инициируйте подключение шины к демону брокера D-bus (Initiate a bus connection to the D-bus broker daemon)
Имя (Name)
sd_bus_start - Initiate a bus connection to the D-bus broker
daemon
Синопсис (Synopsis)
#include <systemd/sd-bus.h>
int sd_bus_start(sd_bus *bus);
Описание (Description)
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.
Возвращаемое значение (Return value)
On success, this function returns a non-negative integer. On
failure, it returns a negative errno-style error code.
Errors
-EINVAL
The input parameter bus is NULL.
-ENOPKG
Bus object bus could not be resolved.
-EPERM
The input parameter bus is in a wrong state (sd_bus_start()
may only be called once on a newly-created bus object).
-ECHILD
The bus object bus was created in a different process.
In addition, other connection-related errors may be returned. See
sd_bus_send(3).
Примечание (Note)
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
Смотри также (See also)
systemd(1), sd-bus(3), sd_bus_default(3), sd_bus_call_async(3)
