Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753494AbZIJTVE (ORCPT ); Thu, 10 Sep 2009 15:21:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753268AbZIJTVD (ORCPT ); Thu, 10 Sep 2009 15:21:03 -0400 Received: from terminus.zytor.com ([198.137.202.10]:46005 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753134AbZIJTVC (ORCPT ); Thu, 10 Sep 2009 15:21:02 -0400 Message-ID: <4AA950C8.1080200@zytor.com> Date: Thu, 10 Sep 2009 12:17:28 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 To: Mauro Carvalho Chehab CC: Alan Cox , Alan Cox , LKML , Kay Sievers , Andrew Morton , Greg Kroah-Hartman Subject: Re: [PATCH] char/tty_io: fix legacy pty name when more than 256 pty devices are requested References: <20090908144942.76ddf0e7@caramujo.chehab.org> <4AA6DF50.3030603@zytor.com> <20090908203323.486c129c@caramujo.chehab.org> <4AA6F63F.7090009@zytor.com> <20090908235441.04549a29@caramujo.chehab.org> <4AA73309.8030302@zytor.com> <20090910010512.60a1f523@caramujo.chehab.org> <4AA89B02.1050909@zytor.com> <20090910093301.4ccfd786@caramujo.chehab.org> <20090910150716.66310f02@lxorguk.ukuu.org.uk> <4AA92487.5080401@zytor.com> <20090910161215.5129bd71@caramujo.chehab.org> In-Reply-To: <20090910161215.5129bd71@caramujo.chehab.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1362 Lines: 30 On 09/10/2009 12:12 PM, Mauro Carvalho Chehab wrote: > > +1. Reusing the namespace after tty[p-za-e][0-9a-f] doesn't seem to be good, IMHO. > I think it's better to extend the strings with the current prefixes than to burn the virgin ttyf* prefix. > In the case of the BSD sockets, the patch is not just an userless fix. This is > interesting when some applications are ported from other Unix'es and still uses BSD > pty's, since several other Unix flavors were defining a higher namespace size. > > For example, on zOS Unix, a pty device seems to allow up to 10.000 pty numbers (in the > specific case of zOS Unix, they seem to be defined as /dev/[pt]typ[0-9]...) as shown at: > www.redbooks.ibm.com/redbooks/pdfs/sg245228.pdf > Yes, but you have to port the application *anyway* do deal with the namespace. BSD tty allocation is done largely by each application, which makes it even worse. Furthermore, there is the static allocation issue, so unless there is a concrete application which needs this *and* cannot be ported to Unix98 ptys (which is the Right Thing[TM] to do) I think Alan is right. -hpa -- 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/