aio_return - get return status of asynchronous I/O operation
ssize_t aio_return(struct aiocb *aiocbp);
Link with -lrt.
The aio_return() function returns the final return status for the
asynchronous I/O request with control block pointed to by aiocbp.
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,
write, or fsync request. Otherwise the return value is undefined. On
error, the error value is returned.
EINVAL 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_cancel(3), aio_error(3), aio_fsync(3), aio_read(3), aio_suspend(3),
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