 

method_name

the name of the method to invoke

 

parameters

a GVariant tuple with parameters for the method or NULL if not passing parameters.

[nullable]

reply_type

the expected type of the reply, or NULL.

[nullable]

flags

flags from the GDBusCallFlags enumeration

 

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

 

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

NULL if error is set. Otherwise a GVariant tuple with return values. Free with g_variant_unref().

Since: 2.26


g_dbus_connection_call_with_unix_fd_list ()

void
g_dbus_connection_call_with_unix_fd_list
                               (GDBusConnection *connection,
                                const gchar *bus_name,
                                const gchar *object_path,
                                const gchar *interface_name,
                                const gchar *method_name,
                                GVariant *parameters,
                                const GVariantType *reply_type,
                                GDBusCallFlags flags,
                                gint timeout_msec,
                                GUnixFDList *fd_list,
                                GCancellable *cancellable,
                                GAsyncReadyCallback callback,
                                gpointer user_data);

Like g_dbus_connection_call() but also takes a GUnixFDList object.

This method is only available on UNIX.

Parameters

connection

a GDBusConnection

 

bus_name

a unique or well-known bus name or NULL if connection is not a message bus connection.

[nullable]

object_path

path of remote object

 

interface_name

D-Bus interface to invoke method on

 

method_name

the name of the method to invoke

 

parameters

a GVariant tuple with parameters for the method or NULL if not passing parameters.

[nullable]

reply_type

the expected type of the reply, or NULL.

[nullable]

flags

flags from the GDBusCallFlags enumeration

 

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

 

fd_list

a GUnixFDList or NULL.

[nullable]

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied or NULL if you don't * care about the result of the method invocation.

[nullable]

user_data

The data to pass to callback .

 

Since: 2.30


g_dbus_connection_call_with_unix_fd_list_finish ()

GVariant *
g_dbus_connection_call_with_unix_fd_list_finish
                               (GDBusConnection *connection,
                                GUnixFDList **out_fd_list,
                                GAsyncResult *res,
                                GError **error);

Finishes an operation started with g_dbus_connection_call_with_unix_fd_list().

Parameters

connection

a GDBusConnection

 

out_fd_list

return location for a GUnixFDList or NULL.

[out][optional]

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_call_with_unix_fd_list()

 

error

return location for error or NULL

 

Returns

NULL if error is set. Otherwise a GVariant tuple with return values. Free with g_variant_unref().

Since: 2.30


g_dbus_connection_call_with_unix_fd_list_sync ()

GVariant *
g_dbus_connection_call_with_unix_fd_list_sync
                               (GDBusConnection *connection,
                                const gchar *bus_name,
                                const gchar *object_path,
                                const gchar *interface_name,
                                const gchar *method_name,
                                GVariant *parameters,
                                const GVariantType *reply_type,
                                GDBusCallFlags flags,
                                gint timeout_msec,
                                GUnixFDList *fd_list,
                                GUnixFDList **out_fd_list,
                                GCancellable *cancellable,
                                GError **error);

Like g_dbus_connection_call_sync() but also takes and returns GUnixFDList objects.

This method is only available on UNIX.

Parameters

connection

a GDBusConnection

 

bus_name

a unique or well-known bus name or NULL if connection is not a message bus connection.

[nullable]

object_path

path of remote object

 

interface_name

D-Bus interface to invoke method on

 

method_name

the name of the method to invoke

 

parameters

a GVariant tuple with parameters for the method or NULL if not passing parameters.

[nullable]

reply_type

the expected type of the reply, or NULL.

[nullable]

flags

flags from the GDBusCallFlags enumeration

 

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

 

fd_list

a GUnixFDList or NULL.

[nullable]

out_fd_list

return location for a GUnixFDList or NULL.

[out][optional]

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

NULL if error is set. Otherwise a GVariant tuple with return values. Free with g_variant_unref().

Since: 2.30


g_dbus_connection_emit_signal ()

gboolean
g_dbus_connection_emit_signal (GDBusConnection *connection,
                               const gchar *destination_bus_name,
                               const gchar *object_path,
                               const gchar *interface_name,
                               const gchar *signal_name,
                               GVariant *parameters,
                               GError **error);

Emits a signal.

If the parameters GVariant is floating, it is consumed.

This can only fail if parameters is not compatible with the D-Bus protocol.

Parameters

connection

a GDBusConnection

 

destination_bus_name

the unique bus name for the destination for the signal or NULL to emit to all listeners.

[nullable]

object_path

path of remote object

 

interface_name

D-Bus interface to emit a signal on

 

signal_name

the name of the signal to emit

 

parameters

a GVariant tuple with parameters for the signal or NULL if not passing parameters.

[nullable]

error

Return location for error or NULL

 

Returns

TRUE unless error is set

Since: 2.26


GDBusSignalCallback ()

void
(*GDBusSignalCallback) (GDBusConnection *connection,
                        const gchar *sender_name,
                        const gchar *object_path,
                        const gchar *interface_name,
                        const gchar *signal_name,
                        GVariant *parameters,
                        gpointer user_data);

Signature for callback function used in g_dbus_connection_signal_subscribe().

Parameters

connection

A GDBusConnection.

 

sender_name

The unique bus name of the sender of the signal.

 

object_path

The object path that the signal was emitted on.

 

interface_name

The name of the interface.

 

signal_name

The name of the signal.

 

parameters

A GVariant tuple with parameters for the signal.

 

user_data

User data passed when subscribing to the signal.

 

Since: 2.26


g_dbus_connection_signal_subscribe ()

guint
g_dbus_connection_signal_subscribe (GDBusConnection *connection,
                                    const gchar *sender,
                                    const gchar *interface_name,
                                    const gchar *member,
                                    const gchar *object_path,
                                    const gchar *arg0,
                                    GDBusSignalFlags flags,
                                    GDBusSignalCallback callback,
                                    gpointer user_data,
                                    GDestroyNotify user_data_free_func);

Subscribes to signals on connection and invokes callback with a whenever the signal is received. Note that callback will be invoked in the thread-default main context of the thread you are calling this method from.

If connection is not a message bus connection, sender must be NULL.

If sender is a well-known name note that callback is invoked with the unique name for the owner of sender , not the well-known name as one would expect. This is because the message bus rewrites the name. As such, to avoid certain race conditions, users should be tracking the name owner of the well-known name and use that when processing the received signal.

If one of G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_NAMESPACE or G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_PATH are given, arg0 is interpreted as part of a namespace or path. The first argument of a signal is matched against that part as specified by D-Bus.

If user_data_free_func is non-NULL, it will be called (in the thread-default main context of the thread you are calling this method from) at some point after user_data is no longer needed. (It is not guaranteed to be called synchronously when the signal is unsubscribed from, and may be called after connection has been destroyed.)

Parameters

connection

a GDBusConnection

 

sender

sender name to match on (unique or well-known name) or NULL to listen from all senders.

[nullable]

interface_name

D-Bus interface name to match on or NULL to match on all interfaces.

[nullable]

member

D-Bus signal name to match on or NULL to match on all signals.

[nullable]

object_path

object path to match on or NULL to match on all object paths.

[nullable]

arg0

contents of first string argument to match on or NULL to match on all kinds of arguments.

[nullable]

flags

GDBusSignalFlags describing how arg0 is used in subscribing to the signal

 

callback

callback to invoke when there is a signal matching the requested data

 

user_data

user data to pass to callback

 

user_data_free_func

function to free user_data with when subscription is removed or NULL.

[nullable]

Returns

a subscription identifier that can be used with g_dbus_connection_signal_unsubscribe()

Since: 2.26


g_dbus_connection_signal_unsubscribe ()

void
g_dbus_connection_signal_unsubscribe (GDBusConnection *connection,
                                      guint subscription_id);

Unsubscribes from signals.

Parameters

connection

a GDBusConnection

 

subscription_id

a subscription id obtained from g_dbus_connection_signal_subscribe()

 

Since: 2.26


g_dbus_connection_send_message ()

gboolean
g_dbus_connection_send_message (GDBusConnection *connection,
                                GDBusMessage *message,
                                GDBusSendMessageFlags flags,
                                volatile guint32 *out_serial,
                                GError **error);

Asynchronously sends message to the peer represented by connection .

Unless flags contain the G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number will be assigned by connection and set on message via g_dbus_message_set_serial(). If out_serial is not NULL, then the serial number used will be written to this location prior to submitting the message to the underlying transport.

If connection is closed then the operation will fail with G_IO_ERROR_CLOSED. If message is not well-formed, the operation fails with G_IO_ERROR_INVALID_ARGUMENT.

See this server and client for an example of how to use this low-level API to send and receive UNIX file descriptors.

Note that message must be unlocked, unless flags contain the G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.

Parameters

connection

a GDBusConnection

 

message

a GDBusMessage

 

flags

flags affecting how the message is sent

 

out_serial

return location for serial number assigned to message when sending it or NULL.

[out][optional]

error

Return location for error or NULL

 

Returns

TRUE if the message was well-formed and queued for transmission, FALSE if error is set

Since: 2.26


g_dbus_connection_send_message_with_reply ()

void
g_dbus_connection_send_message_with_reply
                               (GDBusConnection *connection,
                                GDBusMessage *message,
                                GDBusSendMessageFlags flags,
                                gint timeout_msec,
                                volatile guint32 *out_serial,
                                GCancellable *cancellable,
                                GAsyncReadyCallback callback,
                                gpointer user_data);

Asynchronously sends message to the peer represented by connection .

Unless flags contain the G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number will be assigned by connection and set on message via g_dbus_message_set_serial(). If out_serial is not NULL, then the serial number used will be written to this location prior to submitting the message to the underlying transport.

