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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#libudev-udev-queue.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#libudev-udev-queue.description" class="shortcut">Description</a>
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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 valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="libudev-udev-queue.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct              <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue">udev_queue</a>;
struct <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> * <a class="link" href="libudev-udev-queue.html#udev-queue-ref" title="udev_queue_ref ()">udev_queue_ref</a>                      (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libudev-udev-queue.html#udev-queue-unref" title="udev_queue_unref ()">udev_queue_unref</a>                    (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</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-queue.html#udev-queue-get-udev" title="udev_queue_get_udev ()">udev_queue_get_udev</a>                 (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);
struct <a class="link" href="libudev-udev-queue.html#udev-queue" title="struct udev_queue"><span class="returnvalue">udev_queue</span></a> * <a class="link" href="libudev-udev-queue.html#udev-queue-new" title="udev_queue_new ()">udev_queue_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-queue.html#udev-queue-get-udev-is-active" title="udev_queue_get_udev_is_active ()">udev_queue_get_udev_is_active</a>       (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);
<span class="returnvalue">int</span>                 <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>       (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);
<span class="returnvalue">int</span>                 <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>   (<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>);
<span class="returnvalue">int</span>                 <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>
                                                        (<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>);
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-queue.html#udev-queue-get-queued-list-entry" title="udev_queue_get_queued_list_entry ()">udev_queue_get_queued_list_entry</a>
                                                        (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);
unsigned long long <span class="returnvalue">int</span> <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>     (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);
unsigned long long <span class="returnvalue">int</span> <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>       (<em class="parameter"><code><span class="type">struct udev_queue</span> *udev_queue</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libudev-udev-queue.description"></a><h2>Description</h2>
<p>
The udev daemon processes events asynchronously. All events which do not have
interdependencies run in parallel. This exports the current state of the
event processing queue, and the current event sequence numbers from the kernel
and the udev daemon.
</p>
</div>
<div class="refsect1">
<a name="libudev-udev-queue.details"></a><h2>Details</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>
<hr>
<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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the same udev queue context.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="udev-queue-unref"></a><h3>udev_queue_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr></tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue 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">
<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="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>the udev queue context, or <span class="type">NULL</span> on error.</td>
</tr>
</tbody>
</table></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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a flag indicating if udev is active.</td>
</tr>
</tbody>
</table></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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a flag indicating if udev is currently handling events.</td>
</tr>
</tbody>
</table></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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>seqnum</code></em> :</span></p></td>
<td>sequence number</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a flag indicating if the given sequence number is currently active.</td>
</tr>
</tbody>
</table></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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start</code></em> :</span></p></td>
<td>first event sequence number</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>end</code></em> :</span></p></td>
<td>last event sequence number</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a flag indicating if any of the sequence numbers in the given range is currently active.</td>
</tr>
</tbody>
</table></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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the first entry of the list of queued events.</td>
</tr>
</tbody>
</table></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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current kernel event sequence number.</td>
</tr>
</tbody>
</table></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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>udev_queue</code></em> :</span></p></td>
<td>udev queue context</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the last known udev event sequence number.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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