[alsa-devel] alsa return codes

Hi, I am trying to figure out what the error/return codes are for ALSA (advanced linux sound architecture). I have had no luck searching the web. I am seeing the below messages:

arecord0 has exited with return code -12. arecord1 has exited with return code -12. aplay has exited with return code -12.

Thanks, Hector