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<h1>apr_sdbm.h</h1> </div>
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<a href="apr__sdbm_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Licensed to the Apache Software Foundation (ASF) under one or more</span>
<a name="l00002"></a>00002 <span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span>
<a name="l00003"></a>00003 <span class="comment"> * this work for additional information regarding copyright ownership.</span>
<a name="l00004"></a>00004 <span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span>
<a name="l00005"></a>00005 <span class="comment"> * (the "License"); you may not use this file except in compliance with</span>
<a name="l00006"></a>00006 <span class="comment"> * the License. You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span>
<a name="l00012"></a>00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment"> * See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment"> * limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment"> */</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="comment">/*</span>
<a name="l00018"></a>00018 <span class="comment"> * sdbm - ndbm work-alike hashed database library</span>
<a name="l00019"></a>00019 <span class="comment"> * based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978).</span>
<a name="l00020"></a>00020 <span class="comment"> * author: oz@nexus.yorku.ca</span>
<a name="l00021"></a>00021 <span class="comment"> * status: ex-public domain</span>
<a name="l00022"></a>00022 <span class="comment"> */</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="preprocessor">#ifndef APR_SDBM_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor">#define APR_SDBM_H</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "apu.h"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include "<a class="code" href="apr__errno_8h.html" title="APR Error Codes.">apr_errno.h</a>"</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="apr__file__io_8h.html" title="APR File I/O Handling.">apr_file_io.h</a>"</span> <span class="comment">/* for apr_fileperms_t */</span>
<a name="l00030"></a>00030 <span class="comment"></span>
<a name="l00031"></a>00031 <span class="comment">/** </span>
<a name="l00032"></a>00032 <span class="comment"> * @file apr_sdbm.h</span>
<a name="l00033"></a>00033 <span class="comment"> * @brief apr-util SDBM library</span>
<a name="l00034"></a>00034 <span class="comment"> */</span><span class="comment"></span>
<a name="l00035"></a>00035 <span class="comment">/**</span>
<a name="l00036"></a>00036 <span class="comment"> * @defgroup APR_Util_DBM_SDBM SDBM library</span>
<a name="l00037"></a>00037 <span class="comment"> * @ingroup APR_Util_DBM</span>
<a name="l00038"></a>00038 <span class="comment"> * @{</span>
<a name="l00039"></a>00039 <span class="comment"> */</span>
<a name="l00040"></a>00040 <span class="comment"></span>
<a name="l00041"></a>00041 <span class="comment">/**</span>
<a name="l00042"></a>00042 <span class="comment"> * Structure for referencing an sdbm</span>
<a name="l00043"></a>00043 <span class="comment"> */</span>
<a name="l00044"></a><a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">00044</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a>;
<a name="l00045"></a>00045 <span class="comment"></span>
<a name="l00046"></a>00046 <span class="comment">/**</span>
<a name="l00047"></a>00047 <span class="comment"> * Structure for referencing the datum record within an sdbm</span>
<a name="l00048"></a>00048 <span class="comment"> */</span>
<a name="l00049"></a><a class="code" href="structapr__sdbm__datum__t.html">00049</a> <span class="keyword">typedef</span> <span class="keyword">struct </span>{<span class="comment"></span>
<a name="l00050"></a>00050 <span class="comment"> /** pointer to the data stored/retrieved */</span>
<a name="l00051"></a><a class="code" href="structapr__sdbm__datum__t.html#a927c668d3912a4cc8466b0f551d00169">00051</a> <span class="keywordtype">char</span> *<a class="code" href="structapr__sdbm__datum__t.html#a927c668d3912a4cc8466b0f551d00169">dptr</a>;<span class="comment"></span>
<a name="l00052"></a>00052 <span class="comment"> /** size of data */</span>
<a name="l00053"></a>00053 <span class="comment">/* apr_ssize_t for release 2.0??? */</span>
