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