From owner-freebsd-current  Tue Nov  3 06:16:12 1998
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id GAA13026
          for freebsd-current-outgoing; Tue, 3 Nov 1998 06:16:12 -0800 (PST)
          (envelope-from owner-freebsd-current@FreeBSD.ORG)
Received: from zone.syracuse.net (zone.syracuse.net [205.232.47.17])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id GAA13021
          for <current@FreeBSD.ORG>; Tue, 3 Nov 1998 06:16:10 -0800 (PST)
          (envelope-from green@zone.syracuse.net)
Received: from localhost (green@localhost)
	by zone.syracuse.net (8.8.8/8.8.7) with ESMTP id JAA27776;
	Tue, 3 Nov 1998 09:15:55 -0500 (EST)
Date: Tue, 3 Nov 1998 09:15:55 -0500 (EST)
From: Brian Feldman <green@zone.syracuse.net>
To: Luoqi Chen <luoqi@watermarkgroup.com>
cc: dot@dotat.at, current@FreeBSD.ORG
Subject: Re: Linux clone()
In-Reply-To: <199811030332.WAA24322@lor.watermarkgroup.com>
Message-ID: <Pine.BSF.4.05.9811030911450.27548-100000@zone.syracuse.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Hmm.. AH! Now we're getting somewhere! I was planning to add that flag
mapping before I had a final version of the patch, and still am. Okay,
wonderful, I only get a stack pointer... I shouldn't fiddle with p2's eip
then, or should I set it to a copyin of the long function pointer from the
end of the stack... sorry, I never knew assembly :(

Brian Feldman

On Mon, 2 Nov 1998, Luoqi Chen wrote:

> > Hmmm.. okay this would be a good test. Right now I'm going thru the
> > various linuxthreads example programs.... The patch seems to be doing
> > something wrong, and I'm unable to figure out what to do, due to Linux's
> > humongously gross syscall system (so the kernel doesn't help me). It also
> > seems now I was implementing a LIBRARY function, which is just a wrapper.
> > If I could get my hands on what the real system calls' args are it would
> > be great.
> > 
> > Brian Feldman
> > 
> It seems that clone() the syscall takes two arguments:
> 	struct linux_clone_args {
> 		int	flags;
> 		void	*stack;
> 	};
> the wrapper in library takes care of pushing the function address and its
> argument on to the stack. You probably also want to map linux clone flags
> to that of rfork's: CLONE_FILES -> RFFDG, CLONE_VM -> RFMEM.
> 
> -lq
> 


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