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<title>Apache Portable Runtime Utility Library: Optional Hook Functions</title>
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<h1>Optional Hook Functions<br>
<small>
[<a class="el" href="group___a_p_r___util___hook.html">Hook Functions</a>]</small>
</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap 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#g808d07f9a3e5df6517ba027972c79e4f">APR_OPTIONAL_HOOK</a>(ns, name, pfn, aszPre, aszSucc, nOrder)</td></tr>
<tr><td class="memItemLeft" nowrap 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#g3e6fa7b8e9ce140b26d8f6ce34e6ae82">APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL</a>(ns, link, ret, name, args_decl, args_use, ok, decline)</td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap 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#gff32812046580ae53b0368918374a3b6">apr_optional_hook_add</a> (const char *szName, void(*pfn)(void), const char *const *aszPre, const char *const *aszSucc, int nOrder)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ge7cfa7b32c41fb38eb19f0bba85abfeb"></a><!-- doxytag: member="APR_Util_OPT_HOOK::apr_optional_hook_get" ref="ge7cfa7b32c41fb38eb19f0bba85abfeb" args="(const char *szName)" -->
apr_array_header_t * </td><td class="memItemRight" valign="bottom"><b>apr_optional_hook_get</b> (const char *szName)</td></tr>
</table>
<hr><h2>Define Documentation</h2>
<a class="anchor" name="g3e6fa7b8e9ce140b26d8f6ce34e6ae82"></a><!-- doxytag: member="apr_optional_hooks.h::APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL" ref="g3e6fa7b8e9ce140b26d8f6ce34e6ae82" args="(ns, link, ret, name, args_decl, args_use, ok, decline)" -->
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<td class="memname">#define APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL </td>
<td>(</td>
<td class="paramtype">ns, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">link, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ret, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">name, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">args_decl, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">args_use, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ok, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">decline </td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
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<p>
<b>Value:</b><div class="fragment"><pre class="fragment">link##_DECLARE(ret) ns<span class="preprocessor">##_run_##name args_decl \</span>
<span class="preprocessor"> { \</span>
<span class="preprocessor"> ns##_LINK_##name##_t *pHook; \</span>
<span class="preprocessor"> int n; \</span>
<span class="preprocessor"> ret rv; \</span>
<span class="preprocessor"> apr_array_header_t *pHookArray=apr_optional_hook_get(#name); \</span>
<span class="preprocessor">\</span>
<span class="preprocessor"> if(!pHookArray) \</span>
<span class="preprocessor"> return ok; \</span>
<span class="preprocessor">\</span>
<span class="preprocessor"> pHook=(ns##_LINK_##name##_t *)pHookArray->elts; \</span>
<span class="preprocessor"> for(n=0 ; n < pHookArray->nelts ; ++n) \</span>
<span class="preprocessor"> { \</span>
<span class="preprocessor"> rv=(pHook[n].pFunc)args_use; \</span>
<span class="preprocessor">\</span>
<span class="preprocessor"> if(rv != ok && rv != decline) \</span>
<span class="preprocessor"> return rv; \</span>
<span class="preprocessor"> } \</span>
<span class="preprocessor"> return ok; \</span>
<span class="preprocessor"> }</span>
</pre></div>Implement an optional hook that runs until one of the functions returns something other than OK or DECLINE.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>ns</em> </td><td>The namespace prefix of the hook functions </td></tr>
<tr><td valign="top"></td><td valign="top"><em>link</em> </td><td>The linkage declaration prefix of the hook </td></tr>
<tr><td valign="top"></td><td valign="top"><em>ret</em> </td><td>The type of the return value of the hook </td></tr>
<tr><td valign="top"></td><td valign="top"><em>ret</em> </td><td>The type of the return value of the hook </td></tr>
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>The name of the hook </td></tr>
<tr><td valign="top"></td><td valign="top"><em>args_decl</em> </td><td>The declaration of the arguments for the hook </td></tr>
<tr><td valign="top"></td><td valign="top"><em>args_use</em> </td><td>The names for the arguments for the hook </td></tr>
<tr><td valign="top"></td><td valign="top"><em>ok</em> </td><td>Success value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>decline</em> </td><td>Decline value </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="g808d07f9a3e5df6517ba027972c79e4f"></a><!-- doxytag: member="apr_optional_hooks.h::APR_OPTIONAL_HOOK" ref="g808d07f9a3e5df6517ba027972c79e4f" args="(ns, name, pfn, aszPre, aszSucc, nOrder)" -->
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<td class="memname">#define APR_OPTIONAL_HOOK </td>
<td>(</td>
<td class="paramtype">ns, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">name, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">pfn, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">aszPre, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">aszSucc, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">nOrder </td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
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<p>
<b>Value:</b><div class="fragment"><pre class="fragment"><span class="keywordflow">do</span> { \
ns##_HOOK_##name##_t *apu__hook = pfn; \
<a class="code" href="group___a_p_r___util___o_p_t___h_o_o_k.html#gff32812046580ae53b0368918374a3b6">apr_optional_hook_add</a>(#name,(<span class="keywordtype">void</span> (*)(<span class="keywordtype">void</span>))apu__hook,aszPre, aszSucc, nOrder); \
} <span class="keywordflow">while</span> (0)
</pre></div>Hook to an optional hook.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>ns</em> </td><td>The namespace prefix of the hook functions </td></tr>
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>The name of the hook </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pfn</em> </td><td>A pointer to a function that will be called </td></tr>
<tr><td valign="top"></td><td valign="top"><em>aszPre</em> </td><td>a NULL-terminated array of strings that name modules whose hooks should precede this one </td></tr>
<tr><td valign="top"></td><td valign="top"><em>aszSucc</em> </td><td>a NULL-terminated array of strings that name modules whose hooks should succeed this one </td></tr>
<tr><td valign="top"></td><td valign="top"><em>nOrder</em> </td><td>an integer determining order before honouring aszPre and aszSucc (for example HOOK_MIDDLE) </td></tr>
</table>
</dl>
</div>
</div><p>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="gff32812046580ae53b0368918374a3b6"></a><!-- doxytag: member="apr_optional_hooks.h::apr_optional_hook_add" ref="gff32812046580ae53b0368918374a3b6" args="(const char *szName, void(*pfn)(void), const char *const *aszPre, const char *const *aszSucc, int nOrder)" -->
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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><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
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<p>
Function to implemnt the APR_OPTIONAL_HOOK Macro
</div>
</div><p>
<hr size="1"><address style="text-align: right;"><small>Generated on Thu Jan 24 02:22:55 2008 for Apache Portable Runtime Utility Library by
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