|AIO_CANCEL(2)||FreeBSD System Calls Manual||AIO_CANCEL(2)|
NAMEaio_cancel — cancel an outstanding asynchronous I/O operation (REALTIME)
LIBRARYStandard C Library (libc, -lc)
SYNOPSIS#include < aio.h>
aio_cancel( int fildes, struct aiocb *iocb);
DESCRIPTIONThe 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.
RESTRICTIONSThe 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 VALUESThe 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.
ERRORSAn error return from aio_cancel() indicates:
- [ EBADF]
- The fildes argument is an invalid file descriptor.
STANDARDSThe aio_cancel() system call is expected to conform to the IEEE Std 1003.1 (“POSIX.1”) standard.
HISTORYThe aio_cancel() system call first appeared in FreeBSD 3.0. The first functional implementation of aio_cancel() appeared in FreeBSD 4.0.
AUTHORSThis manual page was originally written by <firstname.lastname@example.org>. <email@example.com> updated it when aio_cancel() was implemented for FreeBSD 4.0.
|January 19, 2000||FreeBSD|