2004-11-03 13:51:07 +00:00
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.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, write to the Free
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.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
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.\" USA.
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.\"
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.TH AIO_CANCEL 3 2003-11-14 "" "Linux Programmer's Manual"
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.SH NAME
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aio_cancel \- cancel an outstanding asynchronous I/O request
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.SH SYNOPSIS
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.sp
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.B "#include <aio.h>"
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.sp
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.BI "int aio_cancel(int " fd ", struct aiocb *" aiocbp );
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.SH DESCRIPTION
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The
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2005-10-19 06:54:38 +00:00
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.BR aio_cancel ()
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2004-11-03 13:51:07 +00:00
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function attempts to cancel outstanding asynchronous I/O requests
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for the file descriptor
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.IR fd .
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If
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.I aiocbp
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is NULL, all such requests are cancelled. Otherwise, only the request
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described by the control block pointed to by
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.I aiocbp
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is cancelled.
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.LP
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Normal asynchronous notification occurs for cancelled requests.
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The request return status is set to \-1, and the request error status
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is set to ECANCELED.
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The control block of requests that cannot be cancelled is not changed.
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.LP
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If
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.I aiocbp
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is not NULL, and
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.I fd
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differs from the file descriptor with which the asynchronous operation
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was initiated, unspecified results occur.
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.LP
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Which operations are cancelable is implementation-defined.
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.\" FreeBSD: not those on raw disk devices.
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.SH "RETURN VALUE"
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This function returns AIO_CANCELED if all requests were successfully
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cancelled. It returns AIO_NOTCANCELED when at least one of the
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requests specified was not cancelled because it was in progress.
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In this case one may check the status of individual requests using
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.BR aio_error (3).
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This function returns AIO_ALLDONE when all requests had
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been completed already before this call.
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When some error occurs, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EBADF
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.I fd
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is not a valid file descriptor.
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.SH "CONFORMING TO"
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2006-08-03 13:57:30 +00:00
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POSIX.1-2001
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2004-11-03 13:51:07 +00:00
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.SH "SEE ALSO"
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.BR aio_error (3),
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.BR aio_fsync (3),
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.BR aio_read (3),
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.BR aio_return (3),
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.BR aio_suspend (3),
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.BR aio_write (3)
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