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From: "Steve" <nospam_steved94@comcast.net>
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 <87mzldf7rm.fsf@code-hal.de>
Subject: Re: How to detect OS type and version?
Date: Thu, 13 Oct 2005 18:33:42 -0700
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Date: 2005-10-13T18:33:42-07:00
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"Michael Bode" <m.g.bode@web.de> wrote in message 
news:87mzldf7rm.fsf@code-hal.de...
> Martin Dowie <martin.dowie@btopenworld.com> writes:
>
>> Roger Blum wrote:
>>> Is there a way within Ada (GNAT 3.15p) to tell whether the
>>> application is running on Linux or Windows (and the version of the
>>> OS)?
>>
>> There is no single standard why... yet!
>>
>> I think that you will be able to do this with "package
>> Ada.Environment_Variables" come Ada200Y, e.g.
>>
>> if Ada.Environment_Variables.Exists ("OS")
>>     and Ada.Environment_Variables.Value ("OS") = "Windows_NT" then
>>     ...
>> elsif Ada.Environment_Variables.Exists ("OSTYPE")
>
> He could use GNAT.Os_Lib.Getenv ("OSTYPE")
>
> -- 
> Michael Bode

In the implementation of GNAT.OS_Lib there is an interesting definition:

   On_Windows : constant Boolean := Directory_Separator = '\';

Apparently that's how GNAT finds the OS.

Once you have the OS, you can use OS specific code to find the version.

Steve
(The Duck)