defer writeFile.Close()
	readFile := os.NewFile(uintptr(fds[1]), "read-socket")
	defer readFile.Close()

	cw, err := FileConn(writeFile)
	if err != nil {
		t.Fatalf("FileConn: %v", err)
	}
	defer cw.Close()
	cr, err := FileConn(readFile)
	if err != nil {
		t.Fatalf("FileConn: %v", err)
	}
	defer cr.Close()

	ucw, ok := cw.(*UnixConn)
	if !ok {
		t.Fatalf("got %T; want UnixConn", cw)
	}

		cliFile := os.NewFile(uintptr(fds[1]), "client")
		defer srvFile.Close()
		defer cliFile.Close()

		srv, err := net.FileConn(srvFile)
		if err != nil {
			t.Errorf("FileConn: %v", err)
			return
		}
		defer srv.Close()

		cli, err := net.FileConn(cliFile)
		if err != nil {
			t.Errorf("FileConn: %v", err)
			return
		}
		defer cli.Close()

		var ucred syscall.Ucred
		if os.Getuid() != 0 {

package net

import "os"

// BUG(mikio): On JS and Windows, the FileConn, FileListener and
// FilePacketConn functions are not implemented.

type fileAddr string

func (fileAddr) Network() string  { return "file+net" }
func (f fileAddr) String() string { return string(f) }

// FileConn returns a copy of the network connection corresponding to
// the open file f.

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package net

import (
	"os"
	"syscall"
)

func fileConn(f *os.File) (Conn, error) {
	// TODO: Implement this
	return nil, syscall.EWINDOWS
}

func fileListener(f *os.File) (Listener, error) {
	// TODO: Implement this
	return nil, syscall.EWINDOWS
}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build js

package net

import (
	"os"
	"syscall"
)

func fileConn(f *os.File) (Conn, error)             { return nil, syscall.ENOPROTOOPT }
func fileListener(f *os.File) (Listener, error)     { return nil, syscall.ENOPROTOOPT }

// license that can be found in the LICENSE file.

//go:build wasip1

package net

import (
	"syscall"
	"testing"
)

// The tests in this file intend to validate the ability for net.FileConn and
// net.FileListener to handle both TCP and UDP sockets. Ideally we would test
// the public interface by constructing an *os.File from a file descriptor

	if len(out) > 0 || err != nil {
		t.Fatalf("child process: %q, %v", out, err)
	}

	c, err := net.FileConn(readFile)
	if err != nil {
		t.Fatalf("FileConn: %v", err)
	}
	defer c.Close()

	uc, ok := c.(*net.UnixConn)
	if !ok {
		t.Fatalf("unexpected FileConn type; expected UnixConn, got %T", c)
	}

	buf := make([]byte, 32) // expect 1 byte
	oob := make([]byte, 32) // expect 24 bytes

				t.Error(perr)
			}
			t.Fatal(err)
		}

		c2, err := FileConn(f)
		if err := f.Close(); err != nil {
			t.Error(err)
		}
		if err != nil {
			if perr := parseCommonError(err); perr != nil {
				t.Error(perr)
			}
			t.Fatal(err)
		}
		defer c2.Close()

		if _, err := c2.Write([]byte("FILECONN TEST")); err != nil {
			if perr := parseWriteError(err); perr != nil {

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

func fileConn(f *os.File) (Conn, error) {
	filetype, err := fd_fdstat_get_type(f.PollFD().Sysfd)
	if err != nil {
		return nil, err
	}
	net, err := fileConnNet(filetype)
	if err != nil {
		return nil, err
	}

	raddr := fd.addrFunc()(rsa)
	fd.net = laddr.Network()
	if err := fd.init(); err != nil {
		fd.Close()
		return nil, err
	}
	fd.setAddr(laddr, raddr)
	return fd, nil
}

func fileConn(f *os.File) (Conn, error) {
	fd, err := newFileFD(f)
	if err != nil {
		return nil, err
	}
	switch fd.laddr.(type) {
	case *TCPAddr: