From owner-freebsd-questions  Fri Apr  6  1:16: 2 2001
Delivered-To: freebsd-questions@freebsd.org
Received: from guru.mired.org (okc-65-26-235-186.mmcable.com [65.26.235.186])
	by hub.freebsd.org (Postfix) with SMTP id 94EF337B423
	for <questions@freebsd.org>; Fri,  6 Apr 2001 01:15:59 -0700 (PDT)
	(envelope-from mwm@mired.org)
Received: (qmail 68814 invoked by uid 100); 6 Apr 2001 08:15:58 -0000
From: Mike Meyer <mwm@mired.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <15053.31549.888973.547913@guru.mired.org>
Date: Fri, 6 Apr 2001 03:15:57 -0500
To: Lucas Bergman <lucas@slb.to>
Cc: questions@freebsd.org
Subject: Re: [OT] Reinstalling signal handler inside signal handler
In-Reply-To: <127310561@toto.iv>
X-Mailer: VM 6.90 under 21.1 (patch 14) "Cuyahoga Valley" XEmacs Lucid
X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`;h9L,Yg`+vb1>RG%
 *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Lucas Bergman <lucas@slb.to> types:
> > > Signals on "traditional" systems (V7, System V) were reset to
> > > their default behavior after they were raised, so the signal
> > > handler had to reinstall itself if it was to persist.  BSD changed
> > > that; you have to deliberately reset a signal's behavior (excuse
> > > the split infinitive).  Linux actually follows the old semantics,
> > > but you can include <bsd/signal.h> instead of <signal.h> (or call
> > > __bsd_signal() instead of signal()) to get the BSD semantics.
> > 
> > Lucas, thanks for your answer.  For the record, it seems like Linux
> > does use the *BSD* sematics that you describe above.
> 
> I'll be damned.  The following code demonstrates that you're right:

Could this be one of the distributions differences? A distribution
could replace <signal.h> with an include (or symlink to)
<bsd/signal.h> to make the bsd behavior the default.

	<mike
--
Mike Meyer <mwm@mired.org>			http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message