If connection is closed then the operation will fail with G_IO_ERROR_CLOSED. If cancellable is canceled, the operation will fail with G_IO_ERROR_CANCELLED. If message is not well-formed, the operation fails with G_IO_ERROR_INVALID_ARGUMENT.

This is an asynchronous method. When the operation is finished, callback will be invoked in the thread-default main context of the thread you are calling this method from. You can then call g_dbus_connection_send_message_with_reply_finish() to get the result of the operation. See g_dbus_connection_send_message_with_reply_sync() for the synchronous version.

Note that message must be unlocked, unless flags contain the G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.

See this server and client for an example of how to use this low-level API to send and receive UNIX file descriptors.

Parameters

connection

a GDBusConnection

 

message

a GDBusMessage

 

flags

flags affecting how the message is sent

 

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

 

out_serial

return location for serial number assigned to message when sending it or NULL.

[out][optional]

cancellable

a GCancellable or NULL.

[nullable]

callback

a GAsyncReadyCallback to call when the request is satisfied or NULL if you don't care about the result.

[nullable]

user_data

The data to pass to callback

 

Since: 2.26


g_dbus_connection_send_message_with_reply_finish ()

GDBusMessage *
g_dbus_connection_send_message_with_reply_finish
                               (GDBusConnection *connection,
                                GAsyncResult *res,
                                GError **error);

Finishes an operation started with g_dbus_connection_send_message_with_reply().

Note that error is only set if a local in-process error occurred. That is to say that the returned GDBusMessage object may be of type G_DBUS_MESSAGE_TYPE_ERROR. Use g_dbus_message_to_gerror() to transcode this to a GError.

See this server and client for an example of how to use this low-level API to send and receive UNIX file descriptors.

Parameters

connection

a GDBusConnection

 

res

a GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_send_message_with_reply()

 

error

teturn location for error or NULL

 

Returns

a locked GDBusMessage or NULL if error is set.

[transfer full]

Since: 2.26


g_dbus_connection_send_message_with_reply_sync ()

GDBusMessage *
g_dbus_connection_send_message_with_reply_sync
                               (GDBusConnection *connection,
                                GDBusMessage *message,
                                GDBusSendMessageFlags flags,
                                gint timeout_msec,
                                volatile guint32 *out_serial,
                                GCancellable *cancellable,
                                GError **error);

Synchronously sends message to the peer represented by connection and blocks the calling thread until a reply is received or the timeout is reached. See g_dbus_connection_send_message_with_reply() for the asynchronous version of this method.

Unless flags contain the G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number will be assigned by connection and set on message via g_dbus_message_set_serial(). If out_serial is not NULL, then the serial number used will be written to this location prior to submitting the message to the underlying transport.

If connection is closed then the operation will fail with G_IO_ERROR_CLOSED. If cancellable is canceled, the operation will fail with G_IO_ERROR_CANCELLED. If message is not well-formed, the operation fails with G_IO_ERROR_INVALID_ARGUMENT.

Note that error is only set if a local in-process error occurred. That is to say that the returned GDBusMessage object may be of type G_DBUS_MESSAGE_TYPE_ERROR. Use g_dbus_message_to_gerror() to transcode this to a GError.

See this server and client for an example of how to use this low-level API to send and receive UNIX file descriptors.

Note that message must be unlocked, unless flags contain the G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.

Parameters

connection

a GDBusConnection

 

message

a GDBusMessage

 

flags

flags affecting how the message is sent.

 

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

 

out_serial

return location for serial number assigned to message when sending it or NULL.

[out][optional]

cancellable

a GCancellable or NULL.

[nullable]

error

return location for error or NULL

 

Returns

a locked GDBusMessage that is the reply to message or NULL if error is set.

[transfer full]

Since: 2.26


GDBusMessageFilterFunction ()

GDBusMessage *
(*GDBusMessageFilterFunction) (GDBusConnection *connection,
                               GDBusMessage *message,
                               gboolean incoming,
                               gpointer user_data);

Signature for function used in g_dbus_connection_add_filter().

A filter function is passed a GDBusMessage and expected to return a GDBusMessage too. Passive filter functions that don't modify the message can simply return the message object:

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static GDBusMessage *
passive_filter (GDBusConnection *connection
                GDBusMessage    *message,
                gboolean         incoming,
                gpointer         user_data)
{
  /<!-- -->* inspect @message *<!-- -->/
  return message;
}

Filter functions that wants to drop a message can simply return NULL:

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static GDBusMessage *
drop_filter (GDBusConnection *connection
             GDBusMessage    *message,
             gboolean         incoming,
             gpointer         user_data)
{
  if (should_drop_message)
    {
      g_object_unref (message);
      message = NULL;
    }
  return message;
}

Finally, a filter function may modify a message by copying it:

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static GDBusMessage *
modifying_filter (GDBusConnection *connection
                  GDBusMessage    *message,
                  gboolean         incoming,
                  gpointer         user_data)
{
  GDBusMessage *copy;
  GError *error;

  error = NULL;
  copy = g_dbus_message_copy (message, &error);
  /<!-- -->* handle @error being is set *<!-- -->/
  g_object_unref (message);

  /<!-- -->* modify @copy *<!-- -->/

  return copy;
}

If the returned GDBusMessage is different from message and cannot be sent on connection (it could use features, such as file descriptors, not compatible with connection ), then a warning is logged to standard error. Applications can check this ahead of time using g_dbus_message_to_blob() passing a GDBusCapabilityFlags value obtained from connection .

