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 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.
The aio_return() function may fail if:
- The aiocbp argument does not refer to an asynchronous operation
whose return status has not yet been retrieved.
The following sections are informative.
aio_write(), close(), exec,
exit(), fork(), lio_listio(),
The Base Definitions volume of POSIX.1‐2017,
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1-2017, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018
Edition, Copyright (C) 2018 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 original
Standard can be obtained online at http://www.opengroup.org/unix/online.html .
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