linux-kernel - Re: get amount of "entropy" in /dev/random ?

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Message-ID: <470265C1.5040006@redhat.com>
Date:	Tue, 02 Oct 2007 17:37:37 +0200
From:	Michal Schmidt <mschmidt@...hat.com>
To:	Yakov Lerner <iler.ml@...il.com>
CC:	Kernel Linux <linux-kernel@...r.kernel.org>
Subject: Re: get amount of "entropy" in /dev/random ?

Yakov Lerner wrote:
> >From the userlevel, can I get an estimate of  "amount of entropy"
> in /dev/random, that is, the estimate of number of bytes
> readable until it blocks ? Of course multiple processes
> can read bytes and this would not be exact ... but still .. as an upper
> boundary estimate ?
>
> Thanks
> Yakov

Try ioctl(fd, RNDGETENTCNT, &entropy_count)

Michal

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