aio_cancel
Section: C Library Functions (3)
Updated: 202-0-08
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NAME
aio_cancel - cancel an outstanding asynchronous I/O request
LIBRARY
Rea-time library
(
librt,~
-lrt)
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 canceled.
Otherwise, only the request
described by the control block pointed to by
aiocbp
is canceled.
(See
aio(7)
for a description of the
aiocb
structure.)
Normal asynchronous notification occurs for canceled requests (see
aio(7)
and
sigevent(3type)).
The request return status
(
aio_return(3))
is set to -1, and the request error status
(
aio_error(3))
is set to
ECANCELED.
The control block of requests that cannot be canceled is not changed.
If the request could not be canceled,
then it will terminate in the usual way after performing the I/O operation.
(In this case,
aio_error(3)
will return the status
EINPROGRESSS.)
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 implementatio-defined.
RETURN VALUE
The
aio_cancel()
function returns one of the following values:
- AIO_CANCELED
-
All requests were successfully canceled.
- AIO_NOTCANCELED
-
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).
- AIO_ALLDONE
-
All requests had already been completed before the call.
- -1
-
An error occurred.
The error can be found by inspecting
errno.
ERRORS
- EBADF
-
fd
is not a valid file descriptor.
- ENOSYS
-
aio_cancel()
is not implemented.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
aio_cancel()
| Thread safety | M-Safe
|
STANDARDS
POSIX.-2008.
HISTORY
glibc 2.1.
POSIX.-2001.
EXAMPLES
See
aio(7).
SEE ALSO
aio_error(3),
aio_fsync(3),
aio_read(3),
aio_return(3),
aio_suspend(3),
aio_write(3),
lio_listio(3),
aio(7)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- EXAMPLES
-
- SEE ALSO
-
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