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PATH: usr / include / bind9 / dns

/*
 * Copyright (C) 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/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef DNS_RDATASETITER_H
#define DNS_RDATASETITER_H 1

/*****
 ***** Module Info
 *****/

/*! \file dns/rdatasetiter.h
 * \brief
 * The DNS Rdataset Iterator interface allows iteration of all of the
 * rdatasets at a node.
 *
 * The dns_rdatasetiter_t type is like a "virtual class".  To actually use
 * it, an implementation of the class is required.  This implementation is
 * supplied by the database.
 *
 * It is the client's responsibility to call dns_rdataset_disassociate()
 * on all rdatasets returned.
 *
 * XXX more XXX
 *
 * MP:
 *\li	The iterator itself is not locked.  The caller must ensure
 *	synchronization.
 *
 *\li	The iterator methods ensure appropriate database locking.
 *
 * Reliability:
 *\li	No anticipated impact.
 *
 * Resources:
 *\li	TBS
 *
 * Security:
 *\li	No anticipated impact.
 *
 * Standards:
 *\li	None.
 */

/*****
 ***** Imports
 *****/

#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/stdtime.h>

#include <dns/types.h>

ISC_LANG_BEGINDECLS

/*****
 ***** Types
 *****/

typedef struct dns_rdatasetitermethods {
	void		(*destroy)(dns_rdatasetiter_t **iteratorp);
	isc_result_t	(*first)(dns_rdatasetiter_t *iterator);
	isc_result_t	(*next)(dns_rdatasetiter_t *iterator);
	void		(*current)(dns_rdatasetiter_t *iterator,
				   dns_rdataset_t *rdataset);
} dns_rdatasetitermethods_t;

#define DNS_RDATASETITER_MAGIC	     ISC_MAGIC('D','N','S','i')
#define DNS_RDATASETITER_VALID(i)    ISC_MAGIC_VALID(i, DNS_RDATASETITER_MAGIC)

/*%
 * This structure is actually just the common prefix of a DNS db
 * implementation's version of a dns_rdatasetiter_t.
 * \brief
 * Direct use of this structure by clients is forbidden.  DB implementations
 * may change the structure.  'magic' must be #DNS_RDATASETITER_MAGIC for
 * any of the dns_rdatasetiter routines to work.  DB implementations must
 * maintain all DB rdataset iterator invariants.
 */
struct dns_rdatasetiter {
	/* Unlocked. */
	unsigned int			magic;
	dns_rdatasetitermethods_t *	methods;
	dns_db_t *			db;
	dns_dbnode_t *			node;
	dns_dbversion_t *		version;
	isc_stdtime_t			now;
};

void
dns_rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp);
/*%<
 * Destroy '*iteratorp'.
 *
 * Requires:
 *
 *\li	'*iteratorp' is a valid iterator.
 *
 * Ensures:
 *
 *\li	All resources used by the iterator are freed.
 *
 *\li	*iteratorp == NULL.
 */

isc_result_t
dns_rdatasetiter_first(dns_rdatasetiter_t *iterator);
/*%<
 * Move the rdataset cursor to the first rdataset at the node (if any).
 *
 * Requires:
 *\li	'iterator' is a valid iterator.
 *
 * Returns:
 *\li	ISC_R_SUCCESS
 *\li	ISC_R_NOMORE			There are no rdatasets at the node.
 *
 *\li	Other results are possible, depending on the DB implementation.
 */

isc_result_t
dns_rdatasetiter_next(dns_rdatasetiter_t *iterator);
/*%<
 * Move the rdataset cursor to the next rdataset at the node (if any).
 *
 * Requires:
 *\li	'iterator' is a valid iterator.
 *
 * Returns:
 *\li	ISC_R_SUCCESS
 *\li	ISC_R_NOMORE			There are no more rdatasets at the
 *					node.
 *
 *\li	Other results are possible, depending on the DB implementation.
 */

void
dns_rdatasetiter_current(dns_rdatasetiter_t *iterator,
			 dns_rdataset_t *rdataset);
/*%<
 * Return the current rdataset.
 *
 * Requires:
 *\li	'iterator' is a valid iterator.
 *
 *\li	'rdataset' is a valid, disassociated rdataset.
 *
 *\li	The rdataset cursor of 'iterator' is at a valid location (i.e. the
 *	result of last call to a cursor movement command was #ISC_R_SUCCESS).
 */

ISC_LANG_ENDDECLS

#endif /* DNS_RDATASETITER_H */

[-] diff.h [edit]
[-] callbacks.h [edit]
[-] badcache.h [edit]
[-] version.h [edit]
[-] rdataslab.h [edit]
[-] nsec3.h [edit]
[-] dlz_dlopen.h [edit]
[-] validator.h [edit]
[-] rdatasetiter.h [edit]
[-] rriterator.h [edit]
[-] rdata.h [edit]
[-] stats.h [edit]
[+] ..
[-] opcode.h [edit]
[-] dbtable.h [edit]
[-] geoip.h [edit]
[-] catz.h [edit]
[-] journal.h [edit]
[-] zt.h [edit]
[-] tkey.h [edit]
[-] rdatatype.h [edit]
[-] result.h [edit]
[-] view.h [edit]
[-] acache.h [edit]
[-] message.h [edit]
[-] byaddr.h [edit]
[-] dsdigest.h [edit]
[-] rdatastruct.h [edit]
[-] clientinfo.h [edit]
[-] rbt.h [edit]
[-] sdlz.h [edit]
[-] cache.h [edit]
[-] zonekey.h [edit]
[-] acl.h [edit]
[-] enumclass.h [edit]
[-] log.h [edit]
[-] portlist.h [edit]
[-] rdataset.h [edit]
[-] tcpmsg.h [edit]
[-] client.h [edit]
[-] zone.h [edit]
[-] time.h [edit]
[-] xfrin.h [edit]
[-] secproto.h [edit]
[-] rcode.h [edit]
[-] dyndb.h [edit]
[-] peer.h [edit]
[-] ttl.h [edit]
[-] types.h [edit]
[-] rrl.h [edit]
[-] rootns.h [edit]
[-] keytable.h [edit]
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[-] timer.h [edit]
[-] ds.h [edit]
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[-] dispatch.h [edit]
[-] private.h [edit]
[-] ssu.h [edit]
[-] order.h [edit]
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[-] rdatalist.h [edit]
[-] lookup.h [edit]
[-] db.h [edit]
[-] name.h [edit]
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[-] dbiterator.h [edit]
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[-] rdataclass.h [edit]
[-] dlz.h [edit]
[-] tsig.h [edit]
[-] master.h [edit]
[-] rpz.h [edit]