vb2_core_expbuf(9)

💅 vb2_core_expbuf(9): expbuf bestie 💅

okay so you're on the Kernel API Manual page for vb2_core_expbuf, and bestie, this one is literally about exporting a buffer as a file descriptor. no cap, that's the whole vibe ✨

🌸 NAME 🌸

vb2_core_expbuf — Export a buffer as a file descriptor. 💖

✨ SYNOPSIS ✨

int vb2_core_expbuf (struct vb2_queue *q , int *fd , unsigned int type ,
       struct vb2_buffer *vb , unsigned int plane , unsigned int flags );

🎀 ARGUMENTS 🎀

• q — pointer to struct vb2_queue with videobuf2 queue. 👑
• fd — pointer to the file descriptor associated with DMABUF (set by driver). 🫶
• type — buffer type.
• vb — pointer to struct vb2_buffer.
• plane — index of the plane to be exported, 0 for single plane queues.
• flags — file flags for newly created file, as defined at include/uapi/asm-generic/fcntl.h. Currently, the only used flag is O_CLOEXEC. is supported, refer to manual of open syscall for more details.

🦋 DESCRIPTION 🦋

Videobuf2 core helper to implement VIDIOC_EXPBUF operation. It is called internally by VB2 by an API-specific handler, like videobuf2-v4l2.h. 💖

🌈 RETURN 🌈

returns zero on success; an error code otherwise. ⭐

🔥 SEE ALSO 🔥

Kernel file ./include/media/videobuf2-core.h plus the whole friend group:

• 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_querybuf(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_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)

made with 💖 in the ./include/media source/version corner, dated October 2026, for vb2_core_expbuf(9) — mwah! 🫶💅