2007-05-05 23:16:01 +04:00
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.\" $NetBSD: aio_cancel.3,v 1.2 2007/05/05 19:16:01 ad Exp $
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2007-05-05 02:37:33 +04:00
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.\"
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.\" Copyright (c) 1999 Softweyr LLC.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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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 $
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.\"
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.Dd May 4, 2007
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.Dt AIO_CANCEL 3
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.Os
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.Sh NAME
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.Nm aio_cancel
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.Nd cancel an outstanding asynchronous I/O operation (REALTIME)
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.Sh LIBRARY
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.Lb librt
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.Sh SYNOPSIS
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.In aio.h
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.Ft int
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.Fn aio_cancel "int fildes" "struct aiocb * aiocbp"
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.Sh DESCRIPTION
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The
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.Fn aio_cancel
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system call cancels the outstanding asynchronous
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I/O request for the file descriptor specified in
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.Fa fildes .
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If
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.Fa aiocbp
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is specified, only that specific asynchronous I/O request is cancelled.
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.Pp
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Normal asynchronous notification occurs for cancelled requests.
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Requests complete with an error result of
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.Er ECANCELED .
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.Sh RESTRICTIONS
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The
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.Fn aio_cancel
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system call does not cancel asynchronous I/O requests for raw disk devices.
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The
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.Fn aio_cancel
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system call will always return
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.Dv AIO_NOTCANCELED
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for file descriptors associated with raw disk devices.
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.Sh RETURN VALUES
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The
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.Fn aio_cancel
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system call returns -1 to indicate an error, or one of the following:
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.Bl -tag -width Dv
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.It Bq Dv AIO_CANCELED
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All outstanding requests meeting the criteria specified were cancelled.
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.It Bq Dv AIO_NOTCANCELED
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Some requests were not cancelled, status for the requests should be
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checked with
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.Xr aio_error 3 .
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.It Bq Dv AIO_ALLDONE
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All of the requests meeting the criteria have finished.
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.El
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.Sh ERRORS
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An error return from
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.Fn aio_cancel
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indicates:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa fildes
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argument
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is an invalid file descriptor.
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.El
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.Sh SEE ALSO
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.Xr aio_error 3 ,
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.Xr aio_read 3 ,
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.Xr aio_return 3 ,
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.Xr aio_suspend 3 ,
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.Xr aio_write 3
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.Sh STANDARDS
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The
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.Fn aio_cancel
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system call is expected to conform to the
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.St -p1003.1-2001
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standard.
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.Sh HISTORY
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The
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.Fn aio_cancel
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system call first appeared in
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.Nx 5.0 .
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