From owner-cvs-all  Sun Feb 16 17:34:52 2003
Delivered-To: cvs-all@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id E062A37B401; Sun, 16 Feb 2003 17:34:50 -0800 (PST)
Received: from sccrmhc01.attbi.com (sccrmhc01.attbi.com [204.127.202.61])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id A7DEF43F85; Sun, 16 Feb 2003 17:34:49 -0800 (PST)
	(envelope-from julian@elischer.org)
Received: from interjet.elischer.org (12-232-168-4.client.attbi.com[12.232.168.4])
          by sccrmhc01.attbi.com (sccrmhc01) with ESMTP
          id <2003021701344700100bqg35e>; Mon, 17 Feb 2003 01:34:48 +0000
Received: from localhost (localhost.elischer.org [127.0.0.1])
	by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id RAA07525;
	Sun, 16 Feb 2003 17:34:46 -0800 (PST)
Date: Sun, 16 Feb 2003 17:34:45 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: Bruce Evans <bde@zeta.org.au>
Cc: Alfred Perlstein <alfred@FreeBSD.org>,
	Max Khon <fjoe@FreeBSD.org>, src-committers@FreeBSD.org,
	cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/kern sysv_shm.c
In-Reply-To: <20030217111423.R3751-100000@gamplex.bde.org>
Message-ID: <Pine.BSF.4.21.0302161726140.99373-100000@InterJet.elischer.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-cvs-all@FreeBSD.ORG
Precedence: bulk
List-ID: <cvs-all.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20cvs-all>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20cvs-all>
X-Loop: FreeBSD.ORG



On Mon, 17 Feb 2003, Bruce Evans wrote:
> 
> Overflow checking of shminfo.shmmax isn't very useful.  Most tunables
> have no sanity checking, and none have complete sanity checking.  For
> shminfo.shmmax, users can get the same effect as overflow by setting
> kern.ipc.shmmaxpages to a too-small value.  E.g., 0 gives the same
> result as 2^32/PAGE_SIZE after overflow, and overflow is benign on all
> supported machines so the effect is also the same.
> 


I've often thought at it would be good to be able to specify a sysctl or
tunable (loader tunable) in a way that some simple min and max
values are checked..

Ther are a lot of cases for sysctls where there needs to be a special
handler because we need to check that the input is between 1<input<N
where a standard handler could be used if one could specify to it that
the input should be bounded by 1 and N.




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