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io_uring_cqe_get_data(3) — Linux manual page

io_uring_cqe_get_data(3)     liburing Manualio_uring_cqe_get_data(3)

NAME        top

       io_uring_cqe_get_data - get user data for completion event

SYNOPSIS        top

#include <liburing.h>void *io_uring_cqe_get_data(struct io_uring_cqe *cqe);__u64 io_uring_cqe_get_data64(struct io_uring_cqe *cqe);

DESCRIPTION        top

       Theio_uring_cqe_get_data(3) function returns the user_data with       the completion queue entrycqe as a data pointer.       Theio_uring_cqe_get_data64(3) function returns the user_data with       the completion queue entrycqe as a 64-bit data value.       After the caller has received a completion queue entry (CQE) withio_uring_wait_cqe(3), the application can callio_uring_cqe_get_data(3) orio_uring_cqe_get_data64(3) function to       retrieve theuser_data value. This requires thatuser_data has       been set earlier with the functionio_uring_sqe_set_data(3) orio_uring_sqe_set_data64(3).

RETURN VALUE        top

       If theuser_data value has been set before submitting the request,       it will be returned.  Otherwise, the return value is undefined.

SEE ALSO        top

io_uring_get_sqe(3),io_uring_sqe_set_data(3),io_uring_sqe_submit(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_cqe_get_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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