io_cancel — cancel an outstanding asynchronous I/O operation
#include <linux/aio_abi.h> /* Defines needed types */
int
io_cancel( |
aio_context_t ctx_id, |
struct iocb *iocb, | |
struct io_event *result) ; |
![]() |
Note |
---|---|
There is no glibc wrapper for this system call; see NOTES. |
The io_cancel
() system call
attempts to cancel an asynchronous I/O operation previously
submitted with io_submit(2). The
ctx_id
argument is
the AIO context ID of the operation to be canceled. If the
AIO context is found, the event will be canceled and then
copied into the memory pointed to by result
without being placed
into the completion queue.
The iocb
specified was not canceled.
One of the data structures points to invalid data.
The AIO context specified by ctx_id
is invalid.
io_cancel
() is not
implemented on this architecture.
io_cancel
() is
Linux-specific and should not be used in programs that are
intended to be portable.
Glibc does not provide a wrapper function for this system
call. You could invoke it using syscall(2). But instead,
you probably want to use the io_cancel
() wrapper function provided by
libaio
.
Note that the libaio
wrapper function uses
a different type (io_context_t) for
the ctx_id
argument.
Note also that the libaio
wrapper does not
follow the usual C library conventions for indicating errors:
on error it returns a negated error number (the negative of
one of the values listed in ERRORS). If the system call is
invoked via syscall(2), then the return
value follows the usual conventions for indicating an error:
−1, with errno
set to a
(positive) value that indicates the error.
This page is part of release 3.42 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/.
Copyright (C) 2003 Free Software Foundation, Inc. This file is distributed according to the GNU General Public License. See the file COPYING in the top level source directory for details. |