aio_cancel — cancel an outstanding asynchronous I/O operation (REALTIME)
Standard C Library (libc, −lc)
aio_cancel(int fildes, struct aiocb *iocb);
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.
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.
The aio_cancel() system call returns -1 to indicate an error, or one of the following:
All outstanding requests meeting the criteria specified were cancelled.
Some requests were not cancelled, status for the requests should be checked with aio_error(2).
All of the requests meeting the criteria have finished.
An error return from aio_cancel() indicates:
The fildes argument is an invalid file descriptor.
The aio_cancel() system call is expected to conform to the IEEE Std 1003.1 (’’POSIX.1’’) standard.
The aio_cancel() system call first appeared in FreeBSD 3.0. The first functional implementation of aio_cancel() appeared in FreeBSD 4.0.
BSD January 19, 2000 BSD