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- <title>Event Interface</title>
-
- <para>The V4L2 event interface provides means for user to get
- immediately notified on certain conditions taking place on a device.
- This might include start of frame or loss of signal events, for
- example.
- </para>
-
- <para>To receive events, the events the user is interested in first must
- be subscribed using the &VIDIOC-SUBSCRIBE-EVENT; ioctl. Once an event is
- subscribed, the events of subscribed types are dequeueable using the
- &VIDIOC-DQEVENT; ioctl. Events may be unsubscribed using
- VIDIOC_UNSUBSCRIBE_EVENT ioctl. The special event type V4L2_EVENT_ALL may
- be used to unsubscribe all the events the driver supports.</para>
-
- <para>The event subscriptions and event queues are specific to file
- handles. Subscribing an event on one file handle does not affect
- other file handles.
- </para>
-
- <para>The information on dequeueable events is obtained by using select or
- poll system calls on video devices. The V4L2 events use POLLPRI events on
- poll system call and exceptions on select system call. </para>
-
- <!--
-Local Variables:
-mode: sgml
-sgml-parent-document: "v4l2.sgml"
-indent-tabs-mode: nil
-End:
- -->