io_uring_wait_cqe(3)            liburing Manual           io_uring_wait_cqe(3)

NAME
       io_uring_wait_cqe - wait for one io_uring completion event

SYNOPSIS
       #include <liburing.h>

       int io_uring_wait_cqe(struct io_uring *ring,
                             struct io_uring_cqe **cqe_ptr);

DESCRIPTION
       The io_uring_wait_cqe(3) function waits for an IO completion from the
       queue belonging to the ring param, waiting for it if necessary. If an
       event is already available in the ring when invoked, no waiting will
       occur. The cqe_ptr param is filled in on success.

       After the caller has submitted a request with io_uring_submit(3), the
       application can retrieve the completion with io_uring_wait_cqe(3).


RETURN VALUE
       On success io_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
       io_uring_submit(3), io_uring_wait_cqe_timeout(3), io_uring_wait_cqes(3)

liburing-2.1                   November 15, 2021          io_uring_wait_cqe(3)