Documentation

The documentation of os.exec*() says:

The current process is replaced immediately. Open file objects and descriptors are not flushed, so if there may be data buffered on these open files, you should flush them using sys.stdout.flush() or os.fsync() before calling an exec* function.

However, os.fsync() flushs OS buffers to disk, and has nothing to with flushing userspace buffer to OS.

Linked PRs

• gh-133102: Remove unnecessary mention of os.fsync() from os.exec*() docs #133333