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\" $FreeBSD: /repoman/r/ncvs/src/lib/libc/sys/aio_cancel.2,v 1.22 2003/01/13 10:37:11 tjr Exp $
\"
Dd May 17, 2010
Dt AIO_CANCEL 3
Os
Sh NAME
Nm aio_cancel
Nd cancel an outstanding asynchronous I/O operation (REALTIME)
Sh LIBRARY
Lb librt
Sh SYNOPSIS
In aio.h
Ft int
Fn aio_cancel "int fildes" "struct aiocb * aiocbp"
Sh DESCRIPTION
The
Fn aio_cancel
system call cancels the outstanding asynchronous
I/O request for the file descriptor specified in
Fa fildes .
If
Fa aiocbp
is specified, only that specific asynchronous I/O request is cancelled.
Pp
Normal asynchronous notification occurs for cancelled requests.
Requests complete with an error result of
Er ECANCELED .
Sh RETURN VALUES
The
Fn aio_cancel
system call returns \-1 to indicate an error, or one of the following:
Bl -tag -width Er
It Bq Dv AIO_CANCELED
All outstanding requests meeting the criteria specified were cancelled.
It Bq Dv AIO_NOTCANCELED
Some requests were not cancelled, status for the requests should be
checked with
Xr aio_error 3 .
It Bq Dv AIO_ALLDONE
All of the requests meeting the criteria have finished.
El
Sh ERRORS
An error return from
Fn aio_cancel
indicates:
Bl -tag -width Er
It Bq Er EBADF
The
Fa fildes
argument is an invalid file descriptor.
El
Sh SEE ALSO
Xr aio 3
Sh STANDARDS
The
Fn aio_cancel
system call is expected to conform to the
St -p1003.1-2001
standard.
Sh HISTORY
The
Fn aio_cancel
system call first appeared in
Nx 5.0 .

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