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   sd_bus_start    ( 3 )

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)