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
rulestr

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
rulestr

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_functioncallable

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_namestr

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

dbus_interfacestr

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

bus_namestr

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.

pathstr

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

Keywords
utf8_stringsbool

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_arraysbool

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_keywordstr

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_keywordstr

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_keywordstr

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

member_keywordstr

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

path_keywordstr

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_keywordstr

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_servicestr

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_namestr

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_pathstr

The object path of the desired object

introspectbool

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

follow_name_owner_changesbool

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_namestr

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_namestr

The bus name to look up

Returns

a bool

release_name(name)

Release a bus name.

Parameters
namestr

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
rulestr

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
rulestr

The match rule

Raises DBusExceptionDBusException

on error.

Since

0.80.0

request_name(name, flags=0)

Request a bus name.

Parameters
namestr

The well-known name to be requested

flagsdbus.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_namestr

The well-known bus name to be activated.

flagsdbus.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