v4l2_query_ext_ctrl(9)

📦 version 7.3.1, in nixpkgs unstable

okay bestie, welcome to the v4l2_query_ext_ctrl(9) page from the Kernel API Manual ✨

💖 NAME 💖

v4l2_query_ext_ctrl is literally the helper function that implements the :ref:`VIDIOC_QUERY_EXT_CTRL <vidioc_queryctrl>` ioctl. That's the assignment, and it ate. 💅

✨ SYNOPSIS ✨

int v4l2_query_ext_ctrl (struct v4l2_ctrl_handler *hdl , struct
       v4l2_query_ext_ctrl *qc );

🎀 ARGUMENTS 🎀

  • hdl — pointer to struct v4l2_ctrl_handler. That's the handler bestie.
  • qc — pointer to struct v4l2_query_ext_ctrl. That's the query struct.

🦋 DESCRIPTION 🦋

If hdl == NULL then they will all return -EINVAL. That's the whole note, fr fr — no extra lore. 😭

🌈 SEE ALSO 🌈

Kernel file ./include/media/v4l2-ctrls.h — plus the whole iconic extended friend group:

made with 💖 and zero skipped details by ./include/media · October 2026 · v4l2_query_ext_ctrl(9) 🫶

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