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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                          G N A T . C T R L _ C                           --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--                      Copyright (C) 2002-2007, AdaCore                    --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT 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  distributed with GNAT;  see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  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  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package may be used to intercept the interruption of a running

--  program by the operator typing Control-C, without having to use an Ada

--  interrupt handler protected object.

--  This package is currently implemented under Windows and Unix platforms

--  Note concerning Unix systems:

--  The behavior of this package when using tasking depends on the interaction

--  between sigaction() and the thread library.

package GNAT.Ctrl_C is

   type Handler_Type is access procedure;

   --  Any parameterless library level procedure can be used as a handler.

   --  Handler_Type should not propagate exceptions.

   procedure Install_Handler (Handler : Handler_Type);

   --  Set up Handler to be called if the operator hits Ctrl-C, instead of the

   --  standard Control-C handler.

   procedure Uninstall_Handler;

   --  Reinstall the standard Control-C handler.

   --  If Install_Handler has never been called, this procedure has no effect.

private

   pragma Import (C, Uninstall_Handler, "__gnat_uninstall_int_handler");

end GNAT.Ctrl_C;