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.
The aio_return() function shall return 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 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 error.
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 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 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
IEEE/The Open Group 2013 AIO_RETURN(3P)