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	1	.\" Copyright (c) 1999 Softweyr LLC.
	2	.\" All rights reserved.
	3	.\"
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	5	.\" modification, are permitted provided that the following conditions
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	8	.\" notice, this list of conditions and the following disclaimer.
	9	.\" 2. Redistributions in binary form must reproduce the above copyright
	10	.\" notice, this list of conditions and the following disclaimer in the
	11	.\" documentation and/or other materials provided with the distribution.
	12	.\"
	13	.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
	14	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	16	.\" ARE DISCLAIMED. IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
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	18	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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	20	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	21	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	22	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	23	.\" SUCH DAMAGE.
	24	.\"
	25	.\" $FreeBSD: src/lib/libc/sys/aio_cancel.2,v 1.22 2003/01/13 10:37:11 tjr Exp $
	26	.\"
	27	.Dd January 19, 2000
	28	.Dt AIO_CANCEL 2
	29	.Os
	30	.Sh NAME
	31	.Nm aio_cancel
	32	.Nd cancel an outstanding asynchronous I/O operation (REALTIME)
	33	.Sh LIBRARY
	34	.Lb libc
	35	.Sh SYNOPSIS
	36	.In aio.h
	37	.Ft int
	38	.Fn aio_cancel "int fildes" "struct aiocb * iocb"
	39	.Sh DESCRIPTION
	40	The
	41	.Fn aio_cancel
	42	system call cancels the outstanding asynchronous
	43	I/O request for the file descriptor specified in
	44	.Fa fildes .
	45	If
	46	.Fa iocb
	47	is specified, only that specific asynchronous I/O request is cancelled.
	48	.Pp
	49	Normal asynchronous notification occurs for cancelled requests.
	50	Requests complete with an error result of
	51	.Er ECANCELED .
	52	.Sh RESTRICTIONS
	53	The
	54	.Fn aio_cancel
	55	system call does not cancel asynchronous I/O requests for raw disk devices.
	56	The
	57	.Fn aio_cancel
	58	system call will always return
	59	.Dv AIO_NOTCANCELED
	60	for file descriptors associated with raw disk devices.
	61	.Sh RETURN VALUES
	62	The
	63	.Fn aio_cancel
	64	system call returns -1 to indicate an error, or one of the following:
	65	.Bl -tag -width Dv
	66	.It Bq Dv AIO_CANCELED
	67	All outstanding requests meeting the criteria specified were cancelled.
	68	.It Bq Dv AIO_NOTCANCELED
	69	Some requests were not cancelled, status for the requests should be
	70	checked with
	71	.Xr aio_error 2 .
	72	.It Bq Dv AIO_ALLDONE
	73	All of the requests meeting the criteria have finished.
	74	.El
	75	.Sh ERRORS
	76	An error return from
	77	.Fn aio_cancel
	78	indicates:
	79	.Bl -tag -width Er
	80	.It Bq Er EBADF
	81	The
	82	.Fa fildes
	83	argument
	84	is an invalid file descriptor.
	85	.El
	86	.Sh SEE ALSO
	87	.Xr aio_error 2 ,
	88	.Xr aio_read 2 ,
	89	.Xr aio_return 2 ,
	90	.Xr aio_suspend 2 ,
	91	.Xr aio_write 2 ,
	92	.Xr aio 4
	93	.Sh STANDARDS
	94	The
	95	.Fn aio_cancel
	96	system call is expected to conform to the
	97	.St -p1003.1
	98	standard.
	99	.Sh HISTORY
	100	The
	101	.Fn aio_cancel
	102	system call first appeared in
	103	.Fx 3.0 .
	104	The first functional implementation of
	105	.Fn aio_cancel
	106	appeared in
	107	.Fx 4.0 .
	108	.Sh AUTHORS
	109	.An -nosplit
	110	This
	111	manual page was originally written by
	112	.An Wes Peters Aq wes@softweyr.com .
	113	.An Christopher M Sedore Aq cmsedore@maxwell.syr.edu
	114	updated it when
	115	.Fn aio_cancel
	116	was implemented for
	117	.Fx 4.0 .