v4l2_device_for_each_subdev(9)

📦 version 7.3.1, in nixpkgs unstable

💅 v4l2_device_for_each_subdev(9) — from the Kernel API Manual, bestie

okay so picture this: it's a macro, it's in the kernel, and it's about to loop over every single sub-device like it's scrolling your fyp. Let's get into it 🫶

✨ NAME ✨

v4l2_device_for_each_subdev — a helper macro that iterates over all sub-devices of a given &v4l2_device. literally that's its whole job and it ate 💅

🌸 SYNOPSIS 🌸

v4l2_device_for_each_subdev (sd , v4l2_dev );

🎀 ARGUMENTS 🎀

  • sd — a pointer that the macro fills in with all struct v4l2_subdev pointers; it's used as the iterator by the loop. so yeah, sd is the main character here 👑
  • v4l2_dev — the struct v4l2_device that owns the sub-devices you're iterating over. it's giving parent energy.

🦋 DESCRIPTION 🦋

This macro iterates over every sub-device owned by the v4l2_dev device. It acts as a for loop iterator, and it executes the next statement with the sd variable pointing to each sub-device in turn — one at a time, no skipping, no cap ✨

like, the way that it just hands you each sub-device and lets you do your thing? obsessed.

💜 SEE ALSO 💜

Kernel file ./include/media/v4l2-device.h — and the whole friend group:

ngl, that's a long SEE ALSO. but like, slay for them, they're all iconic 💀

okay that's the whole page, mwah 💖 this one lives in ./include/media, dated October 2026, and the version is literally just v4l2_device_for_each_subdev(9) again because kernel manpages love a self-reference 🎀 byeee, go loop over some sub-devices bestie 🌈

📦 where this page comes from