v4l2_ctrl_new_custom(9)

📦 version 7.3.1, in nixpkgs unstable

💅 v4l2_ctrl_new_custom(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: you're deep in kernel-land, you need a custom V4L2 control, and you want it allocated and initialized in one go. That's literally this function. It's giving "do it all in one call" energy and honestly? obsessed. ✨

🌸 NAME 🌸

v4l2_ctrl_new_custom — allocate and initialize a brand-new custom V4L2 control. no cap, that's the whole job 🫶

🦋 SYNOPSIS 🦋

struct v4l2_ctrl * v4l2_ctrl_new_custom (struct v4l2_ctrl_handler *hdl ,
const struct v4l2_ctrl_config *cfg , void *priv );

like yes, that's three args. yes, the return type is a struct v4l2_ctrl *. we stay unbothered 💅

💖 ARGUMENTS 💖

  • hdl — the control handler. the main character of the whole handler situation 👑
  • cfg — the control's configuration data. this is where you tell it what it is 🎀
  • priv — the control's driver-specific private data. your little stash of "this is mine" 🌈

⭐ DESCRIPTION ⭐

so here's the tea ☕ — if the v4l2_ctrl struct could not be allocated, then NULL is returned, and hdl->error gets set to the error code (but only if it wasn't set already, okay? it's not out here overwriting stuff 😭).

fr fr, check that hdl->error field. the NULL return is your vibe check, and hdl->error is the receipts 💀

🔥 SEE ALSO 🔥

all the siblings, cousins and extended family — every single one, bestie, i'm not skipping a single one of these 🧚💜

okay that's the whole page, go forth and allocate responsibly 💅✨

and before you close the tab — this little beauty lives in ./include/media, the manual is dated October 2026, and the page itself is v4l2_ctrl_new_custom(9). mwah 🍓🫶

📦 where this page comes from