func (rcv *TCP) Addr() net.Addr {
	if rcv.listener == nil {
		return nil
	}
	return rcv.listener.Addr()
}
func (rcv *TCP) Addr() net.Addr {
	if rcv.listener == nil {
		return nil
	}
	return rcv.listener.Addr()
}
func ( rcv * TCP ) Addr ( ) net . Addr { if rcv . listener == nil { return nil } return rcv . listener . Addr ( ) }
// Addr returns binded socket address. For bind port 0 in tests
Addr returns binded socket address . For bind port 0 in tests