2 .\" Copyright (c) 1996 Julian Elischer
4 .\" All rights reserved.
6 .\" Redistribution and use in source and binary forms, with or without
7 .\" modification, are permitted provided that the following conditions
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.
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.
26 .\" $Id: at_exit.9,v 1.7 1997/04/13 14:49:02 bde Exp $
34 .Nd ask that a function be run at exit.
36 .Fd #include <sys/types.h>
37 .Fd #include <sys/systm.h>
38 .Ft typedef void \*(lp*exitlist_fn\*(rp \*(lpstruct proc *\*(rp;
41 .Fn at_exit "exitlist_fn func"
43 .Fn rm_at_exit "exitlist_fn func"
47 facility allows a kernel module to ensure that it is notified
51 is called with the a pointer to the exiting process's proc structure.
53 If the requirement for notification is removed, then the function
55 must be called with the exact
57 argument as the corresponding call to
63 function returns an errno, 0 meaning success. The
65 function returns the number of items removed (should be 0 or 1).
74 Since the exit queue is not sorted
75 and items are added to the head, order of execution
76 is reversed to that of insertion.
78 The function was written by
79 .An Julian Elischer Aq julian@FreeBSD.org .