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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "AIO_CANCEL" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" aio_cancel 
+.SH NAME
+aio_cancel \- cancel an asynchronous I/O request (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <aio.h>
+.br
+.sp
+int aio_cancel(int\fP \fIfildes\fP\fB, struct aiocb *\fP\fIaiocbp\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIaio_cancel\fP() function shall attempt to cancel one or more
+asynchronous I/O requests currently outstanding against
+file descriptor \fIfildes\fP. The \fIaiocbp\fP argument points to
+the asynchronous I/O control block for a particular request to
+be canceled. If \fIaiocbp\fP is NULL, then all outstanding cancelable
+asynchronous I/O requests against \fIfildes\fP shall be
+canceled.
+.LP
+Normal asynchronous notification shall occur for asynchronous I/O
+operations that are successfully canceled. If there are
+requests that cannot be canceled, then the normal asynchronous completion
+process shall take place for those requests when they are
+completed.
+.LP
+For requested operations that are successfully canceled, the associated
+error status shall be set to [ECANCELED] and the return
+status shall be -1. For requested operations that are not successfully
+canceled, the \fIaiocbp\fP shall not be modified by
+\fIaio_cancel\fP().
+.LP
+If \fIaiocbp\fP is not NULL, then if \fIfildes\fP does not have the
+same value as the file descriptor with which the
+asynchronous operation was initiated, unspecified results occur.
+.LP
+Which operations are cancelable is implementation-defined.
+.SH RETURN VALUE
+.LP
+The \fIaio_cancel\fP() function shall return the value AIO_CANCELED
+to the calling process if the requested operation(s) were
+canceled. The value AIO_NOTCANCELED shall be returned if at least
+one of the requested operation(s) cannot be canceled because it
+is in progress. In this case, the state of the other operations, if
+any, referenced in the call to \fIaio_cancel\fP() is not
+indicated by the return value of \fIaio_cancel\fP(). The application
+may determine the state of affairs for these operations by
+using \fIaio_error\fP(). The value AIO_ALLDONE is returned if all
+of the operations have
+already completed. Otherwise, the function shall return -1 and set
+\fIerrno\fP to indicate the error.
+.SH ERRORS
+.LP
+The \fIaio_cancel\fP() function shall fail if:
+.TP 7
+.B EBADF
+The \fIfildes\fP argument is not a valid file descriptor.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIaio_cancel\fP() function is part of the Asynchronous Input
+and Output option and need not be available on all
+implementations.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIaio_read\fP() , \fIaio_write\fP() , the Base Definitions volume
+of
+IEEE\ Std\ 1003.1-2001, \fI<aio.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .