[Info-vax] New OpenSSL update from HP

[Simon Clubley]

On 2015-06-15, <lists at openmailbox.org> <lists at openmailbox.org> wrote:
> On Mon, 15 Jun 2015 13:33:26 +0000 (UTC)
> Simon Clubley via Info-vax <info-vax at rbnsn.com> wrote:
>> In such a case you need a mechanism to identify all these processes
>> and kill them and you can't rely on the primary web server process
>> sending a shutdown message to the detached process; the detached
>> process may be stuck and not responding to application initiated
>> messages.
>
> I understood that part but not being familiar with the environment I didn't
> understand why doing this correctly would be difficult or unusual.
>
> Why couldn't the primary server send a message to the detached processes?
> Is there not a signaling mechanism and known best practices appropriate for
> this sort of thing?
>

Most of the time this would work ok, but any such design has to consider
the possibility that the detached process is no longer processing
messages from the main web server process due to logic problems.

With subprocesses (which are processes which live within the parent's
process tree) that doesn't matter because any such stuck subprocess would
be killed by VMS when the parent process exits. However, detached
processes, which are standalone processes not associated with the process
which created them, would not.

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world