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.\" 28.Dd August 15, 1996 29.Dt AT_EXIT 9 30.Os 31.Sh NAME 32.Nm at_exit , 33.Nm rm_at_exit 34.Nd ask that a function be run at exit 35.Sh SYNOPSIS 36.In sys/types.h 37.In sys/systm.h 38.Ft typedef\ void ( exitlist_fn ) ( struct\ proc\ * ) ; 39.Pp 40.Ft int 41.Fn at_exit "exitlist_fn func" 42.Ft int 43.Fn rm_at_exit "exitlist_fn func" 44.Sh DESCRIPTION 45The 46.Nm 47facility allows a kernel module to ensure that it is notified 48at any process exit. 49The function 50.Fa func 51is called with the a pointer to the exiting process's proc structure. 52.Pp 53If the requirement for notification is removed, then the function 54.Fn rm_at_exit 55must be called with the exact 56.Fa func 57argument as the corresponding call to 58.Fn at_exit . 59.Sh RETURN VALUES 60The 61.Fn at_exit 62function returns an 63.Va errno , 640 meaning success. 65The 66.Fn rm_at_exit 67function returns the number of items removed (should be 0 or 1). 68.Sh SEE ALSO 69.Xr _exit 2 70.Sh HISTORY 71The 72.Fn at_exit 73function appeared in 74.Fx 2.2 . 75.Sh AUTHORS 76The function was written by 77.An Julian Elischer Aq julian@FreeBSD.org . 78