Hello again, Ryan! Besides control_hw.c here are the relevant hits I could find: https://github.com/alsa-project/alsa-lib/search?q=snd_ctl_ops_t Hope it helps, Geraldo Nasscimento On Wed, Sep 15, 2021 at 1:11 PM Geraldo Nascimento <geraldogabriel@xxxxxxxxx> wrote: > > Hi, Ryan! > > Em Qua, 15 de set de 2021 05:45, Ryan McClue <re.mcclue@xxxxxxxxxxxxxx> escreveu: >> >> The struct _snd_ctl_ops contains a number of function pointers. >> Where are these functions defined in the alsa-lib source tree, e.g int (*subscribe_events)(snd_ctl_t *handle, int subscribe) > > > Perhaps you are looking for src/control/control_hw.c specifically at line 341? > > Thanks, > Geraldo Nascimento > >> >> -- >> Ryan McClue, Sydney