gh-135335: flush stdout/stderr in forkserver after preloading modules #135338
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…odules If a preloaded module writes to stdout or stderr, and the stream is buffered, child processes will inherit the buffered data after forking. Attempt to prevent this by flushing the streams after preload.
...or at least produce more useful output if they fail
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If a preloaded module writes to stdout or stderr, and the stream is buffered, child processes will inherit the buffered data after forking. Attempt to prevent this by flushing the streams after preload.