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+'\" et
+.TH AIO_CANCEL "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+aio_cancel
+\(em cancel an asynchronous I/O request
+.SH SYNOPSIS
+.LP
+.nf
+#include <aio.h>
+.P
+int aio_cancel(int \fIfildes\fP, struct aiocb *\fIaiocbp\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIaio_cancel\fR()
+function shall attempt to cancel one or more asynchronous I/O requests
+currently outstanding against file descriptor
+.IR fildes .
+The
+.IR aiocbp
+argument points to the asynchronous I/O control block for a particular
+request to be canceled. If
+.IR aiocbp
+is NULL, then all outstanding cancelable asynchronous I/O requests
+against
+.IR fildes
+shall be canceled.
+.P
+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.
+.P
+For requested operations that are successfully canceled, the associated
+error status shall be set to
+.BR [ECANCELED] 
+and the return status shall be \-1. For requested operations that are
+not successfully canceled, the
+.IR aiocbp
+shall not be modified by
+\fIaio_cancel\fR().
+.P
+If
+.IR aiocbp
+is not NULL, then if
+.IR fildes
+does not have the same value as the file descriptor with which the
+asynchronous operation was initiated, unspecified results occur.
+.P
+Which operations are cancelable is implementation-defined.
+.SH "RETURN VALUE"
+The
+\fIaio_cancel\fR()
+function shall return the value AIO_CANCELED
+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\fR()
+is not indicated by the return value of
+\fIaio_cancel\fR().
+The application may determine the state of affairs for these operations
+by using
+\fIaio_error\fR().
+The value AIO_ALLDONE
+is returned if all of the operations have already completed.
+Otherwise, the function shall return \-1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIaio_cancel\fR()
+function shall fail if:
+.TP
+.BR EBADF
+The
+.IR fildes
+argument is not a valid file descriptor.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIaio_read\fR\^(\|)",
+.IR "\fIaio_write\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<aio.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .