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If we SIGKILL cooker (the parent process), ensure the worker notices and shuts down gracefully. To do this: * trigger the sigterm handler if the parent exits * ensure broken pipe writes don't trigger backtraces which interfer with other exit work * notice if our command pipe is broken due to EOF and sigterm if so (Bitbake rev: c43d6a8d711db8d3bd9a1976b9f8e3efdb4cb4ae) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>