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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | COLOPHON |
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io_uring_prep_read(3) liburing Manual io_uring_prep_read(3)
io_uring_prep_read_fixed - prepare I/O read request with
registered buffer
#include <liburing.h>
void io_uring_prep_read_fixed(struct io_uring_sqe *sqe,
int fd,
void *buf,
unsigned nbytes,
__u64 offset,
int buf_index);
The io_uring_prep_read_fixed(3) prepares an IO read request with
a previously registered IO buffer. The submission queue entry sqe
is setup to use the file descriptor fd to start reading nbytes
into the buffer buf at the specified offset, and with the buffer
matching the registered index of buf_index.
This works just like io_uring_prep_read(3) except it requires the
use of buffers that have been registered with
io_uring_register_buffers(3). The buf and nbytes arguments must
fall within a region specified by buf_index in the previously
registered buffer. The buffer need not be aligned with the start
of the registered buffer.
After the read has been prepared it can be submitted with one of
the submit functions.
None
The CQE res field will contain the result of the operation. See
the related man page for details on possible values. Note that
where synchronous system calls will return -1 on failure and set
errno to the actual error value, io_uring never uses errno.
Instead it returns the negated errno directly in the CQE res
field.
io_uring_prep_read(3), io_uring_register_buffers(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 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-03.) 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-2.1 February 13, 2022 io_uring_prep_read(3)
Pages that refer to this page: io_uring_prep_read_fixed(3), io_uring_register_buffers(3), io_uring_register_buffers_sparse(3), io_uring_register_buffers_tags(3), io_uring_register_buffers_update_tag(3)
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HTML rendering created 2024-06-26 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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