/usr/include/dns/order.h is in libbind-dev 1:9.11.3+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | /*
 * Copyright (C) 2002, 2004-2007, 2016, 2017  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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 http://mozilla.org/MPL/2.0/.
 */
/* $Id: order.h,v 1.9 2007/06/19 23:47:17 tbox Exp $ */
#ifndef DNS_ORDER_H
#define DNS_ORDER_H 1
/*! \file dns/order.h */
#include <isc/lang.h>
#include <isc/types.h>
#include <dns/types.h>
ISC_LANG_BEGINDECLS
isc_result_t
dns_order_create(isc_mem_t *mctx, dns_order_t **orderp);
/*%<
 * Create a order object.
 *
 * Requires:
 * \li	'orderp' to be non NULL and '*orderp == NULL'.
 *\li	'mctx' to be valid.
 *
 * Returns:
 *\li	ISC_R_SUCCESS
 *\li	ISC_R_NOMEMORY
 */
isc_result_t
dns_order_add(dns_order_t *order, dns_name_t *name,
	      dns_rdatatype_t rdtype, dns_rdataclass_t rdclass,
	      unsigned int mode);
/*%<
 * Add a entry to the end of the order list.
 *
 * Requires:
 * \li	'order' to be valid.
 *\li	'name' to be valid.
 *\li	'mode' to be one of #DNS_RDATASETATTR_RANDOMIZE,
 *		#DNS_RDATASETATTR_FIXEDORDER or zero (#DNS_RDATASETATTR_CYCLIC).
 *
 * Returns:
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOMEMORY
 */
unsigned int
dns_order_find(dns_order_t *order, dns_name_t *name,
	       dns_rdatatype_t rdtype, dns_rdataclass_t rdclass);
/*%<
 * Find the first matching entry on the list.
 *
 * Requires:
 *\li	'order' to be valid.
 *\li	'name' to be valid.
 *
 * Returns the mode set by dns_order_add() or zero.
 */
void
dns_order_attach(dns_order_t *source, dns_order_t **target);
/*%<
 * Attach to the 'source' object.
 *
 * Requires:
 * \li	'source' to be valid.
 *\li	'target' to be non NULL and '*target == NULL'.
 */
void
dns_order_detach(dns_order_t **orderp);
/*%<
 * Detach from the object.  Clean up if last this was the last
 * reference.
 *
 * Requires:
 *\li	'*orderp' to be valid.
 */
ISC_LANG_ENDDECLS
#endif /* DNS_ORDER_H */
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