Christian Heimes added the comment:

OpenSSL kinda takes care of that. The PRNG mixes the PID into the seed so 
parent and child won't see the same output. The patch fixes a slightly more 
tricky issue:

- parent initializes PRNG but never touches the PRNG again
- parent forks lots of child processes
- PIDs get reused -- two child processes with same PID get same pseudorandom 
data

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19227>
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