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. (See aio(7) for a description of the aiocb structure.)
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 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.
The aio_return() function is available since glibc 2.1.
The aio_return() function is thread-safe.
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