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io_uring_wait_cqe(3) — Linux manual page

io_uring_wait_cqe(3)         liburing Manualio_uring_wait_cqe(3)

NAME        top

       io_uring_wait_cqe - wait for one io_uring completion event

SYNOPSIS        top

#include <liburing.h>int io_uring_wait_cqe(struct io_uring *ring,struct io_uring_cqe **cqe_ptr);

DESCRIPTION        top

       Theio_uring_wait_cqe(3) function waits for an IO completion from       the queue belonging to thering param, waiting for it if       necessary. If an event is already available in the ring when       invoked, no waiting will occur. Thecqe_ptr param is filled in on       success.       After the caller has submitted a request withio_uring_submit(3),       the application can retrieve the completion withio_uring_wait_cqe(3).

RETURN VALUE        top

       On successio_uring_wait_cqe(3) returns 0 and the cqe_ptr param is       filled in. On failure it returns-errno.  The return value       indicates the result of waiting for a CQE, and it has no relation       to the CQE result itself.

SEE ALSO        top

io_uring_submit(3),io_uring_wait_cqe_timeout(3),io_uring_wait_cqes(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_wait_cqe(3)

Pages that refer to this page:io_uring_cq_advance(3), io_uring_cqe_get_data(3), io_uring_cqe_get_data64(3), io_uring_cqe_seen(3), io_uring_cq_ready(3), io_uring_for_each_cqe(3), io_uring_peek_batch_cqe(3), io_uring_peek_cqe(3), io_uring_register_clock(3), io_uring_sqring_wait(3), io_uring_submit_and_wait_min_timeout(3), io_uring_submit_and_wait_timeout(3), io_uring_wait_cqe(3), io_uring_wait_cqe_nr(3), io_uring_wait_cqes(3), io_uring_wait_cqes_min_timeout(3), io_uring_wait_cqe_timeout(3)

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