sd_bus_start - Initiate a bus connection to the D-bus broker daemon
int sd_bus_start(sd_bus *bus);
sd_bus_start() connects an existing bus connection object to the D-Bus
broker daemon, usually dbus-daemon(1) or dbus-broker(1). The
mechanism to use for the connection must be configured before the call to
sd_bus_start(), using one of sd_bus_set_address(3),
sd_bus_set_fd(3), or sd_bus_set_exec(3). sd_bus_start()
will open the connection socket or spawn the executable as needed, and
asynchronously start a org.freedesktop.DBus.Hello() call. The answer to
the Hello call will be processed later from sd_bus_process(3). If
opening of the connection or queuing of the asynchronous call fail, the
connection will be closed with sd_bus_close(3).
In most cases, it is better to use sd_bus_default_user(3),
sd_bus_default_system(3) or related calls instead of the more
low-level sd_bus_new() and sd_bus_start(). The higher-level
functions not only allocate a bus object but also start the connection to a
well-known bus in a single function call.
On success, this function returns a non-negative integer. On failure, it returns
a negative errno-style error code.
The input parameter bus is NULL.
Bus object bus could not be resolved.
The input parameter bus is in a wrong state
(sd_bus_start() may only be called once on a newly-created bus
The bus object bus was created in a different
In addition, other connection-related errors may be returned. See
These APIs are implemented as a shared library, which can be compiled and linked
to with the libsystemd pkg-config(1) file.