D-Bus  1.8.1
Typedefs | Functions

Server that listens for new connections. More...

Typedefs

typedef struct DBusServer DBusServer
 An opaque object representing a server that listens for connections from other applications. More...
 
typedef void(* DBusNewConnectionFunction )(DBusServer *server, DBusConnection *new_connection, void *data)
 Called when a new connection to the server is available. More...
 

Functions

DBusServerdbus_server_listen (const char *address, DBusError *error)
 Listens for new connections on the given address. More...
 
DBusServerdbus_server_ref (DBusServer *server)
 Increments the reference count of a DBusServer. More...
 
void dbus_server_unref (DBusServer *server)
 Decrements the reference count of a DBusServer. More...
 
void dbus_server_disconnect (DBusServer *server)
 Releases the server's address and stops listening for new clients. More...
 
dbus_bool_t dbus_server_get_is_connected (DBusServer *server)
 Returns TRUE if the server is still listening for new connections. More...
 
char * dbus_server_get_address (DBusServer *server)
 Returns the address of the server, as a newly-allocated string which must be freed by the caller. More...
 
char * dbus_server_get_id (DBusServer *server)
 Returns the unique ID of the server, as a newly-allocated string which must be freed by the caller. More...
 
void dbus_server_set_new_connection_function (DBusServer *server, DBusNewConnectionFunction function, void *data, DBusFreeFunction free_data_function)
 Sets a function to be used for handling new connections. More...
 
dbus_bool_t dbus_server_set_watch_functions (DBusServer *server, DBusAddWatchFunction add_function, DBusRemoveWatchFunction remove_function, DBusWatchToggledFunction toggled_function, void *data, DBusFreeFunction free_data_function)
 Sets the watch functions for the server. More...
 
dbus_bool_t dbus_server_set_timeout_functions (DBusServer *server, DBusAddTimeoutFunction add_function, DBusRemoveTimeoutFunction remove_function, DBusTimeoutToggledFunction toggled_function, void *data, DBusFreeFunction free_data_function)
 Sets the timeout functions for the server. More...
 
dbus_bool_t dbus_server_set_auth_mechanisms (DBusServer *server, const char **mechanisms)
 Sets the authentication mechanisms that this server offers to clients, as a NULL-terminated array of mechanism names. More...
 
dbus_bool_t dbus_server_allocate_data_slot (dbus_int32_t *slot_p)
 Allocates an integer ID to be used for storing application-specific data on any DBusServer. More...
 
void dbus_server_free_data_slot (dbus_int32_t *slot_p)
 Deallocates a global ID for server data slots. More...
 
dbus_bool_t dbus_server_set_data (DBusServer *server, int slot, void *data, DBusFreeFunction free_data_func)
 Stores a pointer on a DBusServer, along with an optional function to be used for freeing the data when the data is set again, or when the server is finalized. More...
 
void * dbus_server_get_data (DBusServer *server, int slot)
 Retrieves data previously set with dbus_server_set_data(). More...
 

Detailed Description

Server that listens for new connections.

A DBusServer represents a server that other applications can connect to. Each connection from another application is represented by a DBusConnection.

Todo:

Thread safety hasn't been tested much for DBusServer

Need notification to apps of disconnection, may matter for some transports

Typedef Documentation

typedef void(* DBusNewConnectionFunction)(DBusServer *server, DBusConnection *new_connection, void *data)

Called when a new connection to the server is available.

Must reference and save the new connection, or close the new connection. Set with dbus_server_set_new_connection_function().

Definition at line 47 of file dbus-server.h.

An opaque object representing a server that listens for connections from other applications.

Each time a connection is made, a new DBusConnection is created and made available via an application-provided DBusNewConnectionFunction. The DBusNewConnectionFunction is provided with dbus_server_set_new_connection_function().

Definition at line 42 of file dbus-server.h.

Function Documentation

DBUS_EXPORT dbus_bool_t dbus_server_allocate_data_slot ( dbus_int32_t *  slot_p)

Allocates an integer ID to be used for storing application-specific data on any DBusServer.

The allocated ID may then be used with dbus_server_set_data() and dbus_server_get_data(). The slot must be initialized with -1. If a nonnegative slot is passed in, the refcount is incremented on that slot, rather than creating a new slot.

The allocated slot is global, i.e. all DBusServer objects will have a slot with the given integer ID reserved.

Parameters
slot_paddress of global variable storing the slot ID
Returns
FALSE on no memory

Definition at line 1086 of file dbus-server.c.

References _dbus_data_slot_allocator_alloc().

DBUS_EXPORT void dbus_server_disconnect ( DBusServer server)

Releases the server's address and stops listening for new clients.

