force coredump from child created by subprocess

[David Sveningsson]

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Hi, I am running a process using subprocess and detect if the process
crashes using .returncode. I would like to force coredumps being created
regardless of the system settings, eg run "ulimit -c unlimited" in the
childprocess.

I've had no luck using preexec_fn and os.system, it just made no
difference. I could probably add a thin wrapper script but I'm not very
fond of that idea.

Is there some easy way to force the childprocess to create a coredump if
it crashes?
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