snd_ctl_add_vmaster_hook(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 snd_ctl_add_vmaster_hook — bestie edition 🎀

okay so this is a page from the Kernel API Manual, and the star of the show is snd_ctl_add_vmaster_hook. say hi 👋

✨ NAME ✨

snd_ctl_add_vmaster_hook — literally just "Add a hook to a vmaster control". that's the whole vibe. it hooks your vmaster. iconic behavior. 💅

🌸 SYNOPSIS 🌸

int snd_ctl_add_vmaster_hook (struct snd_kcontrol *kcontrol , void
(*hook)(void *private_data, int) , void *private_data );

yes bestie, three args, no notes. copy it exactly, don't @ me. 🫶

🦋 ARGUMENTS 🦋

  • kcontrol — the vmaster kctl element. like, the main character of this whole operation 👑
  • hook — the hook function itself. the little callback that's gonna get called. it's giving "waiting in the wings" energy ✨
  • private_data — the private_data pointer to be saved. yes it's also called private_data. yes that's a lot of private_data. we move. 🙈

💖 DESCRIPTION 💖

so what it does: it adds the given hook to the vmaster control element so that the hook gets called at each time when the value is changed. that's it. that's the whole thing. every single time the value changes — hook time. ⭐

no cap, that's genuinely all this one does, and honestly? we love a function with a clear purpose. 🌈

🔥 RETURN 🔥

Zero. that's it. zero. it returns zero. lowkey the most chill return value in the kernel. not me being obsessed with a 0 😭

👑 SEE ALSO 👑

the kernel file lives at ./sound/core/vmaster.c, and here's the rest of the friend group:

go read those too, bestie, they're all in the same squad 💜

ngl this page is short and sweet and that's the point — one hook, one job, one zero. 🍓

and that's the page!! 💫 sign-off time: this one came from ./sound/core, dated October 2026, out of the Kernel API Manual — mwah, go touch some sound code, ily 🧚‍♀️💖

📦 where this page comes from