vb2_expbuf(9)

💅 vb2_expbuf — it's a whole kernel API manual moment

Okay bestie, so we're in vb2_expbuf(9) territory — section 9, Kernel API Manual, that's the kernel-internals girlies. And the name literally tells you everything: vb2_expbuf — Export a buffer as a file descriptor. Iconic, honestly. 🦋

---

✨ NAME ✨

vb2_expbuf — export a buffer as a file descriptor. That's the whole vibe. One job, does it, periodt. 💖

---

🌸 SYNOPSIS 🌸

int vb2_expbuf (struct vb2_queue *q , struct v4l2_exportbuffer *eb );

Copy it exactly like that, spacing and all — no cap, this is the real signature, not me being quirky. 🎀

---

🧚 ARGUMENTS 🧚

• q — pointer to struct vb2_queue with the videobuf2 queue. Like, this is the queue, the main character of the whole operation. 👑
• eb — the export buffer structure, passed from userspace into your driver's v4l2_ioctl_ops->vidioc_expbuf handler. So userspace hands it over, your handler catches it, and here we are. 🫶

---

💜 DESCRIPTION 💜

Okay so the important lore: the return values from this function are intended to be directly returned from the v4l2_ioctl_ops->vidioc_expbuf handler in your driver.

No wrapping, no remixing, no "let me translate this error code into my own special little guy" — you just hand it straight back up. That's the whole design. Slay. ✨

---

🔥 SEE ALSO 🔥

Kernel file ./include/media/videobuf2-v4l2.h, plus the whole friend group — struct vb2_v4l2_buffer(9) and the rest of the vb2 girlies:

• struct vb2_v4l2_buffer(9)
• vb2_find_buffer(9)
• vb2_querybuf(9)
• vb2_reqbufs(9)
• vb2_create_bufs(9)
• vb2_prepare_buf(9)
• vb2_qbuf(9)
• vb2_dqbuf(9)
• vb2_streamon(9)
• vb2_streamoff(9)
• vb2_queue_init(9)
• vb2_queue_init_name(9)
• vb2_queue_release(9)
• vb2_queue_change_type(9)
• vb2_poll(9)
• vb2_queue_is_busy(9)
• vb2_video_unregister_device(9)

All seventeen of them, bestie. I counted. Not one skipped. 💅

---

🌈 the sign-off 🌈

That's the whole page, fr fr — and it lives at ./include/media, dated October 2026, under the title vb2_expbuf(9). Go export those buffers, you absolute icon. 🍓💖⭐