If called more than once, only the first call has an effect. Does not modify the server's reference count.

Parameters
serverthe server.

Definition at line 779 of file dbus-server.c.

References _dbus_assert, dbus_server_ref(), dbus_server_unref(), DBusServerVTable::disconnect, disconnected, NULL, TRUE, and vtable.

DBUS_EXPORT void dbus_server_free_data_slot ( dbus_int32_t *  slot_p)

Deallocates a global ID for server data slots.

dbus_server_get_data() and dbus_server_set_data() may no longer be used with this slot. Existing data stored on existing DBusServer objects will be freed when the server is finalized, but may not be retrieved (and may only be replaced if someone else reallocates the slot).

Parameters
slot_paddress of the slot to deallocate

Definition at line 1104 of file dbus-server.c.

References _dbus_data_slot_allocator_free().

DBUS_EXPORT char * dbus_server_get_address ( DBusServer server)

Returns the address of the server, as a newly-allocated string which must be freed by the caller.

Parameters
serverthe server
Returns
the address or NULL if no memory

Definition at line 827 of file dbus-server.c.

References _dbus_strdup(), address, and NULL.

DBUS_EXPORT void * dbus_server_get_data ( DBusServer server,
int  slot 
)

Retrieves data previously set with dbus_server_set_data().

The slot must still be allocated (must not have been freed).

Parameters
serverthe server
slotthe slot to get data from
Returns
the data, or NULL if not found

Definition at line 1165 of file dbus-server.c.

References _dbus_data_slot_list_get(), NULL, and slot_list.

DBUS_EXPORT char * dbus_server_get_id ( DBusServer server)

Returns the unique ID of the server, as a newly-allocated string which must be freed by the caller.

This ID is normally used by clients to tell when two DBusConnection would be equivalent (because the server address passed to dbus_connection_open() will have the same guid in the two cases). dbus_connection_open() can re-use an existing connection with the same ID instead of opening a new connection.

This is an ID unique to each DBusServer. Remember that a DBusServer represents only one mode of connecting, so e.g. a bus daemon can listen on multiple addresses which will mean it has multiple DBusServer each with their own ID.

The ID is not a UUID in the sense of RFC4122; the details are explained in the D-Bus specification.

Parameters
serverthe server
Returns
the id of the server or NULL if no memory

Definition at line 863 of file dbus-server.c.

References _dbus_string_copy_data(), guid_hex, and NULL.

DBUS_EXPORT dbus_bool_t dbus_server_get_is_connected ( DBusServer server)

Returns TRUE if the server is still listening for new connections.

Parameters
serverthe server.

Definition at line 806 of file dbus-server.c.

References disconnected, FALSE, and NULL.

DBUS_EXPORT DBusServer * dbus_server_listen ( const char *  address,
DBusError error 
)

Listens for new connections on the given address.

If there are multiple semicolon-separated address entries in the address, tries each one and listens on the first one that works.

Returns NULL and sets error if listening fails for any reason. Otherwise returns a new DBusServer. dbus_server_set_new_connection_function(), dbus_server_set_watch_functions(), and dbus_server_set_timeout_functions() should be called immediately to render the server fully functional.

To free the server, applications must call first dbus_server_disconnect() and then dbus_server_unref().

Parameters
addressthe address of this server.
errorlocation to store reason for failure.
Returns
a new DBusServer, or NULL on failure.

Definition at line 558 of file dbus-server.c.

References _dbus_assert, _DBUS_N_ELEMENTS, dbus_address_entries_free(), dbus_address_entry_get_method(), DBUS_ERROR_ADDRESS_IN_USE, DBUS_ERROR_BAD_ADDRESS, dbus_error_free(), DBUS_ERROR_INIT, dbus_error_is_set(), dbus_move_error(), dbus_parse_address(), dbus_set_error(), FALSE, NULL, and TRUE.

DBUS_EXPORT DBusServer * dbus_server_ref ( DBusServer server)

Increments the reference count of a DBusServer.

Parameters
serverthe server.
Returns
the server

Definition at line 696 of file dbus-server.c.

References _dbus_atomic_dec(), _dbus_atomic_inc(), _dbus_return_if_fail_warning_format, _dbus_warn_check_failed(), NULL, and refcount.

Referenced by dbus_server_disconnect().

DBUS_EXPORT dbus_bool_t dbus_server_set_auth_mechanisms ( DBusServer server,
const char **  mechanisms 
)

Sets the authentication mechanisms that this server offers to clients, as a NULL-terminated array of mechanism names.

