NAME

       io_uring_peek_cqe - check if an io_uring completion event is available

SYNOPSIS

       #include <liburing.h>

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

DESCRIPTION

       The io_uring_peek_cqe(3) function returns an IO completion from the queue belonging to the
       ring param, if one is readily available. On successful return,  cqe_ptr  param  is  filled
       with a valid CQE entry.

       This function does not enter the kernel to wait for an event, an event is only returned if
       it's already available in the CQ ring.

RETURN VALUE

       On success io_uring_peek_cqe(3) returns 0 and the  cqe_ptr  parameter  is  filled  in.  On
       failure it returns -EAGAIN.

SEE ALSO

       io_uring_submit(3), io_uring_wait_cqes(3), io_uring_wait_cqe(3)