Author Lukasa
Recipients Lukasa, Theodore Tso, christian.heimes, dstufft, larry, lemburg, martin.panter, ncoghlan, vstinner
Date 2016-06-09.08:14:40
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Message-id <1465460080.21.0.718158224678.issue27266@psf.upfronthosting.co.za>
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> But Theodore Ts'o said on the tracker: if you call getrandom() and don't pass in GRND_RANDOM, it's equivalent to /dev/urandom.  So, if getrandom is available, getrandom(flags=0) will always work and never block.

Can we please try to be clear about what kind of blocking we mean? getrandom(flags=0) absolutely *can* block: that's what the original issue was all about. To ensure it *never* blocks you need to call getrandom(GRND_NONBLOCK): that's why the flag exists.

Put another way:

- getrandom(flags=GRND_RANDOM) == /dev/random
- getrandom(flags=GRND_NONBLOCK) == /dev/urandom on Linux
- getrandom(flags=0) == /dev/urandom everywhere but Linux
History
Date User Action Args
2016-06-09 08:14:40Lukasasetrecipients: + Lukasa, lemburg, ncoghlan, vstinner, larry, christian.heimes, martin.panter, dstufft, Theodore Tso
2016-06-09 08:14:40Lukasasetmessageid: <1465460080.21.0.718158224678.issue27266@psf.upfronthosting.co.za>
2016-06-09 08:14:40Lukasalinkissue27266 messages
2016-06-09 08:14:40Lukasacreate