// roundtripped with F_SETLK and F_GETLK.
func TestFcntlFlock(t *testing.T) {
	if runtime.GOOS == "ios" {
		t.Skip("skipping; no child processes allowed on iOS")
	}
	flock := syscall.Flock_t{
		Type:  syscall.F_WRLCK,
		Start: 31415, Len: 271828, Whence: 1,
	}
	if os.Getenv("GO_WANT_HELPER_PROCESS") == "" {
		// parent
		tempDir := t.TempDir()
		name := filepath.Join(tempDir, "TestFcntlFlock")