Package: Util.Execution

Description

Copyright © 2001, 2002 by Thomas Wolf.
This piece of software is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This software is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License with this distribution, see file "GPL.txt". If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
As a special exception from the GPL, if other files instantiate generics from this unit, or you link this unit with other files to produce an executable, this unit does not by itself cause the resulting executable to be covered by the GPL. This exception does not however invalidate any other reasons why the executable file might be covered by the GPL.

Version: 1.1

Author:
Thomas Wolf (TW) <twolf AT acm DOT org>
Purpose:
Simple operations to execute a command in the OS environment. Implemented by calling the ISO-C standard function "system".

Both versions of Execute should be considered potentially blocking calls.

Also provided is an interface to the ISO C standard function "exit", which should kill the process.

Tasking Semantics
Neither task- nor abortion-safe.
Storage Semantics
No dynamic storage allocation.

Header

package Util.Execution is
 
pragma Elaborate_Body;

Other Items:

function Execute (Command : in String) return Integer;
Return whatever the underlying "system" returns. The semantics of this return value is completely implementation-defined (in the ISO C standard). However, typical implementations return zero upon success, and a non-zero value upon failure.

procedure Execute (Command : in String);
Use this if you don't care about the return value of "system".

procedure Terminate_Process
  (Status : in Integer := 0);
ISO C's exit function.
end Util.Execution;