if err != nil {
		t.Skipf("skipping test because failed to open tty: %v", err)
	}
	defer syscall.Close(ttyFD)

	tty := NewFile(uintptr(ttyFD), "tty")
	defer tty.Close()

	client, server := createSocketPair(t, proto)

	data := bytes.Repeat([]byte{'a'}, int(size))

	wg.Add(1)
	go func() {
		defer wg.Done()
		// The problem (issue #59041) occurs when writing

func newSendFileTest(t *testing.T, proto string, size int64) (net.Conn, *File, net.Conn, []byte, *sendFileHook) {
	t.Helper()

	hook := hookSendFile(t)

	client, server := createSocketPair(t, proto)
	tempFile, data := createTempFile(t, size)

	return client, tempFile, server, data, hook
}

func hookSendFile(t *testing.T) *sendFileHook {
	h := new(sendFileHook)