NAME

aio_error - retrieve errors status for an asynchronous I/O operation (REALTIME)

SYNOPSIS

[AIO] #include <aio.h>

int aio_error(const struct aiocb *aiocbp);

DESCRIPTION

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(), ^[SIO] fdatasync(), or fsync() operation. If the operation has not yet completed, then the error status shall be equal to [EINPROGRESS].

RETURN VALUE

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(), ^[SIO] fdatasync(), and fsync(), shall be returned. If the asynchronous I/O operation has not yet completed, then [EINPROGRESS] shall be returned.

ERRORS

The aio_error() function may fail if:

[EINVAL]

The aiocbp argument does not refer to an asynchronous operation whose return status has not yet been retrieved.

EXAMPLES

None.

APPLICATION USAGE

The aio_error() function is part of the Asynchronous Input and Output option and need not be available on all implementations.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

aio_cancel() , aio_fsync() , aio_read() , aio_return() , aio_write() , close() , exec() , exit() , fork() , lio_listio() , lseek() , read() , the Base Definitions volume of IEEE Std 1003.1-2001, <aio.h>

CHANGE HISTORY

First released in Issue 5. Included for alignment with the POSIX Realtime Extension.

Issue 6

The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Asynchronous Input and Output option.

The APPLICATION USAGE section is added.