watchdog implementation on S60 3rd

I am trying to implement a watchdog process that will re launch the main process if it crashes.
I am creating the watchdog from the main process using this code:

   RProcess server;
   server.Create(_L("c:\\sys\\bin\\watchdog.exe"), _L(""));
   
   CApaCommandLine* commandLine = CApaCommandLine::NewL();
   commandLine->SetExecutableNameL(_L("c:\\sys\\bin\\watchdog.exe"));
   commandLine->SetProcessEnvironmentL(server);
   RApaLsSession ApaSession;
   ApaSession.Connect();
   ApaSession.StartApp(*commandLine);
   ApaSession.Close();

the problem is that when the main process crashes, the watchdog process goes down with it, rendering it useless as a watchdog.

any ideas ?