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13 KiB
HTML
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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>
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<a href="#libudev-udev.description" class="shortcut">Description</a></span>
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<div class="refentry">
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<a name="libudev-udev"></a><div class="titlepage"></div>
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<div class="refnamediv"><table width="100%"><tr>
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<td valign="top">
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<h2><span class="refentrytitle"><a name="libudev-udev.top_of_page"></a>udev</span></h2>
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<p>udev — libudev context</p>
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</td>
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<td class="gallery_image" valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsect1">
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<a name="libudev-udev.functions"></a><h2>Functions</h2>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="functions_return">
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<col class="functions_name">
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</colgroup>
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<tbody>
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<tr>
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<td class="function_type">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
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</td>
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<td class="function_name">
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<a class="link" href="libudev-udev.html#udev-ref" title="udev_ref ()">udev_ref</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
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</td>
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<td class="function_name">
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<a class="link" href="libudev-udev.html#udev-unref" title="udev_unref ()">udev_unref</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
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</td>
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<td class="function_name">
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<a class="link" href="libudev-udev.html#udev-new" title="udev_new ()">udev_new</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">void</span>
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</td>
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<td class="function_name">
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<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>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">int</span>
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</td>
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<td class="function_name">
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<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>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">void</span>
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</td>
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<td class="function_name">
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<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>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">void</span> *
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</td>
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<td class="function_name">
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<a class="link" href="libudev-udev.html#udev-get-userdata" title="udev_get_userdata ()">udev_get_userdata</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">void</span>
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</td>
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<td class="function_name">
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<a class="link" href="libudev-udev.html#udev-set-userdata" title="udev_set_userdata ()">udev_set_userdata</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect1">
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<a name="libudev-udev.other"></a><h2>Types and Values</h2>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="name">
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<col class="description">
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</colgroup>
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<tbody><tr>
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<td class="datatype_keyword">struct</td>
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<td class="function_name"><a class="link" href="libudev-udev.html#udev" title="struct udev">udev</a></td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect1">
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<a name="libudev-udev.description"></a><h2>Description</h2>
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<p>The context contains the default values read from the udev config file,
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and is passed to all library operations.</p>
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</div>
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<div class="refsect1">
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<a name="libudev-udev.functions_details"></a><h2>Functions</h2>
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<div class="refsect2">
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<a name="udev-ref"></a><h3>udev_ref ()</h3>
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<pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
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udev_ref (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
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<p>Take a reference of the udev library context.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.2.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody><tr>
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<td class="parameter_name"><p>udev</p></td>
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<td class="parameter_description"><p>udev library context</p></td>
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<td class="parameter_annotations"> </td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.2.2.6.2.6"></a><h4>Returns</h4>
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<p> the passed udev library context</p>
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<p></p>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-unref"></a><h3>udev_unref ()</h3>
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<pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
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udev_unref (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
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<p>Drop a reference of the udev library context. If the refcount
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reaches zero, the resources of the context will be released.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.3.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody><tr>
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<td class="parameter_name"><p>udev</p></td>
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<td class="parameter_description"><p>udev library context</p></td>
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<td class="parameter_annotations"> </td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.2.2.6.3.6"></a><h4>Returns</h4>
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<p> the passed udev library context if it has still an active reference, or <span class="type">NULL</span> otherwise.</p>
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<p></p>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-new"></a><h3>udev_new ()</h3>
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<pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *
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udev_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
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<p>Create udev library context. This reads the udev configuration
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file, and fills in the default values.</p>
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<p>The initial refcount is 1, and needs to be decremented to
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release the resources of the udev library context.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.4.6"></a><h4>Returns</h4>
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<p> a new udev library context</p>
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<p></p>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-set-log-fn"></a><h3>udev_set_log_fn ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span>
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udev_set_log_fn (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
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<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>
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<p>This function is deprecated.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.5.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>udev</p></td>
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<td class="parameter_description"><p>udev library context</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>log_fn</p></td>
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<td class="parameter_description"><p>function to be called for log messages</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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</tbody>
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</table></div>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-get-log-priority"></a><h3>udev_get_log_priority ()</h3>
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<pre class="programlisting"><span class="returnvalue">int</span>
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udev_get_log_priority (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
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<p>This function is deprecated.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.6.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody><tr>
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<td class="parameter_name"><p>udev</p></td>
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<td class="parameter_description"><p>udev library context</p></td>
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<td class="parameter_annotations"> </td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.2.2.6.6.6"></a><h4>Returns</h4>
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<p></p>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-set-log-priority"></a><h3>udev_set_log_priority ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span>
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udev_set_log_priority (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
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<em class="parameter"><code><span class="type">int</span> priority</code></em>);</pre>
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<p>This function is deprecated.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.7.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>udev</p></td>
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<td class="parameter_description"><p>udev library context</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>priority</p></td>
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<td class="parameter_description"><p>the new log priority</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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</tbody>
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</table></div>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-get-userdata"></a><h3>udev_get_userdata ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span> *
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udev_get_userdata (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
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<p>Retrieve stored data pointer from library context. This might be useful
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to access from callbacks.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.8.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody><tr>
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<td class="parameter_name"><p>udev</p></td>
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<td class="parameter_description"><p>udev library context</p></td>
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<td class="parameter_annotations"> </td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.2.2.6.8.6"></a><h4>Returns</h4>
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<p> stored userdata</p>
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<p></p>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-set-userdata"></a><h3>udev_set_userdata ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span>
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udev_set_userdata (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
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<em class="parameter"><code><span class="type">void</span> *userdata</code></em>);</pre>
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<p>Store custom <em class="parameter"><code>userdata</code></em>
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in the library context.</p>
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<div class="refsect3">
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<a name="id-1.2.2.6.9.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>udev</p></td>
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<td class="parameter_description"><p>udev library context</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>userdata</p></td>
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<td class="parameter_description"><p>data pointer</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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</tbody>
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</table></div>
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</div>
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</div>
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</div>
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<div class="refsect1">
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<a name="libudev-udev.other_details"></a><h2>Types and Values</h2>
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<div class="refsect2">
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<a name="udev"></a><h3>struct udev</h3>
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<pre class="programlisting">struct udev;</pre>
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<p>Opaque object representing the library context.</p>
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</div>
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</div>
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</div>
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<div class="footer">
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<hr>
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