Parameters

connection

A GDBusConnection.

[transfer none]

message

A locked GDBusMessage that the filter function takes ownership of.

[transfer full]

incoming

TRUE if it is a message received from the other peer, FALSE if it is a message to be sent to the other peer.

 

user_data

User data passed when adding the filter.

 

Returns

A GDBusMessage that will be freed with g_object_unref() or NULL to drop the message. Passive filter functions can simply return the passed message object.

[transfer full][nullable]

Since: 2.26


g_dbus_connection_add_filter ()

guint
g_dbus_connection_add_filter (GDBusConnection *connection,
                              GDBusMessageFilterFunction filter_function,
                              gpointer user_data,
                              GDestroyNotify user_data_free_func);

Adds a message filter. Filters are handlers that are run on all incoming and outgoing messages, prior to standard dispatch. Filters are run in the order that they were added. The same handler can be added as a filter more than once, in which case it will be run more than once. Filters added during a filter callback won't be run on the message being processed. Filter functions are allowed to modify and even drop messages.

Note that filters are run in a dedicated message handling thread so they can't block and, generally, can't do anything but signal a worker thread. Also note that filters are rarely needed - use API such as g_dbus_connection_send_message_with_reply(), g_dbus_connection_signal_subscribe() or g_dbus_connection_call() instead.

If a filter consumes an incoming message the message is not dispatched anywhere else - not even the standard dispatch machinery (that API such as g_dbus_connection_signal_subscribe() and g_dbus_connection_send_message_with_reply() relies on) will see the message. Similary, if a filter consumes an outgoing message, the message will not be sent to the other peer.

If user_data_free_func is non-NULL, it will be called (in the thread-default main context of the thread you are calling this method from) at some point after user_data is no longer needed. (It is not guaranteed to be called synchronously when the filter is removed, and may be called after connection has been destroyed.)

Parameters

connection

a GDBusConnection

 

filter_function

a filter function

 

user_data

user data to pass to filter_function

 

user_data_free_func

function to free user_data with when filter is removed or NULL

 

Returns

a filter identifier that can be used with g_dbus_connection_remove_filter()

Since: 2.26


g_dbus_connection_remove_filter ()

void
g_dbus_connection_remove_filter (GDBusConnection *connection,
                                 guint filter_id);

Removes a filter.

Note that since filters run in a different thread, there is a race condition where it is possible that the filter will be running even after calling g_dbus_connection_remove_filter(), so you cannot just free data that the filter might be using. Instead, you should pass a GDestroyNotify to g_dbus_connection_add_filter(), which will be called when it is guaranteed that the data is no longer needed.

Parameters

connection

a GDBusConnection

 

filter_id

an identifier obtained from g_dbus_connection_add_filter()

 

Since: 2.26


GDBusInterfaceMethodCallFunc ()

void
(*GDBusInterfaceMethodCallFunc) (GDBusConnection *connection,
                                 const gchar *sender,
                                 const gchar *object_path,
                                 const gchar *interface_name,
                                 const gchar *method_name,
                                 GVariant *parameters,
                                 GDBusMethodInvocation *invocation,
                                 gpointer user_data);

The type of the method_call function in GDBusInterfaceVTable.

Parameters

connection

A GDBusConnection.

 

sender

The unique bus name of the remote caller.

 

object_path

The object path that the method was invoked on.

 

interface_name

The D-Bus interface name the method was invoked on.

 

method_name

The name of the method that was invoked.

 

parameters

A GVariant tuple with parameters.

 

invocation

A GDBusMethodInvocation object that must be used to return a value or error.

[transfer full]

user_data

The user_data gpointer passed to g_dbus_connection_register_object().

 

Since: 2.26


GDBusInterfaceGetPropertyFunc ()

GVariant *
(*GDBusInterfaceGetPropertyFunc) (GDBusConnection *connection,
                                  const gchar *sender,
                                  const gchar *object_path,
                                  const gchar *interface_name,
                                  const gchar *property_name,
                                  GError **error,
                                  gpointer user_data);

The type of the get_property function in GDBusInterfaceVTable.

Parameters

connection

A GDBusConnection.

 

sender

The unique bus name of the remote caller.

 

object_path

The object path that the method was invoked on.

 

interface_name

The D-Bus interface name for the property.

 

property_name

The name of the property to get the value of.

 

error

Return location for error.

 

user_data

The user_data gpointer passed to g_dbus_connection_register_object().

 

Returns

A GVariant with the value for property_name or NULL if error is set. If the returned GVariant is floating, it is consumed - otherwise its reference count is decreased by one.

Since: 2.26


GDBusInterfaceSetPropertyFunc ()

gboolean
(*GDBusInterfaceSetPropertyFunc) (GDBusConnection *connection,
                                  const gchar *sender,
                                  const gchar *object_path,
                                  const gchar *interface_name,
                                  const gchar *property_name,
                                  GVariant *value,
                                  GError **error,
                                  gpointer user_data);

The type of the set_property function in GDBusInterfaceVTable.

Parameters

connection

A GDBusConnection.

 

sender

The unique bus name of the remote caller.

 

object_path

The object path that the method was invoked on.

 

interface_name

The D-Bus interface name for the property.

 

property_name

The name of the property to get the value of.

 

value

The value to set the property to.

 

error

Return location for error.

 

user_data

The user_data gpointer passed to g_dbus_connection_register_object().

 

Returns

TRUE if the property was set to value , FALSE if error is set.

Since: 2.26


g_dbus_connection_register_object ()

guint
g_dbus_connection_register_object (GDBusConnection *connection,
                                   const gchar *object_path,
                                   GDBusInterfaceInfo *interface_info,
                                   const GDBusInterfaceVTable *vtable,
                                   gpointer user_data,
                                   GDestroyNotify user_data_free_func,
                                   GError **error);

Registers callbacks for exported objects at object_path with the D-Bus interface that is described in interface_info .

Calls to functions in vtable (and user_data_free_func ) will happen in the thread-default main context of the thread you are calling this method from.

Note that all GVariant values passed to functions in vtable will match the signature given in interface_info - if a remote caller passes incorrect values, the org.freedesktop.DBus.Error.InvalidArgs is returned to the remote caller.

Additionally, if the remote caller attempts to invoke methods or access properties not mentioned in interface_info the org.freedesktop.DBus.Error.UnknownMethod resp. org.freedesktop.DBus.Error.InvalidArgs errors are returned to the caller.

It is considered a programming error if the GDBusInterfaceGetPropertyFunc function in vtable returns a GVariant of incorrect type.

If an existing callback is already registered at object_path and interface_name , then error is set to G_IO_ERROR_EXISTS.

GDBus automatically implements the standard D-Bus interfaces org.freedesktop.DBus.Properties, org.freedesktop.DBus.Introspectable and org.freedesktop.Peer, so you don't have to implement those for the objects you export. You can implement org.freedesktop.DBus.Properties yourself, e.g. to handle getting and setting of properties asynchronously.

Note that the reference count on interface_info will be incremented by 1 (unless allocated statically, e.g. if the reference count is -1, see g_dbus_interface_info_ref()) for as long as the object is exported. Also note that vtable will be copied.

See this server for an example of how to use this method.

Parameters

connection

a GDBusConnection

 

object_path

the object path to register at

 

interface_info

introspection data for the interface

 

vtable

a GDBusInterfaceVTable to call into or NULL.

[nullable]

user_data

data to pass to functions in vtable .

[nullable]

user_data_free_func

function to call when the object path is unregistered

 

error

return location for error or NULL

 

Returns

0 if error is set, otherwise a registration id (never 0) that can be used with g_dbus_connection_unregister_object()

Since: 2.26


g_dbus_connection_unregister_object ()

gboolean
g_dbus_connection_unregister_object (GDBusConnection *connection,
                                     guint registration_id);

Unregisters an object.

Parameters

connection

a GDBusConnection

 

registration_id

a registration id obtained from g_dbus_connection_register_object()

 

Returns

TRUE if the object was unregistered, FALSE otherwise

Since: 2.26


g_dbus_connection_register_object_with_closures ()

guint
g_dbus_connection_register_object_with_closures
                               (GDBusConnection *connection,
                                const gchar *object_path,
                                GDBusInterfaceInfo *interface_info,
                                GClosure *method_call_closure,
                                GClosure *get_property_closure,
                                GClosure *set_property_closure,
                                GError **error);

Version of g_dbus_connection_register_object() using closures instead of a GDBusInterfaceVTable for easier binding in other languages.

[rename-to g_dbus_connection_register_object]

Parameters

connection

A GDBusConnection.

 

object_path

The object path to register at.

 

interface_info

Introspection data for the interface.

 

method_call_closure

GClosure for handling incoming method calls.

[nullable]

get_property_closure

GClosure for getting a property.

[nullable]

set_property_closure

GClosure for setting a property.

[nullable]

error

Return location for error or NULL.

 

Returns

0 if error is set, otherwise a registration id (never 0) that can be used with g_dbus_connection_unregister_object() .

Since: 2.46


GDBusSubtreeEnumerateFunc ()

gchar **
(*GDBusSubtreeEnumerateFunc) (GDBusConnection *connection,
                              const gchar *sender,
                              const gchar *object_path,
                              gpointer user_data);

The type of the enumerate function in GDBusSubtreeVTable.

