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)

liburing-2.1                                    November 15, 2021                          io_uring_wait_cqes(3)