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<title>Apache Portable Runtime Utility Library: Optional Hook Functions</title>
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<a href="#define-members">Macros</a> |
<a href="#func-members">Functions</a> </div>
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<div class="title">Optional Hook Functions<div class="ingroups"><a class="el" href="group___a_p_r___util.html">APR Utility Functions</a> » <a class="el" href="group___a_p_r___util___hook.html">Hook Functions</a></div></div> </div>
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Collaboration diagram for Optional Hook Functions:</div>
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<div class="center"><img src="group___a_p_r___util___o_p_t___h_o_o_k.png" border="0" usemap="#group______a__p__r______util______o__p__t______h__o__o__k" alt=""/></div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ga808d07f9a3e5df6517ba027972c79e4f"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___o_p_t___h_o_o_k.html#ga808d07f9a3e5df6517ba027972c79e4f">APR_OPTIONAL_HOOK</a>(ns, name, pfn, aszPre, aszSucc, nOrder)</td></tr>
<tr class="separator:ga808d07f9a3e5df6517ba027972c79e4f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga3e6fa7b8e9ce140b26d8f6ce34e6ae82"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___o_p_t___h_o_o_k.html#ga3e6fa7b8e9ce140b26d8f6ce34e6ae82">APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL</a>(ns, link, ret, name, args_decl, args_use, ok, decline)</td></tr>
<tr class="separator:ga3e6fa7b8e9ce140b26d8f6ce34e6ae82"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaff32812046580ae53b0368918374a3b6"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___o_p_t___h_o_o_k.html#gaff32812046580ae53b0368918374a3b6">apr_optional_hook_add</a> (const char *szName, void(*pfn)(void), const char *const *aszPre, const char *const *aszSucc, int nOrder)</td></tr>
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<tr class="memitem:gae7cfa7b32c41fb38eb19f0bba85abfeb"><td class="memItemLeft" align="right" valign="top"><a id="gae7cfa7b32c41fb38eb19f0bba85abfeb"></a>
apr_array_header_t * </td><td class="memItemRight" valign="bottom"><b>apr_optional_hook_get</b> (const char *szName)</td></tr>
<tr class="separator:gae7cfa7b32c41fb38eb19f0bba85abfeb"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a id="ga3e6fa7b8e9ce140b26d8f6ce34e6ae82"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga3e6fa7b8e9ce140b26d8f6ce34e6ae82">◆ </a></span>APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL</h2>
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<td class="memname">#define APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">ns, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">link, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">ret, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">name, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">args_decl, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">args_use, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">ok, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">decline </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<b>Value:</b><div class="fragment"><div class="line">link##_DECLARE(ret) ns##_run_##name args_decl \</div>
<div class="line"> { \</div>
<div class="line"> ns##_LINK_##name##_t *pHook; \</div>
<div class="line"> int n; \</div>
<div class="line"> ret rv; \</div>
<div class="line"> apr_array_header_t *pHookArray=apr_optional_hook_get(#name); \</div>
<div class="line">\</div>
<div class="line"> if(!pHookArray) \</div>
<div class="line"> return ok; \</div>
<div class="line">\</div>
<div class="line"> pHook=(ns##_LINK_##name##_t *)pHookArray->elts; \</div>
<div class="line"> <span class="keywordflow">for</span>(n=0 ; n < pHookArray->nelts ; ++n) \</div>
<div class="line"> { \</div>
<div class="line"> rv=(pHook[n].pFunc)args_use; \</div>
<div class="line">\</div>
<div class="line"> if(rv != ok && rv != decline) \</div>
<div class="line"> return rv; \</div>
<div class="line"> } \</div>
<div class="line"> return ok; \</div>
<div class="line"> }</div>
</div><!-- fragment --><p>Implement an optional hook that runs until one of the functions returns something other than OK or DECLINE.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ns</td><td>The namespace prefix of the hook functions </td></tr>
<tr><td class="paramname">link</td><td>The linkage declaration prefix of the hook </td></tr>
<tr><td class="paramname">ret</td><td>The type of the return value of the hook </td></tr>
<tr><td class="paramname">ret</td><td>The type of the return value of the hook </td></tr>
<tr><td class="paramname">name</td><td>The name of the hook </td></tr>
<tr><td class="paramname">args_decl</td><td>The declaration of the arguments for the hook </td></tr>
<tr><td class="paramname">args_use</td><td>The names for the arguments for the hook </td></tr>
<tr><td class="paramname">ok</td><td>Success value </td></tr>
<tr><td class="paramname">decline</td><td>Decline value </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga808d07f9a3e5df6517ba027972c79e4f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga808d07f9a3e5df6517ba027972c79e4f">◆ </a></span>APR_OPTIONAL_HOOK</h2>
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<td class="memname">#define APR_OPTIONAL_HOOK</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">ns, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">name, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">pfn, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">aszPre, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">aszSucc, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">nOrder </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<b>Value:</b><div class="fragment"><div class="line"> <span class="keywordflow">do</span> { \</div>
<div class="line"> ns##_HOOK_##name##_t *apu__hook = pfn; \</div>
<div class="line"> apr_optional_hook_add(#name,(<span class="keywordtype">void</span> (*)(<span class="keywordtype">void</span>))apu__hook,aszPre, aszSucc, nOrder); \</div>
<div class="line">} <span class="keywordflow">while</span> (0)</div>
</div><!-- fragment --><p>Hook to an optional hook.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ns</td><td>The namespace prefix of the hook functions </td></tr>
<tr><td class="paramname">name</td><td>The name of the hook </td></tr>
<tr><td class="paramname">pfn</td><td>A pointer to a function that will be called </td></tr>
<tr><td class="paramname">aszPre</td><td>a NULL-terminated array of strings that name modules whose hooks should precede this one </td></tr>
<tr><td class="paramname">aszSucc</td><td>a NULL-terminated array of strings that name modules whose hooks should succeed this one </td></tr>
<tr><td class="paramname">nOrder</td><td>an integer determining order before honouring aszPre and aszSucc (for example HOOK_MIDDLE) </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="gaff32812046580ae53b0368918374a3b6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaff32812046580ae53b0368918374a3b6">◆ </a></span>apr_optional_hook_add()</h2>
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<td class="memname">void apr_optional_hook_add </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>szName</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void(*)(void) </td>
<td class="paramname"><em>pfn</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *const * </td>
<td class="paramname"><em>aszPre</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *const * </td>
<td class="paramname"><em>aszSucc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>nOrder</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Function to implement the APR_OPTIONAL_HOOK Macro </p>
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