https://nalar.dev/tags/subprocess/ Recent content in Subprocess on Nalar Hugo en-us Fri, 04 Sep 2026 00:00:00 +0700 https://nalar.dev/avoid-subprocess-pipe-deadlocks-in-python/ Fri, 04 Sep 2026 00:00:00 +0700 https://nalar.dev/avoid-subprocess-pipe-deadlocks-in-python/ <p>Launching a command from Python is easy. Capturing its output is also easy. The trouble starts when a parent process waits for a child while the child is waiting for the parent to read from a pipe.</p> <p>That circular wait is a <strong>deadlock</strong>: neither process can make progress even though neither has crashed.</p> <p>This problem is especially confusing because the same code may work during testing and hang only when a command produces more output. Small output fits in an operating-system pipe buffer. Larger output can fill that buffer and expose the incorrect coordination.</p>