1.\" 2.\" Copyright (c) 1996 Julian Elischer 3.\" 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.\" $FreeBSD: src/share/man/man9/at_exit.9,v 1.10.2.7 2001/12/17 11:30:18 ru Exp $ 27.\" $DragonFly: src/share/man/man9/at_exit.9,v 1.2 2003/06/17 04:37:01 dillon Exp $ 28.\" " 29.Dd August 15, 1996 30.Os 31.Dt AT_EXIT 9 32.Sh NAME 33.Nm at_exit , 34.Nm rm_at_exit 35.Nd ask that a function be run at exit 36.Sh SYNOPSIS 37.In sys/types.h 38.In sys/systm.h 39.Ft typedef\ void ( exitlist_fn ) ( struct\ proc\ * ) ; 40.Pp 41.Ft int 42.Fn at_exit "exitlist_fn func" 43.Ft int 44.Fn rm_at_exit "exitlist_fn func" 45.Sh DESCRIPTION 46The 47.Nm 48facility allows a kernel module to ensure that it is notified 49at any process exit. 50The function 51.Fa func 52is called with the a pointer to the exiting process's proc structure. 53.Pp 54If the requirement for notification is removed, then the function 55.Fn rm_at_exit 56must be called with the exact 57.Fa func 58argument as the corresponding call to 59.Fn at_exit . 60.Sh RETURN VALUES 61The 62.Fa at_exit 63function returns an errno, 0 meaning success. The 64.Fn rm_at_exit 65function returns the number of items removed (should be 0 or 1). 66.Sh SEE ALSO 67.Xr _exit 2 68.Sh HISTORY 69The 70.Fn at_exit 71function appeared in 72.Fx 2.2 . 73.Sh AUTHORS 74The function was written by 75.An Julian Elischer Aq julian@FreeBSD.org . 76