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From: "Dmitriy Anisimkov" <anisimkov@yahoo.com>
Newsgroups: comp.lang.ada
Subject: Re: How do I end the program?
Date: Tue, 5 Feb 2002 13:39:56 +0600
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> > GNAT.OS_Lib.OS_Exit. Is there a pure Ada alternative?
>
> No not really. One way of doing it is to define an exception...
>
>    Quit_Program : Exception;
>
> then have a handler at the main program level....
>
>    exception
>       when Quit_Program => null;
>    end;
>
> Before you do that you can call Ada.Command_Line.Set_Exit_Status.

You could not terminate programm this way from task.
But the GNAT.OS_Lib.OS_Exit could.