snd_pcm_notify(9)

📦 version 7.3.1, in nixpkgs unstable

💖 snd_pcm_notify — the Kernel API Manual girlies' edition 💖

okay so bestie, welcome to the Kernel API Manual page for snd_pcm_notify, and no cap this one is short and sweet but you're gonna Get It. it's giving "small function, big responsibility" energy. let's go 🫶

✨ NAME ✨

snd_pcm_notify — add/remove the notify list 💅

like literally the whole job is putting a notifier on a list or taking it back off. iconic behaviour, zero notes.

✨ SYNOPSIS ✨

int snd_pcm_notify (struct snd_pcm_notify *notify , int nfree );

that's the whole signature, copy it exactly, don't be cute with it 🙈

✨ ARGUMENTS ✨

  • notify — the PCM notify list, aka the little struct you're handing over. this is your main character 🌟
  • nfree — the switch, and it only has two moods:
    • 0 = register
    • 1 = unregister

periodt. that's the whole argument situation.

✨ DESCRIPTION ✨

so what it does: this adds the given notifier to the global list, so that the callback gets called for each registered PCM devices. lowkey powerful if you think about it 😭

and the tea ☕ — this exists only for PCM OSS emulation, so far. that's it. that's the entire use case right now. don't come for me, that's what the page says, i'm just the messenger 🎀

✨ RETURN ✨

  • zero if successful 😌✨
  • or a negative error code 💀 (you know the drill, negative = it did not slay)

✨ SEE ALSO ✨

go read those next bestie, they're all linked in the same little friend group 🦋

ngl this page is short but every single line of it matters, so don't skip the nfree values. 0 and 1 are not interchangeable and i will not be held responsible for your driver if you get them backwards 💀

and that's the whole vibe 🎀 this one lives in ./sound/core, it's dated October 2026, and it's filed under snd_pcm_notify(9) — mwah, go touch some PCM streams, ily, bye 💜🧚‍♀️

📦 where this page comes from