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

pkg syscall (linux-386-cgo), const CLONE_PIDFD = 4096 #51246
pkg syscall (linux-386-cgo), const CLONE_PIDFD ideal-int #51246
pkg syscall (linux-386-cgo), type SysProcAttr struct, CgroupFD int #51246
pkg syscall (linux-386-cgo), type SysProcAttr struct, UseCgroupFD bool #51246
pkg syscall (linux-386), const CLONE_CLEAR_SIGHAND = 4294967296 #51246
pkg syscall (linux-386), const CLONE_CLEAR_SIGHAND ideal-int #51246

		{"Sync", Func, 0},
		{"SyncFileRange", Func, 0},
		{"SysProcAttr", Type, 0},
		{"SysProcAttr.AdditionalInheritedHandles", Field, 17},
		{"SysProcAttr.AmbientCaps", Field, 9},
		{"SysProcAttr.CgroupFD", Field, 20},
		{"SysProcAttr.Chroot", Field, 0},
		{"SysProcAttr.Cloneflags", Field, 2},
		{"SysProcAttr.CmdLine", Field, 0},
		{"SysProcAttr.CreationFlags", Field, 1},
		{"SysProcAttr.Credential", Field, 0},