vb2_core_querybuf(9)

💖 vb2_core_querybuf — query video buffer information, bestie 💖

okay so you're in the Kernel API Manual, and this page is vb2_core_querybuf(9). She's a little helper with main-character energy, and we're gonna get you fluent in her whole deal. No cap. 🫶

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🌸 NAME 🌸

vb2_core_querybuf — query video buffer information.

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✨ SYNOPSIS ✨

void vb2_core_querybuf (struct vb2_queue *q , struct vb2_buffer *vb ,
       void *pb );

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🎀 ARGUMENTS 🎀

• q — pointer to struct vb2_queue with videobuf2 queue. That's the queue girlie.
• vb — pointer to struct vb2_buffer.
• pb — buffer struct passed from userspace.

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🦋 DESCRIPTION 🦋

So vb2_core_querybuf is the Videobuf2 core helper to implement the VIDIOC_QUERYBUF operation. It is called internally by VB2 by an API-specific handler, like videobuf2-v4l2.h. iykyk, it's an internal-supporting-character situation.

The passed buffer should have been verified. That's the vibe check, bestie — don't skip it.

This function fills the relevant information for the userspace. That's literally her whole moment. ✨

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🌈 RETURN 🌈

returns zero on success; an error code otherwise.

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👑 SEE ALSO 👑

The whole squad, in the original order:

• Kernel file: ./include/media/videobuf2-core.h
• enum vb2_memory(9)
• struct vb2_mem_ops(9)
• struct vb2_plane(9)
• enum vb2_io_modes(9)
• enum vb2_buffer_state(9)
• struct vb2_buffer(9)
• struct vb2_ops(9)
• struct vb2_buf_ops(9)
• struct vb2_queue(9)
• vb2_queue_allows_cache_hints(9)
• vb2_plane_vaddr(9)
• vb2_plane_cookie(9)
• vb2_buffer_done(9)
• vb2_discard_done(9)
• vb2_wait_for_all_buffers(9)
• vb2_core_reqbufs(9)
• vb2_core_create_bufs(9)
• vb2_core_prepare_buf(9)
• vb2_core_remove_bufs(9)
• vb2_core_qbuf(9)
• vb2_core_dqbuf(9)
• vb2_core_streamon(9)
• vb2_core_streamoff(9)
• vb2_core_expbuf(9)
• vb2_core_queue_init(9)
• vb2_core_queue_release(9)
• vb2_queue_error(9)
• vb2_mmap(9)
• vb2_get_unmapped_area(9)
• vb2_core_poll(9)
• vb2_read(9)
• vb2_write(9)
• vb2_thread_fnc(9)
• vb2_thread_start(9)
• vb2_thread_stop(9)
• vb2_is_streaming(9)
• vb2_fileio_is_active(9)
• vb2_get_num_buffers(9)
• vb2_is_busy(9)
• vb2_get_drv_priv(9)
• vb2_set_plane_payload(9)
• vb2_get_plane_payload(9)
• vb2_plane_size(9)
• vb2_start_streaming_called(9)
• vb2_clear_last_buffer_dequeued(9)
• vb2_get_buffer(9)
• vb2_buffer_in_use(9)
• vb2_verify_memory_type(9)
• vb2_request_object_is_buffer(9)
• vb2_request_buffer_cnt(9)

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byeee 🫶 source/version: ./include/media, date: October 2026, page: vb2_core_querybuf(9) 💅