NAME

       io_uring_wait_cqes - wait for one or more io_uring completion events

SYNOPSIS

       #include <liburing.h>

       int io_uring_wait_cqes(struct io_uring *ring,
                              struct io_uring_cqe **cqe_ptr,
                              unsigned wait_nr,
                              struct __kernel_timespec *ts,
                              sigset_t *sigmask);

DESCRIPTION

       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.

RETURN VALUE

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

SEE ALSO

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