sd_bus_attach_event, sd_bus_detach_event, sd_bus_get_event - Attach a bus
connection object to an event loop
int sd_bus_attach_event(sd_bus *bus,
sd_bus_attach_event() attaches the specified bus connection object to an
sd-event(3) event loop object at the specified priority (see
sd_event_source_set_priority(3) for details on event loop priorities).
When a bus connection object is attached to an event loop incoming messages
will be automatically read and processed, and outgoing messages written,
whenever the event loop is run. When the event loop is about to terminate, the
bus connection is automatically flushed and closed (see
sd_bus_set_close_on_exit(3) for details on this). By default bus
connection objects are not attached to any event loop. When a bus connection
object is attached to one it is not necessary to invoke sd_bus_wait(3)
or sd_bus_process(3) as this functionality is handled automatically by
the event loop.
sd_bus_detach_event() detaches a bus object from its event
The sd_bus_get_event() returns the event loop object the
specified bus object is currently attached to, or NULL if it is
currently not attached to any.
Note that sd_bus_attach_event() is only one of three
supported ways to implement I/O event handling for bus connections.
Alternatively use sd_bus_get_fd(3) for hooking up a bus connection
object with external or manual event loops. Or use sd_bus_wait(3) as
a simple synchronous, blocking I/O waiting call.
On success, sd_bus_attach_event() and sd_bus_detach_event() return
0 or a positive integer. On failure, they return a negative errno-style error
sd_bus_get_event() returns an event loop object or
Returned errors may indicate the following problems:
The bus connection has been created in a different
These APIs are implemented as a shared library, which can be compiled and linked
to with the libsystemd pkg-config(1) file.