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_error — retrieve errors status for an asynchronous I/O operation
int aio_error(const struct aiocb *aiocbp);
The aio_error() function shall return the error status associated with
the aiocb structure referenced by the aiocbp argument. The error
status for an asynchronous I/O operation is the errno value that would
be set by the corresponding read(), write(), fdatasync(),
or fsync() operation. If the operation has not yet completed, then the
error status shall be equal to [EINPROGRESS].
If the aiocb structure pointed to by aiocbp is not
associated with an operation that has been scheduled, the results are
If the asynchronous I/O operation has completed successfully, then 0 shall be
returned. If the asynchronous operation has completed unsuccessfully, then the
error status, as described for read(), write(),
fdatasync(), and fsync(), shall be returned. If the asynchronous
I/O operation has not yet completed, then [EINPROGRESS] shall be
If the aio_error() function fails, it shall return -1 and
set errno to indicate the error.
The aio_error() 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_cancel(), aio_fsync(), aio_read(),
aio_return(), aio_write(), close(),
exec, exit(), fork(),
lio_listio(), lseek(), read()
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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