Re: Patch to disarm timers after an exec syscall

[Chris Wright <chrisw@osdl.org>]

* Gernot Payer (gpayer@suse.de) wrote:
> Hi all,
> 
> while running the openposix testsuite I saw testcase timer_create/9-1.c 
> failing. This testcase tests whether timers are disarmed when a process calls 
> exec, as described in e.g. 
> http://www.opengroup.org/onlinepubs/009695399/functions/timer_create.html.

> 
> The attached one-liner patch (+ one line comment) fixes this issue. I did the 
> diff against 2.6.12.1, but the fix is pretty much the same for every other 
> 2.6.x kernel I had a look at.

No, this can't do.  It conflicts with the other bit of requirements.
Specifically:
http://www.opengroup.org/onlinepubs/009695399/functions/exec.html

As you mention:

  [TMR] Per-process timers created by the calling process
  shall be deleted before replacing the current process image with the new
  process image.

But also:

  The new process shall inherit at least the following attributes from the
  calling process image:
  <snip>
  o [XSI] Interval timers

And this kills the latter.

thanks,
-chris