Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
From: "Chris January" <chris AT atomice DOT net>
To: <avadekar AT certicom DOT com>, "Cygwin AT Cygwin DOT Com" <cygwin AT cygwin DOT com>
Subject: RE: Weird top bug?
Date: Fri, 6 Jun 2003 23:44:49 +0100
Message-ID: <ICEBIHGCEJIPLNMBNCMKOEEGCHAA.chris@atomice.net>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
Importance: Normal
In-Reply-To: <20030606194024.GA10935@certicom.com>

> I've stumbled across some peculiar behaviour for top.  I've got
> the following
> script (vping) that I use to keep a VPN connection alive:
> 	#!/bin/sh
> 		while true;
> 		do
> 			ping -n 1 remoteMachine >/dev/null
> 			sleep 60
> 		done
>
> I typically run this as a background task (vping &), then telnet to
> remoteMachine.
>
> Now when I quit telnet, then exit the shell (vping was run from),
> the shell
> stays around.  My script has a stdout handle, I suppose.  That's OK, I can
> close the window with the mouse, and then vping dies.  Seems
> normal.  But if I
> leave the shell open after typing exit, then run top in another shell, it
> clears the screen, shows exactly one line of output (in this
> specific case):
> 	 15:23:03 up  8:00,  2 users,  load average: 0.00, 0.00, 0.00
>
> and locks up.  Control C does not regain shell control.
>
> If I open another shell and use ps to find the process number for
> top, I can
> kill it (kill pid, no explicit signal type).
>
> It doesn't seem to me that my specific script should have
> anything to do with
> how top is behaving, but I supose it is possible.  Seems more like top is
> having trouble because the parent process of my script is no longer valid.
> Maybe the parent process is gone, but top uses a windows thing to
> enumerate
> processes, and the open shell still has an entry in that list?
Please post the output of cygcheck.

Chris


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/