This function is called when generating introspection data and also when preparing to dispatch incoming messages in the event that the G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES flag is not specified (ie: to verify that the object path is valid).

Hierarchies are not supported; the items that you return should not contain the '/' character.

The return value will be freed with g_strfreev().

Parameters

connection

A GDBusConnection.

 

sender

The unique bus name of the remote caller.

 

object_path

The object path that was registered with g_dbus_connection_register_subtree().

 

user_data

The user_data gpointer passed to g_dbus_connection_register_subtree().

 

Returns

A newly allocated array of strings for node names that are children of object_path .

Since: 2.26


GDBusSubtreeIntrospectFunc ()

GDBusInterfaceInfo **
(*GDBusSubtreeIntrospectFunc) (GDBusConnection *connection,
                               const gchar *sender,
                               const gchar *object_path,
                               const gchar *node,
                               gpointer user_data);

The type of the introspect function in GDBusSubtreeVTable.

Subtrees are flat. node , if non-NULL, is always exactly one segment of the object path (ie: it never contains a slash).

This function should return NULL to indicate that there is no object at this node.

If this function returns non-NULL, the return value is expected to be a NULL-terminated array of pointers to GDBusInterfaceInfo structures describing the interfaces implemented by node . This array will have g_dbus_interface_info_unref() called on each item before being freed with g_free().

The difference between returning NULL and an array containing zero items is that the standard DBus interfaces will returned to the remote introspector in the empty array case, but not in the NULL case.

Parameters

connection

A GDBusConnection.

 

sender

The unique bus name of the remote caller.

 

object_path

The object path that was registered with g_dbus_connection_register_subtree().

 

node

A node that is a child of object_path (relative to object_path ) or NULL for the root of the subtree.

 

user_data

The user_data gpointer passed to g_dbus_connection_register_subtree().

 

Returns

A NULL-terminated array of pointers to GDBusInterfaceInfo, or NULL.

Since: 2.26


GDBusSubtreeDispatchFunc ()

const GDBusInterfaceVTable *
(*GDBusSubtreeDispatchFunc) (GDBusConnection *connection,
                             const gchar *sender,
                             const gchar *object_path,
                             const gchar *interface_name,
                             const gchar *node,
                             gpointer *out_user_data,
                             gpointer user_data);

The type of the dispatch function in GDBusSubtreeVTable.

Subtrees are flat. node , if non-NULL, is always exactly one segment of the object path (ie: it never contains a slash).

Parameters

connection

A GDBusConnection.

 

sender

The unique bus name of the remote caller.

 

object_path

The object path that was registered with g_dbus_connection_register_subtree().

 

interface_name

The D-Bus interface name that the method call or property access is for.

 

node

A node that is a child of object_path (relative to object_path ) or NULL for the root of the subtree.

 

out_user_data

Return location for user data to pass to functions in the returned GDBusInterfaceVTable (never NULL).

[nullable][not optional]

user_data

The user_data gpointer passed to g_dbus_connection_register_subtree().

 

Returns

A GDBusInterfaceVTable or NULL if you don't want to handle the methods.

Since: 2.26


g_dbus_connection_register_subtree ()

guint
g_dbus_connection_register_subtree (GDBusConnection *connection,
                                    const gchar *object_path,
                                    const GDBusSubtreeVTable *vtable,
                                    GDBusSubtreeFlags flags,
                                    gpointer user_data,
                                    GDestroyNotify user_data_free_func,
                                    GError **error);

Registers a whole subtree of dynamic objects.

The enumerate and introspection functions in vtable are used to convey, to remote callers, what nodes exist in the subtree rooted by object_path .

When handling remote calls into any node in the subtree, first the enumerate function is used to check if the node exists. If the node exists or the G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES flag is set the introspection function is used to check if the node supports the requested method. If so, the dispatch function is used to determine where to dispatch the call. The collected GDBusInterfaceVTable and gpointer will be used to call into the interface vtable for processing the request.

All calls into user-provided code will be invoked in the thread-default main context of the thread you are calling this method from.

If an existing subtree is already registered at object_path or then error is set to G_IO_ERROR_EXISTS.

Note that it is valid to register regular objects (using g_dbus_connection_register_object()) in a subtree registered with g_dbus_connection_register_subtree() - if so, the subtree handler is tried as the last resort. One way to think about a subtree handler is to consider it a fallback handler for object paths not registered via g_dbus_connection_register_object() or other bindings.

Note that vtable will be copied so you cannot change it after registration.

See this server for an example of how to use this method.

Parameters

connection

a GDBusConnection

 

object_path

the object path to register the subtree at

 

vtable

a GDBusSubtreeVTable to enumerate, introspect and dispatch nodes in the subtree

 

flags

flags used to fine tune the behavior of the subtree

 

user_data

data to pass to functions in vtable

 

user_data_free_func

function to call when the subtree is unregistered

 

error

return location for error or NULL

 

Returns

0 if error is set, otherwise a subtree registration id (never 0) that can be used with g_dbus_connection_unregister_subtree() .

