From owner-freebsd-hackers  Thu Nov 13 12:01:12 1997
Return-Path: <owner-freebsd-hackers>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id MAA14429
          for hackers-outgoing; Thu, 13 Nov 1997 12:01:12 -0800 (PST)
          (envelope-from owner-freebsd-hackers)
Received: from whistle.com (s205m131.whistle.com [207.76.205.131])
          by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id MAA14423
          for <freebsd-hackers@FreeBSD.ORG>; Thu, 13 Nov 1997 12:01:10 -0800 (PST)
          (envelope-from archie@whistle.com)
Received: (from smap@localhost) by whistle.com (8.7.5/8.6.12) id MAA14091; Thu, 13 Nov 1997 12:00:36 -0800 (PST)
Received: from bubba.whistle.com(207.76.205.7) by whistle.com via smap (V1.3)
	id sma014087; Thu Nov 13 12:00:22 1997
Received: (from archie@localhost) by bubba.whistle.com (8.8.5/8.6.12) id MAA26869; Thu, 13 Nov 1997 12:00:21 -0800 (PST)
From: Archie Cobbs <archie@whistle.com>
Message-Id: <199711132000.MAA26869@bubba.whistle.com>
Subject: Re: unkillable process
In-Reply-To: <Pine.BSF.3.96.971113160142.15617D-100000@server.local.sunyit.edu> from Alfred Perlstein at "Nov 13, 97 04:02:23 pm"
To: perlsta@cs.sunyit.edu (Alfred Perlstein)
Date: Thu, 13 Nov 1997 12:00:21 -0800 (PST)
Cc: archie@whistle.com, Shimon@i-connect.net, freebsd-hackers@FreeBSD.ORG
X-Mailer: ELM [version 2.4ME+ PL31 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk


Alfred Perlstein writes:
> From what i understand the process 'cat' is not broken, the shell excuting
> the command will terminate if issued a 'kill -9'

Not on my machine... kill -9 does nothing (see original email).

-Archie

> .________________________________________________________________________ __ _
> |Alfred Perlstein - Programming & SysAdmin --"Have you seen my FreeBSD tatoo?"
> |perlsta@sunyit.edu                        --"who was that masked admin?"
> |http://www.cs.sunyit.edu/~perlsta
> :
> '
> 
> On Thu, 13 Nov 1997, Archie Cobbs wrote:
> 
> > Simon Shapiro writes:
> > > Hi Archie Cobbs;  On 12-Nov-97 you wrote: 
> > > >  Try the following experiment (on 2.2 and mabye 3.0):
> > > >  
> > > >  1. Create a named pipe
> > > >  2. Start typing into it using cat
> > > >  3. Hit control-C as many times as you want
> > > >  
> > > >  You'll see that the process will not die even with kill -9,
> > > >  as it is stuck in uninterrupible disk sleep ("fifo").
> > > >  
> > > >  But as soon as you read from the other end of the pipe,
> > > >  the process exits.
> > > >  
> > > >  Is there a missing PCATCH flag to tsleep() somewhere?
> > > >  Is this appropriate behavior? (hint: rhetorical question)
> > > 
> > > From what I remember, this is a typical (if ugly Unix behavior.
> > 
> > Hmm... does anyone else besides me have the opinion that,
> > while it may be typical, this behavior is also *broken*?
> > 
> > Still Curious,
> > -Archie
> > 
> > ___________________________________________________________________________
> > Archie Cobbs   *   Whistle Communications, Inc.  *   http://www.whistle.com
> > 
> 
> 

___________________________________________________________________________
Archie Cobbs   *   Whistle Communications, Inc.  *   http://www.whistle.com