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  <title>FIDO_DEV_OPEN(3)</title>
</head>
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<table class="head">
  <tr>
    <td class="head-ltitle">FIDO_DEV_OPEN(3)</td>
    <td class="head-vol">FreeBSD Library Functions Manual</td>
    <td class="head-rtitle">FIDO_DEV_OPEN(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_dev_open</code>,
  <code class="Nm">fido_dev_open_with_info</code>,
  <code class="Nm">fido_dev_close</code>,
  <code class="Nm">fido_dev_cancel</code>, <code class="Nm">fido_dev_new</code>,
  <code class="Nm">fido_dev_new_with_info</code>,
  <code class="Nm">fido_dev_free</code>,
  <code class="Nm">fido_dev_force_fido2</code>,
  <code class="Nm">fido_dev_force_u2f</code>,
  <code class="Nm">fido_dev_is_fido2</code>,
  <code class="Nm">fido_dev_is_winhello</code>,
  <code class="Nm">fido_dev_supports_credman</code>,
  <code class="Nm">fido_dev_supports_cred_prot</code>,
  <code class="Nm">fido_dev_supports_permissions</code>,
  <code class="Nm">fido_dev_supports_pin</code>,
  <code class="Nm">fido_dev_supports_uv</code>,
  <code class="Nm">fido_dev_has_pin</code>,
  <code class="Nm">fido_dev_has_uv</code>,
  <code class="Nm">fido_dev_protocol</code>,
  <code class="Nm">fido_dev_build</code>,
  <code class="Nm">fido_dev_flags</code>,
  <code class="Nm">fido_dev_major</code>, <code class="Nm">fido_dev_minor</code>
  &#x2014;
<div class="Nd">FIDO2 device open/close and related functions</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>
<p class="Pp"><var class="Ft">int</var>
  <br/>
  <code class="Fn">fido_dev_open</code>(<var class="Fa" style="white-space: nowrap;">fido_dev_t
    *dev</var>, <var class="Fa" style="white-space: nowrap;">const char
    *path</var>);</p>
<p class="Pp"><var class="Ft">int</var>
  <br/>
  <code class="Fn">fido_dev_open_with_info</code>(<var class="Fa" style="white-space: nowrap;">fido_dev_t
    *dev</var>);</p>
<p class="Pp"><var class="Ft">int</var>
  <br/>
  <code class="Fn">fido_dev_close</code>(<var class="Fa" style="white-space: nowrap;">fido_dev_t
    *dev</var>);</p>
<p class="Pp"><var class="Ft">int</var>
  <br/>
  <code class="Fn">fido_dev_cancel</code>(<var class="Fa" style="white-space: nowrap;">fido_dev_t
    *dev</var>);</p>
<p class="Pp"><var class="Ft">fido_dev_t *</var>
  <br/>
  <code class="Fn">fido_dev_new</code>(<var class="Fa" style="white-space: nowrap;">void</var>);</p>
<p class="Pp"><var class="Ft">fido_dev_t *</var>
  <br/>
  <code class="Fn">fido_dev_new_with_info</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_info_t *</var>);</p>
<p class="Pp"><var class="Ft">void</var>
  <br/>
  <code class="Fn">fido_dev_free</code>(<var class="Fa" style="white-space: nowrap;">fido_dev_t
    **dev_p</var>);</p>
<p class="Pp"><var class="Ft">void</var>
  <br/>
  <code class="Fn">fido_dev_force_fido2</code>(<var class="Fa" style="white-space: nowrap;">fido_dev_t
    *dev</var>);</p>
<p class="Pp"><var class="Ft">void</var>
  <br/>
  <code class="Fn">fido_dev_force_u2f</code>(<var class="Fa" style="white-space: nowrap;">fido_dev_t
    *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_is_fido2</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_is_winhello</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_supports_credman</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_supports_cred_prot</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_supports_permissions</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_supports_pin</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_supports_uv</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_has_pin</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">bool</var>
  <br/>
  <code class="Fn">fido_dev_has_uv</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">uint8_t</var>
  <br/>
  <code class="Fn">fido_dev_protocol</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">uint8_t</var>
  <br/>
  <code class="Fn">fido_dev_build</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">uint8_t</var>
  <br/>
  <code class="Fn">fido_dev_flags</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">uint8_t</var>
  <br/>
  <code class="Fn">fido_dev_major</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
<p class="Pp"><var class="Ft">uint8_t</var>
  <br/>
  <code class="Fn">fido_dev_minor</code>(<var class="Fa" style="white-space: nowrap;">const
    fido_dev_t *dev</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
The <code class="Fn">fido_dev_open</code>() function opens the device pointed to
  by <var class="Fa">path</var>, where <var class="Fa">dev</var> is a freshly
  allocated or otherwise closed <var class="Vt">fido_dev_t</var>. If
  <var class="Fa">dev</var> claims to be FIDO2, <i class="Em">libfido2</i> will
  attempt to speak FIDO2 to <var class="Fa">dev</var>. If that fails,
  <i class="Em">libfido2</i> will fallback to U2F unless the
  <code class="Dv">FIDO_DISABLE_U2F_FALLBACK</code> flag was set in
  <a class="Xr" href="fido_init.html">fido_init(3)</a>.
