[Pharo-project] VM Exit Value

Hi, For scripting purposes, I would like to use/control the VM exit status/value (on Linux). There is SmalltalkImage>>#snapshot:andQuit: but there is nothing there that indicates that one can set the process exit status. Is there a way to do that ? Has anyone a good idea on how the CogVM could communicate back to its invoking script whether is ran OK or not ? Thx, Sven