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io_uring_sqe_set_data(3) — Linux manual page

io_uring_sqe_set_data(3)     liburing Manualio_uring_sqe_set_data(3)

NAME        top

       io_uring_sqe_set_data - set user data for submission queue event

SYNOPSIS        top

#include <liburing.h>void io_uring_sqe_set_data(struct io_uring_sqe *sqe,void *user_data);void io_uring_sqe_set_data64(struct io_uring_sqe *sqe,__u64data);

DESCRIPTION        top

       Theio_uring_sqe_set_data(3) function stores auser_data pointer       with the submission queue entrysqe.       Theio_uring_sqe_set_data64(3) function stores a 64-bitdata value       with the submission queue entrysqe.       After the caller has requested a submission queue entry (SQE) withio_uring_get_sqe(3), they can associate a data pointer or value       with the SQE. Once the completion arrives, the functionio_uring_cqe_get_data(3) orio_uring_cqe_get_data64(3) can be       called to retrieve the data pointer or value associated with the       submitted request.       Note that if neither of these functions are called, or theuser_data field in thesqe isn't set manually either, then the       field may contain a value from a previous use of this sqe. If an       application relies on always having a validuser_data value       present, it must always assign one to each sqe.

RETURN VALUE        top

       None

SEE ALSO        top

io_uring_get_sqe(3),io_uring_cqe_get_data(3)

COLOPHON        top

       This page is part of theliburing (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 isnot part of the original manual page), send a mail to       man-pages@man7.orgliburing-2.1                November 15, 2021io_uring_sqe_set_data(3)

Pages that refer to this page:io_uring_cqe_get_data(3), io_uring_cqe_get_data64(3), io_uring_get_sqe(3), io_uring_sqe_set_data(3), io_uring_sqe_set_data64(3)

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