git.saurik.com Git - apple/xnu.git/blame_incremental

... / ...

Commit	Line	Data
	1	.\" Copyright (c) 1999 Softweyr LLC.
	2	.\" All rights reserved.
	3	.\"
	4	.\" Redistribution and use in source and binary forms, with or without
	5	.\" modification, are permitted provided that the following conditions
	6	.\" are met:
	7	.\" 1. Redistributions of source code must retain the above copyright
	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
	17	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	18	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	19	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	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	.Fo aio_cancel
	39	.Fa "int fildes"
	40	.Fa "struct aiocb *aiocbp"
	41	.Fc
	42	.Sh DESCRIPTION
	43	The
	44	.Fn aio_cancel
	45	system call cancels the outstanding asynchronous
	46	I/O request for the file descriptor specified in
	47	.Fa fildes .
	48	If
	49	.Fa aiocbp
	50	is specified, only that specific asynchronous I/O request is cancelled.
	51	.Pp
	52	Normal asynchronous notification occurs for cancelled requests.
	53	Requests complete with an error result of
	54	.Er ECANCELED .
	55	.Sh RESTRICTIONS
	56	The
	57	.Fn aio_cancel
	58	system call does not cancel asynchronous I/O requests for raw disk devices.
	59	The
	60	.Fn aio_cancel
	61	system call will always return
	62	.Dv AIO_NOTCANCELED
	63	for file descriptors associated with raw disk devices.
	64	.Sh RETURN VALUES
	65	The
	66	.Fn aio_cancel
	67	system call returns -1 to indicate an error, or one of the following:
	68	.Bl -tag -width Dv
	69	.It Bq Dv AIO_ALLDONE
	70	All of the requests meeting the criteria have finished.
	71	.It Bq Dv AIO_CANCELED
	72	All outstanding requests meeting the criteria specified were cancelled.
	73	.It Bq Dv AIO_NOTCANCELED
	74	Some requests were not cancelled, status for the requests should be
	75	checked with
	76	.Xr aio_error 2 .
	77	.El
	78	.Sh ERRORS
	79	An error return from
	80	.Fn aio_cancel
	81	indicates:
	82	.Bl -tag -width Er
	83	.\" ==========
	84	.It Bq Er EBADF
	85	The
	86	.Fa fildes
	87	argument
	88	is not a valid file descriptor.
	89	.El
	90	.Sh SEE ALSO
	91	.Xr aio_error 2 ,
	92	.Xr aio_read 2 ,
	93	.Xr aio_return 2 ,
	94	.Xr aio_suspend 2 ,
	95	.Xr aio_write 2 ,
	96	.Xr aio 4
	97	.Sh STANDARDS
	98	The
	99	.Fn aio_cancel
	100	system call is expected to conform to the
	101	.St -p1003.1
	102	standard.
	103	.Sh HISTORY
	104	The
	105	.Fn aio_cancel
	106	system call first appeared in
	107	.Fx 3.0 .
	108	The first functional implementation of
	109	.Fn aio_cancel
	110	appeared in
	111	.Fx 4.0 .
	112	.Sh AUTHORS
	113	.An -nosplit
	114	This
	115	manual page was originally written by
	116	.An Wes Peters Aq wes@softweyr.com .
	117	.An Christopher M Sedore Aq cmsedore@maxwell.syr.edu
	118	updated it when
	119	.Fn aio_cancel
	120	was implemented for
	121	.Fx 4.0 .