The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.
A newer edition of this document exists here


aio_cancel - cancel an asynchronous I/O request (REALTIME)


[AIO] [Option Start] #include <aio.h>

int aio_cancel(int
fildes, struct aiocb *aiocbp); [Option End]


The aio_cancel() function shall attempt to cancel one or more asynchronous I/O requests currently outstanding against file descriptor fildes. The aiocbp argument points to the asynchronous I/O control block for a particular request to be canceled. If aiocbp is NULL, then all outstanding cancelable asynchronous I/O requests against fildes shall be canceled.

Normal asynchronous notification shall occur for asynchronous I/O operations that are successfully canceled. If there are requests that cannot be canceled, then the normal asynchronous completion process shall take place for those requests when they are completed.

For requested operations that are successfully canceled, the associated error status shall be set to [ECANCELED] and the return status shall be -1. For requested operations that are not successfully canceled, the aiocbp shall not be modified by aio_cancel().

If aiocbp is not NULL, then if fildes does not have the same value as the file descriptor with which the asynchronous operation was initiated, unspecified results occur.

Which operations are cancelable is implementation-defined.


The aio_cancel() function shall return the value AIO_CANCELED if the requested operation(s) were canceled. The value AIO_NOTCANCELED shall be returned if at least one of the requested operation(s) cannot be canceled because it is in progress. In this case, the state of the other operations, if any, referenced in the call to aio_cancel() is not indicated by the return value of aio_cancel(). The application may determine the state of affairs for these operations by using aio_error(). The value AIO_ALLDONE is returned if all of the operations have already completed. Otherwise, the function shall return -1 and set errno to indicate the error.


The aio_cancel() function shall fail if:

The fildes argument is not a valid file descriptor.

The following sections are informative.




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






aio_read(), aio_write(), the Base Definitions volume of IEEE Std 1003.1-2001, <aio.h>


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.

IEEE Std 1003.1-2001/Cor 2-2004, item XSH/TC2/D6/10 is applied, removing the words ``to the calling process'' in the RETURN VALUE section. The term was unnecessary and precluded threads.

End of informative text.

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