Return location for a GUnixFDList or NULL. out[allow-none]
A GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_connection_call_with_unix_fd_list().
NULL if error is set. Otherwise a GVariant tuple with return values. Free with g_variant_unref().
GException on failure.
Finishes an operation started with g_dbus_connection_call_with_unix_fd_list(). Since 2.30