Copyright (C) Internet Systems Consortium, Inc. ("ISC") SPDX-License-Identifier: MPL-2.0 This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, you can obtain one at https://mozilla.org/MPL/2.0/. See the COPYRIGHT file distributed with this work for additional information regarding copyright ownership. Tests of runtime checks, e.g., that named prevents duplicate processes from running.