virtsnd_ctl_query_info(9)

📦 version 7.3.1, in nixpkgs unstable

💅 virtsnd_ctl_query_info — from the Kernel API Manual

okay so bestie, welcome to virtsnd_ctl_query_info(9) — the little kernel function that walks up to your VirtIO sound device and is like "hey, tell me about your items bestie 🎀". It's giving query the item configuration from the device, and honestly? Iconic behaviour.

✨ SYNOPSIS ✨

int virtsnd_ctl_query_info (struct virtio_snd *snd , int command , int
start_id , int count , size_t size , void *info );

six whole parameters, no cap. let's meet them 🫶

🌸 ARGUMENTS 🌸

  • snd — your VirtIO sound device. the main character, literally.
  • command — the control request code, written as VIRTIO_SND_R_XXX_INFO in the manual. this is you telling the device what kind of info you want. iykyk.
  • start_id — the item start identifier. where the little shopping spree begins 🛍️
  • count — how many items you wanna query. no, you can't have "all of them", pick a number bestie.
  • size — the item information size, measured in bytes. units matter, don't be messy.
  • info — a buffer for storing the item information. this is where the answers go. she's an empty vessel waiting to be filled with knowledge ✨

🦋 CONTEXT 🦋

Any context that permits to sleep. yes girl, sleep — this one's allowed to nap, so don't call her from somewhere that can't 😴💤

👑 RETURN 👑

  • 0 on success 🎉 slay
  • -errno on failure 😭 it's giving error code

🔥 SEE ALSO 🔥

Kernel file ./sound/virtio/virtio_ctl_msg.c — plus the whole friend group:

like, the entire group chat. go read them, fr fr.

bestie reminder: info has to actually be big enough for count items of size bytes each. the manual doesn't spell out the drama, but you know how buffers are 🙈

mwah 💋 that's the whole page — brought to you from ./sound/virtio, dated October 2026, same as ever. go query something iconic 🧚‍♀️💜

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