<a name="l00054"></a><a class="code" href="structapr__sdbm__datum__t.html#aedbd0295ba540695d5b407f1dec90eb5">00054</a> <span class="keywordtype">int</span> <a class="code" href="structapr__sdbm__datum__t.html#aedbd0295ba540695d5b407f1dec90eb5">dsize</a>;
<a name="l00055"></a>00055 } <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a>;
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="comment">/* The extensions used for the database files */</span><span class="comment"></span>
<a name="l00058"></a>00058 <span class="comment">/** SDBM Directory file extension */</span>
<a name="l00059"></a><a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gafabaf97932efa0eebfb1cc6b692a111f">00059</a> <span class="preprocessor">#define APR_SDBM_DIRFEXT ".dir"</span>
<a name="l00060"></a>00060 <span class="preprocessor"></span><span class="comment">/** SDBM page file extension */</span>
<a name="l00061"></a><a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaa03fa1d1183240ca0845c54cc07df557">00061</a> <span class="preprocessor">#define APR_SDBM_PAGFEXT ".pag"</span>
<a name="l00062"></a>00062 <span class="preprocessor"></span>
<a name="l00063"></a>00063 <span class="comment">/* flags to sdbm_store */</span>
<a name="l00064"></a><a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gad42d896bab08b5e210f489fa59656807">00064</a> <span class="preprocessor">#define APR_SDBM_INSERT 0 </span><span class="comment">/**< Insert */</span>
<a name="l00065"></a><a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#ga84e2252c9ddf5e6c64ed1be43d2d0e53">00065</a> <span class="preprocessor">#define APR_SDBM_REPLACE 1 </span><span class="comment">/**< Replace */</span>
<a name="l00066"></a><a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#ga64cd385609059cf151e54c7046d92ec3">00066</a> <span class="preprocessor">#define APR_SDBM_INSERTDUP 2 </span><span class="comment">/**< Insert with duplicates */</span>
<a name="l00067"></a>00067 <span class="comment"></span>
<a name="l00068"></a>00068 <span class="comment">/**</span>
<a name="l00069"></a>00069 <span class="comment"> * Open an sdbm database by file name</span>
<a name="l00070"></a>00070 <span class="comment"> * @param db The newly opened database</span>
<a name="l00071"></a>00071 <span class="comment"> * @param name The sdbm file to open</span>
<a name="l00072"></a>00072 <span class="comment"> * @param mode The flag values (APR_READ and APR_BINARY flags are implicit)</span>
<a name="l00073"></a>00073 <span class="comment"> * <PRE></span>
<a name="l00074"></a>00074 <span class="comment"> * APR_WRITE open for read-write access</span>
<a name="l00075"></a>00075 <span class="comment"> * APR_CREATE create the sdbm if it does not exist</span>
<a name="l00076"></a>00076 <span class="comment"> * APR_TRUNCATE empty the contents of the sdbm</span>
<a name="l00077"></a>00077 <span class="comment"> * APR_EXCL fail for APR_CREATE if the file exists</span>
<a name="l00078"></a>00078 <span class="comment"> * APR_DELONCLOSE delete the sdbm when closed</span>
<a name="l00079"></a>00079 <span class="comment"> * APR_SHARELOCK support locking across process/machines</span>
<a name="l00080"></a>00080 <span class="comment"> * </PRE></span>
<a name="l00081"></a>00081 <span class="comment"> * @param perms Permissions to apply to if created</span>
<a name="l00082"></a>00082 <span class="comment"> * @param p The pool to use when creating the sdbm</span>
<a name="l00083"></a>00083 <span class="comment"> * @remark The sdbm name is not a true file name, as sdbm appends suffixes </span>
<a name="l00084"></a>00084 <span class="comment"> * for seperate data and index files.</span>
<a name="l00085"></a>00085 <span class="comment"> */</span>
<a name="l00086"></a>00086 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#ga08c6121b4159ae86cec6e915e1e5d758">apr_sdbm_open</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> **db, const <span class="keywordtype">char</span> *name,
<a name="l00087"></a>00087 apr_int32_t mode,
<a name="l00088"></a>00088 <a class="code" href="group__apr__file__info.html#ga3af19c4c47007169064a70f9351bc7d8">apr_fileperms_t</a> perms, <a class="code" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p);
<a name="l00089"></a>00089 <span class="comment"></span>
<a name="l00090"></a>00090 <span class="comment">/**</span>
<a name="l00091"></a>00091 <span class="comment"> * Close an sdbm file previously opened by apr_sdbm_open</span>
