package tcp import ( "v2ray.com/core/common" "v2ray.com/core/common/net" ) // PickPort returns an unused TCP port in the system. The port returned is highly likely to be unused, but not guaranteed. func PickPort() net.Port { listener, err := net.Listen("tcp4", "127.0.0.1:0") common.Must(err) defer listener.Close() addr := listener.Addr().(*net.TCPAddr) return net.Port(addr.Port) }