flock
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Mention netbsd flock
See https://github.com/NetBSD/src/tree/ed7fc5e210be907bf259f5ccb9ebcfa39043153b/usr.bin/flock
See https://github.com/NetBSD/src/tree/ed7fc5e210be907bf259f5ccb9ebcfa39043153b/usr.bin/flock