aio_return - get return status of asynchronous I/O operation
ssize_t aio_return(struct aiocb *
This function should be called only once for any given request, after aio_error(3) returns something other than EINPROGRESS.
If the asynchronous I/O operation has completed, this function returns the value that would have been returned in case of a synchronous read(2), write(2), fsync(2) or fdatasync(2), call. On error, -1 is returned, and
errno is set appropriately.
If the asynchronous I/O operation has not yet completed, the return value and effect of aio_return() are undefined.
aiocbp does not point at a control block for an asynchronous I/O request of which the return status has not been retrieved yet.
aio_return() is not implemented.
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