| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
Single UNIX Specification, Version 2 |
both | OS/390 V2R7 |
#define _XOPEN_SOURCE 500
#include <aio.h>
int aio_return(const struct aiocb *aiocbp);The aio_return() function returns the return status associated with the aiocb structure referenced by the aiocbp argument. The return status for an asynchronous I/O operation is the value that would be set by the corresponding read() or write() operation. While the operation is proceeding, the error status retrieved by aio_error() is EINPROGRESS; the return status retrieved by aio_return() however is unpredictable. The aio_return() function may be called to retrieve the return status of a given asynchronous operation; once aio_error() has returned with 0.
If the asynchronous I/O operation has completed successfully, aio_return() returns the status as described for read() or write().
If the asynchronous I/O operation has not yet completed, then the return status is unpredictable.
aio_return() does not set errno.