The
aio_cancel()
function attempts to cancel outstanding asynchronous I/O requests
for the file descriptor
fd.
If
aiocbp
is NULL, all such requests are canceled.
Otherwise, only the request
described by the control block pointed to by
aiocbp
is canceled.
Normal asynchronous notification occurs for canceled requests.
The request return status is set to -1, and the request error status
is set to
ECANCELED.
The control block of requests that cannot be canceled is not changed.
If
aiocbp
is not NULL, and
fd
differs from the file descriptor with which the asynchronous operation
was initiated, unspecified results occur.
Which operations are cancellable is implementation-defined.
RETURN VALUE
This function returns
AIO_CANCELED
if all requests were successfully
canceled.
It returns
AIO_NOTCANCELED
when at least one of the
requests specified was not canceled because it was in progress.
In this case one may check the status of individual requests using
aio_error(3).
This function returns
AIO_ALLDONE
when all requests had
been completed already before this call.
When some error occurs, -1 is returned, and
errno
is set appropriately.
This page is part of release 3.14 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
