79 lines
2.4 KiB
Groff
79 lines
2.4 KiB
Groff
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\" "
|
|
.Dd August 15, 1996
|
|
.Os
|
|
.Dt AT_FORK 9
|
|
.Sh NAME
|
|
.Nm at_fork ,
|
|
.Nm rm_at_fork
|
|
.Nd ask that a function be run at fork
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In sys/systm.h
|
|
.Ft "typedef void" ( *forklist_fn )
|
|
.Fa ( "struct proc*" , "struct proc*" , int ) ;
|
|
.Pp
|
|
.Ft int
|
|
.Fn at_fork "forklist_fn func"
|
|
.Ft int
|
|
.Fn rm_at_fork "forklist_fn func"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
facility allows a kernel module to ensure that it is notified
|
|
at any process fork.
|
|
The function
|
|
.Fa func
|
|
is called with the a pointer to the forking process's proc structure,
|
|
a pointer to the child's process structure and a flag word,
|
|
as used in
|
|
.Xr rfork 2
|
|
to indicate the type of fork.
|
|
.Pp
|
|
If the requirement for notification is removed, then the function
|
|
.Fn rm_at_fork
|
|
must be called with the exact
|
|
.Fa func
|
|
argument as the corresponding call to
|
|
.Fn at_fork .
|
|
.Sh RETURN VALUES
|
|
.Fn at_fork
|
|
returns an errno, 0 meaning success.
|
|
.Fn rm_at_fork
|
|
returns the number of items removed (should be 0 or 1).
|
|
.Sh SEE ALSO
|
|
.Xr fork 2
|
|
.Sh HISTORY
|
|
The
|
|
.Fn at_fork
|
|
function appeared in
|
|
.Fx 2.2 .
|
|
.Sh AUTHORS
|
|
The function was written by
|
|
.An Julian Elischer Aq julian@FreeBSD.org .
|