Try one of these options:

• from within the app, use QProcess::startDetached to start another instance of the app, then exit (the parent) immediately
• run the app from a kind of wrapper which restarts the app every time it exits, unless it signals somehow that it really wants to exit (e.g. exiting with a certain magic exit code, or touching some known file)

rohanpm wrote:

• from within the app, use QProcess::startDetached to start another instance of the app, then exit (the parent) immediately

I would suggest an improvement for that:

• fork.
• in parent: terminate the app.
• in child: make a delay, so your app gets enough time to terminate and use QProcess as offered above.