--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/g-ctrl_c.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,59 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                          G N A T . C T R L _ C                           --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                      Copyright (C) 2002-2017, 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 3,  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.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  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;