t.Cleanup(func() {
		testPreHookSetKeepAlive = func(*netFD) {}
	})
	var (
		errHook error
		oldCfg  KeepAliveConfig
	)
	testPreHookSetKeepAlive = func(nfd *netFD) {
		oldCfg, errHook = getCurrentKeepAliveSettings(fdType(nfd.pfd.Sysfd))
	}

	handler := func(ls *localServer, ln Listener) {
		for {
			c, err := ln.Accept()
			if err != nil {
				return
			}
			c.Close()
		}
	}

//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || windows

package net

import (
	"syscall"
	"testing"
	"time"
)

func getCurrentKeepAliveSettings(fd fdType) (cfg KeepAliveConfig, err error) {
	tcpKeepAlive, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE)
	if err != nil {
		return
	}

	"syscall"
	"testing"
)

const (
	syscall_TCP_KEEPIDLE  = windows.TCP_KEEPIDLE
	syscall_TCP_KEEPCNT   = windows.TCP_KEEPCNT
	syscall_TCP_KEEPINTVL = windows.TCP_KEEPINTVL
)

type fdType = syscall.Handle

func maybeSkipKeepAliveTest(t *testing.T) {
	// TODO(panjf2000): Unlike Unix-like OS's, old Windows (prior to Windows 10, version 1709)

package net

import (
	"syscall"
	"testing"
)

const (
	syscall_TCP_KEEPIDLE  = syscall.TCP_KEEPALIVE
	syscall_TCP_KEEPCNT   = sysTCP_KEEPCNT
	syscall_TCP_KEEPINTVL = sysTCP_KEEPINTVL
)

type fdType = int

package net

import (
	"syscall"
	"testing"
)

const (
	syscall_TCP_KEEPIDLE  = syscall.TCP_KEEPIDLE
	syscall_TCP_KEEPCNT   = syscall.TCP_KEEPCNT
	syscall_TCP_KEEPINTVL = syscall.TCP_KEEPINTVL
)

type fdType = int

		t.Fatalf("unknown fdType %q", fdType)
	}
	if err := rc.Control(func(fd uintptr) {
		if hook.called && hookFd != int(fd) {
			t.Fatalf("wrong %s file descriptor: got %d, want %d", fdType, hook.dstfd, int(fd))
		}
	}); err != nil {
		t.Fatalf("syscall.RawConn.Control error: %v", err)
	}
}

func (tc spliceTestCase) testFile(t *testing.T) {
	hook := hookSplice(t)

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

//go:build illumos

package net

import (
	"syscall"
	"testing"
	"time"
)

func getCurrentKeepAliveSettings(fd fdType) (cfg KeepAliveConfig, err error) {
	tcpKeepAlive, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE)
	if err != nil {
		return
	}

package net

import (
	"testing"
	"time"
)

const (
	syscall_TCP_KEEPIDLE  = sysTCP_KEEPIDLE
	syscall_TCP_KEEPCNT   = sysTCP_KEEPCNT
	syscall_TCP_KEEPINTVL = sysTCP_KEEPINTVL
)

type fdType = int

func maybeSkipKeepAliveTest(_ *testing.T) {}

var testConfigs = []KeepAliveConfig{
	{
		Enable:   true,
		Idle:     20 * time.Second, // the minimum value is ten seconds on Solaris

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

//go:build solaris && !illumos

package net

import (
	"internal/syscall/unix"
	"syscall"
	"testing"
	"time"
)

func getCurrentKeepAliveSettings(fd fdType) (cfg KeepAliveConfig, err error) {
	tcpKeepAlive, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE)
	if err != nil {
		return
	}

	var (
		tcpKeepAliveIdle         int

    %3:3 = tf_executor.Merge %2#0, %0#0 : tensor<*x!tf_type.int32ref> {device = "", N = 2, T = "tfdtype$DT_INT32"} loc("while/Merge")
    %4:2 = tf_executor.island(%3#2) wraps "tf.Const"() {device = "", dtype = "tfdtype$DT_INT32", value = dense<10> : tensor<i32>} : () -> tensor<i32> loc("while/Less/y")