Marc-Andre Lemburg added the comment: On 09.06.2016 09:57, STINNER Victor wrote: > > STINNER Victor added the comment: > > I played with select() on Linux on a VM: > > * /dev/random: it works as expected > * /dev/urandom: the device is already seen as readable even before the > urandom entropy pool is initialized. It is not really surprising since, yes, > read() does not block in practice > > To test Python before urandom is initialized, I used the init=/path/to/python > trick in the boot loader.
It's best to look at the code for this in Linux: http://lxr.free-electrons.com/source/drivers/char/random.c getrandom() is implemented directly on top of the two devices: http://lxr.free-electrons.com/source/drivers/char/random.c#L1601 > By the way, I confirm that getrandom(GRND_NONBLOCK) fails with EAGAIN before > urandom is initialized. Right, and that's good, since it's better to let the application control what to do than to simply block. Here's a good reading on getrandom(): https://lwn.net/Articles/606141/ ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27266> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
