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Graceful Shutdown: Handle SIGTERM and SIGINT in Python and Node, Exit Codes 143 and 130, and Orphaned Children

By ThisIsDave — Dave Saylor

Executed on Linux: a Python handler printing got SIGTERM then cleanup done and exiting 0, KeyboardInterrupt from SIGINT, default SIGTERM giving exit status 143, a Node handler that drains then exits 0, and a background child that survived its parent receiving SIGTERM.