}

// ReadFrom is here to optimize copying from an [*os.File] regular file
// to a [*net.TCPConn] with sendfile, or from a supported src type such
// as a *net.TCPConn on Linux with splice.
func (w *response) ReadFrom(src io.Reader) (n int64, err error) {
	buf := getCopyBuf()
	defer putCopyBuf(buf)

	// Our underlying w.conn.rwc is usually a *TCPConn (with its
	// own ReadFrom method). If not, just fall back to the normal
	// copy method.

	// If the code is correct, this test will never fail, regardless of timeout.
	args.A = 10 // 10 ms
	done := make(chan *Call, 1)
	call := client.Go("Arith.SleepMilli", args, reply, done)
	c.(*net.TCPConn).CloseWrite()
	<-done
	if call.Error != nil {
		t.Fatal(err)
	}
}

func benchmarkEndToEnd(dial func() (*Client, error), b *testing.B) {
	once.Do(startServer)
	client, err := dial()

	// opening the listening socket, so we can't use that to wait until it
	// has started listening. Thus we are forced to poll until we get a
	// connection.
	var tcpConn net.Conn
	for i := uint(0); i < 5; i++ {
		tcpConn, err = net.DialTCP("tcp", nil, &net.TCPAddr{
			IP:   net.IPv4(127, 0, 0, 1),
			Port: serverPort,
		})
		if err == nil {
			break
		}

// was resolved before the other one was processed, the second one
// would never be resolved.
// Before this issue was fixed this test failed on Windows,
// where va_list expands to a named char* type.
typedef va_list TypeOne;
typedef char *TypeTwo;

// issue 28540

static void twoargs1(void *p, int n) {}
static void *twoargs2() { return 0; }
static int twoargs3(void * p) { return 0; }

// issue 28545

					conn, err := d.DialContext(ctx, network, addr)
					if err != nil {
						return nil, err
					}

					tcpConn, ok := conn.(*net.TCPConn)
					if !ok {
						return nil, fmt.Errorf("%s/%s does not provide a *net.TCPConn", network, addr)
					}

					tConn.TCPConn = tcpConn
					return tConn, nil
				}
			}

			cst := newClientServerTest(
				t,
				mode,

}

// sysDialer contains a Dial's parameters and configuration.
type sysDialer struct {
	Dialer
	network, address string
	testHookDialTCP  func(ctx context.Context, net string, laddr, raddr *TCPAddr) (*TCPConn, error)
}

// Dial connects to the address on the named network.
//
// See func Dial for a description of the network and address
// parameters.
//

pkg net, method (*Dialer) SetMultipathTCP(bool) #56539
pkg net, method (*ListenConfig) MultipathTCP() bool #56539
pkg net, method (*ListenConfig) SetMultipathTCP(bool) #56539
pkg net, method (*TCPConn) MultipathTCP() (bool, error) #59166
pkg reflect, method (Value) Clear() #55002
pkg reflect, type SliceHeader //deprecated #56906
pkg reflect, type StringHeader //deprecated #56906

}

type wrappedListener struct {
	net.Listener
	t *testing.T
}

func (ln wrappedListener) Accept() (net.Conn, error) {
	c, err := ln.Listener.Accept()

	if tc, ok := c.(*net.TCPConn); ok {
		ln.t.Logf("[server] seen new connection: %#v", tc)
	}
	return c, err

			if err != nil {
				t.Errorf("Hijack in Handler: %v", err)
				return
			}
			if _, ok := c.(*net.TCPConn); !ok {
				// Verify it's not wrapped in some type.
				// Not strictly a go1 compat issue, but in practice it probably is.
				t.Errorf("type of hijacked conn is %T; want *net.TCPConn", c)
			}
			fmt.Fprintf(c, "HTTP/1.0 200 OK\r\nX-Addr: %v\r\nContent-Length: 0\r\n\r\n", r.RemoteAddr)
			c.Close()

pkg net, method (*TCPConn) Close() error
pkg net, method (*TCPConn) CloseRead() error
pkg net, method (*TCPConn) CloseWrite() error
pkg net, method (*TCPConn) File() (*os.File, error)
pkg net, method (*TCPConn) LocalAddr() Addr
pkg net, method (*TCPConn) Read([]uint8) (int, error)
pkg net, method (*TCPConn) ReadFrom(io.Reader) (int64, error)
pkg net, method (*TCPConn) RemoteAddr() Addr