/*************************************************************************** csignal.c (c) 2000-2011 Benoît Minisini This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT 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 along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. ***************************************************************************/ #define __CSIGNAL_C #include #include #include #include #include #include "main.h" #include "csignal.h" #ifndef SIGPOLL #define SIGPOLL SIGIO #endif #ifndef SIGPWR #define SIGPWR -1 #endif // The -1 signal is used for ignored signal numbers /*#define DEBUG*/ #define SIGNAL_MAX 31 typedef struct SIGNAL_HANDLER { struct SIGNAL_HANDLER *next; struct SIGNAL_HANDLER *prev; int num; bool catch; struct sigaction action; } SIGNAL_HANDLER; static int _signal = -1; static SIGNAL_HANDLER *_handlers = NULL; static bool _init_signal = FALSE; static int _num_signal_watch = 0; static int _pipe_signal[2]; static GB_FUNCTION _application_signal_func; static void callback_signal(int fd, int type, void *data) { char num; fprintf(stderr, "callback_signal\n"); if (read(fd, &num, 1) != 1) return; GB.Push(1, GB_T_INTEGER, num); GB.Call(&_application_signal_func, 1, TRUE); } static void init_signal(void) { _num_signal_watch++; if (_num_signal_watch > 1) return; if (GB.GetFunction(&_application_signal_func, (void *)GB.Application.StartupClass(), "Application_Signal", "i", "")) { GB.Error("No Application_Signal event handler defined in startup class"); return; } if (pipe(_pipe_signal) != 0) { GB.Error("Cannot create signal handler pipes"); return; } fcntl(_pipe_signal[0], F_SETFD, FD_CLOEXEC); fcntl(_pipe_signal[1], F_SETFD, FD_CLOEXEC); GB.Watch(_pipe_signal[0], GB_WATCH_READ, (void *)callback_signal, 0); _init_signal = TRUE; } static void exit_signal(void) { if (_num_signal_watch <= 0) return; _num_signal_watch--; if (_num_signal_watch) return; GB.Watch(_pipe_signal[0], GB_WATCH_NONE, NULL, 0); close(_pipe_signal[0]); close(_pipe_signal[1]); _init_signal = FALSE; } static SIGNAL_HANDLER *find_handler(int num) { SIGNAL_HANDLER *sh; sh = _handlers; while (sh) { if (sh->num == num) return sh; sh = sh->next; } return NULL; } static void remove_handler(SIGNAL_HANDLER *handler) { if (handler->prev) handler->prev->next = handler->next; if (handler->next) handler->next->prev = handler->prev; if (handler == _handlers) _handlers = handler->next; if (handler->catch) exit_signal(); GB.Free(POINTER(&handler)); } static void add_handler(int num, struct sigaction *action) { SIGNAL_HANDLER *sh; sh = find_handler(num); if (sh) { sigaction(num, action, NULL); return; } GB.Alloc(POINTER(&sh), sizeof(SIGNAL_HANDLER)); sh->num = num; sh->next = _handlers; sh->prev = NULL; _handlers = sh; sh->catch = (action->sa_flags & SA_SIGINFO) != 0; if (sh->catch) init_signal(); if (sigaction(num, action, &sh->action)) { GB.Error("Unable to modify signal