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Re: upstart: please update to latest upstream version

On Sun, Mar 11, 2012 at 7:25 AM, Vincent Bernat <bernat@debian.org> wrote:
> OoO  En  cette nuit  nuageuse  du mercredi  07  mars  2012, vers  00:21,
> Fernando Lemos <fernandotcl@gmail.com> disait :
>>> To give one particular example: systemd uses Linux-specific features to
>>> accurately track all the processes started by a service, which allows
>>> accurate monitoring and shutdown of processes which could otherwise
>>> disassociate themselves from their parent processes via the usual
>>> daemonizing trick.  POSIX doesn't provide features that allow this in
>>> general, but Linux does.  (Quite possibly other OSes provide those
>>> features too, but not in a standardized way.)
>> By the way, upstart uses ptrace for this:
>> http://netsplit.com/2007/12/07/how-to-and-why-supervise-forking-processes/
>> It's an interesting trick, and probably more portable too.
> Maybe we could  have an intermediate goal to patch any  daemon to add an
> option  to not  fork on  start.  If  any daemon  can be  started without
> forking, it seems  easy to start/stop them without  cgroups.  This would
> allow to generate a sysvinit  script from systemd service description. I
> don't  know  any daemon  that  does  not have  a  flag  to  not fork  on
> start. The number of daemons to patch may be low.
> This will not be  as clean as using cgroups, but it  won't be worst than
> the actual situation.

I don't quite understand the problem you're trying to solve. Both
upstart and systemd already handle cases where the daemon doesn't have
the option of not forking.


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