From owner-freebsd-hackers@FreeBSD.ORG  Sat Nov  7 02:34:12 2009
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1FF76106566B
	for <freebsd-hackers@freebsd.org>; Sat,  7 Nov 2009 02:34:12 +0000 (UTC)
	(envelope-from nate@thatsmathematics.com)
Received: from euclid.ucsd.edu (euclid.ucsd.edu [132.239.145.52])
	by mx1.freebsd.org (Postfix) with ESMTP id 01B888FC12
	for <freebsd-hackers@freebsd.org>; Sat,  7 Nov 2009 02:34:11 +0000 (UTC)
Received: from zeno.ucsd.edu (zeno.ucsd.edu [132.239.145.22])
	by euclid.ucsd.edu (8.11.7p3+Sun/8.11.7) with ESMTP id nA72YBo17750;
	Fri, 6 Nov 2009 18:34:11 -0800 (PST)
Received: from localhost (neldredg@localhost)
	by zeno.ucsd.edu (8.11.7p3+Sun/8.11.7) with ESMTP id nA72YBU16331;
	Fri, 6 Nov 2009 18:34:11 -0800 (PST)
X-Authentication-Warning: zeno.ucsd.edu: neldredg owned process doing -bs
Date: Fri, 6 Nov 2009 18:34:11 -0800 (PST)
From: Nate Eldredge <nate@thatsmathematics.com>
X-X-Sender: neldredg@zeno.ucsd.edu
To: Alexander Best <alexbestms@math.uni-muenster.de>
In-Reply-To: <permail-2009110702174980e26a0b00004745-a_best01@message-id.uni-muenster.de>
Message-ID: <Pine.GSO.4.64.0911061833080.5432@zeno.ucsd.edu>
References: <permail-2009110702174980e26a0b00004745-a_best01@message-id.uni-muenster.de>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: freebsd-hackers@freebsd.org, Jilles Tjoelker <jilles@stack.nl>
Subject: Re: SIGUNUSED
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 07 Nov 2009 02:34:12 -0000

On Sat, 7 Nov 2009, Alexander Best wrote:

> Jilles Tjoelker schrieb am 2009-11-06:
>> On Fri, Nov 06, 2009 at 10:33:57PM +0100, Alexander Best wrote:
>>> some programmers tend to do the following in their apps to install
>>> a standard
>>> handler for all signals (mostly SIG_IGN):
>
>>> int counter;
>
>>> for (counter = 1; counter < SIGUNUSED; counter++)
>>>     signal(counter, SIG_IGN);

>> That code is wrong, SIGUNUSED is not meant to be used in that way. It
>> seems to originate from Linux, but it is not available on all
>> architectures there, and where it is available it is a valid signal.

> oh. i see. i'm not a linux user. that's why i thought SIGUNUSED was designed
> exactly for that purpose.

I think that's what NSIG was for.  But it seems to be BSD-specific, and 
perhaps obsolecent.

-- 

Nate Eldredge
nate@thatsmathematics.com