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-<refentry id="vidioc-subscribe-event">
-  <refmeta>
-    <refentrytitle>ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refentrytitle>
-    &manvol;
-  </refmeta>
-
-  <refnamediv>
-      <refname>VIDIOC_SUBSCRIBE_EVENT</refname>
-      <refname>VIDIOC_UNSUBSCRIBE_EVENT</refname>
-    <refpurpose>Subscribe or unsubscribe event</refpurpose>
-  </refnamediv>
-
-  <refsynopsisdiv>
-    <funcsynopsis>
-      <funcprototype>
-	<funcdef>int <function>ioctl</function></funcdef>
-	<paramdef>int <parameter>fd</parameter></paramdef>
-	<paramdef>int <parameter>request</parameter></paramdef>
-	<paramdef>struct v4l2_event_subscription
-*<parameter>argp</parameter></paramdef>
-      </funcprototype>
-    </funcsynopsis>
-  </refsynopsisdiv>
-
-  <refsect1>
-    <title>Arguments</title>
-
-    <variablelist>
-      <varlistentry>
-	<term><parameter>fd</parameter></term>
-	<listitem>
-	  <para>&fd;</para>
-	</listitem>
-      </varlistentry>
-      <varlistentry>
-	<term><parameter>request</parameter></term>
-	<listitem>
-	  <para>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</para>
-	</listitem>
-      </varlistentry>
-      <varlistentry>
-	<term><parameter>argp</parameter></term>
-	<listitem>
-	  <para></para>
-	</listitem>
-      </varlistentry>
-    </variablelist>
-  </refsect1>
-
-  <refsect1>
-    <title>Description</title>
-
-    <para>Subscribe or unsubscribe V4L2 event. Subscribed events are
-    dequeued by using the &VIDIOC-DQEVENT; ioctl.</para>
-
-    <table frame="none" pgwide="1" id="v4l2-event-subscription">
-      <title>struct <structname>v4l2_event_subscription</structname></title>
-      <tgroup cols="3">
-	&cs-str;
-	<tbody valign="top">
-	  <row>
-	    <entry>__u32</entry>
-	    <entry><structfield>type</structfield></entry>
-	    <entry>Type of the event, see <xref linkend="event-type" />. Note that
-<constant>V4L2_EVENT_ALL</constant> can be used with VIDIOC_UNSUBSCRIBE_EVENT
-for unsubscribing all events at once.</entry>
-	  </row>
-	  <row>
-	    <entry>__u32</entry>
-	    <entry><structfield>id</structfield></entry>
-	    <entry>ID of the event source. If there is no ID associated with
-		the event source, then set this to 0. Whether or not an event
-		needs an ID depends on the event type.</entry>
-	  </row>
-	  <row>
-	    <entry>__u32</entry>
-	    <entry><structfield>flags</structfield></entry>
-	    <entry>Event flags, see <xref linkend="event-flags" />.</entry>
-	  </row>
-	  <row>
-	    <entry>__u32</entry>
-	    <entry><structfield>reserved</structfield>[5]</entry>
-	    <entry>Reserved for future extensions. Drivers and applications
-	    must set the array to zero.</entry>
-	  </row>
-	</tbody>
-      </tgroup>
-    </table>
-
-    <table pgwide="1" frame="none" id="event-flags">
-      <title>Event Flags</title>
-      <tgroup cols="3">
-	&cs-def;
-	<tbody valign="top">
-	  <row>
-	    <entry><constant>V4L2_EVENT_SUB_FL_SEND_INITIAL</constant></entry>
-	    <entry>0x0001</entry>
-	    <entry>When this event is subscribed an initial event will be sent
-		containing the current status. This only makes sense for events
-		that are triggered by a status change such as <constant>V4L2_EVENT_CTRL</constant>.
-		Other events will ignore this flag.</entry>
-	  </row>
-	  <row>
-	    <entry><constant>V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK</constant></entry>
-	    <entry>0x0002</entry>
-	    <entry><para>If set, then events directly caused by an ioctl will also be sent to
-		the filehandle that called that ioctl. For example, changing a control using
-		&VIDIOC-S-CTRL; will cause a V4L2_EVENT_CTRL to be sent back to that same
-		filehandle. Normally such events are suppressed to prevent feedback loops
-		where an application changes a control to a one value and then another, and
-		then receives an event telling it that that control has changed to the first
-		value.</para>
-
-		<para>Since it can't tell whether that event was caused by another application
-		or by the &VIDIOC-S-CTRL; call it is hard to decide whether to set the
-		control to the value in the event, or ignore it.</para>
-
-		<para>Think carefully when you set this flag so you won't get into situations
-		like that.</para>
-	    </entry>
-	  </row>
-	</tbody>
-      </tgroup>
-    </table>
-
-  </refsect1>
-  <refsect1>
-    &return-value;
-  </refsect1>
-</refentry>