vb2_write(9)

💖 NAME 💖

okay so this is vb2_write, straight from the Kernel API Manual, and it implements write() syscall logic. that's the whole name section, periodt 💅

🌸 SYNOPSIS 🌸

no cap, here's the signature exact:

ssize_t vb2_write (struct vb2_queue *q , const char __user *data ,
       size_t count , loff_t *ppos , int nonblock );

✨ ARGUMENTS ✨

• q — pointer to struct vb2_queue with videobuf2 queue. the queue is lowkey the main character here 👑
• data — pointed to target userspace buffer. that's the wording, bestie 🫶
• count — number of bytes to write. literally the byte count 💅
• ppos — file handle position tracking pointer. it's tracking the position, iykyk 📍
• nonblock — mode selector (1 means blocking calls, 0 means nonblocking). yes, that mapping is what the page says — don't come for me 💀

🦋 SEE ALSO 🦋

Kernel file: ./include/media/videobuf2-core.h — and then the whole cross-ref squad, all present and accounted for:

• 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_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_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)

okay that's the page, bestie! source/version is ./include/media, dated October 2026, signing off from your vb2_write(9) bestie 💋 slay responsibly