dbus.bus module

class dbus.bus.BusConnection(*args, **kwargs)

Bases: dbus.connection.Connection

A connection to a D-Bus daemon that implements the org.freedesktop.DBus pseudo-service.

Since:0.81.0
START_REPLY_ALREADY_RUNNING = 2
START_REPLY_SUCCESS = 1
TYPE_SESSION = 0

Represents a session bus (same as the global dbus.BUS_SESSION)

TYPE_STARTER = 2

Represents the bus that started this service by activation (same as the global dbus.BUS_STARTER)

TYPE_SYSTEM = 1

Represents the system bus (same as the global dbus.BUS_SYSTEM)

activate_name_owner(bus_name)

Return the unique name for the given bus name, activating it if necessary and possible.

If the name is already unique or this connection is not to a bus daemon, just return it.

Returns:a bus name. If the given bus_name exists, the returned name identifies its current owner; otherwise the returned name does not exist.
Raises DBusException:
 if the implementation has failed to activate the given bus name.
Since:0.81.0
add_match_string(rule)

Arrange for this application to receive messages on the bus that match the given rule. This version will block.

Parameters:
rule : str

The match rule

Raises DBusExceptionDBusException:
 

on error.

Since:

0.80.0

add_match_string_non_blocking(rule)

Arrange for this application to receive messages on the bus that match the given rule. This version will not block, but any errors will be ignored.

Parameters:
rule : str

The match rule

Raises DBusExceptionDBusException:
 

on error.

Since:

0.80.0

add_signal_receiver(handler_function, signal_name=None, dbus_interface=None, bus_name=None, path=None, **keywords)

Arrange for the given function to be called when a signal matching the parameters is received.

Parameters:
handler_function : callable

The function to be called. Its positional arguments will be the arguments of the signal. By default it will receive no keyword arguments, but see the description of the optional keyword arguments below.

signal_name : str

The signal name; None (the default) matches all names

dbus_interface : str

The D-Bus interface name with which to qualify the signal; None (the default) matches all interface names

bus_name : str

A bus name for the sender, which will be resolved to a unique name if it is not already; None (the default) matches any sender.

path : str

The object path of the object which must have emitted the signal; None (the default) matches any object path

Keywords:
utf8_strings : bool

If True, the handler function will receive any string arguments as dbus.UTF8String objects (a subclass of str guaranteed to be UTF-8). If False (default) it will receive any string arguments as dbus.String objects (a subclass of unicode).

byte_arrays : bool

If True, the handler function will receive any byte-array arguments as dbus.ByteArray objects (a subclass of str). If False (default) it will receive any byte-array arguments as a dbus.Array of dbus.Byte (subclasses of: a list of ints).

sender_keyword : str

If not None (the default), the handler function will receive the unique name of the sending endpoint as a keyword argument with this name.

destination_keyword : str

If not None (the default), the handler function will receive the bus name of the destination (or None if the signal is a broadcast, as is usual) as a keyword argument with this name.

interface_keyword : str

If not None (the default), the handler function will receive the signal interface as a keyword argument with this name.

member_keyword : str

If not None (the default), the handler function will receive the signal name as a keyword argument with this name.

path_keyword : str

If not None (the default), the handler function will receive the object-path of the sending object as a keyword argument with this name.

message_keyword : str

If not None (the default), the handler function will receive the dbus.lowlevel.SignalMessage as a keyword argument with this name.

arg… : unicode or UTF-8 str

If there are additional keyword parameters of the form argn, match only signals where the nth argument is the value given for that keyword parameter. As of this time only string arguments can be matched (in particular, object paths and signatures can’t).

named_service : str

A deprecated alias for bus_name.

get_name_owner(bus_name)

Return the unique connection name of the primary owner of the given name.

Raises DBusExceptionDBusException:
 if the bus_name has no owner
Since:0.81.0
get_object(bus_name, object_path, introspect=True, follow_name_owner_changes=False, **kwargs)

Return a local proxy for the given remote object.