Since: 2.26


g_dbus_connection_unregister_subtree ()

gboolean
g_dbus_connection_unregister_subtree (GDBusConnection *connection,
                                      guint registration_id);

Unregisters a subtree.

Parameters

connection

a GDBusConnection

 

registration_id

a subtree registration id obtained from g_dbus_connection_register_subtree()

 

Returns

TRUE if the subtree was unregistered, FALSE otherwise

Since: 2.26

Types and Values

enum GBusType

An enumeration for well-known message buses.

Members

G_BUS_TYPE_STARTER

An alias for the message bus that activated the process, if any.

 

G_BUS_TYPE_NONE

Not a message bus.

 

G_BUS_TYPE_SYSTEM

The system-wide message bus.

 

G_BUS_TYPE_SESSION

The login session message bus.

 

Since: 2.26


GDBusConnection

typedef struct _GDBusConnection GDBusConnection;

The GDBusConnection structure contains only private data and should only be accessed using the provided API.

Since: 2.26


enum GDBusConnectionFlags

Flags used when creating a new GDBusConnection.

Members

G_DBUS_CONNECTION_FLAGS_NONE

No flags set.

 

G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT

Perform authentication against server.

 

G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER

Perform authentication against client.

 

G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS

When authenticating as a server, allow the anonymous authentication method.

 

G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION

Pass this flag if connecting to a peer that is a message bus. This means that the Hello() method will be invoked as part of the connection setup.

 

G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING

If set, processing of D-Bus messages is delayed until g_dbus_connection_start_message_processing() is called.

 

Since: 2.26


enum GDBusCapabilityFlags

Capabilities negotiated with the remote peer.

Members

G_DBUS_CAPABILITY_FLAGS_NONE

No flags set.

 

G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING

The connection supports exchanging UNIX file descriptors with the remote peer.

 

Since: 2.26


enum GDBusCallFlags

Flags used in g_dbus_connection_call() and similar APIs.

Members

G_DBUS_CALL_FLAGS_NONE

No flags set.

 

G_DBUS_CALL_FLAGS_NO_AUTO_START

The bus must not launch an owner for the destination name in response to this method invocation.

 

G_DBUS_CALL_FLAGS_ALLOW_INTERACTIVE_AUTHORIZATION

the caller is prepared to wait for interactive authorization. Since 2.46.

 

Since: 2.26


enum GDBusSignalFlags

Flags used when subscribing to signals via g_dbus_connection_signal_subscribe().

Members

G_DBUS_SIGNAL_FLAGS_NONE

No flags set.

 

G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE

Don't actually send the AddMatch D-Bus call for this signal subscription. This gives you more control over which match rules you add (but you must add them manually).

 

G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_NAMESPACE

Match first arguments that contain a bus or interface name with the given namespace.

 

G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_PATH

Match first arguments that contain an object path that is either equivalent to the given path, or one of the paths is a subpath of the other.

 

Since: 2.26


enum GDBusSendMessageFlags

Flags used when sending GDBusMessages on a GDBusConnection.

Members

G_DBUS_SEND_MESSAGE_FLAGS_NONE

No flags set.

 

G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL

Do not automatically assign a serial number from the GDBusConnection object when sending a message.

 

Since: 2.26


GDBusInterfaceVTable

typedef struct {
  GDBusInterfaceMethodCallFunc  method_call;
  GDBusInterfaceGetPropertyFunc get_property;
  GDBusInterfaceSetPropertyFunc set_property;
} GDBusInterfaceVTable;

Virtual table for handling properties and method calls for a D-Bus interface.

Since 2.38, if you want to handle getting/setting D-Bus properties asynchronously, give NULL as your get_property() or set_property() function. The D-Bus call will be directed to your method_call function, with the provided interface_name set to "org.freedesktop.DBus.Properties".

Ownership of the GDBusMethodInvocation object passed to the method_call() function is transferred to your handler; you must call one of the methods of GDBusMethodInvocation to return a reply (possibly empty), or an error. These functions also take ownership of the passed-in invocation object, so unless the invocation object has otherwise been referenced, it will be then be freed. Calling one of these functions may be done within your method_call() implementation but it also can be done at a later point to handle the method asynchronously.

The usual checks on the validity of the calls is performed. For Get calls, an error is automatically returned if the property does not exist or the permissions do not allow access. The same checks are performed for Set calls, and the provided value is also checked for being the correct type.

For both Get and Set calls, the GDBusMethodInvocation passed to the method_call handler can be queried with g_dbus_method_invocation_get_property_info() to get a pointer to the GDBusPropertyInfo of the property.