<a name="l00092"></a>00092 <span class="comment"> * @param db The database to close</span>
<a name="l00093"></a>00093 <span class="comment"> */</span>
<a name="l00094"></a>00094 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf684c3a70d2c9ebe02bb1e2fffe23e1e">apr_sdbm_close</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db);
<a name="l00095"></a>00095 <span class="comment"></span>
<a name="l00096"></a>00096 <span class="comment">/**</span>
<a name="l00097"></a>00097 <span class="comment"> * Lock an sdbm database for concurency of multiple operations</span>
<a name="l00098"></a>00098 <span class="comment"> * @param db The database to lock</span>
<a name="l00099"></a>00099 <span class="comment"> * @param type The lock type</span>
<a name="l00100"></a>00100 <span class="comment"> * <PRE></span>
<a name="l00101"></a>00101 <span class="comment"> * APR_FLOCK_SHARED</span>
<a name="l00102"></a>00102 <span class="comment"> * APR_FLOCK_EXCLUSIVE</span>
<a name="l00103"></a>00103 <span class="comment"> * </PRE></span>
<a name="l00104"></a>00104 <span class="comment"> * @remark Calls to apr_sdbm_lock may be nested. All apr_sdbm functions</span>
<a name="l00105"></a>00105 <span class="comment"> * perform implicit locking. Since an APR_FLOCK_SHARED lock cannot be </span>
<a name="l00106"></a>00106 <span class="comment"> * portably promoted to an APR_FLOCK_EXCLUSIVE lock, apr_sdbm_store and </span>
<a name="l00107"></a>00107 <span class="comment"> * apr_sdbm_delete calls will fail if an APR_FLOCK_SHARED lock is held.</span>
<a name="l00108"></a>00108 <span class="comment"> * The apr_sdbm_lock call requires the database to be opened with the</span>
<a name="l00109"></a>00109 <span class="comment"> * APR_SHARELOCK mode value.</span>
<a name="l00110"></a>00110 <span class="comment"> */</span>
<a name="l00111"></a>00111 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#ga2c2edd6a123d8ca2a6334fa8874b724d">apr_sdbm_lock</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db, <span class="keywordtype">int</span> type);
<a name="l00112"></a>00112 <span class="comment"></span>
<a name="l00113"></a>00113 <span class="comment">/**</span>
<a name="l00114"></a>00114 <span class="comment"> * Release an sdbm lock previously aquired by apr_sdbm_lock</span>
<a name="l00115"></a>00115 <span class="comment"> * @param db The database to unlock</span>
<a name="l00116"></a>00116 <span class="comment"> */</span>
<a name="l00117"></a>00117 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gab96a7e08ddac3cb6bff97a822b68de14">apr_sdbm_unlock</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db);
<a name="l00118"></a>00118 <span class="comment"></span>
<a name="l00119"></a>00119 <span class="comment">/**</span>
<a name="l00120"></a>00120 <span class="comment"> * Fetch an sdbm record value by key</span>
<a name="l00121"></a>00121 <span class="comment"> * @param db The database </span>
<a name="l00122"></a>00122 <span class="comment"> * @param value The value datum retrieved for this record</span>
<a name="l00123"></a>00123 <span class="comment"> * @param key The key datum to find this record</span>
<a name="l00124"></a>00124 <span class="comment"> */</span>
<a name="l00125"></a>00125 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#ga7d9eae450e9f9a2f1bcf626a3f8ca43f">apr_sdbm_fetch</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db,
<a name="l00126"></a>00126 <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> *value,
<a name="l00127"></a>00127 <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> key);
<a name="l00128"></a>00128 <span class="comment"></span>
<a name="l00129"></a>00129 <span class="comment">/**</span>
<a name="l00130"></a>00130 <span class="comment"> * Store an sdbm record value by key</span>
<a name="l00131"></a>00131 <span class="comment"> * @param db The database </span>
<a name="l00132"></a>00132 <span class="comment"> * @param key The key datum to store this record by</span>
<a name="l00133"></a>00133 <span class="comment"> * @param value The value datum to store in this record</span>
<a name="l00134"></a>00134 <span class="comment"> * @param opt The method used to store the record</span>
<a name="l00135"></a>00135 <span class="comment"> * <PRE></span>
<a name="l00136"></a>00136 <span class="comment"> * APR_SDBM_INSERT return an error if the record exists</span>
