AIO_RETURN(P) POSIX Programmer's Manual AIO_RETURN(P)
aio_return - retrieve return status of an asynchronous I/O operation (REALTIME)
ssize_t aio_return(struct aiocb *aiocbp);
The aio_return() function shall return the return status associated with the aiocb struc-
ture referenced by the aiocbp argument. The return status for an asynchronous I/O opera-
tion is the value that would be returned by the corresponding read(), write(), or fsync()
function call. If the error status for the operation is equal to [EINPROGRESS], then the
return status for the operation is undefined. The aio_return() function may be called
exactly once to retrieve the return status of a given asynchronous operation; thereafter,
if the same aiocb structure is used in a call to aio_return() or aio_error(), an error may
be returned. When the aiocb structure referred to by aiocbp is used to submit another
asynchronous operation, then aio_return() may be successfully used to retrieve the return
status of that operation.
If the asynchronous I/O operation has completed, then the return status, as described for
read(), write(), and fsync(), shall be returned. If the asynchronous I/O operation has not
yet completed, the results of aio_return() are undefined.
The aio_return() function may fail if:
EINVAL The aiocbp argument does not refer to an asynchronous operation whose return status
has not yet been retrieved.
The following sections are informative.
The aio_return() function is part of the Asynchronous Input and Output option and need not
be available on all implementations.
aio_cancel() , aio_error() , aio_fsync() , aio_read() , aio_write() , close() , exec() ,
exit() , fork() , lio_listio() , lseek() , read() , the Base Definitions volume of
IEEE Std 1003.1-2001, <aio.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 AIO_RETURN(P)