Method calls on the proxy are translated into method calls on the remote object.

Parameters:
bus_name : str

A bus name (either the unique name or a well-known name) of the application owning the object. The keyword argument named_service is a deprecated alias for this.

object_path : str

The object path of the desired object

introspect : bool

If true (default), attempt to introspect the remote object to find out supported methods and their signatures

follow_name_owner_changes : bool

If the object path is a well-known name and this parameter is false (default), resolve the well-known name to the unique name of its current owner and bind to that instead; if the ownership of the well-known name changes in future, keep communicating with the original owner. This is necessary if the D-Bus API used is stateful.

If the object path is a well-known name and this parameter is true, whenever the well-known name changes ownership in future, bind to the new owner, if any.

If the given object path is a unique name, this parameter has no effect.

Returns:

a dbus.proxies.ProxyObject

Raises DBusExceptionDBusException:
 

if resolving the well-known name to a unique name fails

get_unix_user(bus_name)

Get the numeric uid of the process owning the given bus name.

Parameters:
bus_name : str

A bus name, either unique or well-known

Returns:

a dbus.UInt32

Since:

0.80.0

list_activatable_names()

Return a list of all names that can be activated on the bus.

Returns:a dbus.Array of dbus.UTF8String
Since:0.81.0
list_names()

Return a list of all currently-owned names on the bus.

Returns:a dbus.Array of dbus.UTF8String
Since:0.81.0
name_has_owner(bus_name)

Return True iff the given bus name has an owner on this bus.

Parameters:
bus_name : str

The bus name to look up

Returns:

a bool

release_name(name)

Release a bus name.

Parameters:
name : str

The well-known name to be released

Returns:

RELEASE_NAME_REPLY_RELEASED, RELEASE_NAME_REPLY_NON_EXISTENT or RELEASE_NAME_REPLY_NOT_OWNER

Raises DBusExceptionDBusException:
 

if the bus daemon cannot be contacted or returns an error.

remove_match_string(rule)

Arrange for this application to receive messages on the bus that match the given rule. This version will block.

Parameters:
rule : str

The match rule

Raises DBusExceptionDBusException:
 

on error.

Since:

0.80.0

remove_match_string_non_blocking(rule)

Arrange for this application to receive messages on the bus that match the given rule. This version will not block, but any errors will be ignored.

Parameters:
rule : str

The match rule

Raises DBusExceptionDBusException:
 

on error.

Since:

0.80.0

request_name(name, flags=0)

Request a bus name.

Parameters:
name : str

The well-known name to be requested

flags : dbus.UInt32

A bitwise-OR of 0 or more of the flags NAME_FLAG_ALLOW_REPLACEMENT, NAME_FLAG_REPLACE_EXISTING and NAME_FLAG_DO_NOT_QUEUE

Returns:

REQUEST_NAME_REPLY_PRIMARY_OWNER, REQUEST_NAME_REPLY_IN_QUEUE, REQUEST_NAME_REPLY_EXISTS or REQUEST_NAME_REPLY_ALREADY_OWNER

Raises DBusExceptionDBusException:
 

if the bus daemon cannot be contacted or returns an error.

start_service_by_name(bus_name, flags=0)

Start a service which will implement the given bus name on this Bus.

Parameters:
bus_name : str

The well-known bus name to be activated.

flags : dbus.UInt32

Flags to pass to StartServiceByName (currently none are defined)

Returns:

A tuple of 2 elements. The first is always True, the second is either START_REPLY_SUCCESS or START_REPLY_ALREADY_RUNNING.

Raises DBusExceptionDBusException:
 

if the service could not be started.

Since:

0.80.0

watch_name_owner(bus_name, callback)

Watch the unique connection name of the primary owner of the given name.

callback will be called with one argument, which is either the unique connection name, or the empty string (meaning the name is not owned).

Since:0.81.0