Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757327AbXFGKs0 (ORCPT ); Thu, 7 Jun 2007 06:48:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750930AbXFGKsS (ORCPT ); Thu, 7 Jun 2007 06:48:18 -0400 Received: from pfx2.jmh.fr ([194.153.89.55]:39052 "EHLO pfx2.jmh.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750836AbXFGKsR (ORCPT ); Thu, 7 Jun 2007 06:48:17 -0400 Date: Thu, 7 Jun 2007 12:45:05 +0200 From: Eric Dumazet To: Alan Cox Cc: Davide Libenzi , Linux Kernel Mailing List , Linus Torvalds , Andrew Morton , Ulrich Drepper , Ingo Molnar Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2 Message-Id: <20070607124505.2d829b9b.dada1@cosmosbay.com> In-Reply-To: <20070607110623.53322dae@the-village.bc.nu> References: <20070606235906.72439d16@the-village.bc.nu> <20070607001932.35c9591c@the-village.bc.nu> <20070607110623.53322dae@the-village.bc.nu> X-Mailer: Sylpheed 2.3.1 (GTK+ 2.10.11; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1190 Lines: 25 On Thu, 7 Jun 2007 11:06:23 +0100 Alan Cox wrote: > > I don't think it's a matter of versioning. Many userspace libraries > > expects their fds to be compact (for many reasons - they use select, they > > use them to index 0-based arrays, etc...), and if the kernel suddendly > > starts returning values in the 1<<28 up arena, they sure won't be happy. > > So I believe that the correct way is that the caller specifically selects > > the feature, leaving the legacy fd allocation as default. > > I don't understand the connection between this paragraph (with which I > agree) and the urge to add a ton of ugly syscall hacks. "Caller > specifically selects feature" - > prctl(). Libraries get unhappy -> > linker issue. > Alan, prctl() things are usually inherited at fork()/exec() time. If you fork() from a new application , then exec an old one (eventually a statically linked program), we have a problem ? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/