#include <nng/nng.h> int nng_aio_result(nng_aio *aio);
nng_aio_result() returns the result of the operation associated
with the handle aio.
If the operation was successful, then 0 is returned.
Otherwise a non-zero error code is returned.
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
The result of the operation, either zero on success, or an error number on failure.
The operation timed out.
The operation was canceled.
Various other return values are possible depending on the operation.