From owner-freebsd-standards@FreeBSD.ORG  Fri Jun 20 07:21:44 2003
Return-Path: <owner-freebsd-standards@FreeBSD.ORG>
Delivered-To: freebsd-standards@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id A4E2B37B401; Fri, 20 Jun 2003 07:21:44 -0700 (PDT)
Received: from atlas.informatik.rwth-aachen.de
	(atlas.Informatik.RWTH-Aachen.DE [137.226.194.2])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 08A8B43FA3; Fri, 20 Jun 2003 07:21:43 -0700 (PDT)
	(envelope-from stolz@i2.informatik.rwth-aachen.de)
Received: from menelaos.informatik.rwth-aachen.de
	(menelaos.Informatik.RWTH-Aachen.DE [137.226.194.73])
	8.11.1-0.5) with ESMTP id h5KELgK20857;
	Fri, 20 Jun 2003 16:21:42 +0200
Received: (from stolz@localhost)h5KELfUh011622;
	Fri, 20 Jun 2003 16:21:42 +0200 (CEST)	(envelope-from stolz)
Date: Fri, 20 Jun 2003 16:21:42 +0200 (CEST)
Message-Id: <200306201421.h5KELfUh011622@menelaos.informatik.rwth-aachen.de>
To: FreeBSD-gnats-submit@freebsd.org
From: Volker Stolz <stolz@i2.informatik.rwth-aachen.de>
X-send-pr-version: 3.113
X-GNATS-Notify: 
cc: standards@freebsd.org
Subject: interval timers not cleared in fork()
X-BeenThere: freebsd-standards@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: Volker Stolz <stolz@i2.informatik.rwth-aachen.de>
List-Id: Standards compliance <freebsd-standards.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-standards>,
	<mailto:freebsd-standards-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-standards>
List-Post: <mailto:freebsd-standards@freebsd.org>
List-Help: <mailto:freebsd-standards-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-standards>,
	<mailto:freebsd-standards-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 20 Jun 2003 14:21:45 -0000


>Submitter-Id:	current-users
>Originator:	Volker Stolz
>Organization:	Lehrstuhl für Informatik II
>Confidential:	no 
>Synopsis:	interval timers not cleared in fork()
>Severity:	serious
>Priority:	low
>Category:	standards
>Class:		sw-bug
>Release:	FreeBSD 4.8-STABLE i386
>Environment:
System: FreeBSD menelaos.informatik.rwth-aachen.de 4.8-STABLE FreeBSD 4.8-STABLE #4: Tue Apr 29 11:28:13 CEST 2003 root@menelaos.informatik.rwth-aachen.de:/usr/obj/usr/src/sys/MENELAOS i386


>Description:
The FreeBSD man page says on calling fork():
"All interval timers are cleared; see setitimer(2)."

SUSv2 says that on invoking fork():
 - If the Timers option is supported, per-process timers created by the
    parent are not inherited by the child process.

However, a quick test reveals that only the REAL timer is stopped, PROF
and VIRTUAL keep running.
>How-To-Repeat:
Sample program which sets the timers, forks and checks if timers are still
enabled in the child at: http://www.foldr.org/~stolz/timer.c

virtual set: interval=1 500 value=1 500
REAL get: interval=0 0 value=0 0
PROF get: interval=1 500 value=1 500
VIRTUAL get: interval=1 500 value=1 500

>Fix: