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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . C T R L _ C --
-- --
-- S p e c --
-- --
-- Copyright (C) 2002 Ada Core Technologies, Inc. --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
-- 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.
-- On most implementations, the interaction will be no different whether
-- tasking is involved or not. An exception is GNU/Linux systems where
-- each task/thread is considered as a separate process by the kernel,
-- meaning in particular that a Ctrl-C from the keyboard will be sent to
-- all tasks instead of only one, resulting in multiple calls to the handler.
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.
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, Install_Handler, "__gnat_install_int_handler");
pragma Import (C, Uninstall_Handler, "__gnat_uninstall_int_handler");
end GNAT.Ctrl_C;
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