_ = os.Remove(uds)
	ln, err := net.Listen("unix", uds)
	if err != nil {
		return nil, err
	}

	return ln, nil
}

func listenUDPAddress(ip string, port int) (net.PacketConn, int, error) {
	parsedIP := net.ParseIP(ip)
	ipBind := "udp"
	if parsedIP != nil {
		if parsedIP.To4() == nil && parsedIP.To16() != nil {
			ipBind = "udp6"
		} else if parsedIP.To4() != nil {
			ipBind = "udp4"

	}
	pfd := f.PollFD().Copy()
	fd := newPollFD(net, pfd)
	if err := fd.init(); err != nil {
		pfd.Close()
		return nil, err
	}
	return newFileConn(fd), nil
}

func filePacketConn(f *os.File) (PacketConn, error) {
	return nil, syscall.ENOPROTOOPT
}

func fileListenNet(filetype syscall.Filetype) (string, error) {
	switch filetype {
	case syscall.FILETYPE_SOCKET_STREAM:
		return "tcp", nil

// corresponding to the open file f.
// It is the caller's responsibility to close f when finished.
// Closing c does not affect f, and closing f does not affect c.
func FilePacketConn(f *os.File) (c PacketConn, err error) {
	c, err = filePacketConn(f)
	if err != nil {
		err = &OpError{Op: "file", Net: "file+net", Source: nil, Addr: fileAddr(f.Name()), Err: err}
	}
	return

		return &TCPListener{fd: fd}, nil
	case *UnixAddr:
		return &UnixListener{fd: fd, path: laddr.Name, unlink: false}, nil
	}
	fd.Close()
	return nil, syscall.EINVAL
}

func filePacketConn(f *os.File) (PacketConn, error) {
	fd, err := newFileFD(f)
	if err != nil {
		return nil, err
	}
	switch fd.laddr.(type) {
	case *UDPAddr:
		return newUDPConn(fd), nil
	case *IPAddr:
		return newIPConn(fd), nil

			// suitable address" error on some platforms.
			t.Log(err)
			continue
		}
		ls := (&packetListener{PacketConn: c1}).newLocalServer()
		defer ls.teardown()
		ch := make(chan error, 1)
		handler := func(ls *localPacketServer, c PacketConn) { packetTransponder(c, ch) }
		if err := ls.buildup(handler); err != nil {
			t.Fatal(err)
		}

type addrPortUDPAddr struct {
	netip.AddrPort
}

func (addrPortUDPAddr) Network() string { return "udp" }

// UDPConn is the implementation of the Conn and PacketConn interfaces
// for UDP network connections.
type UDPConn struct {
	conn
}

// SyscallConn returns a raw network connection.
// This implements the syscall.Conn interface.

	if err != nil {
		return nil, err
	}
	if s != "Listen" {
		return nil, errors.New("file does not represent a listener")
	}

	return &TCPListener{fd: fd}, nil
}

func filePacketConn(f *os.File) (PacketConn, error) {
	return nil, syscall.EPLAN9

	}
	n, addr, err := c.readFrom(b)
	if err != nil {
		err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	return n, addr, err
}

// ReadFrom implements the [PacketConn] ReadFrom method.
func (c *UnixConn) ReadFrom(b []byte) (int, Addr, error) {
	if !c.ok() {
		return 0, nil, syscall.EINVAL
	}
	n, addr, err := c.readFrom(b)
	if err != nil {

	addrs, err := DefaultResolver.resolveAddrList(ctx, "listen", network, address, nil)
	if err != nil {
		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: nil, Err: err}
	}
	sl := &sysListener{
		ListenConfig: *lc,
		network:      network,
		address:      address,
	}
	var c PacketConn
	la := addrs.first(isIPv4)
	switch la := la.(type) {

	defer close(ch)
	handler := func(ls *localPacketServer, c PacketConn) {
		if dst, ok := <-ch; ok {
			c.WriteTo([]byte("READFROM TIMEOUT TEST"), dst)
		}
	}
	ls := newLocalPacketServer(t, "udp")
	defer ls.teardown()
	if err := ls.buildup(handler); err != nil {
		t.Fatal(err)
	}

	host, _, err := SplitHostPort(ls.PacketConn.LocalAddr().String())
	if err != nil {
		t.Fatal(err)
	}