From owner-freebsd-arch@FreeBSD.ORG  Fri Jan 27 17:47:50 2006
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
X-Original-To: arch@freebsd.org
Delivered-To: freebsd-arch@FreeBSD.ORG
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id DF9D016A5FE;
	Fri, 27 Jan 2006 17:47:35 +0000 (GMT)
	(envelope-from wollman@khavrinen.csail.mit.edu)
Received: from khavrinen.csail.mit.edu (khavrinen.csail.mit.edu [128.30.28.20])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 3690344426;
	Fri, 27 Jan 2006 17:24:34 +0000 (GMT)
	(envelope-from wollman@khavrinen.csail.mit.edu)
Received: from khavrinen.csail.mit.edu (localhost.csail.mit.edu [127.0.0.1])
	by khavrinen.csail.mit.edu (8.13.1/8.13.4) with ESMTP id k0RHOURf034302
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256
	verify=OK CN=khavrinen.csail.mit.edu issuer=Client+20CA);
	Fri, 27 Jan 2006 12:24:32 -0500 (EST)
	(envelope-from wollman@khavrinen.csail.mit.edu)
Received: (from wollman@localhost)
	by khavrinen.csail.mit.edu (8.13.1/8.13.4/Submit) id k0RHOUat034301;
	Fri, 27 Jan 2006 12:24:30 -0500 (EST) (envelope-from wollman)
Date: Fri, 27 Jan 2006 12:24:30 -0500 (EST)
From: Garrett Wollman <wollman@khavrinen.csail.mit.edu>
Message-Id: <200601271724.k0RHOUat034301@khavrinen.csail.mit.edu>
To: glebius@freebsd.org
X-Newsgroups: mit.lcs.mail.freebsd-arch
In-Reply-To: <20060127093602.GO83922@cell.sick.ru>
Organization: MIT Computer Science & Artificial Intelligence Lab
X-Greylist: Sender DNS name whitelisted, not delayed by milter-greylist-2.0.2
	(khavrinen.csail.mit.edu [127.0.0.1]);
	Fri, 27 Jan 2006 12:24:33 -0500 (EST)
X-Spam-Status: No, score=-0.0 required=5.0 tests=SPF_HELO_PASS,SPF_PASS 
	version=3.1.0
X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on 
	khavrinen.csail.mit.edu
Cc: arch@freebsd.org
Subject: Re: fix return code for pipe(2) syscall
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 27 Jan 2006 17:47:50 -0000

In article <20060127093602.GO83922@cell.sick.ru> you write:

>Yes, according to SUSv3 the only errors from pipe(2) are ENFILE
>and EMFILE.

POSIX does not define an exhaustive enumeration of error conditions.
*Any* error return is permissible, provided only that *for those
conditions noted in the ERRORS section* the code identified for that
condition is returned.  It is perfectly permissible for every system
call to fail with [ENOTADUCK] unless the first five bytes of the
caller's address space contain the word "quack".

-GAWollman