aio_cancel2
Cancel an outstanding asynchronous i/o operation (realtime)
Usage
#include <aio.h>
int
aio_cancel(int fildes, struct aiocb *iocb);
Library
Standard C Library (libc, -lc)
Overview
The aio_cancel() system call cancels the outstanding asynchronous I/O request for the file descriptor specified in fildes. If iocb 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.
Restrictions
The aio_cancel() system call does not cancel asynchronous I/O requests for raw disk devices. The aio_cancel() system call will always return AIO_NOTCANCELED for file descriptors associated with raw disk devices.
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(2).
- [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.
Releases
74 releases since FreeBSD 3.3-RELEASE; the text changed 40 times.