131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
/*
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* lib/cache_mngt.c Cache Management
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
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*/
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/**
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* @ingroup core
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* @defgroup cache_mngt Caching
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* @{
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*/
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#include <netlink-local.h>
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#include <netlink/netlink.h>
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#include <netlink/cache.h>
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#include <netlink/utils.h>
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static struct nl_cache_ops *cache_ops;
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/**
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* @name Cache Operations Sets
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* @{
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*/
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/**
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* Lookup the set cache operations of a certain cache type
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* @arg name name of the cache type
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*
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* @return The cache operations or NULL if no operations
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* have been registered under the specified name.
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*/
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struct nl_cache_ops *nl_cache_ops_lookup(const char *name)
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{
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struct nl_cache_ops *ops;
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for (ops = cache_ops; ops; ops = ops->co_next)
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if (!strcmp(ops->co_name, name))
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return ops;
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return NULL;
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}
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/**
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* Associate a message type to a set of cache operations
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* @arg protocol netlink protocol
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* @arg msgtype netlink message type
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*
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* Associates the specified netlink message type with
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* a registered set of cache operations.
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*
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* @return The cache operations or NULL if no association
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* could be made.
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*/
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struct nl_cache_ops *nl_cache_ops_associate(int protocol, int msgtype)
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{
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int i;
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struct nl_cache_ops *ops;
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for (ops = cache_ops; ops; ops = ops->co_next) {
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if (ops->co_protocol != protocol)
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continue;
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for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++)
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if (ops->co_msgtypes[i].mt_id == msgtype)
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return ops;
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}
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return NULL;
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}
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/**
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* Register a set of cache operations
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* @arg ops cache operations
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*
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* Called by users of caches to announce the avaibility of
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* a certain cache type.
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*
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* @return 0 on success or a negative error code.
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*/
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int nl_cache_mngt_register(struct nl_cache_ops *ops)
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{
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if (!ops->co_name || !ops->co_obj_ops)
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return -NLE_INVAL;
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if (nl_cache_ops_lookup(ops->co_name))
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return -NLE_EXIST;
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ops->co_next = cache_ops;
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cache_ops = ops;
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NL_DBG(1, "Registered cache operations %s\n", ops->co_name);
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return 0;
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}
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/**
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* Unregister a set of cache operations
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* @arg ops cache operations
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*
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* Called by users of caches to announce a set of
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* cache operations is no longer available. The
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* specified cache operations must have been registered
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* previously using nl_cache_mngt_register()
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*
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* @return 0 on success or a negative error code
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*/
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int nl_cache_mngt_unregister(struct nl_cache_ops *ops)
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{
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struct nl_cache_ops *t, **tp;
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for (tp = &cache_ops; (t=*tp) != NULL; tp = &t->co_next)
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if (t == ops)
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break;
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if (!t)
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return -NLE_NOCACHE;
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NL_DBG(1, "Unregistered cache operations %s\n", ops->co_name);
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*tp = t->co_next;
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return 0;
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}
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/** @} */
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/** @} */
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