libnisdb/yptol/update.c

30  * DESCRIPTION: Contains the map update thread and related code.
72  * GIVEN :	Pointer to the open map ctrl
82 update_entry_if_required(map_ctrl *map, datum *key)
85 	/* Only update individual entries if entire map is */
87 	if (is_map_updating(map))
92 	 * the map is in need of an update. If it is then fake a
93 	 * recent order. The client will then read the map, using
97 		if (has_map_expired(map))
98 			update_timestamp(map->entries);
106 	if (!has_entry_expired(map, key))
111 	return (update_from_dit(map, key));
119  * INPUTS:	Map control structure for an open map
128 update_from_dit(map_ctrl *map, datum *key)
136 	 * update the entire map instead.
138 	if ((0 == strcmp(map->map_name, NETGROUP_BYHOST)) ||
139 		(0 == strcmp(map->map_name, NETGROUP_BYUSER))) {
140 			return (update_map_if_required(map, FALSE));
144 	ret = read_from_dit(map->map_name, map->domain, key, &dat);
171 				dbm_delete(map->entries, *key);
172 				dbm_delete(map->ttl, *key);
179 	res = dbm_store(map->entries, *key, dat, DBM_REPLACE);
186 	update_entry_ttl(map, key, TTL_RUNNING);
194  * DESCRIPTION:	Called to update an entire map if it is out of date. Map ctrl
196  *		the map is already being updated. It is important that this is
199  * INPUTS:	Map control structure for an open map
206 update_map_if_required(map_ctrl *map, bool_t wait)
219 		unlock_map_ctrl(map);
220 		res = lock_map_update(map);
221 		lock_map_ctrl(map);
224 				"Could not lock map %s for update",
225 								map->map_name);
230 		switch (try_lock_map_update(map)) {
254 	 * nobody beat us to the map update while we were getting it.
256 	if (!has_map_expired(map)) {
258 		unlock_map_update(map);
276 	new_map = dup_map_ctrl(map);
278 		unlock_map_update(map);
283 	 * While thread is running unlock map so other processes can
286 	unlock_map_ctrl(map);
303 		unlock_map_update(map);
304 		if (SUCCESS != lock_map_ctrl(map))
306 			"Could not acquire update lock for %s", map->map_name);
316 	if (1 != lock_map_ctrl(map)) {
318 			"Could not re-acquire lock for %s", map->map_name);
328  * DESCRIPTION:	The update thread this is called to update an entire NIS map.
334  *		map ctrl an possibly deadlocking.
345 	map_ctrl *map;
348 	map = (map_ctrl *)arg;
351 	if (SUCCESS == update_map_from_dit(map, FALSE))
355 	unlock_map_update(map);
358 	free_map_ctrl(map);