Re: How to detect already running application...

["Miroslav Rajcic" <rajcic sokrates hr>]

Is there any gtk-only way (not Gnome oriented) to do this ?
I am looking for the same answer for my app, and the code needs to be
working on Windows too.

Windows-only code is pretty simple using named mutex to act as kind of
interprocess semaphore.
But I am not sure if it can be that simple on Linux.

Best regards,
  Miroslav Rajcic

----- Original Message ----- 
From: "John (J5) Palmieri" <johnp redhat com>
To: <fredderic excite com>
Cc: <gtk-app-devel-list gnome org>
Sent: Friday, March 18, 2005 3:00 PM
Subject: Re: How to detect already running application...


> There are a number of hacks to do this.  gnome-volume-manager uses the
> clipboard.  NetworkManager uses D-Bus.  I'm not sure what g-edit uses,
> perhaps bonobo.  Future looking D-Bus is the way to go.  You basically
> grab a name and when your app comes up a second time it will get an
> error when trying to grab the name again.  It can then send messages to
> the first instance to tell it what to do.
>
> --
> J5
>
> On Thu, 2005-03-17 at 20:42, Freddie Unpenstein wrote:
> > Hello peoples of the net...
> >
> > I was wondering, if anyone has come across any reliable means to find an
already running instance of your application, and get it to present itself
instead of starting a new one.
> > I've done it in a small program I rolled together quickly, by creating a
pid file in /tmp.  If the file exists and contains a number, it attempts to
send a SIGUSR1 to the pid contained therein and then quits.  If not, it
starts like usual.  On reciept of a SIGUSR1, the program simply does a
gtk_window_present() on its main window.
> > This does have issues...  For one, if the process doesn't close down
properly, the pid file will remain, and after some time a new process may
well exist with the same pid, and the default handler for SIGUSR1 is to kill
the process.  And secondly, my creation of the pid file isn't without a few
race conditions.  While it's not a highly critical application, I would like
to know if there's a safer and more reliable method of doing this.
> > Fredderic
> >
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