Date: Fri, 20 Jun 2003 16:21:42 +0200 (CEST) From: Volker Stolz <stolz@i2.informatik.rwth-aachen.de> To: FreeBSD-gnats-submit@freebsd.org Cc: standards@freebsd.org Subject: interval timers not cleared in fork() Message-ID: <200306201421.h5KELfUh011622@menelaos.informatik.rwth-aachen.de>
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>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:
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