sd_bus_set_server, sd_bus_is_server, sd_bus_get_bus_id, sd_bus_set_bus_client, sd_bus_is_bus_client, sd_bus_set_monitor, sd_bus_is_monitor — Configure connection mode for a bus object
sd_bus_set_server() configures the bus object as a server for direct D-Bus
b enables/disables the server mode. If zero, the server mode is
disabled. Otherwise, the server mode is enabled. Configuring a bus object as a server is required to
allow establishing direct connections between two peers without going via the D-Bus daemon.
id must contain a 128-bit integer id for the server. If clients add a guid field
to their D-Bus address string, the server id must match this guid or the D-Bus authentication handshake
will fail. If no specific id is defined for the server,
can be used to generate a random id instead.
sd_bus_is_server() returns whether the server mode is enabled for the given
sd_bus_get_bus_id() stores the D-Bus server id configured using
sd_bus_set_server() (for server bus objects) or received during D-Bus authentication
(for client bus objects) in
sd_bus_set_bus_client() configures the bus object as a D-Bus daemon client.
b enables/disables the client mode. If zero, the client mode is disabled and the
bus object should connect directly to a D-Bus server. Otherwise, the client mode is enabled and the bus
object should connect to a D-Bus daemon. When connecting to an existing bus using any of the functions in
family of functions or any of the functions in the
of functions, the bus object is automatically configured as a bus client. However, when connecting to a
D-Bus daemon by calling
sd_bus_start(3), the bus
object should be manually configured as a bus client using
By default, a bus object is not configured as a D-Bus daemon client.
sd_bus_is_bus_client() returns whether the client mode is enabled/disabled for
the given bus object.
sd_bus_set_monitor() configures the bus object as a D-Bus monitor object.
b enables/disables the monitor mode. If zero, the monitor mode is disabled. If
non-zero, the monitor mode is enabled. When the monitor mode is enabled, no messages may be sent via the
bus object and it may not expose any objects on the bus. To start monitoring messages, call the
org.freedesktop.DBus.Monitoring.BecomeMonitor method of the D-Bus daemon and pass
a list of matches indicating which messages to intercept. See
The D-Bus specification for more information.
sd_bus_is_monitor() returns whether the monitor mode is enabled/disabled for
the given bus object.
sd_bus_set_monitor() return a non-negative integer. On failure, they return a
negative errno-style error code.
sd_bus_is_monitor() return a positive integer when the server or client mode is
enabled, respectively. Otherwise, they return zero.
Returned errors may indicate the following problems:
The bus connection has been created in a different process, library or module instance.
The bus connection has already been started.
The bus cannot be resolved.
A required parameter was
b was zero and
id did not equal
The bus is not connected.
Functions described here are available as a shared
library, which can be compiled against and linked to with the
The code described here uses
which is declared to be not multi-thread-safe. This means that the code calling the functions described
here must not call
from a parallel thread. It is recommended to only do calls to
from an early phase of the program when no other threads have been started.