io_uring_wait_cqes - wait for one or more io_uring completion events

       The  io_uring_wait_cqes(3)  function  returns wait_nr IO completions from the queue belonging to the ring
       param, waiting for them if necessary or until the timeout ts expires.

       The sigmask specifies the set of signals to block. If set, it is equivalent to atomically  executing  the
       following calls:

           sigset_t origmask;

           pthread_sigmask(SIG_SETMASK, &sigmask, &origmask);
           ret = io_uring_wait_cqes(ring, cqe, wait_nr, ts, NULL);
           pthread_sigmask(SIG_SETMASK, &origmask, NULL);

       The  cqe_ptr  param  is  filled  in  on  success  with the first CQE. Callers of this function should use
       io_uring_for_each_cqe(3) to iterate all available CQEs.

       If ts is specified and an older kernel without IORING_FEAT_EXT_ARG is used, the application does not need
       to call io_uring_submit(3) before calling io_uring_wait_cqes(3).  For newer  kernels  with  that  feature
       flag set, there is no implied submit when waiting for a request.

       If ts is NULL, then this behaves like io_uring_wait_cqe(3) in that it will wait forever for an event.

       io_uring_wait_cqes - wait for one or more io_uring completion events

       On  success  io_uring_wait_cqes(3)  returns  0  and the cqe_ptr param is filled in. On failure it returns
       -errno.

io_uring_submit(3), io_uring_for_each_cqe(3), io_uring_wait_cqe_timeout(3), io_uring_wait_cqe(3)

liburing-2.1                                    November 15, 2021                          io_uring_wait_cqes(3)

#include<liburing.h>intio_uring_wait_cqes(structio_uring*ring,structio_uring_cqe**cqe_ptr,unsignedwait_nr,struct__kernel_timespec*ts,sigset_t*sigmask);