cache_mngt.c

  1 /*
  2  * lib/cache_mngt.c     Cache Management
  3  *
  4  *      This library is free software; you can redistribute it and/or
  5  *      modify it under the terms of the GNU Lesser General Public
  6  *      License as published by the Free Software Foundation version 2.1
  7  *      of the License.
  8  *
  9  * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
 10  */
 11 
 12 /**
 13  * @ingroup core
 14  * @defgroup cache_mngt Caching
 15  * @{
 16  */
 17 
 18 #include <netlink-local.h>
 19 #include <netlink/netlink.h>
 20 #include <netlink/cache.h>
 21 #include <netlink/utils.h>
 22 
 23 static struct nl_cache_ops *cache_ops;
 24 
 25 /**
 26  * @name Cache Operations Sets
 27  * @{
 28  */
 29 
 30 /**
 31  * Lookup the set cache operations of a certain cache type
 32  * @arg name            name of the cache type
 33  *
 34  * @return The cache operations or NULL if no operations
 35  *         have been registered under the specified name.
 36  */
 37 struct nl_cache_ops *nl_cache_ops_lookup(const char *name)
 38 {
 39         struct nl_cache_ops *ops;
 40 
 41         for (ops = cache_ops; ops; ops = ops->co_next)
 42                 if (!strcmp(ops->co_name, name))
 43                         return ops;
 44 
 45         return NULL;
 46 }
 47 
 48 /**
 49  * Associate a message type to a set of cache operations
 50  * @arg protocol                netlink protocol
 51  * @arg msgtype                 netlink message type
 52  *
 53  * Associates the specified netlink message type with
 54  * a registered set of cache operations.
 55  *
 56  * @return The cache operations or NULL if no association
 57  *         could be made.
 58  */
 59 struct nl_cache_ops *nl_cache_ops_associate(int protocol, int msgtype)
 60 {
 61         int i;
 62         struct nl_cache_ops *ops;
 63 
 64         for (ops = cache_ops; ops; ops = ops->co_next) {
 65                 if (ops->co_protocol != protocol)
 66                         continue;
 67 
 68                 for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++)
 69                         if (ops->co_msgtypes[i].mt_id == msgtype)
 70                                 return ops;
 71         }
 72 
 73         return NULL;
 74 }
 75 
 76 /**
 77  * Register a set of cache operations
 78  * @arg ops             cache operations
 79  *
 80  * Called by users of caches to announce the avaibility of
 81  * a certain cache type.
 82  *
 83  * @return 0 on success or a negative error code.
 84  */
 85 int nl_cache_mngt_register(struct nl_cache_ops *ops)
 86 {
 87         if (!ops->co_name || !ops->co_obj_ops)
 88                 return -NLE_INVAL;
 89 
 90         if (nl_cache_ops_lookup(ops->co_name))
 91                 return -NLE_EXIST;
 92 
 93         ops->co_next = cache_ops;
 94         cache_ops = ops;
 95 
 96         NL_DBG(1, "Registered cache operations %s\n", ops->co_name);
 97 
 98         return 0;
 99 }
100 
101 /**
102  * Unregister a set of cache operations
103  * @arg ops             cache operations
104  *
105  * Called by users of caches to announce a set of
106  * cache operations is no longer available. The
107  * specified cache operations must have been registered
108  * previously using nl_cache_mngt_register()
109  *
110  * @return 0 on success or a negative error code
111  */
112 int nl_cache_mngt_unregister(struct nl_cache_ops *ops)
113 {
114         struct nl_cache_ops *t, **tp;
115 
116         for (tp = &cache_ops; (t=*tp) != NULL; tp = &t->co_next)
117                 if (t == ops)
118                         break;
119 
120         if (!t)
121                 return -NLE_NOCACHE;
122 
123         NL_DBG(1, "Unregistered cache operations %s\n", ops->co_name);
124 
125         *tp = t->co_next;
126         return 0;
127 }
128 
129 /** @} */
130 
131 /** @} */
132
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Sources/libnl-tiny/cache_mngt.c
