pub unsafe extern "C" fn g_dbus_connection_register_subtree(
    connection: *mut GDBusConnection,
    object_path: *const c_char,
    vtable: *const GDBusSubtreeVTable,
    flags: GDBusSubtreeFlags,
    user_data: gpointer,
    user_data_free_func: GDestroyNotify,
    error: *mut *mut GError
) -> c_uint