var sotype int
	switch net {
	case "unix":
		sotype = syscall.SOCK_STREAM
	case "unixgram":
		sotype = syscall.SOCK_DGRAM
	case "unixpacket":
		sotype = syscall.SOCK_SEQPACKET
	default:
		return nil, UnknownNetworkError(net)
	}

	switch mode {
	case "dial":

	switch net {
	case "ip+nopriv":
	case "ip", "ip4", "ip6":
		switch runtime.GOOS {
		case "plan9":
			return false
		default:
			if os.Getuid() != 0 {
				return false
			}
		}
	case "unix", "unixgram":
		switch runtime.GOOS {
		case "android", "ios", "plan9", "windows":
			return false
		case "aix":
			return unixEnabledOnAIX
		}
	case "unixpacket":
		switch runtime.GOOS {

		ch <- err
		return
	}
	if peer == nil { // for connected-mode sockets
		switch c.LocalAddr().Network() {
		case "udp":
			peer, err = ResolveUDPAddr("udp", string(b[:n]))
		case "unixgram":
			peer, err = ResolveUnixAddr("unixgram", string(b[:n]))
		}
		if err != nil {
			ch <- err
			return
		}
	}
	if _, err := c.WriteTo(b[:n], peer); err != nil {
		if perr := parseWriteError(err); perr != nil {

	}
}

func testSpliceNoUnixgram(t *testing.T) {
	addr, err := ResolveUnixAddr("unixgram", testUnixAddr(t))
	if err != nil {
		t.Fatal(err)
	}
	defer os.Remove(addr.Name)
	up, err := ListenUnixgram("unixgram", addr)
	if err != nil {
		t.Fatal(err)
	}
	defer up.Close()
	clientDown, serverDown := spawnTestSocketPair(t, "tcp")

		var err error
		switch network {
		case "tcp":
			_, err = DialTCP(network, nil, &TCPAddr{Port: 1 << 16})
		case "udp":
			_, err = DialUDP(network, nil, &UDPAddr{Port: 1 << 16})
		case "ip:4294967296":
			_, err = DialIP(network, nil, nil)
		case "unix", "unixpacket", "unixgram":
			_, err = DialUnix(network, nil, &UnixAddr{Name: "//"})
		}

	var operr error
	var fn func(uintptr)
	switch network {
	case "tcp", "udp", "ip":
		return errors.New("ambiguous network: " + network)
	case "unix", "unixpacket", "unixgram":
		fn = func(s uintptr) {
			_, operr = syscall.GetsockoptInt(int(s), syscall.SOL_SOCKET, syscall.SO_ERROR)
		}
	default:
		switch network[len(network)-1] {
		case '4':
			fn = func(s uintptr) {

	t.Parallel()
	for _, network := range []string{"udp", "unixgram"} {
		network := network
		t.Run(network, func(t *testing.T) {
			if !testableNetwork(network) {
				t.Skipf("network %s is not testable on the current platform", network)
			}
			t.Parallel()

			c := newLocalPacketListener(t, network)
			switch network {
			case "unixgram":
				defer os.Remove(c.LocalAddr().String())
			}

		switch network {
		case "tcp", "tcp4", "tcp6":
		case "udp", "udp4", "udp6":
		case "ip", "ip4", "ip6":
			if needsProto {
				return "", 0, UnknownNetworkError(network)
			}
		case "unix", "unixgram", "unixpacket":
		default:
			return "", 0, UnknownNetworkError(network)
		}
		return network, 0, nil
	}
	afnet = network[:i]
	switch afnet {
	case "ip", "ip4", "ip6":
		protostr := network[i+1:]

			w.hostname = "localhost"
		}
	} else {
		var c net.Conn
		c, err = net.Dial(w.network, w.raddr)
		if err == nil {
			w.conn = &netConn{
				conn:  c,
				local: w.network == "unixgram" || w.network == "unix",
			}
			if w.hostname == "" {
				w.hostname = c.LocalAddr().String()
			}
		}
	}
	return
}

// Write sends a log message to the syslog daemon.

		}
	}
	if err := fd.dial(ctx, laddr, raddr, ctrlCtxFn); err != nil {
		fd.Close()
		return nil, err
	}
	return fd, nil
}

func (fd *netFD) ctrlNetwork() string {
	switch fd.net {
	case "unix", "unixgram", "unixpacket":
		return fd.net
	}
	switch fd.net[len(fd.net)-1] {
	case '4', '6':
		return fd.net
	}
	if fd.family == syscall.AF_INET {
		return fd.net + "4"
	}
	return fd.net + "6"
}