pub unsafe extern "C" fn dbus_connection_add_filter(
conn: *mut DBusConnection,
function: DBusHandleMessageFunction,
user_data: *mut c_void,
free_data_function: DBusFreeFunction,
) -> u32pub unsafe extern "C" fn dbus_connection_add_filter(
conn: *mut DBusConnection,
function: DBusHandleMessageFunction,
user_data: *mut c_void,
free_data_function: DBusFreeFunction,
) -> u32