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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_register_files(3) liburing Manual io_uring_register_files(3)
io_uring_register_files - register file descriptors
#include <liburing.h>
int io_uring_register_files(struct io_uring *ring,
const int *files,
unsigned nr_files);
int io_uring_register_files_sparse(struct io_uring *ring,
unsigned nr_files);
The io_uring_register_files(3) function registers nr_files number
of file descriptors defined by the array files belonging to the
ring for subsequent operations.
The io_uring_register_files_sparse(3) function registers an empty
file table of nr_files number of file descriptors. The sparse
variant is available in kernels 5.19 and later.
Registering a file table is a prerequisite for using any request
that uses direct descriptors.
Registered files have less overhead per operation than normal
files. This is due to the kernel grabbing a reference count on a
file when an operation begins, and dropping it when it's done.
When the process file table is shared, for example if the process
has ever created any threads, then this cost goes up even more.
Using registered files reduces the overhead of file reference
management across requests that operate on a file.
On success io_uring_register_files(3) and
io_uring_register_files_sparse(3) return 0. On failure they
return -errno.
io_uring_get_sqe(3), io_uring_unregister_files(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 io-uring@vger.kernel.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
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liburing-2.1 November 15, 2021 io_uring_register_files(3)
Pages that refer to this page: io_uring_prep_accept(3), io_uring_prep_accept_direct(3), io_uring_prep_multishot_accept(3), io_uring_prep_multishot_accept_direct(3), io_uring_prep_openat2(3), io_uring_prep_openat2_direct(3), io_uring_prep_openat(3), io_uring_prep_openat_direct(3), io_uring_prep_socket(3), io_uring_prep_socket_direct(3), io_uring_prep_socket_direct_alloc(3), io_uring_register_file_alloc_range(3), io_uring_register_files(3), io_uring_register_files_sparse(3), io_uring_register_ring_fd(3), io_uring_unregister_files(3), io_uring_unregister_ring_fd(3)
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