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  <title>FIDO_INIT(3)</title>
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<table class="head">
  <tr>
    <td class="head-ltitle">FIDO_INIT(3)</td>
    <td class="head-vol">FreeBSD Library Functions Manual</td>
    <td class="head-rtitle">FIDO_INIT(3)</td>
  </tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<code class="Nm">fido_init</code>, <code class="Nm">fido_set_log_handler</code>
  &#x2014;
<div class="Nd">initialise the FIDO2 library</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<code class="In">#include &lt;<a class="In">fido.h</a>&gt;</code>
<div class="Bd Pp">
<pre>
typedef void fido_log_handler_t(const char *);
</pre>
</div>
<p class="Pp">
  <br/>
  <var class="Ft">void</var>
  <br/>
  <code class="Fn">fido_init</code>(<var class="Fa" style="white-space: nowrap;">int
    flags</var>);</p>
<p class="Pp"><var class="Ft">void</var>
  <br/>
  <code class="Fn">fido_set_log_handler</code>(<var class="Fa" style="white-space: nowrap;">fido_log_handler_t
    *handler</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
The <code class="Fn">fido_init</code>() function initialises the
  <i class="Em">libfido2</i> library. Its invocation must precede that of any
  other <i class="Em">libfido2</i> function in the context of the executing
  thread.
<p class="Pp">If <code class="Dv">FIDO_DEBUG</code> is set in
    <var class="Fa">flags</var>, then debug output will be emitted by
    <i class="Em">libfido2</i> on <i class="Em">stderr</i>. Alternatively, the
    <code class="Ev">FIDO_DEBUG</code> environment variable may be set.</p>
<p class="Pp">If <code class="Dv">FIDO_DISABLE_U2F_FALLBACK</code> is set in
    <var class="Fa">flags</var>, then <i class="Em">libfido2</i> will not
    fallback to U2F in
    <a class="Xr" href="fido_dev_open.html">fido_dev_open(3)</a> if a device
    claims to support FIDO2 but fails to respond to a CTAP 2.0 greeting.</p>
<p class="Pp">The <code class="Fn">fido_set_log_handler</code>() function causes
    <var class="Fa">handler</var> to be called for each log line generated in
    the context of the executing thread. Lines passed to
    <var class="Fa">handler</var> include a trailing newline character and are
    not printed by <i class="Em">libfido2</i> on <i class="Em">stderr</i>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
  ALSO</a></h1>
<a class="Xr" href="fido_assert_new.html">fido_assert_new(3)</a>,
  <a class="Xr" href="fido_cred_new.html">fido_cred_new(3)</a>,
  <a class="Xr" href="fido_dev_info_manifest.html">fido_dev_info_manifest(3)</a>,
  <a class="Xr" href="fido_dev_open.html">fido_dev_open(3)</a>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">May 25, 2018</td>
    <td class="foot-os">Yubico&#x00A0;AB</td>
  </tr>
</table>
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