If you have readable properties specified in your interface info, you must ensure that you either provide a non-NULL get_property() function or provide implementations of both the Get and GetAll methods on org.freedesktop.DBus.Properties interface in your method_call function. Note that the required return type of the Get call is (v), not the type of the property. GetAll expects a return value of type a{sv}.

If you have writable properties specified in your interface info, you must ensure that you either provide a non-NULL set_property() function or provide an implementation of the Set call. If implementing the call, you must return the value of type G_VARIANT_TYPE_UNIT.

Members

GDBusInterfaceMethodCallFunc method_call;

Function for handling incoming method calls.

 

GDBusInterfaceGetPropertyFunc get_property;

Function for getting a property.

 

GDBusInterfaceSetPropertyFunc set_property;

Function for setting a property.

 

Since: 2.26


GDBusSubtreeVTable

typedef struct {
  GDBusSubtreeEnumerateFunc  enumerate;
  GDBusSubtreeIntrospectFunc introspect;
  GDBusSubtreeDispatchFunc   dispatch;
} GDBusSubtreeVTable;

Virtual table for handling subtrees registered with g_dbus_connection_register_subtree().

Members

GDBusSubtreeEnumerateFunc enumerate;

Function for enumerating child nodes.

 

GDBusSubtreeIntrospectFunc introspect;

Function for introspecting a child node.

 

GDBusSubtreeDispatchFunc dispatch;

Function for dispatching a remote call on a child node.

 

Since: 2.26


enum GDBusSubtreeFlags

Flags passed to g_dbus_connection_register_subtree().

Members

G_DBUS_SUBTREE_FLAGS_NONE

No flags set.

 

G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES

Method calls to objects not in the enumerated range will still be dispatched. This is useful if you want to dynamically spawn objects in the subtree.

 

Since: 2.26

Property Details

The “address” property

  “address”                  gchar *

A D-Bus address specifying potential endpoints that can be used when establishing the connection.

Flags: Write / Construct Only

Default value: NULL

Since: 2.26


The “authentication-observer” property

  “authentication-observer”  GDBusAuthObserver *

A GDBusAuthObserver object to assist in the authentication process or NULL.

Flags: Write / Construct Only

Since: 2.26


The “capabilities” property

  “capabilities”             GDBusCapabilityFlags

Flags from the GDBusCapabilityFlags enumeration representing connection features negotiated with the other peer.

Flags: Read

Since: 2.26


The “closed” property

  “closed”                   gboolean

A boolean specifying whether the connection has been closed.

Flags: Read

Default value: FALSE

Since: 2.26


The “exit-on-close” property

  “exit-on-close”            gboolean

A boolean specifying whether the process will be terminated (by calling raise(SIGTERM)) if the connection is closed by the remote peer.

Note that GDBusConnection objects returned by g_bus_get_finish() and g_bus_get_sync() will (usually) have this property set to TRUE.

Flags: Read / Write

Default value: FALSE

Since: 2.26


The “flags” property

  “flags”                    GDBusConnectionFlags

Flags from the GDBusConnectionFlags enumeration.

Flags: Write / Construct Only

Since: 2.26


The “guid” property

  “guid”                     gchar *

The GUID of the peer performing the role of server when authenticating.

If you are constructing a GDBusConnection and pass G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER in the “flags” property then you MUST also set this property to a valid guid.

If you are constructing a GDBusConnection and pass G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT in the “flags” property you will be able to read the GUID of the other peer here after the connection has been successfully initialized.

Flags: Read / Write / Construct Only

Default value: NULL

Since: 2.26


The “stream” property

  “stream”                   GIOStream *

The underlying GIOStream used for I/O.

If this is passed on construction and is a GSocketConnection, then the corresponding GSocket will be put into non-blocking mode.

While the GDBusConnection is active, it will interact with this stream from a worker thread, so it is not safe to interact with the stream directly.

Flags: Read / Write / Construct Only

Since: 2.26


The “unique-name” property

  “unique-name”              gchar *

The unique name as assigned by the message bus or NULL if the connection is not open or not a message bus connection.

Flags: Read

Default value: NULL

Since: 2.26

Signal Details

The “closed” signal

void
user_function (GDBusConnection *connection,
               gboolean         remote_peer_vanished,
               GError          *error,
               gpointer         user_data)

Emitted when the connection is closed.

The cause of this event can be

  • If g_dbus_connection_close() is called. In this case remote_peer_vanished is set to FALSE and error is NULL.

  • If the remote peer closes the connection. In this case remote_peer_vanished is set to TRUE and error is set.

  • If the remote peer sends invalid or malformed data. In this case remote_peer_vanished is set to FALSE and error is set.

Upon receiving this signal, you should give up your reference to connection . You are guaranteed that this signal is emitted only once.

Parameters

connection

the GDBusConnection emitting the signal

 

remote_peer_vanished

TRUE if connection is closed because the remote peer closed its end of the connection

 

error

a GError with more details about the event or NULL.

[nullable]

user_data

user data set when the signal handler was connected.

 

Flags: Run Last

Since: 2.26

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