From owner-freebsd-hackers  Wed Jan  1 17:35:43 1997
Return-Path: <owner-hackers>
Received: (from root@localhost)
          by freefall.freebsd.org (8.8.4/8.8.4) id RAA07371
          for hackers-outgoing; Wed, 1 Jan 1997 17:35:43 -0800 (PST)
Received: from root.com (implode.root.com [198.145.90.17])
          by freefall.freebsd.org (8.8.4/8.8.4) with ESMTP id RAA07366
          for <hackers@freebsd.org>; Wed, 1 Jan 1997 17:35:40 -0800 (PST)
Received: from localhost (localhost [127.0.0.1]) by root.com (8.7.6/8.6.5) with SMTP id RAA13418; Wed, 1 Jan 1997 17:34:53 -0800 (PST)
Message-Id: <199701020134.RAA13418@root.com>
X-Authentication-Warning: implode.root.com: Host localhost [127.0.0.1] didn't use HELO protocol
To: Julian Assange <proff@iq.org>
cc: hackers@freebsd.org
Subject: Re: struct file locking 
In-reply-to: Your message of "Thu, 02 Jan 1997 09:24:38 +1100."
             <199701012224.JAA06593@profane.iq.org> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Wed, 01 Jan 1997 17:34:53 -0800
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>In the socket structure I intend to create a back-pointer to
>originating struct file's->u_cred. What do I need to do to insure
>these last two structures are reliably locked and in memory?

   See crhold() in sys/ucred.h and crfree() in sys/kern/kern_prot.c. They
manage the cr_ref reference count.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project