[issue27266] Always use getrandom() in os.random() on Linux and add block=False parameter to os.urandom()

[STINNER Victor]

STINNER Victor added the comment:

> Second, unless you can guarantee you support blocking / non-blocking behavior on all platforms, this is a bad move.

Well, there are two options:

* Detect when os.urandom() is going to block, and falls back to weaker entropy (Linux: /dev/urandom in non-blocking mode, others: getpid+time?).
* Never use os.urandom() to seed random.Random when the randim module is imported: I suggest to discuss this option in the issue #27272

I would prefer to collect enough technical information before taking a decision (ensure that it's not possible to get a portable function to check if /dev/urandom is going to block.)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27266>
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