1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                          G N A T . C T R L _ C                           --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--                      Copyright (C) 2002-2010, AdaCore                    --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This package may be used to intercept the interruption of a running
33--  program by the operator typing Control-C, without having to use an Ada
34--  interrupt handler protected object.
35
36--  This package is currently implemented under Windows and Unix platforms
37
38--  Note concerning Unix systems:
39
40--  The behavior of this package when using tasking depends on the interaction
41--  between sigaction() and the thread library.
42
43package GNAT.Ctrl_C is
44
45   type Handler_Type is access procedure;
46   --  Any parameterless library level procedure can be used as a handler.
47   --  Handler_Type should not propagate exceptions.
48
49   procedure Install_Handler (Handler : Handler_Type);
50   --  Set up Handler to be called if the operator hits Ctrl-C, instead of the
51   --  standard Control-C handler.
52
53   procedure Uninstall_Handler;
54   --  Reinstall the standard Control-C handler.
55   --  If Install_Handler has never been called, this procedure has no effect.
56
57private
58   pragma Import (C, Uninstall_Handler, "__gnat_uninstall_int_handler");
59end GNAT.Ctrl_C;
60