Name
aio_cancel — cancel an outstanding asynchronous I/O
request
Synopsis
#include <aio.h>
int
aio_cancel( |
int |
fd, |
| |
struct aiocb * |
aiocbp); |
DESCRIPTION
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 cancelled. Otherwise, only the request described
by the control block pointed to by aiocbp is cancelled.
Normal asynchronous notification occurs for cancelled
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 cancelled 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 cancelable is
implementation-defined.
RETURN VALUE
This function returns AIO_CANCELED if all requests were
successfully cancelled. It returns AIO_NOTCANCELED when at
least one of the requests specified was not cancelled 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.
ERRORS
- EBADF
-
fd is not a
valid file descriptor.
CONFORMING TO
POSIX.1-2001
SEE ALSO
aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_suspend(3), aio_write(3)
Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
This is free documentation; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The GNU General Public License's references to "object code"
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but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this manual; if not, write to the Free
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USA.
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