Get the return status for an asynchronous I/O operation
#include <aio.h> ssize_t aio_return( struct aiocb * aiocbptr );
- A pointer to an asynchronous I/O control block of type aiocb whose return status you want to get.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The aio_return() function returns the return status associated with the aiocb structure 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 aiocb structure for the same operation in a call to aio_return() or aio_error() , an error may be returned.
- The aiocbptr argument doesn't refer to an asynchronous operation whose return status hasn't yet been retrieved.
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.