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Wed Jun 15 01:41:32 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-June/145198.html

On 06/14/2016 08:07 AM, Steven D'Aprano wrote:
> Is this right? I thought we had decided that os.urandom should *not*
> fall back on getrandom on Linux?

We decided that os.urandom() should not *block* on Linux.  Which it 
doesn't; we now strictly call getrandom(GRND_NONBLOCK), which will never 
block.  getrandom() is better because it's a system call, instead of 
reading from a file.  So it's much less messy.

If getrandom() wanted to block, instead it'll return EAGAIN, and we'll 
fail over to reading from /dev/urandom directly, just like we did in 3.4 
and before.

It's all working as intended,

//arry/
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[Python-Dev] [Python-checkins] cpython (3.5): Fix os.urandom() using getrandom() on Linux