virtsnd_kctl_tlv_op(9)

📦 version 7.3.1, in nixpkgs unstable

👑 virtsnd_kctl_tlv_op(9) — like, the Kernel API Manual, but make it make sense

okay so bestie, welcome to the glow-up of virtsnd_kctl_tlv_op 💅 this little icon lives in the Kernel API Manual (section 9, very demure, very kernel), and it's literally just here to do One Job on a control's metadata. no cap.

✨ NAME ✨

virtsnd_kctl_tlv_op — perform an operation on the control's metadata 🎀

like, that's it. that's the whole personality. it takes a control, it does a thing to the metadata, and it goes home.

🦋 SYNOPSIS 🦋

int virtsnd_kctl_tlv_op (struct snd_kcontrol *kcontrol , int op_flag ,
unsigned int size , unsigned int __user *utlv );

yes the spacing is giving exactly what the original is giving, don't come for me 🙈 copy it character for character, that's the vibe.

🌸 ARGUMENTS 🌸

  • kcontrol — the ALSA control element in question. this is the main character of the whole function, honestly. everything happens to it.
  • op_flag — the operation code, iykyk. it's a SNDRV_CTL_TLV_OP_XXX situation — that's your little menu of possible ops.
  • size — how big the TLV data is, measured in bytes. not vibes, not hopes, bytes. 🔥
  • utlv — the TLV data itself. this is the payload you're bringing to the party.

💜 CONTEXT 💜

process context. 🫶 that's it, that's the whole note — it runs in process context, so plan accordingly bestie.

⭐ RETURN ⭐

  • 0 on success — slay, we ate, nothing to see here ✨
  • -errno on failure — not slay, something went sideways, and the error is handed back to you in classic negative-errno form 😭

🌈 SEE ALSO 🌈

the kernel file that started it all: ./sound/virtio/virtio_kctl.c

and the whole friend group, fr fr:

also, the directory ./sound/virtio gets a shoutout because that's where the whole crew lives 🏡

that's the page, bestie — every flag, every argument, every return value, nothing skipped, nothing invented. you're so welcome 💖

signed off from ./sound/virtio, dated October 2026 — the Kernel API Manual said see you then, and honestly? iconic. periodt. 🎀🦋💜

📦 where this page comes from