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IO_CANCEL
Section: Linux Programmer's Manual (2)
Updated: 2008-06-18
Index
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NAME
io_cancel - cancel an outstanding asynchronous I/O operation
SYNOPSIS
#include <libaio.h>
int io_cancel(aio_context_t ctx_id, struct iocb *iocb,
struct io_event *result);
Link with -laio.
DESCRIPTION
io_cancel()
attempts to cancel an asynchronous I/O operation previously submitted with
io_submit(2).
ctx_id 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.
RETURN VALUE
On success,
io_cancel()
returns 0.
For the failure return, see NOTES.
ERRORS
- EAGAIN
-
The iocb specified was not canceled.
- EFAULT
-
One of the data structures points to invalid data.
- EINVAL
-
The AIO context specified by ctx_id is invalid.
- ENOSYS
-
io_cancel()
is not implemented on this architecture.
VERSIONS
The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
CONFORMING TO
io_cancel()
is Linux-specific and should not be used
in programs that are intended to be portable.
NOTES
Glibc does not provide a wrapper function for this system call.
The wrapper provided in
libaio
for
io_cancel()
does not follow the usual C library conventions for indicating error:
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.
SEE ALSO
io_destroy(2),
io_getevents(2),
io_setup(2),
io_submit(2)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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