handler"); exit_signal(); return; } } static void handle_signal(int num, struct siginfo *info, void *context) { char cnum = (char)num; if (write(_pipe_signal[1], &cnum, 1) != 1) return; } BEGIN_METHOD_VOID(Signal_Reset) SIGNAL_HANDLER *sh; if (_signal < 0) return; sh = find_handler(_signal); if (!sh) return; if (sigaction(_signal, &sh->action, NULL)) { GB.Error("Unable to reset signal handler"); return; } remove_handler(sh); END_METHOD BEGIN_METHOD_VOID(Signal_Ignore) struct sigaction action; if (_signal < 0) return; action.sa_handler = SIG_IGN; sigemptyset(&action.sa_mask); action.sa_flags = 0; add_handler(_signal, &action); END_METHOD BEGIN_METHOD_VOID(Signal_Catch) struct sigaction action; if (_signal < 0) return; action.sa_sigaction = handle_signal; sigemptyset(&action.sa_mask); action.sa_flags = SA_SIGINFO; add_handler(_signal, &action); END_METHOD BEGIN_METHOD(Signal_get, GB_INTEGER num) int num = VARG(num); if (num < -1 || num > SIGNAL_MAX) { GB.Error("Bad signal number"); return; } _signal = num; RETURN_SELF(); END_METHOD BEGIN_METHOD_VOID(Signal_exit) exit_signal(); while (_handlers) remove_handler(_handlers); END_METHOD GB_DESC CSignalHandlerDesc[] = { GB_DECLARE(".SignalHandler", 0), GB_VIRTUAL_CLASS(), GB_STATIC_METHOD("Reset", NULL, Signal_Reset, NULL), GB_STATIC_METHOD("Ignore", NULL, Signal_Ignore, NULL), GB_STATIC_METHOD("Catch", NULL, Signal_Catch, NULL), GB_END_DECLARE }; GB_DESC CSignalDesc[] = { GB_DECLARE("Signal", 0), GB_VIRTUAL_CLASS(), GB_CONSTANT("SIGHUP", "i", SIGHUP), GB_CONSTANT("SIGINT", "i", SIGINT), GB_CONSTANT("SIGQUIT", "i", SIGQUIT), GB_CONSTANT("SIGILL", "i", SIGILL), GB_CONSTANT("SIGTRAP", "i", SIGTRAP), GB_CONSTANT("SIGABRT", "i", SIGABRT), GB_CONSTANT("SIGIOT", "i", SIGIOT), GB_CONSTANT("SIGBUS", "i", SIGBUS), GB_CONSTANT("SIGFPE", "i", SIGFPE), GB_CONSTANT("SIGKILL", "i", SIGKILL), GB_CONSTANT("SIGUSR1", "i", SIGUSR1), GB_CONSTANT("SIGSEGV", "i", SIGSEGV), GB_CONSTANT("SIGUSR2", "i", SIGUSR2), GB_CONSTANT("SIGPIPE", "i", SIGPIPE), GB_CONSTANT("SIGALRM", "i", SIGALRM), GB_CONSTANT("SIGTERM", "i", SIGTERM), //GB_CONSTANT("SIGSTKFLT", "i", SIGSTKFLT), //GB_CONSTANT("SIGCLD", "i", SIGCLD), GB_CONSTANT("SIGCHLD", "i", SIGCHLD), GB_CONSTANT("SIGCONT", "i", SIGCONT), GB_CONSTANT("SIGSTOP", "i", SIGSTOP), GB_CONSTANT("SIGTSTP", "i", SIGTSTP), GB_CONSTANT("SIGTTIN", "i", SIGTTIN), GB_CONSTANT("SIGTTOU", "i", SIGTTOU), GB_CONSTANT("SIGURG", "i", SIGURG), GB_CONSTANT("SIGXCPU", "i", SIGXCPU), GB_CONSTANT("SIGXFSZ", "i", SIGXFSZ), GB_CONSTANT("SIGVTALRM", "i", SIGVTALRM), GB_CONSTANT("SIGPROF", "i", SIGPROF), GB_CONSTANT("SIGWINCH", "i", SIGWINCH), GB_CONSTANT("SIGPOLL", "i", SIGPOLL), GB_CONSTANT("SIGIO", "i", SIGIO), GB_CONSTANT("SIGPWR", "i", SIGPWR), GB_CONSTANT("SIGSYS", "i", SIGSYS), GB_STATIC_METHOD("_exit", NULL, Signal_exit, NULL), GB_STATIC_METHOD("_get", ".SignalHandler", Signal_get, "(Signal)i"), GB_END_DECLARE };