vb2_queue_is_busy(9)

📦 version 7.3.1, in nixpkgs unstable

💅 vb2_queue_is_busy — check if the queue is busy

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little function with big "is this seat taken?" energy and honestly it's iconic for how much drama one bool can carry 🎀

🌸 SYNOPSIS 🌸

bool vb2_queue_is_busy (struct vb2_queue *q , struct file *file );

literally just returns a bool — yes or no, busy or not busy, no in-between, no vibes-based guessing 💅

🦋 ARGUMENTS 🦋

  • q — pointer to struct vb2_queue with the videobuf2 queue. this is the queue we're doing a vibe check on 👑
  • file — the file through which the vb2 queue access is performed. like, who is trying to touch the queue rn 🙈

✨ DESCRIPTION ✨

so here's the tea, bestie 🍓 the queue is considered busy if it has an owner and that owner is not the file. that's it. that's the whole rule. no cap 💀

queue ownership is acquired and checked by some of the v4l2_ioctl_ops helpers below — those are the main character handlers doing the heavy lifting 🌈

drivers can also use this function directly when they need to open-code ioctl handlers, for instance to add additional checks between the queue ownership test and the call to the corresponding vb2 operation 🔥 so if you're hand-rolling your own handler and you want to sneak an extra check in that little gap between the ownership test and the vb2 call, this is your girl 🫶

lowkey important: it's has an owner AND owner is not the file — both conditions, bestie. one without the other doesn't count ✋

👑 SEE ALSO 👑

Kernel file ./include/media/videobuf2-v4l2.h — plus this whole friend group of functions that all show up to the same party 💜

and that's the whole page, bestie!! 🧚 from ./include/media, dated October 2026 — go forth and check your queues, mwah 💖🎀

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