[maemo-developers] Check if application is run

[From: Michael Stepanov]

Thanks for your suggestions. IMHO the most appropriate way (but probably not
easiest) is to use DBUS functionality as Mika Yrjölä described. What do you
think?

On 11/15/07, Eero Tamminen <eero.tamminen at nokia.com> wrote:
>
> Hi,
>
> ext Aleksandr Koltsoff wrote:
> > Eero Tamminen wrote:
> >> ext Aleksandr Koltsoff wrote:
> >>> I think in your case it would be sufficient to do something like this:
> >>> while true; do
> >>>   ./run-your-application params
> >>>   sleep 2
> >>> done
> >>>
> >>> Or in C:
> >>>
> >>> while(1) {
> >>>   system("./run-your-application params");
> >>>   sleep(2);
> >>> }
> >> That would shorten the battery life. If one really needs/wants
> >> to kludge things with polling, the interval should be several
> >> times larger.
> >
> > When the application is running, both methods wait for the process to
> > terminate, i.e., no polling. man 3 system. The idea originally was that
> > should the application terminate, it will be restarted after a while.
>
> Sorry, I didn't read your mail properly (need to get new glasses
> one of these days...), I just saw the "sleep 2".
>
>
> > If the application is completely broken, and will fail to start in any
> > case, then this would amount to polling, and would shorten battery life.
>
> This would happen also if the process daemonizes itself.
>
>
> > My original post did suggest handling exit codes of the child properly,
> > but I guess that was lost somewhere in the process..
> >
> >>> Linux (kernel) does not have a non-polling mechanism to track
> >>> PID-existance for non-related processes.
> >> It has, you just need to be the process parent.  :-)
> >
> > Note the "non-related" part :-). Parent <-> child = related processes.
>
>
>         - Eero
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>



-- 
Cheers,
Michael
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