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<div class="refentry" title="udev_enumerate">
<a name="libudev-udev-enumerate"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libudev-udev-enumerate.top_of_page"></a>udev_enumerate</span></h2>
<p>udev_enumerate — lookup and sort sys devices</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv" title="Synopsis">
<a name="libudev-udev-enumerate.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct <a class="link" href="libudev-udev-enumerate.html#udev-enumerate" title="struct udev_enumerate">udev_enumerate</a>;
struct <a class="link" href="libudev-udev-enumerate.html#udev-enumerate" title="struct udev_enumerate"><span class="returnvalue">udev_enumerate</span></a> * <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-ref" title="udev_enumerate_ref ()">udev_enumerate_ref</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-unref" title="udev_enumerate_unref ()">udev_enumerate_unref</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);
struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> * <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-get-udev" title="udev_enumerate_get_udev ()">udev_enumerate_get_udev</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);
struct <a class="link" href="libudev-udev-enumerate.html#udev-enumerate" title="struct udev_enumerate"><span class="returnvalue">udev_enumerate</span></a> * <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-new" title="udev_enumerate_new ()">udev_enumerate_new</a> (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-match-subsystem" title="udev_enumerate_add_match_subsystem ()">udev_enumerate_add_match_subsystem</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-nomatch-subsystem" title="udev_enumerate_add_nomatch_subsystem ()">udev_enumerate_add_nomatch_subsystem</a>
(<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-match-sysattr" title="udev_enumerate_add_match_sysattr ()">udev_enumerate_add_match_sysattr</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-nomatch-sysattr" title="udev_enumerate_add_nomatch_sysattr ()">udev_enumerate_add_nomatch_sysattr</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-match-property" title="udev_enumerate_add_match_property ()">udev_enumerate_add_match_property</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *property</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-match-tag" title="udev_enumerate_add_match_tag ()">udev_enumerate_add_match_tag</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *tag</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-match-sysname" title="udev_enumerate_add_match_sysname ()">udev_enumerate_add_match_sysname</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *sysname</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-add-syspath" title="udev_enumerate_add_syspath ()">udev_enumerate_add_syspath</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *syspath</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-scan-devices" title="udev_enumerate_scan_devices ()">udev_enumerate_scan_devices</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-scan-subsystems" title="udev_enumerate_scan_subsystems ()">udev_enumerate_scan_subsystems</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);
struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * <a class="link" href="libudev-udev-enumerate.html#udev-enumerate-get-list-entry" title="udev_enumerate_get_list_entry ()">udev_enumerate_get_list_entry</a> (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="libudev-udev-enumerate.description"></a><h2>Description</h2>
<p>
Lookup devices in the sys filesystem, filter devices by properties,
and return a sorted list of devices.
</p>
</div>
<div class="refsect1" title="Details">
<a name="libudev-udev-enumerate.details"></a><h2>Details</h2>
<div class="refsect2" title="struct udev_enumerate">
<a name="udev-enumerate"></a><h3>struct udev_enumerate</h3>
<pre class="programlisting">struct udev_enumerate;</pre>
<p>
Opaque object representing one device lookup/sort context.
</p>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_ref ()">
<a name="udev-enumerate-ref"></a><h3>udev_enumerate_ref ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev-enumerate.html#udev-enumerate" title="struct udev_enumerate"><span class="returnvalue">udev_enumerate</span></a> * udev_enumerate_ref (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);</pre>
<p>
Take a reference of a enumeration context.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the passed enumeration context
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_unref ()">
<a name="udev-enumerate-unref"></a><h3>udev_enumerate_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> udev_enumerate_unref (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);</pre>
<p>
Drop a reference of an enumeration context. If the refcount reaches zero,
all resources of the enumeration context will be released.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_get_udev ()">
<a name="udev-enumerate-get-udev"></a><h3>udev_enumerate_get_udev ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> * udev_enumerate_get_udev (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the udev library context.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_new ()">
<a name="udev-enumerate-new"></a><h3>udev_enumerate_new ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev-enumerate.html#udev-enumerate" title="struct udev_enumerate"><span class="returnvalue">udev_enumerate</span></a> * udev_enumerate_new (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td>
<td>udev library context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> an enumeration context
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_match_subsystem ()">
<a name="udev-enumerate-add-match-subsystem"></a><h3>udev_enumerate_add_match_subsystem ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_match_subsystem (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>subsystem</code></em> :</span></p></td>
<td>filter for a subsystem of the device to include in the list
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_nomatch_subsystem ()">
<a name="udev-enumerate-add-nomatch-subsystem"></a><h3>udev_enumerate_add_nomatch_subsystem ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_nomatch_subsystem
(<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>subsystem</code></em> :</span></p></td>
<td>filter for a subsystem of the device to exclude from the list
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_match_sysattr ()">
<a name="udev-enumerate-add-match-sysattr"></a><h3>udev_enumerate_add_match_sysattr ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_match_sysattr (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sysattr</code></em> :</span></p></td>
<td>filter for a sys attribute at the device to include in the list
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>optional value of the sys attribute
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_nomatch_sysattr ()">
<a name="udev-enumerate-add-nomatch-sysattr"></a><h3>udev_enumerate_add_nomatch_sysattr ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_nomatch_sysattr (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sysattr</code></em> :</span></p></td>
<td>filter for a sys attribute at the device to exclude from the list
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>optional value of the sys attribute
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_match_property ()">
<a name="udev-enumerate-add-match-property"></a><h3>udev_enumerate_add_match_property ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_match_property (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *property</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>property</code></em> :</span></p></td>
<td>filter for a property of the device to include in the list
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>value of the property
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_match_tag ()">
<a name="udev-enumerate-add-match-tag"></a><h3>udev_enumerate_add_match_tag ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_match_tag (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *tag</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tag</code></em> :</span></p></td>
<td>filter for a tag of the device to include in the list
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_match_sysname ()">
<a name="udev-enumerate-add-match-sysname"></a><h3>udev_enumerate_add_match_sysname ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_match_sysname (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *sysname</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sysname</code></em> :</span></p></td>
<td>filter for the name of the device to include in the list
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_add_syspath ()">
<a name="udev-enumerate-add-syspath"></a><h3>udev_enumerate_add_syspath ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_add_syspath (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *syspath</code></em>);</pre>
<p>
Add a device to the list of devices, to retrieve it back sorted in dependency order.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>syspath</code></em> :</span></p></td>
<td>path of a device
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="udev_enumerate_scan_devices ()">
<a name="udev-enumerate-scan-devices"></a><h3>udev_enumerate_scan_devices ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_scan_devices (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>udev enumeration context
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
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<div class="refsect2" title="udev_enumerate_scan_subsystems ()">
<a name="udev-enumerate-scan-subsystems"></a><h3>udev_enumerate_scan_subsystems ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> udev_enumerate_scan_subsystems (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);</pre>
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<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>udev enumeration context
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> 0 on success, otherwise a negative error value.
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<div class="refsect2" title="udev_enumerate_get_list_entry ()">
<a name="udev-enumerate-get-list-entry"></a><h3>udev_enumerate_get_list_entry ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * udev_enumerate_get_list_entry (<em class="parameter"><code><span class="type">struct udev_enumerate</span> *udev_enumerate</code></em>);</pre>
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<td><p><span class="term"><em class="parameter"><code>udev_enumerate</code></em> :</span></p></td>
<td>context
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the first entry of the sorted list of device paths.
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