<p class="Pp">The <code class="Fn">fido_dev_open_with_info</code>() function
    opens <var class="Fa">dev</var> as previously allocated using
    <code class="Fn">fido_dev_new_with_info</code>().</p>
<p class="Pp">The <code class="Fn">fido_dev_close</code>() function closes the
    device represented by <var class="Fa">dev</var>. If
    <var class="Fa">dev</var> is already closed,
    <code class="Fn">fido_dev_close</code>() is a NOP.</p>
<p class="Pp">The <code class="Fn">fido_dev_cancel</code>() function cancels any
    pending requests on <var class="Fa">dev</var>.</p>
<p class="Pp">The <code class="Fn">fido_dev_new</code>() function returns a
    pointer to a newly allocated, empty <var class="Vt">fido_dev_t</var>. If
    memory cannot be allocated, NULL is returned.</p>
<p class="Pp">The <code class="Fn">fido_dev_new_with_info</code>() function
    returns a pointer to a newly allocated <var class="Vt">fido_dev_t</var> with
    <var class="Vt">fido_dev_info_t</var> parameters, for use with
    <a class="Xr" href="fido_dev_info_manifest.html">fido_dev_info_manifest(3)</a>
    and <code class="Fn">fido_dev_open_with_info</code>(). If memory cannot be
    allocated, NULL is returned.</p>
<p class="Pp">The <code class="Fn">fido_dev_free</code>() function releases the
    memory backing <var class="Fa">*dev_p</var>, where
    <var class="Fa">*dev_p</var> must have been previously allocated by
    <code class="Fn">fido_dev_new</code>(). On return,
    <var class="Fa">*dev_p</var> is set to NULL. Either
    <var class="Fa">dev_p</var> or <var class="Fa">*dev_p</var> may be NULL, in
    which case <code class="Fn">fido_dev_free</code>() is a NOP.</p>
<p class="Pp">The <code class="Fn">fido_dev_force_fido2</code>() function can be
    used to force CTAP2 communication with <var class="Fa">dev</var>, where
    <var class="Fa">dev</var> is an open device.</p>
<p class="Pp">The <code class="Fn">fido_dev_force_u2f</code>() function can be
    used to force CTAP1 (U2F) communication with <var class="Fa">dev</var>,
    where <var class="Fa">dev</var> is an open device.</p>
<p class="Pp">The <code class="Fn">fido_dev_is_fido2</code>() function returns
    <code class="Dv">true</code> if <var class="Fa">dev</var> is a FIDO2
  device.</p>
<p class="Pp">The <code class="Fn">fido_dev_is_winhello</code>() function
    returns <code class="Dv">true</code> if <var class="Fa">dev</var> is a
    Windows Hello device.</p>
<p class="Pp">The <code class="Fn">fido_dev_supports_credman</code>() function
    returns <code class="Dv">true</code> if <var class="Fa">dev</var> supports
    CTAP 2.1 Credential Management.</p>
<p class="Pp">The <code class="Fn">fido_dev_supports_cred_prot</code>() function
    returns <code class="Dv">true</code> if <var class="Fa">dev</var> supports
    CTAP 2.1 Credential Protection.</p>
<p class="Pp">The <code class="Fn">fido_dev_supports_permissions</code>()
    function returns <code class="Dv">true</code> if <var class="Fa">dev</var>
    supports CTAP 2.1 UV token permissions.</p>
<p class="Pp">The <code class="Fn">fido_dev_supports_pin</code>() function
    returns <code class="Dv">true</code> if <var class="Fa">dev</var> supports
    CTAP 2.0 Client PINs.</p>
<p class="Pp">The <code class="Fn">fido_dev_supports_uv</code>() function
    returns <code class="Dv">true</code> if <var class="Fa">dev</var> supports a
    built-in user verification method.</p>
<p class="Pp">The <code class="Fn">fido_dev_has_pin</code>() function returns
    <code class="Dv">true</code> if <var class="Fa">dev</var> has a CTAP 2.0
    Client PIN set.</p>
<p class="Pp">The <code class="Fn">fido_dev_has_uv</code>() function returns
    <code class="Dv">true</code> if <var class="Fa">dev</var> supports built-in
    user verification and its user verification feature is configured.</p>
<p class="Pp">The <code class="Fn">fido_dev_protocol</code>() function returns
    the CTAPHID protocol version identifier of <var class="Fa">dev</var>.</p>
<p class="Pp">The <code class="Fn">fido_dev_build</code>() function returns the
    CTAPHID build version number of <var class="Fa">dev</var>.</p>
<p class="Pp">The <code class="Fn">fido_dev_flags</code>() function returns the
    CTAPHID capabilities flags of <var class="Fa">dev</var>.</p>
<p class="Pp">The <code class="Fn">fido_dev_major</code>() function returns the
    CTAPHID major version number of <var class="Fa">dev</var>.</p>
<p class="Pp">The <code class="Fn">fido_dev_minor</code>() function returns the
    CTAPHID minor version number of <var class="Fa">dev</var>.</p>
<p class="Pp">For the format and meaning of the CTAPHID parameters returned by
    functions above, please refer to the FIDO Client to Authenticator Protocol
    (CTAP) specification.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
  VALUES</a></h1>
On success, <code class="Fn">fido_dev_open</code>(),
  <code class="Fn">fido_dev_open_with_info</code>(), and
  <code class="Fn">fido_dev_close</code>() return
  <code class="Dv">FIDO_OK</code>. On error, a different error code defined in
  <code class="In">&lt;<a class="In">fido/err.h</a>&gt;</code> is returned.
</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_dev_info_manifest.html">fido_dev_info_manifest(3)</a>,
  <a class="Xr" href="fido_dev_set_io_functions.html">fido_dev_set_io_functions(3)</a>,
  <a class="Xr" href="fido_init.html">fido_init(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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