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<a href="#define-members">Macros</a> </div>
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<div class="title">Hook probe capability<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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<p>APR hooks provide a trace probe capability for capturing the flow of control and return values with hooks.
<a href="#details">More...</a></p>
<div class="dynheader">
Collaboration diagram for Hook probe capability:</div>
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<div class="center"><img src="group__apr__hook__probes.png" border="0" usemap="#group____apr____hook____probes" 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:ga258d03fb4cf228fcb9d2fa094625ffaf"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__hook__probes.html#ga258d03fb4cf228fcb9d2fa094625ffaf">APR_HOOK_INT_DCL_UD</a></td></tr>
<tr class="separator:ga258d03fb4cf228fcb9d2fa094625ffaf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga320422eebccc41f9329e34e11939e302"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__hook__probes.html#ga320422eebccc41f9329e34e11939e302">APR_HOOK_PROBE_ENTRY</a>(ud, ns, name, args)</td></tr>
<tr class="separator:ga320422eebccc41f9329e34e11939e302"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab3017efe0bb66b97b6b7931245211692"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__hook__probes.html#gab3017efe0bb66b97b6b7931245211692">APR_HOOK_PROBE_RETURN</a>(ud, ns, name, rv, args)</td></tr>
<tr class="separator:gab3017efe0bb66b97b6b7931245211692"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga030df3d86fe087857b32388e01ad3928"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__hook__probes.html#ga030df3d86fe087857b32388e01ad3928">APR_HOOK_PROBE_INVOKE</a>(ud, ns, name, src, args)</td></tr>
<tr class="separator:ga030df3d86fe087857b32388e01ad3928"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5793578cb2da7815b20b9a87c281ed7c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__hook__probes.html#ga5793578cb2da7815b20b9a87c281ed7c">APR_HOOK_PROBE_COMPLETE</a>(ud, ns, name, src, rv, args)</td></tr>
<tr class="separator:ga5793578cb2da7815b20b9a87c281ed7c"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>APR hooks provide a trace probe capability for capturing the flow of control and return values with hooks. </p>
<p>In order to use this facility, the application must define the symbol APR_HOOK_PROBES_ENABLED and the four APR_HOOK_PROBE_ macros described below before including <a class="el" href="apr__hooks_8h.html" title="Apache hook functions.">apr_hooks.h</a> in files that use the APR_IMPLEMENT_EXTERNAL_HOOK_* macros.</p>
<p>This probe facility is not provided for APR optional hooks. </p>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a id="ga258d03fb4cf228fcb9d2fa094625ffaf"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga258d03fb4cf228fcb9d2fa094625ffaf">◆ </a></span>APR_HOOK_INT_DCL_UD</h2>
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<td class="memname">#define APR_HOOK_INT_DCL_UD</td>
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<p>internal implementation detail to avoid the ud declaration when hook probes are not used </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5793578cb2da7815b20b9a87c281ed7c">◆ </a></span>APR_HOOK_PROBE_COMPLETE</h2>
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<td class="memname">#define APR_HOOK_PROBE_COMPLETE</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">ud, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">ns, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">name, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">src, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">rv, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">args </td>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>User-defined hook probe macro that is invoked after calling a hook function. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ud</td><td>A void * user data field that was filled in by the user- provided <a class="el" href="group__apr__hook__probes.html#ga320422eebccc41f9329e34e11939e302">APR_HOOK_PROBE_ENTRY()</a>. </td></tr>
<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">src</td><td>The value of apr_hook_debug_current at the time the function was hooked (usually the source file implementing the hook function). </td></tr>
<tr><td class="paramname">rv</td><td>The return value of the hook function, or 0 if the hook is void. </td></tr>
<tr><td class="paramname">args</td><td>The argument list to the hook functions, with enclosing parens. </td></tr>
</table>
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<h2 class="memtitle"><span class="permalink"><a href="#ga320422eebccc41f9329e34e11939e302">◆ </a></span>APR_HOOK_PROBE_ENTRY</h2>
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<td class="memname">#define APR_HOOK_PROBE_ENTRY</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">ud, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">ns, </td>
</tr>
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<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 </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>User-defined hook probe macro that is invoked when the hook is run, before calling any hook functions. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ud</td><td>A void * user data field that should be filled in by this macro, and will be provided to the other hook probe macros. </td></tr>
<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">args</td><td>The argument list to the hook functions, with enclosing parens. </td></tr>
</table>
</dd>
</dl>
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</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga030df3d86fe087857b32388e01ad3928">◆ </a></span>APR_HOOK_PROBE_INVOKE</h2>
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<td class="memname">#define APR_HOOK_PROBE_INVOKE</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">ud, </td>
</tr>
<tr>
<td class="paramkey"></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">src, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">args </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
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<p>User-defined hook probe macro that is invoked before calling a hook function. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ud</td><td>A void * user data field that was filled in by the user- provided <a class="el" href="group__apr__hook__probes.html#ga320422eebccc41f9329e34e11939e302">APR_HOOK_PROBE_ENTRY()</a>. </td></tr>
<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">src</td><td>The value of apr_hook_debug_current at the time the function was hooked (usually the source file implementing the hook function). </td></tr>
<tr><td class="paramname">args</td><td>The argument list to the hook functions, with enclosing parens. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gab3017efe0bb66b97b6b7931245211692">◆ </a></span>APR_HOOK_PROBE_RETURN</h2>
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<td class="memname">#define APR_HOOK_PROBE_RETURN</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">ud, </td>
</tr>
<tr>
<td class="paramkey"></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">rv, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">args </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<p>User-defined hook probe macro that is invoked after the hook has run. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ud</td><td>A void * user data field that was filled in by the user- provided <a class="el" href="group__apr__hook__probes.html#ga320422eebccc41f9329e34e11939e302">APR_HOOK_PROBE_ENTRY()</a>. </td></tr>
<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">rv</td><td>The return value of the hook, or 0 if the hook is void. </td></tr>
<tr><td class="paramname">args</td><td>The argument list to the hook functions, with enclosing parens. </td></tr>
</table>
</dd>
</dl>
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