November 2025: Semaphores, expect tests, and "innocuous bytes"

My blog posts and notes from November 2025.

• On Linux IPC: "POSIX semaphores do not auto-release on exit" and "Inter-process synchronization methods"
• On my job scheduler project: "Expect-testing a job scheduler" and "Finding the right implementation for a job scheduler"
• "'Innocuous bytes' fools Claude" – Security through obscurity?

Writing I enjoyed

• "How to Make a Living as an Artist" by fnnch
• "I Program on the Subway" by Stephen D
• "What Galls a Hacker Most? The Metrocard" by Amy Harmon for The New York Times (1997)