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<title>libudev Reference Manual: udev_queue</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
<a href="#libudev-udev-queue.description" class="shortcut">Description</a></span>
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<div class="refentry">
<a name="libudev-udev-queue"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libudev-udev-queue.top_of_page"></a>udev_queue</span></h2>
<p>udev_queue — access to currently active events</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libudev-udev-queue.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-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev-queue.html#udev-queue-ref" title="udev_queue_ref ()">udev_queue_ref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">struct <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev-queue.html#udev-queue-unref" title="udev_queue_unref ()">udev_queue_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-queue.html#udev-queue-get-udev" title="udev_queue_get_udev ()">udev_queue_get_udev</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">struct <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev-queue.html#udev-queue-new" title="udev_queue_new ()">udev_queue_new</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-queue.html#udev-queue-get-udev-is-active" title="udev_queue_get_udev_is_active ()">udev_queue_get_udev_is_active</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-queue.html#udev-queue-get-queue-is-empty" title="udev_queue_get_queue_is_empty ()">udev_queue_get_queue_is_empty</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-queue.html#udev-queue-get-seqnum-is-finished" title="udev_queue_get_seqnum_is_finished ()">udev_queue_get_seqnum_is_finished</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-queue.html#udev-queue-get-seqnum-sequence-is-finished" title="udev_queue_get_seqnum_sequence_is_finished ()">udev_queue_get_seqnum_sequence_is_finished</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">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> *
</td>
<td class="function_name">
<a class="link" href="libudev-udev-queue.html#udev-queue-get-queued-list-entry" title="udev_queue_get_queued_list_entry ()">udev_queue_get_queued_list_entry</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned long long <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libudev-udev-queue.html#udev-queue-get-kernel-seqnum" title="udev_queue_get_kernel_seqnum ()">udev_queue_get_kernel_seqnum</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned long long <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libudev-udev-queue.html#udev-queue-get-udev-seqnum" title="udev_queue_get_udev_seqnum ()">udev_queue_get_udev_seqnum</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-queue.html#udev-queue-get-fd" title="udev_queue_get_fd ()">udev_queue_get_fd</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-queue.html#udev-queue-flush" title="udev_queue_flush ()">udev_queue_flush</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libudev-udev-queue.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-queue.html#udev-queue" title="struct udev_queue">udev_queue</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libudev-udev-queue.description"></a><h2>Description</h2>
<p>This exports the current state of the udev processing queue.</p>
</div>
<div class="refsect1">
<a name="libudev-udev-queue.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="udev-queue-ref"></a><h3>udev_queue_ref ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> *
udev_queue_ref (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>Take a reference of a udev queue context.</p>
<div class="refsect3">
<a name="id-1.2.7.6.2.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.2.6"></a><h4>Returns</h4>
<p> the same udev queue context.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-unref"></a><h3>udev_queue_unref ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> *
udev_queue_unref (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>Drop a reference of a udev queue context. If the refcount reaches zero,
the resources of the queue context will be released.</p>
<div class="refsect3">
<a name="id-1.2.7.6.3.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.3.6"></a><h4>Returns</h4>
<p> <span class="type">NULL</span></p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-udev"></a><h3>udev_queue_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_queue_get_udev (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>Retrieve the udev library context the queue context was created with.</p>
<div class="refsect3">
<a name="id-1.2.7.6.4.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.4.6"></a><h4>Returns</h4>
<p> the udev library context.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-new"></a><h3>udev_queue_new ()</h3>
<pre class="programlisting">struct <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> *
udev_queue_new (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
<p>The initial refcount is 1, and needs to be decremented to
release the resources of the udev queue context.</p>
<div class="refsect3">
<a name="id-1.2.7.6.5.5"></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></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.5.6"></a><h4>Returns</h4>
