//go:nosplit
func sigInitIgnored(s uint32) {
	i := sig.ignored[s/32]
	i |= 1 << (s & 31)
	atomic.Store(&sig.ignored[s/32], i)
}

// Checked by signal handlers.
//
//go:linkname signal_ignored os/signal.signal_ignored
func signal_ignored(s uint32) bool {
	i := atomic.Load(&sig.ignored[s/32])
	return i&(1<<(s&31)) != 0

func Ignore(sig ...os.Signal) {
	cancel(sig, ignoreSignal)
}

// Ignored reports whether sig is currently ignored.
func Ignored(sig os.Signal) bool {
	sn := signum(sig)
	return sn >= 0 && signalIgnored(sn)
}

var (
	// watchSignalLoopOnce guards calling the conditionally
	// initialized watchSignalLoop. If watchSignalLoop is non-nil,
	// it will be run in a goroutine lazily once Notify is invoked.