From owner-freebsd-questions@FreeBSD.ORG  Mon Dec 22 14:33:37 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C688E1065673
	for <freebsd-questions@freebsd.org>;
	Mon, 22 Dec 2008 14:33:37 +0000 (UTC)
	(envelope-from gandalf@shopzeus.com)
Received: from shopzeus.com (135-shost.hostoffice.hu [195.228.74.135])
	by mx1.freebsd.org (Postfix) with ESMTP id 893DD8FC13
	for <freebsd-questions@freebsd.org>;
	Mon, 22 Dec 2008 14:33:37 +0000 (UTC)
	(envelope-from gandalf@shopzeus.com)
Received: from [192.168.1.104] (localhost [127.0.0.1])
	by shopzeus.com (Postfix) with ESMTP id 3C521392435
	for <freebsd-questions@freebsd.org>;
	Mon, 22 Dec 2008 09:11:25 -0500 (EST)
Message-ID: <494FA0E0.1060108@shopzeus.com>
Date: Mon, 22 Dec 2008 15:14:56 +0100
From: Laszlo Nagy <gandalf@shopzeus.com>
User-Agent: Thunderbird 2.0.0.18 (X11/20081125)
MIME-Version: 1.0
To: freebsd-questions@freebsd.org
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Subject: "truss" is buggy?
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Dec 2008 14:33:37 -0000

Apparently, the "truss" trace tool has a bug. At least I was told that 
the tracer program should not change the return value of the getppid() 
call inside the traced process. Here is an example program:

%cat test.c
#include <stdio.h>

int main() {
   while(1) {
       sleep(5);
       printf("ppid = %d\n", getppid());
   }
}

%gcc -o test test.c
%./test
ppid = 47653
ppid = 47653
ppid = 47653 # Started "truss -p 48864" here!
ppid = 49073
ppid = 49073
ppid = 49073


I cannot install strace, beacuse my platform is amd64. What other 
options do I have?

Thanks

   Laszlo