aio_error()

Arguments:

aiocbptr

A pointer to an asynchronous I/O control block of type aiocb that you want the error status for.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The aio_error() function returns the error status associated with the aiocb structure referenced by the aiocbptr argument. The error status for an asynchronous I/O operation is the errno value that's set by the corresponding read(), write(), or fsync() operation. If the operation hasn't yet been completed, the error status is EINPROGRESS.

Returns:

One of:

• 0 if the operation was completed successfully
• the error status set by read(), write(), or fsync() if the operation wasn't completed successfully
• EINPROGRESS if the operation hasn't yet been completed

Errors:

EINVAL

The aiocbptr argument doesn't refer to an asynchronous operation whose return status hasn't yet been retrieved.

Classification:

POSIX 1003.1

Caveats:

The first time you call an aio_* function, a thread pool is created, making your process multithreaded if it isn't already. Because of this, after a fork() the child can not use any of the aio_*() functions if the parent used any aio_*() functions before the fork(). The thread pool isn't destroyed until your process ends.