// on all systems are Interrupt (send the process an interrupt) and
// Kill (force the process to exit). Interrupt is not implemented on
// Windows; using it with [os.Process.Signal] will return an error.
var (
	Interrupt Signal = syscall.Note("interrupt")
	Kill      Signal = syscall.Note("kill")
)

func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {

	}

	// Check that all Process' public methods work as expected with
	// "done" Process.
	if err := proc.Kill(); err != os.ErrProcessDone {
		t.Errorf("Kill: got %v, want %v", err, os.ErrProcessDone)
	}
	if err := proc.Signal(os.Kill); err != os.ErrProcessDone {
		t.Errorf("Signal: got %v, want %v", err, os.ErrProcessDone)
	}
	if _, err := proc.Wait(); !errors.Is(err, syscall.ECHILD) {

// systems are os.Interrupt (send the process an interrupt) and os.Kill (force
// the process to exit). On Windows, sending os.Interrupt to a process with
// os.Process.Signal is not implemented; it will return an error instead of
// sending a signal.
var (
	Interrupt Signal = syscall.SIGINT
	Kill      Signal = syscall.SIGKILL
)

	testenv.MustHaveGoBuild(t)
	t.Parallel()

	p, err := StartProcess(testenv.GoToolPath(t), []string{"go"}, &ProcAttr{})
	if err != nil {
		t.Fatalf("starting test process: %v", err)
	}
	p.Wait()
	if got := p.Signal(Kill); got != ErrProcessDone {
		t.Errorf("got %v want %v", got, ErrProcessDone)
	}
}

// Lookup of a process that does not exist at time of lookup.
func TestProcessAlreadyDone(t *testing.T) {

	//
	// On Windows, calling Release a second time returns EINVAL.
	return p.release()
}

// Kill causes the [Process] to exit immediately. Kill does not wait until
// the Process has actually exited. This only kills the Process itself,
// not any other processes it may have started.
func (p *Process) Kill() error {
	return p.kill()
}

// Wait waits for the [Process] to exit, and then returns a

	// GetPodStatus and the following SyncPod will not return errors in the
	// case where the pod has been deleted. We are not adding any pods into
	// the fakePodProvider so they are 'deleted'.
	podStatus, err := m.GetPodStatus(ctx, pod.UID, pod.Name, pod.Namespace)
	assert.NoError(t, err)
	result := m.SyncPod(context.Background(), pod, podStatus, []v1.Secret{}, backOff)
	// This will return an error if the pod has _not_ been deleted.

	go func() {
		defer wg.Done()
		// We don't check the error return of Kill. It is
		// possible that the process has already exited, in
		// which case Kill will return an error "process
		// already finished". The purpose of this test is to
		// see whether the race detector reports an error; it
		// doesn't matter whether this Kill succeeds or not.
		cmd.Process.Kill()
	}()

	go func() {
		defer wg.Done()

		// c.Process.Wait returned and we've handed the timer off to c.Wait.
		// It will take care of goroutine shutdown from here.
		return
	case <-timer.C:
	}

	killed := false
	if killErr := c.Process.Kill(); killErr == nil {
		// We appear to have killed the process. c.Process.Wait should return a
		// non-nil error to c.Wait unless the Kill signal races with a successful

	case statusReleased:
		return nil, syscall.EINVAL
	}

	// If we can block until Wait4 will succeed immediately, do so.
	ready, err := p.blockUntilWaitable()
	if err != nil {
		return nil, err
	}
	if ready {
		// Mark the process done now, before the call to Wait4,
		// so that Process.pidSignal will not send a signal.
		p.pidDeactivate(statusDone)
		// Acquire a write lock on sigMu to wait for any

	handle, status := p.handleTransientAcquire()
	switch status {
	case statusDone:
		return ErrProcessDone
	case statusReleased:
		return syscall.EINVAL
	}
	defer p.handleTransientRelease()

	if sig == Kill {
		var terminationHandle syscall.Handle
		e := syscall.DuplicateHandle(^syscall.Handle(0), syscall.Handle(handle), ^syscall.Handle(0), &terminationHandle, syscall.PROCESS_TERMINATE, false, 0)
		if e != nil {