Resolution: networking.ServiceEntry_NONE,
		},
	}
)

var tcpNone = &config.Config{
	Meta: config.Meta{
		GroupVersionKind:  gvk.ServiceEntry,
		Name:              "tcpNone",
		Namespace:         "tcpNone",
		CreationTimestamp: GlobalTime,
	},
	Spec: &networking.ServiceEntry{
		Hosts:     []string{"tcpnone.com"},
		Addresses: []string{"172.217.0.0/16"},
		Ports: []*networking.ServicePort{

	return &TCPAddr{loopbackIP(net), a.Port, a.Zone}
}

func (c *TCPConn) readFrom(r io.Reader) (int64, error) {
	if n, err, handled := spliceFrom(c.fd, r); handled {
		return n, err
	}
	if n, err, handled := sendFile(c.fd, r); handled {
		return n, err
	}
	return genericReadFrom(c, r)
}

func (c *TCPConn) writeTo(w io.Writer) (int64, error) {
	if n, err, handled := spliceTo(w, c.fd); handled {

	return &TCPAddr{
		IP:   addr.Addr().AsSlice(),
		Zone: addr.Addr().Zone(),
		Port: int(addr.Port()),
	}
}

// TCPConn is an implementation of the [Conn] interface for TCP network
// connections.
type TCPConn struct {
	conn
}

// KeepAliveConfig contains TCP keep-alive options.
//
// If the Idle, Interval, or Count fields are zero, a default value is chosen.

			KeepAliveConfig: cfg}
		c, err := d.Dial("tcp", ls.Listener.Addr().String())
		if err != nil {
			t.Fatal(err)
		}
		defer c.Close()

		if errHook != nil {
			t.Fatal(errHook)
		}

		sc, err := c.(*TCPConn).SyscallConn()
		if err != nil {
			t.Fatal(err)
		}
		if err := sc.Control(func(fd uintptr) {
			verifyKeepAliveSettings(t, fdType(fd), oldCfg, cfg)
		}); err != nil {
			t.Fatal(err)
		}
	}
}

The new type [KeepAliveConfig] permits fine-tuning the keep-alive
options for TCP connections, via a new [TCPConn.SetKeepAliveConfig]

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

package net

import (
	"internal/syscall/windows"
	"syscall"
)

// SetKeepAliveConfig configures keep-alive messages sent by the operating system.
func (c *TCPConn) SetKeepAliveConfig(config KeepAliveConfig) error {
	if !c.ok() {
		return syscall.EINVAL
	}

	if err := setKeepAlive(c.fd, config.Enable); err != nil {

	lr, ok := r.(*io.LimitedReader)
	if ok {
		remain, r = lr.N, lr.R
		if remain <= 0 {
			return 0, nil, true
		}
	}

	var s *netFD
	switch v := r.(type) {
	case *TCPConn:
		s = v.fd
	case tcpConnWithoutWriteTo:
		s = v.fd
	case *UnixConn:
		if v.fd.net != "unix" {
			return 0, nil, false
		}
		s = v.fd
	default:
		return 0, nil, false
	}

//go:build (!windows && !solaris) || illumos

package net

import "syscall"

// SetKeepAliveConfig configures keep-alive messages sent by the operating system.
func (c *TCPConn) SetKeepAliveConfig(config KeepAliveConfig) error {
	if !c.ok() {
		return syscall.EINVAL
	}

	if err := setKeepAlive(c.fd, config.Enable); err != nil {

		if n := r.(*io.LimitedReader).N; n != int64(wantN) {
			t.Errorf("r.N = %d, want %d", n, wantN)
		}
	}

	// poll.Splice is expected to be called when the source is not
	// a wrapper or the destination is TCPConn.
	if tc.limitReadSize == 0 || tc.downNet == "tcp" {
		// We should have called poll.Splice with the right file descriptor arguments.
		if n > 0 && !hook.called {
			t.Fatal("expected poll.Splice to be called")
		}

//go:build !illumos

package net

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

// SetKeepAliveConfig configures keep-alive messages sent by the operating system.
func (c *TCPConn) SetKeepAliveConfig(config KeepAliveConfig) error {
	if !c.ok() {
		return syscall.EINVAL
	}

	if err := setKeepAlive(c.fd, config.Enable); err != nil {