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-<!-- This manual is last updated 4 March 2015 for version
-3.5.4 of GnuTLS.
-
-Copyright (C) 2001-2015 Free Software Foundation, Inc.\\
-Copyright (C) 2001-2015 Nikos Mavrogiannopoulos
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-<title>GnuTLS 3.5.4: Checking for an alert</title>
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-<link href="X_002e509-certificate-parsing-example.html#X_002e509-certificate-parsing-example" rel="next" title="X.509 certificate parsing example">
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-<a name="Checking-for-an-alert"></a>
-<div class="header">
-<p>
-Next: <a href="X_002e509-certificate-parsing-example.html#X_002e509-certificate-parsing-example" accesskey="n" rel="next">X.509 certificate parsing example</a>, Up: <a href="Miscellaneous-examples.html#Miscellaneous-examples" accesskey="u" rel="up">Miscellaneous examples</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
-</div>
-<hr>
-<a name="Checking-for-an-alert-1"></a>
-<h4 class="subsection">7.4.1 Checking for an alert</h4>
-
-<p>This is a function that checks if an alert has been received in the
-current session.
-</p>
-<pre class="verbatim">/* This example code is placed in the public domain. */
-
-#ifdef HAVE_CONFIG_H
-#include &lt;config.h&gt;
-#endif
-
-#include &lt;stdio.h&gt;
-#include &lt;stdlib.h&gt;
-#include &lt;gnutls/gnutls.h&gt;
-
-#include &quot;examples.h&quot;
-
-/* This function will check whether the given return code from
- * a gnutls function (recv/send), is an alert, and will print
- * that alert.
- */
-void check_alert(gnutls_session_t session, int ret)
-{
- int last_alert;
-
- if (ret == GNUTLS_E_WARNING_ALERT_RECEIVED
- || ret == GNUTLS_E_FATAL_ALERT_RECEIVED) {
- last_alert = gnutls_alert_get(session);
-
- /* The check for renegotiation is only useful if we are
- * a server, and we had requested a rehandshake.
- */
- if (last_alert == GNUTLS_A_NO_RENEGOTIATION &amp;&amp;
- ret == GNUTLS_E_WARNING_ALERT_RECEIVED)
- printf(&quot;* Received NO_RENEGOTIATION alert. &quot;
- &quot;Client Does not support renegotiation.\n&quot;);
- else
- printf(&quot;* Received alert '%d': %s.\n&quot;, last_alert,
- gnutls_alert_get_name(last_alert));
- }
-}
-</pre>
-
-
-
-</body>
-</html>