<a name="l00137"></a>00137 <span class="comment"> * APR_SDBM_REPLACE overwrite any existing record for key</span>
<a name="l00138"></a>00138 <span class="comment"> * </PRE></span>
<a name="l00139"></a>00139 <span class="comment"> */</span>
<a name="l00140"></a>00140 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gac12993b882c50afa0777945ea4a88572">apr_sdbm_store</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db, <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> key,
<a name="l00141"></a>00141 <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> value, <span class="keywordtype">int</span> opt);
<a name="l00142"></a>00142 <span class="comment"></span>
<a name="l00143"></a>00143 <span class="comment">/**</span>
<a name="l00144"></a>00144 <span class="comment"> * Delete an sdbm record value by key</span>
<a name="l00145"></a>00145 <span class="comment"> * @param db The database </span>
<a name="l00146"></a>00146 <span class="comment"> * @param key The key datum of the record to delete</span>
<a name="l00147"></a>00147 <span class="comment"> * @remark It is not an error to delete a non-existent record.</span>
<a name="l00148"></a>00148 <span class="comment"> */</span>
<a name="l00149"></a>00149 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#ga5744462c07c40d26c275beaeb902ff9c">apr_sdbm_delete</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db,
<a name="l00150"></a>00150 const <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> key);
<a name="l00151"></a>00151 <span class="comment"></span>
<a name="l00152"></a>00152 <span class="comment">/**</span>
<a name="l00153"></a>00153 <span class="comment"> * Retrieve the first record key from a dbm</span>
<a name="l00154"></a>00154 <span class="comment"> * @param db The database </span>
<a name="l00155"></a>00155 <span class="comment"> * @param key The key datum of the first record</span>
<a name="l00156"></a>00156 <span class="comment"> * @remark The keys returned are not ordered. To traverse the list of keys</span>
<a name="l00157"></a>00157 <span class="comment"> * for an sdbm opened with APR_SHARELOCK, the caller must use apr_sdbm_lock</span>
<a name="l00158"></a>00158 <span class="comment"> * prior to retrieving the first record, and hold the lock until after the</span>
<a name="l00159"></a>00159 <span class="comment"> * last call to apr_sdbm_nextkey.</span>
<a name="l00160"></a>00160 <span class="comment"> */</span>
<a name="l00161"></a>00161 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gae5410d9dc681393e597f492f30c6447f">apr_sdbm_firstkey</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db, <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> *key);
<a name="l00162"></a>00162 <span class="comment"></span>
<a name="l00163"></a>00163 <span class="comment">/**</span>
<a name="l00164"></a>00164 <span class="comment"> * Retrieve the next record key from an sdbm</span>
<a name="l00165"></a>00165 <span class="comment"> * @param db The database </span>
<a name="l00166"></a>00166 <span class="comment"> * @param key The key datum of the next record</span>
<a name="l00167"></a>00167 <span class="comment"> */</span>
<a name="l00168"></a>00168 APU_DECLARE(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#ga77d7f848ccb68e9f465a988d0af80911">apr_sdbm_nextkey</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db, <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> *key);
<a name="l00169"></a>00169 <span class="comment"></span>
<a name="l00170"></a>00170 <span class="comment">/**</span>
<a name="l00171"></a>00171 <span class="comment"> * Returns true if the sdbm database opened for read-only access</span>
<a name="l00172"></a>00172 <span class="comment"> * @param db The database to test</span>
<a name="l00173"></a>00173 <span class="comment"> */</span>
<a name="l00174"></a>00174 APU_DECLARE(<span class="keywordtype">int</span>) <a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gabad67008f83fd219173acc5abdd0b42d">apr_sdbm_rdonly</a>(<a class="code" href="group___a_p_r___util___d_b_m___s_d_b_m.html#gaf24cdea6e4884036a40484259efa68c6">apr_sdbm_t</a> *db);<span class="comment"></span>
<a name="l00175"></a>00175 <span class="comment">/** @} */</span>
<a name="l00176"></a>00176 <span class="preprocessor">#endif </span><span class="comment">/* APR_SDBM_H */</span>
</pre></div></div>
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