From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1DXqZA-0006L2-He for user-mode-linux-devel@lists.sourceforge.net; Mon, 16 May 2005 18:08:12 -0700 Received: from externalmx-1.sourceforge.net ([12.152.184.25]) by sc8-sf-mx2.sourceforge.net with esmtp (TLSv1:AES256-SHA:256) (Exim 4.41) id 1DXn1e-00031P-RP for user-mode-linux-devel@lists.sourceforge.net; Mon, 16 May 2005 14:28:15 -0700 Received: from lakshmi.addtoit.com ([198.99.130.6] helo=lakshmi.solana.com) by externalmx-1.sourceforge.net with esmtp (Exim 4.41) id 1DXn1Z-0006zr-SM for user-mode-linux-devel@lists.sourceforge.net; Mon, 16 May 2005 14:21:20 -0700 From: Jeff Dike Subject: Re: [uml-devel] Explaination of system call function flow in TT mode Message-ID: <20050516205233.GA9668@ccure.user-mode-linux.org> References: <003e01c503b3$f3e46cb0$ac655e0a@sha.st.com> <200501282010.50020.blaisorblade@yahoo.it> <3524bf1f05051607085609e111@mail.gmail.com> <200505161908.08373.blaisorblade@yahoo.it> <3524bf1f05051611528eb7bc1@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3524bf1f05051611528eb7bc1@mail.gmail.com> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Mon, 16 May 2005 16:52:33 -0400 To: Young Koh Cc: Blaisorblade , user-mode-linux-devel@lists.sourceforge.net On Mon, May 16, 2005 at 02:52:37PM -0400, Young Koh wrote: > Suppose the tracee attmpts to invoke a host system call. then, it will > be intercepted by the tracer as in TT mode. (In TT mode, the tracer > turns off tracing and sends SIGUSR2 to the tracee, and then, the > signal handler in the tracee will execute the system call.) but, in > SKAS mode, because the tracee doesn't have the UML kernel code, only > the tracer knows about the system call code. The tracer cannot simply > send a signal to make the tracee execute the system call. Then how > does it do? Does the tracer execute the system call for the tracee? The tracer is the kernel, so it just executes the system call. Jeff ------------------------------------------------------- This SF.Net email is sponsored by Oracle Space Sweepstakes Want to be the first software developer in space? Enter now for the Oracle Space Sweepstakes! http://ads.osdn.com/?ad_id=7412&alloc_id=16344&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel