GSocketConnection for the socket that was
accepted.gSocketListenerAccept(object, cancellable = NULL, .errwarn = TRUE)objectcancellableGCancellable object, NULL to ignore.GSocketConnection] a GSocketConnection on success, NULL on error.source.objectGObject pointer will be stored, or NULLerrorGError for error reporting, or NULL to ignore.source.object is not NULL it will be filled out with the source
object specified when the corresponding socket or address was added
to the listener.
If cancellable is not NULL, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error G_IO_ERROR_CANCELLED will be returned.
Since 2.22