AIO_RETURN(3POSIX) POSIX Programmer's Manual AIO_RETURN(3POSIX)
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of
this interface may differ (consult the corresponding Linux manual page for details of
Linux behavior), or the interface may not be implemented on Linux.
aio_return — retrieve return status of an asynchronous I/O operation
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.
If the aio_return() function fails, it shall return −1 and set errno to indicate the
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.
aio_cancel(), aio_error(), aio_fsync(), aio_read(), aio_write(), close(), exec, exit(),
fork(), lio_listio(), lseek(), read()
The Base Definitions volume of POSIX.1‐2008, <aio.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrep‐
ancy 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 original Standard can be
obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are most likely to have
been introduced during the conversion of the source files to man page format. To report
such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 AIO_RETURN(3POSIX)