[issue18756] os.urandom() fails under high load

[Charles-François Natali]

Charles-François Natali added the comment:

> Attaching a patch to make error reporting better.

Why didn't you include ENODEV?
Apparently it can be reported in some corner cases, e.g. in this patch:
http://lfs-matrix.net/patches/downloads/linux/linux-2.6.14.2-pseudo_random-1.patch

Otherwise, wouldn't self.addCleanup be simpler than the large
try/finally block in the test (but it's not available on 2.7)?

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