aio_return()

Get the return status for an asynchronous I/O operation

Synopsis:

#include <aio.h>

ssize_t aio_return( struct aiocb * aiocbptr );

Arguments:

aiocbptr: A pointer to an asynchronous I/O control block of type aiocb whose return status you want to get.

Library:

libc

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

The aio_return() function returns the return status associated with the aiocb structure referenced by the aiocbptr argument. The return status for an asynchronous I/O operation is the value that's returned by the corresponding read(), write(), or fsync() operation.

You can call aio_return() exactly once to retrieve the return status of a given asynchronous operation; if you use the same aiocb structure for the same operation in a call to aio_return() or aio_error(), an error may be returned.

Returns:

The value that's returned by the corresponding read(), write(), or fsync() operation.

Errors:

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

Classification:

POSIX 1003.1 AIO

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes

Caveats:

The first time you call an aio_* function, a thread pool is created, making your process multithreaded if it isn't already. The thread pool isn't destroyed until your process ends.