[HACKERS] semaphore usage "port based"?

Andrew Thompson thompsa at freebsd.org
Mon Apr 3 03:59:19 UTC 2006

On Sun, Apr 02, 2006 at 11:41:01PM -0400, Kris Kennaway wrote:
> On Mon, Apr 03, 2006 at 12:30:58AM -0300, Marc G. Fournier wrote:
> > 'k, but how do I fix kill so that it has the proper behaviour if SysV is 
> > enabled?
> Check the source, perhaps there's already a way.  If not, talk to
> whoever made the change.
> > Maybe a mount option for procfs that allows for pre-5.x 
> > behaviour?
> procfs has nothing to do with this though.
> > I'm not the first one to point out that this is a problem, just 
> > the first to follow it through to the cause ;(  And I believe there is 
> > more then just PostgreSQL that is affected by shared memory (ie. apache2 
> > needs SysV IPC enabled, so anyone doing that in a jail has it enabled 
> > also) ...
> Also note that SysV IPC is not the problem here, it's the change in
> the behaviour of kill() that is causing postgresql to become confused.
> That's what you should investigate.

The ESRCH error is being returned from prison_check(), that would be a
good starting place.


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