ex_data() set the extra data pointer passed to the <b>ex</b> parameter of the callback. This value is passed to the callback verbatim and can be set to any convenient application specific value.</p>

<h1 id="DEFAULT-CALLBACK-BEHAVIOUR">DEFAULT CALLBACK BEHAVIOUR</h1>

<p>If an application doesn&#39;t set its own security callback the default callback is used. It is intended to provide sane defaults. The meaning of each level is described below.</p>

<dl>

<dt id="Level-0"><b>Level 0</b></dt>
<dd>

<p>Everyt