.Sh RETURN VALUES
If the asynchronous I/O request has completed successfully,
.Fn aio_error
returns 0. If the request has not yet completed,
.Er EINPROGRESS
.Sh RETURN VALUES
If the asynchronous I/O request has completed successfully,
.Fn aio_error
returns 0. If the request has not yet completed,
.Er EINPROGRESS