From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751210AbWD2CtX (ORCPT ); Fri, 28 Apr 2006 22:49:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751471AbWD2CtX (ORCPT ); Fri, 28 Apr 2006 22:49:23 -0400 Received: from [198.99.130.12] ([198.99.130.12]:22493 "EHLO saraswathi.solana.com") by vger.kernel.org with ESMTP id S1751210AbWD2CtX (ORCPT ); Fri, 28 Apr 2006 22:49:23 -0400 Date: Fri, 28 Apr 2006 21:49:56 -0400 From: Jeff Dike To: Blaisorblade Cc: user-mode-linux-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Heiko Carstens , Bodo Stroesser Subject: Re: [uml-devel] [RFC] PATCH 3/4 - Time virtualization : PTRACE_SYSCALL_MASK Message-ID: <20060429014956.GB9734@ccure.user-mode-linux.org> References: <200604131720.k3DHKqdr004720@ccure.user-mode-linux.org> <200604261747.54660.blaisorblade@yahoo.it> <20060426154607.GA8628@ccure.user-mode-linux.org> <200604282228.46681.blaisorblade@yahoo.it> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200604282228.46681.blaisorblade@yahoo.it> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 28, 2006 at 10:28:46PM +0200, Blaisorblade wrote: > Ok, this gives us a definite proposal, which I finally like: > > * to exclude sys_tee: > > bitmask = 0; > set_bit(__NR_tee, bitmask); > ptrace(PTRACE_SET_NOTRACE, bitmask); > > * to trace only sys_tee: > > bitmask = 0; > set_bit(__NR_tee, bitmask); > ptrace(PTRACE_SET_TRACEONLY, bitmask); Yup, I like this. > the call fails if any of them is 1, and in the failure case E2BIG or > EOVERFLOW is returned strerror(E2BIG) is "Arg list too long" strerror(EOVERFLOW) is "Value too large for defined data type" Neither of those seems right. I'd just as soon stick with -EINVAL. Jeff