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

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

Please clarify

Thanks a lot in advance.

Mehdi