Re: howto make system calls (newbie question)

[charleshixson@earthling.net (Charles Hixson)]

Kilgallen@eisner.decus.org.nospam (Larry Kilgallen) wrote in
<FNjDhEG2MwD3@eisner.encompasserve.org>: 

>In article
><Xns909B95495DD5Fcharleshixsonearthli@207.217.77.25>,
>charleshixson@earthling.net (Charles Hixson) writes: 
>
>...
>> Do you mean that all of your users are restricted to batch 
>> compile/execution cycles?  Then slave sysin to the card
>> reader and sysout to the line printer (Unit5 and Unit6, I
>> think they were called.)
>
>No, but users of interactive terminals (or emulators thereof)
>do not have access to the _console_.  There is only one
>console on the system.  There could be tens or hundreds of
>users (depending on the size of the machine).  From the
>console one can issue hardware commands to stop the machine,
>etc. 

OK.  In that case let it be re-stated as a request for access to 
terminal screen I/O.  I believe that this is what was meant.  (I 
know few people who have a separate system console anymore, so 
that meaning has rather dropped from my vocabulary [of course, 
I'm not the original poster, so I'm guessing what was meant].)
>...
>> 
>> No.  But perhaps a higher level description could be.  It
>> might not have the total functionality of low-level system
>> calls, but one often doesn't need that. (I have only used
>> VMS twice, so forgive me if I don't know what an ACE is.)
>
>By ACE I mean "Access Control Entry", the fundamental
>building block of an Access Control List.  I was under the
>impression the same term was used for Unix and Windows.  It
>is the most common method of complying with the C2 rules of
>the Orange Book. While various operating systems have Access
>Control Lists for file protection, the parsing rules differ
>from one OS to another.  Some early Unix implementations came
>without ACLs, but I think the need for C2 evaluation cured
>that for any serious implementations.
>
OK.  Then perhaps the difference is that I never work with 
highly secured systems.  Perhaps that *is* specialized enough 
(and different enough from system to system) that a high level 
specification would be inappropriate.  OTOH, if a similar 
construct is used on VMS, *nix, and Windows, then perhaps a high 
level description would be appropriate.

-- 
Charles Hixson

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