Copyright (C) 2021 Stefan Roesch <[email protected]>

SPDX-License-Identifier: LGPL-2.0-or-later

io_uring_wait_cqe_nr - wait for one or more io_uring completion events

 #include <liburing.h> 

 "int io_uring_wait_cqe_nr(struct io_uring *" ring ","  " struct io_uring_cqe **" cqe_ptr ","  " unsigned " wait_nr ");" 

The io_uring_wait_cqe_nr (3) function returns wait_nr IO completion events from the queue belonging to the ring param, waiting for it if necessary. If the requested number of events are 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).

On success io_uring_wait_cqe_nr (3) returns 0 and the cqe_ptr parm 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. io_uring_submit (3), io_uring_wait_cqes (3)