NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON
io_uring_register_buffers(3) liburing Manualio_uring_register_buffers(3)
io_uring_register_buffers - register buffers for fixed buffer operations
#include <liburing.h> int io_uring_register_buffers(struct io_uring *ring, const struct iovec *iovecs, unsigned nr_iovecs); int io_uring_register_buffers_sparse(struct io_uring *ring, unsigned nr_iovecs);
The io_uring_register_buffers(3) function registers nr_iovecs number of buffers defined by the array iovecs belonging to the ring. The io_uring_register_buffers_sparse(3) function registers nr_iovecs empty buffers belonging to the ring. These buffers must be updated before use, using eg io_uring_register_buffers_update_tag(3). After the caller has registered the buffers, they can be used with one of the fixed buffers functions. Registered buffers is an optimization that is useful in conjunction with O_DIRECT reads and writes, where it maps the specified range into the kernel once when the buffer is registered rather than doing a map and unmap for each IO every time IO is performed to that region. Additionally, it also avoids manipulating the page reference counts for each IO.
On success io_uring_register_buffers(3) and io_uring_register_buffers_sparse(3) return 0. On failure they return -errno.
io_uring_get_sqe(3), io_uring_unregister_buffers(3), io_uring_register_buf_ring(3), io_uring_prep_read_fixed(3), io_uring_prep_write_fixed(3)
This page is part of the liburing (A library for io_uring) project. Information about the project can be found at ⟨https://github.com/axboe/liburing⟩. If you have a bug report for this manual page, send it to firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://github.com/axboe/liburing⟩ on 2022-12-17. (At that time, the date of the most recent commit that was found in the repository was 2022-12-12.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com liburing-2.1 November 15, 2021io_uring_register_buffers(3)
Pages that refer to this page: io_uring_prep_read_fixed(3), io_uring_prep_write_fixed(3), io_uring_register_buffers(3), io_uring_sqe_set_flags(3), io_uring_unregister_buffers(3)