ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT &manvol; VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT Subscribe or unsubscribe event int ioctl int fd int request struct v4l2_event_subscription *argp fd &fd; request VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT argp Subscribe or unsubscribe V4L2 event. Subscribed events are dequeued by using the &VIDIOC-DQEVENT; ioctl. &cs-str; __u32 type Type of the event. __u32 reserved[7] Reserved for future extensions. Drivers and applications must set the array to zero. &cs-def; V4L2_EVENT_ALL 0 All events. V4L2_EVENT_ALL is valid only for VIDIOC_UNSUBSCRIBE_EVENT for unsubscribing all events at once. V4L2_EVENT_VSYNC 1 This event is triggered on the vertical sync. This event has &v4l2-event-vsync; associated with it. V4L2_EVENT_EOS 2 This event is triggered when the end of a stream is reached. This is typically used with MPEG decoders to report to the application when the last of the MPEG stream has been decoded. V4L2_EVENT_PRIVATE_START 0x08000000 Base event number for driver-private events. &cs-str; __u8 field The upcoming field. See &v4l2-field;.