1SD_BUS_START(3)                  sd_bus_start                  SD_BUS_START(3)
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NAME

6       sd_bus_start - Initiate a bus connection to the D-bus broker daemon
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SYNOPSIS

9       #include <systemd/sd-bus.h>
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11       int sd_bus_start(sd_bus *bus);
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DESCRIPTION

14       sd_bus_start() connects an existing bus connection object to the D-Bus
15       broker daemon, usually dbus-daemon(1) or dbus-broker(1). The mechanism
16       to use for the connection must be configured before the call to
17       sd_bus_start(), using one of sd_bus_set_address(3), sd_bus_set_fd(3),
18       or sd_bus_set_exec(3).  sd_bus_start() will open the connection socket
19       or spawn the executable as needed, and asynchronously start a
20       org.freedesktop.DBus.Hello() call. The answer to the Hello call will be
21       processed later from sd_bus_process(3). If opening of the connection or
22       queuing of the asynchronous call fail, the connection will be closed
23       with sd_bus_close(3).
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25       In most cases, it is better to use sd_bus_default_user(3),
26       sd_bus_default_system(3) or related calls instead of the more low-level
27       sd_bus_new() and sd_bus_start(). The higher-level functions not only
28       allocate a bus object but also start the connection to a well-known bus
29       in a single function call.
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RETURN VALUE

32       On success, this function returns a non-negative integer. On failure,
33       it returns a negative errno-style error code.
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35   Errors
36       -EINVAL
37           The input parameter bus is NULL.
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39       -ENOPKG
40           Bus object bus could not be resolved.
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42       -EPERM
43           The input parameter bus is in a wrong state (sd_bus_start() may
44           only be called once on a newly-created bus object).
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46       -ECHILD
47           The bus object bus was created in a different process.
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49       In addition, other connection-related errors may be returned. See
50       sd_bus_send(3).
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NOTES

53       These APIs are implemented as a shared library, which can be compiled
54       and linked to with the libsystemd pkg-config(1) file.
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SEE ALSO

57       systemd(1), sd-bus(3), sd_bus_default(3), sd_bus_call_async(3)
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61systemd 249                                                    SD_BUS_START(3)
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