| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- G N A T . C T R L _ C -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2002-2006, 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- 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, 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, Install_Handler, "__gnat_install_int_handler"); |
| pragma Import (C, Uninstall_Handler, "__gnat_uninstall_int_handler"); |
| end GNAT.Ctrl_C; |
