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MathGroup Archive 1994

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RESULTS of [mg 169] - InputString[] problem

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg209] RESULTS of [mg 169] - InputString[] problem
  • From: p.kent at ic.ac.uk
  • Date: Mon, 21 Nov 94 14:26:13 GMT

Thanks to everyone who responded to my posting. A few days
later I got a response from WRI Technical Support which 
seems to clear up the matter. 

The problem is with "System V"-style Unix and a *network*
Mathematica license. The license mechanism works by enquiring
every few minutes during a Mathematica session whether the
license is still valid (clever stuff, eh?). Now, when the 
kernel is sitting waiting for an input for InputString[], it
is still querying the license server, and in System V Unix,
the license server sends back a response which triggers the
"EndOfFile" break. This has been registered by WRI as a bug,
and a fix is being worked on.

You won't see this problem with BSD-type Unix, or if you
have a stand-alone Mma license, or if you're using any front
dialog box). Nor will it occur on NeXT, Mac or PC machines.

The Unix machines where this was observed to happen are:

 Sun SOLARIS (but not SunOS)
 HP Unix
 Silicon Graphics IRIX
 DEC OSF/1

and, presumably, any other System V-based Unix.

Regards, Phillip Kent.

----------------------------------+----------------------------
 Dr Phillip Kent                  | Email: p.kent at ic.ac.uk 
 Transitional Mathematics Project | 
 Mathematics Department           | Tel: +44 (0)71 59 48503 
 Imperial College                 | Fax: +44 (0)71 59 48517   
 180 Queen's Gate                 |   
 London SW7 2BZ                   | Project World-Wide-Web at: 
 United Kingdom.                  | http://othello.ma.ic.ac.uk
----------------------------------+----------------------------





From root Thu Nov 24 07:37:41 1994
Received: by lead.wri.com id AA10905
  (5.67b/IDA-1.4.4 for sw); Thu, 24 Nov 1994 07:37:41 -0600
Date: Thu, 24 Nov 1994 07:37:41 -0600
From: Operator <root>
Message-Id: <199411241337.AA10905 at lead.wri.com>
To: goyle, rory, sw
Subject: Rdist Backup Report for /swolf3

woodlark: updating host woodlark
woodlark: /swolf3/Archives/Mail/94-10.out: Warning: remote copy is newer
woodlark: /swolf3/Archives/Mail/94-11.in: updating
woodlark: /swolf3/Archives/Mail/94-11.out: updating
woodlark: /swolf3/Archives/Cawley/Papers/flows.tex: No name for group 183
woodlark: /swolf3/Archives/Cawley/Papers/flows.tex: updating
woodlark: /swolf3/private/vm/swapfile.front: updating
woodlark: updating of woodlark finished




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