NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | COLOPHON
io_uring_prep_write(3) liburing Manual io_uring_prep_write(3)
io_uring_prep_write_fixed - prepare I/O write request with registered buffer
#include <liburing.h> void io_uring_prep_write_fixed(struct io_uring_sqe *sqe, int fd, const void *buf, unsigned nbytes, __u64 offset, int buf_index);
The io_uring_prep_write_fixed(3) prepares an IO write request with a previously registered IO buffer. 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 and with the buffer matching the registered index of buf_index. This works just like io_uring_prep_write(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.
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.
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-2.1 February 13, 2022 io_uring_prep_write(3)
Pages that refer to this page: io_uring_prep_write_fixed(3), io_uring_register_buffers(3)