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+.\" Copyright (c) 1999 Softweyr LLC.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 2, 1999
+.Dt AIO_CANCEL 2
+.Os
+.Sh NAME
+.Nm aio_cancel
+.Nd cancel an outstanding asynchronous I/O operation (REALTIME)
+.Sh SYNOPSIS
+.Fd #include <aio.h>
+.Ft int
+.Fn aio_cancel "int something" "struct aiocb * iocb"
+.Sh DESCRIPTION
+The
+.Fn aio_cancel
+function is supposed to cancel the specified outstanding asynchronous
+I/O request.
+.Fn aio_cancel
+is not implemented at this time, and always fails returning
+.Dv ENOSYS .
+.Sh RETURN VALUES
+When
+.Fn aio_cancel
+inevitably fails, it returns
+.Dv ENOSYS
+to signify it is not supported.
+.Sh SEE ALSO
+.Xr aio_error 2 ,
+.Xr aio_read 2 ,
+.Xr aio_return 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_write 2 .
+.Sh ERRORS
+The
+.Fn aio_cancel
+function currently always fails, due to:
+.Bl -tag -width Er
+.It Bq Er ENOSYS
+this operation is not implemented at this time.
+.El
+.Sh STANDARDS
+.Nm
+fails to conform to the
+.St -p1003.2
+standard.
+.Sh HISTORY
+The
+.Nm
+function first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Wes Peters Aq wes@softweyr.com .