v4l2_ctrl_g_ctrl(9)

📦 version 7.3.1, in nixpkgs unstable

💅 v4l2_ctrl_g_ctrl(9) — from the Kernel API Manual, bestie ✨

okay so this is a page straight out of the Kernel API Manual, and it's about one tiny helper function that goes and fetches a control's value for you. no cap, it's short, but you do need to know the rules or you'll have a bad time 🫶

🌸 NAME 🌸

v4l2_ctrl_g_ctrl — the helper function that gets the control's value from inside a driver. literally just that 💖

⭐ SYNOPSIS ⭐

s32 v4l2_ctrl_g_ctrl (struct v4l2_ctrl *ctrl );

that's it. that's the whole signature. icon behavior honestly 👑

🎀 ARGUMENTS 🎀

  • ctrl — the control. like, the actual control you want the value of. that one 💅

🦋 DESCRIPTION 🦋

so what it does is return the control's value safely — and the way it stays safe is by going through the control framework instead of, idk, reaching in and grabbing the field yourself like a gremlin 🙈

⚠️ big one: this function will lock the control's handler. which means you cannot use it from within the v4l2_ctrl_ops functions. deadlock city, population: you 💀

also important: this function is for integer type controls only. that's the whole vibe check. if your control isn't an integer type, this is not the function for you, bestie, no cap ✨

💜 SEE ALSO 💜

the whole extended friend group, fr fr — go say hi 🌈

and that's the page, babes 💖 it lives over in ./include/media, dated October 2026 — so like, remember it fondly, mwah 🎀✨🫶

📦 where this page comes from