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#include <aio.h>ssize_t aio_return( struct aiocb *aiocbptr );
libc
The aio_return() function returns the return status associated with the struct aiocb referenced by the aiocbptr argument. The return status for an asynchronous I/O operation is the value that's returned by the corresponding read(), write(), or fsync() operation.
You can call aio_return() exactly once to retrieve the return status of a given asynchronous operation; if you use the same struct aiocb for the same operation in a call to aio_return() or aio_error(), an error may be returned.
The value that's returned by the corresponding read(), write(), or fsync() operation.
POSIX 1003.1 AIO
The first time you call an aio_*() function, a thread pool is created, making your process multithreaded if it isn't already. The thread pool isn't destroyed until your process ends.
aio_cancel(), aio_error(), aio_fsync(), aio_read(), aio_suspend(), aio_write(), struct aiocb, fsync(), read(), write(),
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