NAME
aio_cancel —
cancel an outstanding
asynchronous I/O operation (REALTIME)
LIBRARY
POSIX Real-time Library (librt, -lrt)
SYNOPSIS
#include <aio.h>
int
aio_cancel(
int
fildes,
struct aiocb *
aiocbp);
DESCRIPTION
The
aio_cancel() system call cancels the outstanding
asynchronous I/O request for the file descriptor specified in
fildes. If
aiocbp is specified,
only that specific asynchronous I/O request is cancelled.
Normal asynchronous notification occurs for cancelled requests. Requests
complete with an error result of
ECANCELED
.
RETURN VALUES
The
aio_cancel() system call returns -1 to indicate an error,
or one of the following:
-
-
- [
AIO_CANCELED
]
- All outstanding requests meeting the criteria specified
were cancelled.
-
-
- [
AIO_NOTCANCELED
]
- Some requests were not cancelled, status for the requests
should be checked with
aio_error(3).
-
-
- [
AIO_ALLDONE
]
- All of the requests meeting the criteria have
finished.
ERRORS
An error return from
aio_cancel() indicates:
-
-
- [
EBADF
]
- The fildes argument is an invalid
file descriptor.
SEE ALSO
aio(3)
STANDARDS
The
aio_cancel() system call is expected to conform to the
IEEE Std 1003.1-2001 (“POSIX.1”) standard.
HISTORY
The
aio_cancel() system call first appeared in
NetBSD 5.0.