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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_re...alloc_range(3) liburing Manual io_uring_re...alloc_range(3)
io_uring_register_file_alloc_range - set range for fixed file
allocations
#include <liburing.h>
int io_uring_register_file_alloc_range(struct io_uring *ring,
unsigned off,
unsigned len);
The io_uring_register_file_alloc_range(3) function sets the
allowable range for fixed file index allocations within the
kernel. When requests that can instantiate a new fixed file are
used with IORING_FILE_INDEX_ALLOC , the application is asking the
kernel to allocate a new fixed file descriptor rather than pass in
a specific value for one. By default, the kernel will pick any
available fixed file descriptor within the range available.
Calling this function with off set to the starting offset and len
set to the number of descriptors, the application can limit the
allocated descriptors to that particular range. This effectively
allows the application to set aside a range just for dynamic
allocations, with the remainder being used for specific values.
The application must have registered a fixed file table upfront,
eg through io_uring_register_files(3) or
io_uring_register_files_sparse(3).
Available since 6.0.
On success io_uring_register_file_alloc_range(3) returns 0. On
failure it returns -errno.
io_uring_register_files(3) io_uring_prep_accept_direct(3)
io_uring_prep_openat_direct(3) io_uring_prep_socket_direct(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 2025-08-11. (At that time,
the date of the most recent commit that was found in the
repository was 2025-08-02.) 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
man-pages@man7.org
liburing-2.3 Oct 21, 2022 io_uring_re...alloc_range(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_register_file_alloc_range(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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