| /**************************************************************************** |
| * * |
| * GNAT COMPILER COMPONENTS * |
| * * |
| * C T R L _ C * |
| * * |
| * C Implementation File * |
| * * |
| * Copyright (C) 2002-2019, Free Software Foundation, 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 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. * |
| * * |
| ****************************************************************************/ |
| |
| #ifdef IN_RTS |
| #include "tconfig.h" |
| #include "tsystem.h" |
| #include <sys/stat.h> |
| #else |
| #include "config.h" |
| #include "system.h" |
| #endif |
| |
| /* Services to intercept Ctrl-C */ |
| |
| /* __gnat_install_int_handler will install the specified handler. |
| If called for the first time, it will also save the original handler */ |
| void __gnat_install_int_handler (void (*) (void)); |
| |
| /* __gnat_uninstall_int_handler will reinstall the original handler */ |
| void __gnat_uninstall_int_handler (void); |
| |
| /* POSIX implementation */ |
| |
| #if (defined (__unix__) || defined (_AIX) || defined (__APPLE__)) \ |
| || defined (VMS) && !defined (__vxworks) |
| |
| #ifdef VMS |
| /* On VMS _gnat_handle_vms_condition gets control first, and it has to |
| resignal the Ctrl/C in order for sigaction to gain control and execute |
| the user handler routine, but in doing so propagates the condition |
| causing the program to terminate. So instead we install a dummy handler |
| routine and put the real user handler in a special global variable so |
| that __gnat_handle_vms_condition can declare an AST to asynchronously |
| execute the Ctrl/C user handler at some future time and allow |
| __gnat_handle_vms_condition to return and not be held up waiting for |
| the potentially unbounded time required to execute the Crtl/C handler. */ |
| void |
| dummy_handler () {} |
| |
| /* Lives in init.c. */ |
| extern void (*__gnat_ctrl_c_handler) (void); |
| #endif |
| |
| #include <signal.h> |
| |
| void (*sigint_intercepted) (void) = 0; |
| |
| struct sigaction original_act; |
| |
| static void |
| __gnat_int_handler (int sig __attribute__ ((unused))) |
| { |
| if (sigint_intercepted != 0) |
| sigint_intercepted (); |
| } |
| |
| /* Install handler and save original handler. */ |
| |
| void |
| __gnat_install_int_handler (void (*proc) (void)) |
| { |
| struct sigaction act; |
| |
| if (sigint_intercepted == 0) |
| { |
| act.sa_handler = __gnat_int_handler; |
| #if defined (__Lynx__) || defined (VMS) || defined(__DJGPP__) |
| /* LynxOS, VMS and DJGPP do not support SA_RESTART. */ |
| act.sa_flags = 0; |
| #else |
| act.sa_flags = SA_RESTART; |
| #endif |
| sigemptyset (&act.sa_mask); |
| sigaction (SIGINT, &act, &original_act); |
| } |
| |
| #ifdef VMS |
| sigint_intercepted = &dummy_handler; |
| __gnat_ctrl_c_handler = proc; |
| #else |
| sigint_intercepted = proc; |
| #endif |
| } |
| |
| /* Restore original handler */ |
| |
| void |
| __gnat_uninstall_int_handler (void) |
| { |
| if (sigint_intercepted != 0) |
| { |
| sigaction (SIGINT, &original_act, 0); |
| sigint_intercepted = 0; |
| } |
| #ifdef VMS |
| if (__gnat_ctrl_c_handler) |
| __gnat_ctrl_c_handler = 0; |
| #endif |
| } |
| |
| /* Windows implementation */ |
| |
| #elif defined (__MINGW32__) |
| |
| #include "mingw32.h" |
| #include <windows.h> |
| |
| void (*sigint_intercepted) (void) = NULL; |
| |
| static BOOL WINAPI |
| __gnat_int_handler (DWORD dwCtrlType) |
| { |
| switch (dwCtrlType) |
| { |
| case CTRL_C_EVENT: |
| case CTRL_BREAK_EVENT: |
| if (sigint_intercepted != 0) |
| { |
| sigint_intercepted (); |
| return TRUE; |
| } |
| break; |
| |
| case CTRL_CLOSE_EVENT: |
| case CTRL_LOGOFF_EVENT: |
| case CTRL_SHUTDOWN_EVENT: |
| break; |
| } |
| |
| return FALSE; |
| } |
| |
| void |
| __gnat_install_int_handler (void (*proc) (void)) |
| { |
| if (sigint_intercepted == NULL) |
| SetConsoleCtrlHandler (__gnat_int_handler, TRUE); |
| |
| sigint_intercepted = proc; |
| } |
| |
| void |
| __gnat_uninstall_int_handler (void) |
| { |
| if (sigint_intercepted != NULL) |
| SetConsoleCtrlHandler (__gnat_int_handler, FALSE); |
| |
| sigint_intercepted = NULL; |
| } |
| |
| /* Default implementation: do nothing */ |
| |
| #else |
| |
| void |
| __gnat_install_int_handler (void (*proc) (void) __attribute__ ((unused))) |
| { |
| } |
| |
| void |
| __gnat_uninstall_int_handler (void) |
| { |
| } |
| #endif |