[alsa-devel] 0 or EAGAIN from snd_pcm_update_avail()?

[Ludovico Cavedon]

Hi all,

if snd_pcm_update_avail() gets called on a PCM device in non-blocking
mode when no data is availabe jet, what is the expected return value?
-0
-EAGAIN
-either is valid

I am asking this question because pulseaudio expect to receive 0, but
the the bluetooth headset pcm transfer callback returns EAGAIN, so I
want to find out against whoms I should open a bug :)

Thanks in advance,
Ludovico