NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON
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_buf_ring(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 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-2.3 Oct 21i,o_2u0r2i2ng_register_file_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)