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<section id="krb5-set-trace-callback-specify-a-callback-function-for-trace-events">
<h1>krb5_set_trace_callback - Specify a callback function for trace events.<a class="headerlink" href="#krb5-set-trace-callback-specify-a-callback-function-for-trace-events" title="Permalink to this headline">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_set_trace_callback">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code"><span class="n"><span class="pre">krb5_error_code</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">krb5_set_trace_callback</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context"><span class="n"><span class="pre">krb5_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">context</span></span>, <a class="reference internal" href="../types/krb5_trace_callback.html#c.krb5_trace_callback" title="krb5_trace_callback"><span class="n"><span class="pre">krb5_trace_callback</span></span></a><span class="w"> </span><span class="n"><span class="pre">fn</span></span>, <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">cb_data</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_set_trace_callback" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param</dt>
<dd class="field-odd"><p><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[in]</strong> <strong>fn</strong> - Callback function</p>
<p><strong>[in]</strong> <strong>cb_data</strong> - Callback data</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">return</dt>
<dd class="field-odd"><ul class="simple">
<li><p>Returns KRB5_TRACE_NOSUPP if tracing is not supported in the library (unless fn is NULL).</p></li>
</ul>
</dd>
</dl>
<p>Specify a callback for trace events occurring in krb5 operations performed within <em>context</em> . <em>fn</em> will be invoked with <em>context</em> as the first argument, <em>cb_data</em> as the last argument, and a pointer to a krb5_trace_info as the second argument. If the trace callback is reset via this function or <em>context</em> is destroyed, <em>fn</em> will be invoked with a NULL second argument so it can clean up <em>cb_data</em> . Supply a NULL value for <em>fn</em> to disable trace callbacks within <em>context</em> .</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This function overrides the information passed through the <em>KRB5_TRACE</em> environment variable.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>New in 1.9</p>
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