freebsd-nq/share/man/man9/at_exit.9

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.\"
.\" Copyright (c) 1996 Julian Elischer
.\"
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
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.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" $FreeBSD$
.\" "
.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/types.h>
.Fd #include <sys/systm.h>
.Ft typedef void \*(lp*exitlist_fn\*(rp \*(lpstruct proc *\*(rp;
.Pp
.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
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.Fa 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
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.Fn rm_at_exit
must be called with the exact
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.Fa func
argument as the corresponding call to
.Fn at_exit .
.Pp
.Sh RETURN VALUES
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The
.Fa at_exit
function returns an errno, 0 meaning success. The
.Fn rm_at_exit
function returns the number of items removed (should be 0 or 1).
.Sh SEE ALSO
.Xr _exit 2
.Sh HISTORY
The
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.Fn at_exit
function appeared in
.Fx 2.2 .
.Sh AUTHORS
The function was written by
.An Julian Elischer Aq julian@FreeBSD.org .