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| From: | "Campbell, Rolf [SKY:1U32:EXCH]" <moscoop AT americasm01 DOT nt DOT com> |
| Newsgroups: | comp.os.msdos.programmer,comp.os.msdos.djgpp |
| Subject: | Re: Uptime and entropy in DOS |
| Date: | Fri, 11 Feb 2000 09:47:00 -0500 |
| Organization: | Nortel Networks |
| Lines: | 15 |
| Message-ID: | <38A420E4.27CA35B2@americasm01.nt.com> |
| References: | <lra6ascbh1fu2d4738d44h09kpooc8ecta AT 4ax DOT com> |
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| To: | djgpp AT delorie DOT com |
| DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
| Reply-To: | djgpp AT delorie DOT com |
Damian Yerrick wrote:
> Is it possible to get the uptime of a DOS system? I need more entropy
> than the 32 bits I get from time(NULL) to initialize a pseudorandom
> number generator. Is there a predictable way to get at least 64 bits
> of entropy?
On Pentium's, there is a 64-bit cycle counter, but the upper bits
will always be zero unless the machine's been running a few years...
--
(\/) Rolf Campbell (\/)
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