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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>libudev Reference Manual: udev</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 
                  <a href="#libudev-udev.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#libudev-udev.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<div class="refentry">
<a name="libudev-udev"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libudev-udev.top_of_page"></a>udev</span></h2>
<p>udev — libudev context</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libudev-udev.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-ref" title="udev_ref ()">udev_ref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-unref" title="udev_unref ()">udev_unref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-new" title="udev_new ()">udev_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-set-log-fn" title="udev_set_log_fn ()">udev_set_log_fn</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-get-log-priority" title="udev_get_log_priority ()">udev_get_log_priority</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-set-log-priority" title="udev_set_log_priority ()">udev_set_log_priority</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-get-userdata" title="udev_get_userdata ()">udev_get_userdata</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libudev-udev.html#udev-set-userdata" title="udev_set_userdata ()">udev_set_userdata</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libudev-udev.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="libudev-udev.html#udev" title="struct udev">udev</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libudev-udev.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="libudev-udev.description"></a><h2>Description</h2>
<p>The context contains the default values read from the udev config file,
and is passed to all library operations.</p>
</div>
<div class="refsect1">
<a name="libudev-udev.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="udev-ref"></a><h3>udev_ref ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
udev_ref (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
<p>Take a reference of the udev library context.</p>
<div class="refsect3">
<a name="id-1.2.2.7.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>udev</p></td>
<td class="parameter_description"><p>udev library context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.2.7.2.6"></a><h4>Returns</h4>
<p> the passed udev library context</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-unref"></a><h3>udev_unref ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
udev_unref (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
<p>Drop a reference of the udev library context. If the refcount
reaches zero, the resources of the context will be released.</p>
<div class="refsect3">
<a name="id-1.2.2.7.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>udev</p></td>
<td class="parameter_description"><p>udev library context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.2.7.3.6"></a><h4>Returns</h4>
<p> the passed udev library context if it has still an active reference, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> otherwise.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-new"></a><h3>udev_new ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
udev_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Create udev library context. This reads the udev configuration
file, and fills in the default values.</p>
<p>The initial refcount is 1, and needs to be decremented to
release the resources of the udev library context.</p>
<div class="refsect3">
<a name="id-1.2.2.7.4.6"></a><h4>Returns</h4>
<p> a new udev library context</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-set-log-fn"></a><h3>udev_set_log_fn ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
udev_set_log_fn (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
                 <em class="parameter"><code><span class="type">void</span> (*log_fn) (struct udev *udev, int priority, const char *file, int line, const char *fn, const char *format, va_list args)</code></em>);</pre>
<p>The built-in logging writes to stderr. It can be
overridden by a custom function, to plug log messages
into the users' logging functionality.</p>
<div class="refsect3">
<a name="id-1.2.2.7.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>udev</p></td>
<td class="parameter_description"><p>udev library context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>log_fn</p></td>
<td class="parameter_description"><p>function to be called for logging messages</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-get-log-priority"></a><h3>udev_get_log_priority ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
udev_get_log_priority (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
<p>The initial logging priority is read from the udev config file
at startup.</p>
<div class="refsect3">
<a name="id-1.2.2.7.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>udev</p></td>
<td class="parameter_description"><p>udev library context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.2.7.6.6"></a><h4>Returns</h4>
<p> the current logging priority</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-set-log-priority"></a><h3>udev_set_log_priority ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
udev_set_log_priority (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
                       <em class="parameter"><code><span class="type">int</span> priority</code></em>);</pre>
<p>Set the current logging priority. The value controls which messages
are logged.</p>
<div class="refsect3">
<a name="id-1.2.2.7.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>udev</p></td>
<td class="parameter_description"><p>udev library context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>priority</p></td>
<td class="parameter_description"><p>the new logging priority</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-get-userdata"></a><h3>udev_get_userdata ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
udev_get_userdata (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
<p>Retrieve stored data pointer from library context. This might be useful
to access from callbacks like a custom logging function.</p>
<div class="refsect3">
<a name="id-1.2.2.7.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>udev</p></td>
<td class="parameter_description"><p>udev library context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.2.7.8.6"></a><h4>Returns</h4>
<p> stored userdata</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-set-userdata"></a><h3>udev_set_userdata ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
udev_set_userdata (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
                   <em class="parameter"><code><span class="type">void</span> *userdata</code></em>);</pre>
<p>Store custom <em class="parameter"><code>userdata</code></em>
 in the library context.</p>
<div class="refsect3">
<a name="id-1.2.2.7.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>udev</p></td>
<td class="parameter_description"><p>udev library context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>userdata</p></td>
<td class="parameter_description"><p>data pointer</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="libudev-udev.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="udev"></a><h3>struct udev</h3>
<pre class="programlisting">struct udev;</pre>
<p>Opaque object representing the library context.</p>
</div>
</div>
</div>
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