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<a href="#libudev-udev-hwdb.synopsis" class="shortcut">Top</a>
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<a href="#libudev-udev-hwdb.description" class="shortcut">Description</a>
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<div class="refentry">
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<a name="libudev-udev-hwdb"></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-hwdb.top_of_page"></a>udev_hwdb</span></h2>
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<p>udev_hwdb — retrieve properties from the hardware database</p>
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</td>
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<td valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsynopsisdiv">
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<a name="libudev-udev-hwdb.synopsis"></a><h2>Synopsis</h2>
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<pre class="synopsis">struct <a class="link" href="libudev-udev-hwdb.html#udev-hwdb" title="struct udev_hwdb">udev_hwdb</a>;
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struct <a class="link" href="libudev-udev-hwdb.html#udev-hwdb" title="struct udev_hwdb"><span class="returnvalue">udev_hwdb</span></a> * <a class="link" href="libudev-udev-hwdb.html#udev-hwdb-ref" title="udev_hwdb_ref ()">udev_hwdb_ref</a> (<em class="parameter"><code><span class="type">struct udev_hwdb</span> *hwdb</code></em>);
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struct <a class="link" href="libudev-udev-hwdb.html#udev-hwdb" title="struct udev_hwdb"><span class="returnvalue">udev_hwdb</span></a> * <a class="link" href="libudev-udev-hwdb.html#udev-hwdb-unref" title="udev_hwdb_unref ()">udev_hwdb_unref</a> (<em class="parameter"><code><span class="type">struct udev_hwdb</span> *hwdb</code></em>);
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struct <a class="link" href="libudev-udev-hwdb.html#udev-hwdb" title="struct udev_hwdb"><span class="returnvalue">udev_hwdb</span></a> * <a class="link" href="libudev-udev-hwdb.html#udev-hwdb-new" title="udev_hwdb_new ()">udev_hwdb_new</a> (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);
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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-hwdb.html#udev-hwdb-get-properties-list-entry" title="udev_hwdb_get_properties_list_entry ()">udev_hwdb_get_properties_list_entry</a>
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(<em class="parameter"><code><span class="type">struct udev_hwdb</span> *hwdb</code></em>,
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<em class="parameter"><code>const <span class="type">char</span> *modalias</code></em>,
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<em class="parameter"><code>unsigned <span class="type">int</span> flags</code></em>);
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</pre>
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</div>
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<div class="refsect1">
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<a name="libudev-udev-hwdb.description"></a><h2>Description</h2>
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<p>
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Libudev hardware database interface.
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</p>
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</div>
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<div class="refsect1">
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<a name="libudev-udev-hwdb.details"></a><h2>Details</h2>
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<div class="refsect2">
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<a name="udev-hwdb"></a><h3>struct udev_hwdb</h3>
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<pre class="programlisting">struct udev_hwdb;</pre>
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<p>
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Opaque object representing the hardware database.
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</p>
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</div>
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<hr>
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<div class="refsect2">
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<a name="udev-hwdb-ref"></a><h3>udev_hwdb_ref ()</h3>
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<pre class="programlisting">struct <a class="link" href="libudev-udev-hwdb.html#udev-hwdb" title="struct udev_hwdb"><span class="returnvalue">udev_hwdb</span></a> * udev_hwdb_ref (<em class="parameter"><code><span class="type">struct udev_hwdb</span> *hwdb</code></em>);</pre>
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<p>
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Take a reference of a hwdb context.
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</p>
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<div class="variablelist"><table border="0" class="variablelist">
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<colgroup>
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<col align="left" valign="top">
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<col>
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>hwdb</code></em> :</span></p></td>
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<td>context</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>the passed enumeration context</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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<hr>
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<div class="refsect2">
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<a name="udev-hwdb-unref"></a><h3>udev_hwdb_unref ()</h3>
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<pre class="programlisting">struct <a class="link" href="libudev-udev-hwdb.html#udev-hwdb" title="struct udev_hwdb"><span class="returnvalue">udev_hwdb</span></a> * udev_hwdb_unref (<em class="parameter"><code><span class="type">struct udev_hwdb</span> *hwdb</code></em>);</pre>
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<p>
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Drop a reference of a hwdb context. If the refcount reaches zero,
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all resources of the hwdb context will be released.
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</p>
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<div class="variablelist"><table border="0" class="variablelist">
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<colgroup>
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<col align="left" valign="top">
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<col>
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>hwdb</code></em> :</span></p></td>
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<td>context</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>the passed hwdb context if it has still an active reference, or <span class="type">NULL</span> otherwise.</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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<hr>
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<div class="refsect2">
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<a name="udev-hwdb-new"></a><h3>udev_hwdb_new ()</h3>
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<pre class="programlisting">struct <a class="link" href="libudev-udev-hwdb.html#udev-hwdb" title="struct udev_hwdb"><span class="returnvalue">udev_hwdb</span></a> * udev_hwdb_new (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
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<p>
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Create a hardware database context to query properties for devices.
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</p>
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<div class="variablelist"><table border="0" class="variablelist">
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<colgroup>
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<col align="left" valign="top">
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<col>
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</colgroup>
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td>
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<td>udev library context</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>a hwdb context.</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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<hr>
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<div class="refsect2">
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<a name="udev-hwdb-get-properties-list-entry"></a><h3>udev_hwdb_get_properties_list_entry ()</h3>
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<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_hwdb_get_properties_list_entry
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(<em class="parameter"><code><span class="type">struct udev_hwdb</span> *hwdb</code></em>,
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<em class="parameter"><code>const <span class="type">char</span> *modalias</code></em>,
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<em class="parameter"><code>unsigned <span class="type">int</span> flags</code></em>);</pre>
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<p>
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Lookup a matching device in the hardware database. The lookup key is a
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modalias string, whose formats are defined for the Linux kernel modules.
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Examples are: pci:v00008086d00001C2D*, usb:v04F2pB221*. The first entry
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of a list of retrieved properties is returned.
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</p>
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<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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</colgroup>
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>hwdb</code></em> :</span></p></td>
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<td>context</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>modalias</code></em> :</span></p></td>
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<td>modalias string</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
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<td>(unused)</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>a udev_list_entry.</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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