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Diffstat (limited to 'gcc-4.9/gcc/ada/ctrl_c.c')
-rw-r--r-- | gcc-4.9/gcc/ada/ctrl_c.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/ada/ctrl_c.c b/gcc-4.9/gcc/ada/ctrl_c.c new file mode 100644 index 000000000..7f8d177d1 --- /dev/null +++ b/gcc-4.9/gcc/ada/ctrl_c.c @@ -0,0 +1,192 @@ +/**************************************************************************** + * * + * GNAT COMPILER COMPONENTS * + * * + * C T R L _ C * + * * + * C Implementation File * + * * + * Copyright (C) 2002-2013, 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) + /* LynxOS and VMS 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 |