From owner-freebsd-current@FreeBSD.ORG  Fri Apr  6 18:43:18 2007
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: freebsd-current@FreeBSD.org
Delivered-To: freebsd-current@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 6A4DB16A402;
	Fri,  6 Apr 2007 18:43:18 +0000 (UTC)
	(envelope-from jkim@FreeBSD.org)
Received: from anuket.mj.niksun.com (gwnew.niksun.com [65.115.46.162])
	by mx1.freebsd.org (Postfix) with ESMTP id 2A44913C4C6;
	Fri,  6 Apr 2007 18:43:17 +0000 (UTC)
	(envelope-from jkim@FreeBSD.org)
Received: from niksun.com (anuket [10.70.0.5])
	by anuket.mj.niksun.com (8.13.6/8.13.6) with ESMTP id l36IhHVO018761;
	Fri, 6 Apr 2007 14:43:17 -0400 (EDT) (envelope-from jkim@FreeBSD.org)
From: Jung-uk Kim <jkim@FreeBSD.org>
To: freebsd-current@FreeBSD.org
Date: Fri, 6 Apr 2007 14:43:13 -0400
User-Agent: KMail/1.6.2
References: <20070407023855.ede13b76.nork@FreeBSD.org>
	<200704061407.35340.jkim@FreeBSD.org>
	<20070406181138.GA90738@freebsd.org>
In-Reply-To: <20070406181138.GA90738@freebsd.org>
MIME-Version: 1.0
Content-Disposition: inline
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Message-Id: <200704061443.15071.jkim@FreeBSD.org>
X-Virus-Scanned: ClamAV 0.88.6/3029/Fri Apr 6 12:53:11 2007 on
	anuket.mj.niksun.com
X-Virus-Status: Clean
Cc: Roman Divacky <rdivacky@FreeBSD.org>,
	Norikatsu Shigemura <nork@FreeBSD.org>
Subject: Re: Cannot mount linprocfs by unresolving sysvs?m symbols
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 06 Apr 2007 18:43:18 -0000

On Friday 06 April 2007 02:11 pm, Roman Divacky wrote:
> > > is there a way to do this nicely?
> >
> > Probably we can improve kernel linker to do better job. ;-)  I
> > mean, load all dependencies before look up symbols.
>
> thats not what I mean.. what I want is something like
>
> if (function_present(foo))
>    x = foo();
> else
>    x = SAFE_VALUE;
>
> use x somehow;
>
> so we don't have to have all modules loaded etc. the same could be
> done for some syscalls, imagine
>
> linux_foo(params)
> {
>    if (function_present(foo))
>       return foo(params);
>   else
>       return ENOSYS;
> }
>
> I like this better then loading all possible modules.

I know what you meant but it is more heavier than what we have now.  
If you insist, you can do something like linux_ipc.c.  Check out 
linux_msgctl() and linux_semctl().  Module presence check is easy.

Jung-uk Kim