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.\" Copyright (C) 2003 Free Software Foundation, Inc.
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.\" This file is distributed according to the GNU General Public License.
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.\" See the file COPYING in the top level source directory for details.
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.\"
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.\" .IP "\\$1" \\$2
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.\" ..
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2004-11-03 13:51:07 +00:00
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.TH "IO_CANCEL" 2 "2003-02-21" "Linux 2.4" "Linux Programmer's Manual"
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.SH NAME
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io_cancel \- cancel an outstanding asynchronous I/O operation
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.SH "SYNOPSIS"
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.nf
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.\" .ad l
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.\" .hy 0
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.\"
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.B #include <libaio.h>
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.\"#include <linux/aio.h>
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.sp
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.\" .HP 16
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.BI "int io_cancel(aio_context_t " ctx_id ", struct iocb *" iocb ,
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.BI " struct io_event *" result );
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.\" .ad
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.\" .hy
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.fi
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.SH "DESCRIPTION"
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.PP
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\fBio_cancel\fR() attempts to cancel an asynchronous I/O operation
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previously submitted with the \fBio_submit\fR system call.
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\fIctx_id\fR is the AIO context ID of the operation to be cancelled.
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If the AIO context is found, the event will be cancelled and then copied
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into the memory pointed to by \fIresult\fR without being placed
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into the completion queue.
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.SH "RETURN VALUE"
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.PP
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\fBio_cancel\fR() returns 0 on success;
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on failure, it returns one of the errors listed under ERRORS.
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.SH "ERRORS"
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.TP
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.B EINVAL
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The AIO context specified by \fIctx_id\fR is invalid.
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.TP
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.B EFAULT
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One of the data structures points to invalid data.
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.TP
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.B EAGAIN
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The \fIiocb\fR specified was not cancelled.
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.TP
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.B ENOSYS
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\fBio_cancel\fR() is not implemented on this architecture.
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.SH "VERSIONS"
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.PP
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The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
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.SH "CONFORMING TO"
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.PP
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\fBio_cancel\fR() is Linux specific and should not be used
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in programs that are intended to be portable.
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.SH "SEE ALSO"
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.PP
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\fBio_setup\fR(2), \fBio_destroy\fR(2), \fBio_getevents\fR(2),
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\fBio_submit\fR(2).
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.\" .SH "NOTES"
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.\"
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.\" .PP
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.\" The asynchronous I/O system calls were written by Benjamin LaHaise.
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.\"
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.\" .SH AUTHOR
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.\" Kent Yoder.
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