This function only affects connections created after it is called. Pass NULL instead of an array to use all available mechanisms (this is the default behavior).

The D-Bus specification describes some of the supported mechanisms.

Parameters
serverthe server
mechanismsNULL-terminated array of mechanisms
Returns
FALSE if no memory

Definition at line 1042 of file dbus-server.c.

References _dbus_dup_string_array(), auth_mechanisms, dbus_free_string_array(), FALSE, NULL, and TRUE.

DBUS_EXPORT dbus_bool_t dbus_server_set_data ( DBusServer server,
int  slot,
void *  data,
DBusFreeFunction  free_data_func 
)

Stores a pointer on a DBusServer, along with an optional function to be used for freeing the data when the data is set again, or when the server is finalized.

The slot number must have been allocated with dbus_server_allocate_data_slot().

Parameters
serverthe server
slotthe slot number
datathe data to store
free_data_funcfinalizer function for the data
Returns
TRUE if there was enough memory to store the data

Definition at line 1125 of file dbus-server.c.

References _dbus_data_slot_list_set(), FALSE, NULL, and slot_list.

DBUS_EXPORT void dbus_server_set_new_connection_function ( DBusServer server,
DBusNewConnectionFunction  function,
void *  data,
DBusFreeFunction  free_data_function 
)

Sets a function to be used for handling new connections.

The given function is passed each new connection as the connection is created. If the new connection function increments the connection's reference count, the connection will stay alive. Otherwise, the connection will be unreferenced and closed. The new connection function may also close the connection itself, which is considered good form if the connection is not wanted.

The connection here is private in the sense of dbus_connection_open_private(), so if the new connection function keeps a reference it must arrange for the connection to be closed. i.e. libdbus does not own this connection once the new connection function takes a reference.

Parameters
serverthe server.
functiona function to handle new connections.
datadata to pass to the new connection handler.
free_data_functionfunction to free the data.

Definition at line 898 of file dbus-server.c.

References new_connection_data, new_connection_free_data_function, new_connection_function, and NULL.

Referenced by _dbus_server_finalize_base().

DBUS_EXPORT dbus_bool_t dbus_server_set_timeout_functions ( DBusServer server,
DBusAddTimeoutFunction  add_function,
DBusRemoveTimeoutFunction  remove_function,
DBusTimeoutToggledFunction  toggled_function,
void *  data,
DBusFreeFunction  free_data_function 
)

Sets the timeout functions for the server.

These functions are responsible for making the application's main loop aware of timeouts.

This function behaves exactly like dbus_connection_set_timeout_functions(); see the documentation for that routine.

Parameters
serverthe server.
add_functionfunction to add a timeout.
remove_functionfunction to remove a timeout.
toggled_functionfunction to notify when the timeout is enabled/disabled
datadata to pass to add_function and remove_function.
free_data_functionfunction to be called to free the data.
Returns
FALSE on failure (no memory)

Definition at line 991 of file dbus-server.c.

References _dbus_timeout_list_set_functions(), _dbus_warn_check_failed(), FALSE, NULL, and timeouts.

DBUS_EXPORT dbus_bool_t dbus_server_set_watch_functions ( DBusServer server,
DBusAddWatchFunction  add_function,
DBusRemoveWatchFunction  remove_function,
DBusWatchToggledFunction  toggled_function,
void *  data,
DBusFreeFunction  free_data_function 
)

Sets the watch functions for the server.

These functions are responsible for making the application's main loop aware of file descriptors that need to be monitored for events.

This function behaves exactly like dbus_connection_set_watch_functions(); see the documentation for that routine.

Parameters
serverthe server.
add_functionfunction to begin monitoring a new descriptor.
remove_functionfunction to stop monitoring a descriptor.
toggled_functionfunction to notify when the watch is enabled/disabled
datadata to pass to add_function and remove_function.
free_data_functionfunction to be called to free the data.
Returns
FALSE on failure (no memory)

Definition at line 938 of file dbus-server.c.

References _dbus_warn_check_failed(), _dbus_watch_list_set_functions(), FALSE, NULL, and watches.

DBUS_EXPORT void dbus_server_unref ( DBusServer server)

Decrements the reference count of a DBusServer.

Finalizes the server if the reference count reaches zero.

The server must be disconnected before the refcount reaches zero.

Parameters
serverthe server.

Definition at line 729 of file dbus-server.c.

References _dbus_assert, _dbus_atomic_dec(), _dbus_atomic_inc(), _dbus_return_if_fail_warning_format, _dbus_warn_check_failed(), disconnected, DBusServerVTable::finalize, NULL, refcount, and vtable.

Referenced by dbus_server_disconnect().