v4l2_ctrl_subscribe_event(9)

📦 version 7.3.1, in nixpkgs unstable

✨ v4l2_ctrl_subscribe_event ✨

okay so this is a page from the Kernel API Manual (yes, the kernel has a manual, and yes it's giving very "the documentation is the vibe") 💅 and today we're talking about v4l2_ctrl_subscribe_event — the little function that just wants you to sign up for the notifications, bestie. 🎀

🌸 NAME 🌸

v4l2_ctrl_subscribe_event — subscribes to an event 🫶

🦋 SYNOPSIS 🦋

int v4l2_ctrl_subscribe_event (struct v4l2_fh *fh , const struct
v4l2_event_subscription *sub );

💖 ARGUMENTS 💖

  • fh — pointer to struct v4l2_fh. literally just the file handle struct, handing it over 💅
  • sub — pointer to struct v4l2_event_subscription. this is the "what am i subscribing to" little guy ✨

🌈 DESCRIPTION 🌈

so here's the tea ☕ — this function can be used as a vidioc_subscribe_event function that just subscribes control events. that's it. that's the whole personality. no cap, it subscribes to control events and minds its own business. 👑

🔥 SEE ALSO 🔥

the whole friend group shows up here, and honestly? iconic. 🫶 first up, the kernel file:

  • ./include/media/v4l2-ctrls.h

and then the entire extended cast, no one left out:

okay that's the whole page, mwah 💋 this little drop came straight out of ./include/media, dated October 2026, and it's filed under v4l2_ctrl_subscribe_event(9) — go subscribe to some events, bestie, you got this 🧚✨

📦 where this page comes from