t.Skipf("skipping: %v", err)
		}
		t.Fatal(err)
	}
	t.Cleanup(func() { syscall.Rmdir(subCgroup) })

	cgroupFD, err := syscall.Open(subCgroup, O_PATH, 0)
	if err != nil {
		t.Fatal(&os.PathError{Op: "open", Path: subCgroup, Err: err})
	}
	t.Cleanup(func() { syscall.Close(cgroupFD) })

	return cgroupFD, "/" + path.Base(subCgroup)
}

func TestUseCgroupFD(t *testing.T) {
	testenv.MustHaveExec(t)

	GidMappingsEnableSetgroups bool
	AmbientCaps                []uintptr // Ambient capabilities.
	UseCgroupFD                bool      // Whether to make use of the CgroupFD field.
	CgroupFD                   int       // File descriptor of a cgroup to put the new process into.
	// PidFD, if not nil, is used to store the pidfd of a child, if the