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+.\"
+.\" Copyright (c) 1996 Julian Elischer
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $Id: at_exit.9,v 1.1 1996/04/13 16:59:07 joerg Exp $
+.\" "
+.Dd August 15, 1996
+.Os
+.Dt AT_EXIT 9
+.Sh NAME
+.Nm at_exit ,
+.Nm rm_at_exit
+.Nd ask that a function be run at exit.
+.Sh SYNOPSIS
+.Fd #include <sys/systm.h>
+
+.Ft typedef void \*(lp*exitlist_fn\*(rp \*(lpstruct proc *\*(rp;
+
+
+.Ft int
+.Fn at_exit "exitlist_fn func"
+.Ft int
+.Fn rm_at_exit "exitlist_fn func"
+.Sh DESCRIPTION
+The
+.Nm at_exit
+facility allows a kernel module to ensure that it is notified
+at any process exit.
+The function
+.Ar func
+is called with the a pointer to the exiting process's proc structure.
+.Pp
+If the requirement for notification is removed, then the function 
+.Nm rm_at_exit
+must be called with the exact
+.Ar func
+argument as the corresponding call to
+.Fn at_exit .
+.Pp
+.Sh RETURN VALUES
+.Nm at_exit
+returns an errno, 0 meaning success. 
+.Nm rm_at_exit
+returns the number of items removed (should be 0 or 1).
+.Sh SEE ALSO
+.Xr exit 2
+.Sh HISTORY
+The
+.Nm at_exit
+appeared in FreeBSD 2.2
+.Sh BUGS
+Since the exit queue is not sorted
+and items are added to the head, order of execution 
+is reversed to that of insertion.
+.Sh AUTHORS
+The function was written by
+.ie Julian Elischer  (julian@freebsd.org)
+.el Julian Elischer  (julian@freebsd.org)