On 19:32 Thu 07 Feb 2008, Mayank Kaushik wrote:
> I am puzzled about what IOCTLs are and what they are used for. I could not
> understand much from the the man page for ioctl.
I was very puzzled about ioctls when I first started using Unix too. :)
In any case, an ioctl is short for "I/O Control" and is used to perform
functions on device entries (/dev/video0 for example).
> A description of what ioctls are used for (alongwith an example usage) would
> be very helpful.
An example from the video4linux subsystem would be this call to turn off
a video stream:
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret = ioctl(fd, VIDIOC_STREAMOFF, &type)
Where fd is an open /dev/video* entry.
Hope that helps.
Cheers,
Brandon
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