pub unsafe extern "C" fn g_unix_fd_add_full(
    priority: i32,
    fd: i32,
    condition: u32,
    function: Option<unsafe extern "C" fn(_: i32, _: u32, _: *mut c_void) -> i32>,
    user_data: *mut c_void,
    notify: Option<unsafe extern "C" fn(_: *mut c_void)>
) -> u32