poll.CloseFunc(s)
		return -1, os.NewSyscallError("setnonblock", err)
	}
	return s, nil
}

func newFileFD(f *os.File) (*netFD, error) {
	s, err := dupSocket(f)
	if err != nil {
		return nil, err
	}
	family := syscall.AF_UNSPEC
	sotype, err := syscall.GetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_TYPE)
	if err != nil {
		poll.CloseFunc(s)

	// Placeholders for saving original socket system calls.
	origWSASocket   = wsaSocketFunc
	origClosesocket = poll.CloseFunc
	origConnect     = connectFunc
	origConnectEx   = poll.ConnectExFunc
	origListen      = listenFunc
	origAccept      = poll.AcceptFunc
)

func installTestHooks() {
	wsaSocketFunc = sw.WSASocket
	poll.CloseFunc = sw.Closesocket
	connectFunc = sw.Connect
	poll.ConnectExFunc = sw.ConnectEx
	listenFunc = sw.Listen

	origSocket        = socketFunc
	origClose         = poll.CloseFunc
	origConnect       = connectFunc
	origListen        = listenFunc
	origAccept        = poll.AcceptFunc
	origGetsockoptInt = getsockoptIntFunc

	extraTestHookInstallers   []func()
	extraTestHookUninstallers []func()
)

func installTestHooks() {
	socketFunc = sw.Socket
	poll.CloseFunc = sw.Close
	connectFunc = sw.Connect
	listenFunc = sw.Listen

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

//go:build unix || (js && wasm) || wasip1

package poll

import "syscall"

// CloseFunc is used to hook the close call.
var CloseFunc func(int) error = syscall.Close

// AcceptFunc is used to hook the accept call.

package socktest_test

import "syscall"

var (
	socketFunc func(int, int, int) (int, error)
	closeFunc  func(int) error
)

func installTestHooks() {
	socketFunc = sw.Socket
	closeFunc = sw.Close
}

func uninstallTestHooks() {
	socketFunc = syscall.Socket
	closeFunc = syscall.Close

	"sync/atomic"
	"testing"
	"time"
)

var closeHook atomic.Value // func(fd int)

func init() {
	closeFunc := poll.CloseFunc
	poll.CloseFunc = func(fd int) (err error) {
		if v := closeHook.Load(); v != nil {
			if hook := v.(func(int)); hook != nil {
				hook(fd)
			}
		}
		return closeFunc(fd)
	}
}

func TestSplicePipePool(t *testing.T) {
	const N = 64
	var (
		p          *poll.SplicePipe

// Copyright 2017 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 poll

import "syscall"

// CloseFunc is used to hook the close call.
var CloseFunc func(syscall.Handle) error = syscall.Closesocket

// AcceptFunc is used to hook the accept call.

	"os"
	"sync"
	"syscall"
	"testing"
)

var sw socktest.Switch

func TestMain(m *testing.M) {
	installTestHooks()

	st := m.Run()

	for s := range sw.Sockets() {
		closeFunc(s)
	}
	uninstallTestHooks()
	os.Exit(st)
}

func TestSwitch(t *testing.T) {
	const N = 10
	var wg sync.WaitGroup
	wg.Add(N)
	for i := 0; i < N; i++ {
		go func() {
			defer wg.Done()

	// If the descriptor is indeed closed, using a loop would race
	// with some other goroutine opening a new descriptor.
	// (The Linux kernel guarantees that it is closed on an EINTR error.)
	return CloseFunc(fd)
}

// dupCloseOnExecOld is the traditional way to dup an fd and
// set its O_CLOEXEC bit, using two system calls.
func dupCloseOnExecOld(fd int) (int, string, error) {
	syscall.ForkLock.RLock()

	if err == nil {
		syscall.CloseOnExec(s)
	}
	syscall.ForkLock.RUnlock()
	if err != nil {
		return -1, os.NewSyscallError("socket", err)
	}
	if err = syscall.SetNonblock(s, true); err != nil {
		poll.CloseFunc(s)
		return -1, os.NewSyscallError("setnonblock", err)
	}
	return s, nil