<p> the udev queue context, or <span class="type">NULL</span> on error.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-udev-is-active"></a><h3>udev_queue_get_udev_is_active ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
udev_queue_get_udev_is_active (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>Check if udev is active on the system.</p>
<div class="refsect3">
<a name="id-1.2.7.6.6.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.6.6"></a><h4>Returns</h4>
<p> a flag indicating if udev is active.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-queue-is-empty"></a><h3>udev_queue_get_queue_is_empty ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
udev_queue_get_queue_is_empty (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>Check if udev is currently processing any events.</p>
<div class="refsect3">
<a name="id-1.2.7.6.7.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.7.6"></a><h4>Returns</h4>
<p> a flag indicating if udev is currently handling events.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-seqnum-is-finished"></a><h3>udev_queue_get_seqnum_is_finished ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
udev_queue_get_seqnum_is_finished (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>,
<em class="parameter"><code>unsigned long long <span class="type">int</span> seqnum</code></em>);</pre>
<p>This function is deprecated, it just returns the result of
<a class="link" href="libudev-udev-queue.html#udev-queue-get-queue-is-empty" title="udev_queue_get_queue_is_empty ()"><code class="function">udev_queue_get_queue_is_empty()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.7.6.8.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>seqnum</p></td>
<td class="parameter_description"><p>sequence number</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.8.6"></a><h4>Returns</h4>
<p> a flag indicating if udev is currently handling events.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-seqnum-sequence-is-finished"></a><h3>udev_queue_get_seqnum_sequence_is_finished ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
udev_queue_get_seqnum_sequence_is_finished
(<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>,
<em class="parameter"><code>unsigned long long <span class="type">int</span> start</code></em>,
<em class="parameter"><code>unsigned long long <span class="type">int</span> end</code></em>);</pre>
<p>This function is deprecated, it just returns the result of
<a class="link" href="libudev-udev-queue.html#udev-queue-get-queue-is-empty" title="udev_queue_get_queue_is_empty ()"><code class="function">udev_queue_get_queue_is_empty()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.7.6.9.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start</p></td>
<td class="parameter_description"><p>first event sequence number</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>end</p></td>
<td class="parameter_description"><p>last event sequence number</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.9.6"></a><h4>Returns</h4>
<p> a flag indicating if udev is currently handling events.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-queued-list-entry"></a><h3>udev_queue_get_queued_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_queue_get_queued_list_entry (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>This function is deprecated.</p>
<div class="refsect3">
<a name="id-1.2.7.6.10.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.10.6"></a><h4>Returns</h4>
<p> NULL.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-kernel-seqnum"></a><h3>udev_queue_get_kernel_seqnum ()</h3>
<pre class="programlisting">unsigned long long <span class="returnvalue">int</span>
udev_queue_get_kernel_seqnum (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>This function is deprecated.</p>
<div class="refsect3">
<a name="id-1.2.7.6.11.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.11.6"></a><h4>Returns</h4>
<p> 0.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-get-udev-seqnum"></a><h3>udev_queue_get_udev_seqnum ()</h3>
<pre class="programlisting">unsigned long long <span class="returnvalue">int</span>
udev_queue_get_udev_seqnum (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
<p>This function is deprecated.</p>
<div class="refsect3">
<a name="id-1.2.7.6.12.5"></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_queue</p></td>
<td class="parameter_description"><p>udev queue context</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
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<div class="refsect3">
<a name="id-1.2.7.6.12.6"></a><h4>Returns</h4>
<p> 0.</p>
<p></p>
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<hr>
<div class="refsect2">
<a name="udev-queue-get-fd"></a><h3>udev_queue_get_fd ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
udev_queue_get_fd (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-flush"></a><h3>udev_queue_flush ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
udev_queue_flush (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);</pre>
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</div>
<div class="refsect1">
<a name="libudev-udev-queue.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="udev-queue"></a><h3>struct udev_queue</h3>
<pre class="programlisting">struct udev_queue;</pre>
<p>Opaque object representing the current event queue in the udev daemon.</p>
</div>
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