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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | COLOPHON |
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io_uring_prep_write(3) liburing Manual io_uring_prep_write(3)
io_uring_prep_write - prepare I/O write request
#include <liburing.h>
void io_uring_prep_write(struct io_uring_sqe *sqe,
int fd,
const void *buf,
unsigned nbytes,
__u64 offset);
The io_uring_prep_write(3) prepares an IO write request. The
submission queue entry sqe is setup to use the file descriptor fd
to start writing nbytes from the buffer buf at the specified
offset.
On files that support seeking, if the offset is set to -1, the
write operation commences at the file offset, and the file offset
is incremented by the number of bytes written. See write(2) for
more details. Note that for an async API, reading and updating
the current file offset may result in unpredictable behavior,
unless access to the file is serialized. It is not encouraged to
use this feature if it's possible to provide the desired IO
offset from the application or library.
On files that are not capable of seeking, the offset must be 0 or
-1.
After the write 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_get_sqe(3), io_uring_submit(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 2023-12-22. (At that
time, the date of the most recent commit that was found in the
repository was 2023-12-19.) 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 November 15, 2021 io_uring_prep_write(3)
Pages that refer to this page: io_uring_prep_write(3), io_uring_prep_write_fixed(3), io_uring_prep_writev2(3), io_uring_prep_writev(3)
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HTML rendering created 2023-12-22 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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