AIO_CANCEL(P) POSIX Programmer's Manual AIO_CANCEL(P)
aio_cancel - cancel an asynchronous I/O request (REALTIME)
int aio_cancel(int fildes, struct aiocb *aiocbp);
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 can-
Normal asynchronous notification shall occur for asynchronous I/O operations that are suc-
cessfully canceled. If there are requests that cannot be canceled, then the normal asyn-
chronous 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 to the calling process 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:
EBADF 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>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 AIO_CANCEL(P)