From owner-freebsd-hackers  Sat Oct 16 22:23:26 1999
Delivered-To: freebsd-hackers@freebsd.org
Received: from celery.dragondata.com (celery.dragondata.com [205.253.12.6])
	by hub.freebsd.org (Postfix) with ESMTP id 32B1114FBA
	for <freebsd-hackers@FreeBSD.ORG>; Sat, 16 Oct 1999 22:23:18 -0700 (PDT)
	(envelope-from toasty@celery.dragondata.com)
Received: (from root@localhost)
	by celery.dragondata.com (8.9.3/8.9.3) id AAA26797;
	Sun, 17 Oct 1999 00:24:15 -0500 (CDT)
	(envelope-from toasty)
From: Kevin Day <toasty@dragondata.com>
Message-Id: <199910170524.AAA26797@celery.dragondata.com>
Subject: Re: Handling segV's
To: wes@softweyr.com (Wes Peters)
Date: Sun, 17 Oct 1999 00:24:15 -0500 (CDT)
Cc: toasty@dragondata.com (Kevin Day),
	newton@internode.com.au (Mark Newton), gupz@hotmail.com (Dodge Ram),
	freebsd-hackers@FreeBSD.ORG
In-Reply-To: <38095168.FE3F1535@softweyr.com> from "Wes Peters" at Oct 16, 1999 10:32:40 PM
X-Mailer: ELM [version 2.5 PL1]
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

> 
> Kevin Day wrote:
> > 
> > I mmap() files in, then copy them to a device. This works great except when
> > someone tries to change that file during the copy. If the size of the file
> > shrinks, I'll SIGBUS or SIGSEGV when i try to touch past the new file size.
> > So, i setup a signal handler and longjmp into some recovery code.
> > 
> > Perhaps there's a better way, but I don't consider this a bug really, and
> > i'll get a SEGV. :)
> 
> MAP_PRIVATE?
> 

This has the undesired effect of me not noticing that the file changed then. 

Kevin


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message