diff options
Diffstat (limited to 'gcc/ada/g-ctrl_c.ads')
| -rw-r--r-- | gcc/ada/g-ctrl_c.ads | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/gcc/ada/g-ctrl_c.ads b/gcc/ada/g-ctrl_c.ads new file mode 100644 index 00000000000..445653f8e9a --- /dev/null +++ b/gcc/ada/g-ctrl_c.ads @@ -0,0 +1,67 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |