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-'\" t
-.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH aio_cancel 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-aio_cancel \- cancel an outstanding asynchronous I/O request
-.SH LIBRARY
-Real-time library
-.RI ( librt ", " \-lrt )
-.SH SYNOPSIS
-.nf
-.B "#include <aio.h>"
-.P
-.BI "int aio_cancel(int " fd ", struct aiocb *" aiocbp );
-.fi
-.SH DESCRIPTION
-The
-.BR aio_cancel ()
-function attempts to cancel outstanding asynchronous I/O requests
-for the file descriptor
-.IR fd .
-If
-.I aiocbp
-is NULL, all such requests are canceled.
-Otherwise, only the request
-described by the control block pointed to by
-.I aiocbp
-is canceled.
-(See
-.BR aio (7)
-for a description of the
-.I aiocb
-structure.)
-.P
-Normal asynchronous notification occurs for canceled requests (see
-.BR aio (7)
-and
-.BR sigevent (3type)).
-The request return status
-.RB ( aio_return (3))
-is set to \-1, and the request error status
-.RB ( aio_error (3))
-is set to
-.BR ECANCELED .
-The control block of requests that cannot be canceled is not changed.
-.P
-If the request could not be canceled,
-then it will terminate in the usual way after performing the I/O operation.
-(In this case,
-.BR aio_error (3)
-will return the status
-.BR EINPROGRESSS .)
-.P
-If
-.I aiocbp
-is not NULL, and
-.I fd
-differs from the file descriptor with which the asynchronous operation
-was initiated, unspecified results occur.
-.P
-Which operations are cancelable is implementation-defined.
-.\" FreeBSD: not those on raw disk devices.
-.SH RETURN VALUE
-The
-.BR aio_cancel ()
-function returns one of the following values:
-.TP
-.B AIO_CANCELED
-All requests were successfully canceled.
-.TP
-.B AIO_NOTCANCELED
-At least one of the
-requests specified was not canceled because it was in progress.
-In this case, one may check the status of individual requests using
-.BR aio_error (3).
-.TP
-.B AIO_ALLDONE
-All requests had already been completed before the call.
-.TP
-\-1
-An error occurred.
-The cause of the error can be found by inspecting
-.IR errno .
-.SH ERRORS
-.TP
-.B EBADF
-.I fd
-is not a valid file descriptor.
-.TP
-.B ENOSYS
-.BR aio_cancel ()
-is not implemented.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR aio_cancel ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-POSIX.1-2001.
-.SH EXAMPLES
-See
-.BR aio (7).
-.SH SEE ALSO
-.BR aio_error (3),
-.BR aio_fsync (3),
-.BR aio_read (3),
-.BR aio_return (3),
-.BR aio_suspend (3),
-.BR aio_write (3),
-.BR lio_listio (3),
-.BR aio (7)