------------------------------------------------------------------------------ -- -- -- 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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;