t.Fatal("unexpected child error:", err)
	}
	return nil
}

func TestPidFD(t *testing.T) {
	if err := testPidFD(t, false); err != nil {
		t.Fatal("can't start a process:", err)
	}
}

func TestPidFDWithUserNS(t *testing.T) {
	if err := testPidFD(t, true); err != nil {
		if testenv.SyscallIsNotSupported(err) {
			t.Skip("userns not supported:", err)
		}