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From: do_while@ridgecrest.ca.us (Do-While Jones)
Subject: Re: [Q] Operating System Command Interface
Date: 1998/05/05
Message-ID: <6in63v$rd2$1@owens.ridgecrest.ca.us>#1/1
X-Deja-AN: 350439682
References: <6ims5j$1vo@gcsin3.geccs.gecm.com>
Organization: RidgeNet - SLIP/PPP Internet, Ridgecrest, CA. (760) 371-3501
Newsgroups: comp.lang.ada
Date: 1998-05-05T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <6ims5j$1vo@gcsin3.geccs.gecm.com>,
John McCabe  <john@nospam.assen.demon.co.uk> wrote:
>Am I right in thinking that, as standard, Ada has no direct perating 
>system command interface akin to the C "System" call?

Yes, because there is no standard operating system interface.  Of course
you can always call the C "system" call from Ada, but it is just as
unpredictable in Ada as it is in C.  The Ada code to call "system" is in
the recent thread called "Program (not task) Activation". 

I took the discussion about the inconsistent behavior of C's "system" 
call to comp.lang.c, and several Windows 95-related discussion groups a
couple weeks ago.  I got only one response.  That person quoted chapter
and verse explaining why Windows 95 does not have to return an error code
if the "system" call fails.  He suggested I take the matter up with Bill
myself.  It didn't seem to bother any of the C programmers that "system" 
on Windows NT works like "system" on UNIX, but "system" on Windows 95
doesn't.  I wonder what "system" will do on Windows 98.

Do-While Jones

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