return err
		}
		if sa.Port <= 0 || sa.Port >= 1<<16 {
			return &AddrError{
				Err:  "port out of range",
				Addr: sa.String(),
			}
		}
		return nil

	case "unix", "unixgram", "unixpacket":
		sa, ok := sa.(*UnixAddr)
		if !ok {
			return &AddrError{
				Err:  "non-Unix address for " + net + " network",
				Addr: sa.String(),
			}
		}
		if sa.Name != "" {

			}
			c.Close()
		}
	})
	t.Run("PacketDial", func(t *testing.T) {
		for _, network := range []string{"udp", "udp4", "udp6", "unixgram"} {
			if !testableNetwork(network) {
				continue
			}
			c1 := newLocalPacketListener(t, network)
			if network == "unixgram" {
				defer os.Remove(c1.LocalAddr().String())
			}
			defer c1.Close()
			d := Dialer{Control: controlOnConnSetup}

			}
			ln := newLocalListener(t, network, &ListenConfig{Control: controlOnConnSetup})
			ln.Close()
		}
	})
	t.Run("PacketListen", func(t *testing.T) {
		for _, network := range []string{"udp", "udp4", "udp6", "unixgram"} {
			if !testableNetwork(network) {
				continue
			}
			c := newLocalPacketListener(t, network, &ListenConfig{Control: controlOnConnSetup})
			c.Close()
		}
	})

		fd.kind = kindFile
	case "console":
		fd.kind = kindConsole
	case "pipe":
		fd.kind = kindPipe
	case "tcp", "tcp4", "tcp6",
		"udp", "udp4", "udp6",
		"ip", "ip4", "ip6",
		"unix", "unixgram", "unixpacket":
		fd.kind = kindNet
	default:
		return "", errors.New("internal error: unknown network type " + net)
	}
	fd.isFile = fd.kind != kindNet

	var err error
	if pollable {