PATCH: waitpid in natPosixProcess.cc

[Casey Marshall]

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Attached is a simple patch that invokes waitpid if either the process
is destroy()ed or the C call to exec() fails.

This prevents Runtime.exec from spawning zombie processes if the given
command cannot be found, or if the process is killed. I wasn't sure if
it was appropriate to call waitFor instead, but (AFAIK) calling
waitpid in these two spots is safe.

- -- 
Casey Marshall || csm@gnu.org
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