Re: [question] v4l read() operation

Hi Dave, 2012/2/25 Dave Hylands <dhylands@gmail.com>:

I'm not all that familiar with v4l, but based on what you've posted, you need to populate the read routine in your v4l2_fops structure to support read.

My bad! You are totally right: I forgot about my webcam. When I did: $ cat /dev/video0 I was actually getting data from my webcam (which supports read), and not from the easycap device, which is /dev/video1. So, everything makes sense now: $ cat /dev/video1 ... open("/dev/video1", O_RDONLY|O_LARGEFILE) = 3 ... read(3, 0x8835000, 32768) = -1 EINVAL (Invalid argument) This is clearly shown by the piece of code mentioned before. Thanks and sorry for the noise, Ezequiel.