Non-blocking device file may be causing invalid captured buffer

[vladimirvivien]

Currently, the a device is opened as non-blocking and the code uses select to be notified of buffer readiness. This appears to cause incomplete or incorrect buffers to be returned. This could be due to the driver still writing while buffer is being read. The current workaround has been to copy the buffer before making it available for use.

Explore other approaches including blocking read, DMA, or direct device reads or make them all available at some point and let developer select which work best for device being tested.