[Gambas-user] Saving settings on system shutdown

[Bruce Steers]

On Sun, 3 Oct 2021 at 15:46, bb <adamnt42 at gmail.com> wrote:

> On Sun, 2021-10-03 at 11:59 +0100, Bruce Steers wrote:
> > I have a program that starts with my system and runs in the
> > background.
> >
> > It has icons i can move and on exit it saves the positions.
> >
> > I have noticed if i do not exit the program but shutdown the computer
> > the
> > settings do not save.
> >
> > Of course i could just save the settings on moving icons but i
> > wondered if
> > there is a recommended method to catch an application exit due to a
> > shutdown?
> > Does the system just kill the program?
> >
> > I guessed DBus would probably be the best alternative way but
> > wouldn't hurt
> > to ask the experts if there is already an easier way.
> >
> > Thanks for any advice :)
> >
> > BruceS
> > ----[ http://gambaswiki.org/wiki/doc/netiquette ]----
> This is an "I think" answer.
> IT it depends on the distro.
> IT most shutdowns for sysvinit systems use /etc/rc0.d/ scripts one of
> which (say "K02sendsigs") controls the ending of "all" processes in
> some manner, e.g. by sending them a SIGxxx (usually? a SIGHUP) signal
> and then possibly waiting until "them" exits (or if they dont, then
> killing them).
> IT I dont know how systemd does it but hopefully it involves a signals
> based method as well.
>
> So, IT you should implement signal handling for your program via
> gb.signal, find out whether you can trap the shutdown SIG used and then
> do whatever you need.
>
> Interested in the answer btw.
>
> cheers
> bruce
>

Cheers folks

Got no results yet.
have tried catching various signals SIGQUIT SIGPWR SIGHUP
Computer just shuts down, no activity from application.

Benoit. what does the gambas runtime do with my app on a shutdown call?
is it a non intercept-able method that just kills the app so any attempt at
catching would be a waste of time?
Or is it completely unhandled?

Thanks (to all who advise)

BruceS
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