Function g_unix_signal_add_full

pub unsafe extern "C" fn g_unix_signal_add_full(
    priority: i32,
    signum: i32,
    handler: Option<unsafe extern "C" fn(*mut c_void) -> i32>,
    user_data: *mut c_void,
    notify: Option<unsafe extern "C" fn(*mut c_void)>,
) -> u32