Re: [alsa-devel] How does ALSALIB commuciates with low level kernel API

On Wed, Jun 15, 2016 at 12:12:24AM +0100, Chemsi Mehdi wrote:

Dear experts,

I am too new in ALSA, trying to read a little bit and understand. I want to underatnd how ALSA userspace API calls kernel space code ? for example when I call snd_pcm_open() which code is called in kernel sound code ?

easist would be to start gdb on alsa-lib snd_pcm_open() and start tracing the steps.

and how the link is made ? via IOCTL/write ?

IOCTL, see sound/core/pcm_native.c on kernel side..