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

[STINNER Victor]

STINNER Victor added the comment:

IHMO we only need two functions. os.urandom() is now documented as the
reference for security. So we need a new function. I proposed a new
urandom() parameter, but a new function without parameter would also be ok.

If os.getrandom() is directly a binding of Linux/Solaris getrandom(), I
will not use it since it would not be portable.

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