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Re: Random Number Seed

From: Olaf Lenz <olenz at Physik dot Uni-Bielefeld dot DE>
To: GSL Discussion List <gsl-discuss at sources dot redhat dot com>
Date: Tue, 22 Feb 2005 09:19:04 +0100
Subject: Re: Random Number Seed
References: <Pine.LNX.4.44.0403011221340.20444-100000@ganesh> <4219CC24.90200@physik.uni-bielefeld.de> <Pine.LNX.4.58.0502210726120.7876@lilith.rgb.private.net>

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Hello!

Robert G. Brown wrote:
|> My bad, sorry.  I was assuming that the system itself wasn't broken
|> here, so that /dev/random might be absent but wouldn't be broken.
[clip]

I do not blame you for the code! I would have probably written the same
code myself.

I was thinking along the same lines as you - that our system is broken.
It turned out that the problem is the queuing system "condor" that we
use. Condor wraps the system calls of the executable with its own
versions, and these lead to the strange behaviour described: the fopen()
call succeeds, the fread() returns 0 and does not set the seed, and
feof() is set.

Olaf
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References:
- Re: Random Number Seed
  - From: Olaf Lenz
- Re: Random Number Seed
  - From: Robert G. Brown

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