Recover after subprocess crashes/dies

[septatrix]

When a subprocess of the browser crashes the behaviors can differ depending on which subprocess crashed, however, there is no mechanism to recover from this or show this to the user. Chromium for example shows the "Aww snap" page when something goes awry. Cog (another popular kiosk browser based on Webkit) has a flag --webprocess-failure=restart which automatically restarts crashed processes. Alternatively one can tell cog to exit and handle it manually.

qt-kiosk-browser has none of these mechanisms or indicators. We are currently investigating switching from cog to this project, however, having no way to gracefully recover (or at least be able to configure the whole browser to terminate) is currently a showstopper as some crashes are inevitable after a certain scale (and in some rare circumstances we have also seen out-of-memory kills which similarly lead to a browser without e.g. a render process)