func TestRaceName(t *testing.T) {
	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
		doRace()
		return
	}

	out := runTest(t, "TestRaceName")

	if regexp.MustCompile(`=== NAME\s*$`).Match(out) {
		t.Errorf("incorrectly reported test with no name")
	}
}

func TestRaceSubReports(t *testing.T) {
	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
		t.Parallel()
		c1 := make(chan bool, 1)

	testenv.MustHaveExec(t)

	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
		// Child: wait for a signal.
		time.Sleep(time.Hour)
	}

	exe, err := os.Executable()
	if err != nil {
		t.Fatal(err)
	}

	var pidfd int
	cmd := testenv.Command(t, exe, "-test.run=^TestPidFD$")
	cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
	cmd.SysProcAttr = &syscall.SysProcAttr{
		PidFD: &pidfd,

		if os.IsNotExist(err) {
			return p, nil
		}
	}
	return "", errors.New("Could not find unused drive letter.")
}

func TestRootDirAsTemp(t *testing.T) {
	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
		fmt.Print(os.TempDir())
		os.Exit(0)
	}

	testenv.MustHaveExec(t)
	t.Parallel()

	exe, err := os.Executable()
	if err != nil {
		t.Fatal(err)
	}

		t.Skipf("skipping test on plan9; see issue 8206")
	}

	if Getenv("GO_WANT_HELPER_PROCESS") == "1" {
		fmt.Print(Getppid())
		Exit(0)
	}

	testenv.MustHaveExec(t)
	t.Parallel()

	cmd := testenv.Command(t, Args[0], "-test.run=^TestGetppid$")
	cmd.Env = append(Environ(), "GO_WANT_HELPER_PROCESS=1")

	// verify that Getppid() from the forked process reports our process id

	var buf strings.Builder
	child := testenv.Command(t, "strace", "-f", "-q", os.Args[0], "-test.run=^TestLinuxSendfileChild$")
	child.ExtraFiles = append(child.ExtraFiles, lnf)
	child.Env = append([]string{"GO_WANT_HELPER_PROCESS=1"}, os.Environ()...)
	child.Stdout = &buf
	child.Stderr = &buf
	if err := child.Start(); err != nil {
		t.Skipf("skipping; failed to start straced child: %v", err)
	}