NAME

       nng_aio_count - return number of bytes transferred

SYNOPSIS

           #include <nng/nng.h>

           size_t nng_aio_count(nng_aio *aio);

DESCRIPTION

       The nng_aio_count() returns the number of bytes transferred by the asynchronous operation associated with
       the handle aio.

       Some asynchronous operations do not provide meaningful data for this function; for example operations
       that establish connections do not transfer user data (they may transfer protocol data though) — in this
       case this function will generally return zero.

       This function is most useful when used with operations that make use of of a scatter/gather vector (set
       by nng_aio_set_iov()).

           Note

           The return value from this function is undefined if the operation has not completed yet. Either call
           this from the handle’s completion callback, or after waiting for the operation to complete with
           nng_aio_wait().

RETURN VALUES

       The number of bytes transferred by the operation.

ERRORS

       None.

SEE ALSO

       nng_aio_alloc(3), nng_aio_result(3), nng_aio_set_iov(3), nng_aio_wait(3), nng_strerror(3), nng_aio(5),
       nng(7)

                                                   2025-04-20                                   NNG_AIO_COUNT(3)