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List of possible exit codes from Roslaunch

So I've been seeing exit codes come out of roslaunch, example:

[process name] process has died [pid 1234, exit code -11].

I have seen mostly negative exit codes. Are these signals/bash exit codes? -11 appears to be a Seg Fault. What's -6?

Is there a chart of the possible values it could send out and does it send out user exit codes as well?