signalmodule.c

python s60 1.4.5版本的源代码

                goto finally;

	x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN);
        if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0)
                goto finally;

        x = PyInt_FromLong((long)NSIG);
        if (!x || PyDict_SetItemString(d, "NSIG", x) < 0)
                goto finally;
        Py_DECREF(x);

	x = IntHandler = PyDict_GetItemString(d, "default_int_handler");
        if (!x)
                goto finally;
	Py_INCREF(IntHandler);

	Handlers[0].tripped = 0;
	for (i = 1; i < NSIG; i++) {
		void (*t)(int);
		t = PyOS_getsig(i);
		Handlers[i].tripped = 0;
		if (t == SIG_DFL)
			Handlers[i].func = DefaultHandler;
		else if (t == SIG_IGN)
			Handlers[i].func = IgnoreHandler;
		else
			Handlers[i].func = Py_None; /* None of our business */
		Py_INCREF(Handlers[i].func);
	}
	if (Handlers[SIGINT].func == DefaultHandler) {
		/* Install default int handler */
		Py_INCREF(IntHandler);
		Py_DECREF(Handlers[SIGINT].func);
		Handlers[SIGINT].func = IntHandler;
		old_siginthandler = PyOS_setsig(SIGINT, signal_handler);
	}

#ifdef SIGHUP
	x = PyInt_FromLong(SIGHUP);
	PyDict_SetItemString(d, "SIGHUP", x);
        Py_XDECREF(x);
#endif
#ifdef SIGINT
	x = PyInt_FromLong(SIGINT);
	PyDict_SetItemString(d, "SIGINT", x);
        Py_XDECREF(x);
#endif
#ifdef SIGBREAK
	x = PyInt_FromLong(SIGBREAK);
	PyDict_SetItemString(d, "SIGBREAK", x);
        Py_XDECREF(x);
#endif
#ifdef SIGQUIT
	x = PyInt_FromLong(SIGQUIT);
	PyDict_SetItemString(d, "SIGQUIT", x);
        Py_XDECREF(x);
#endif
#ifdef SIGILL
	x = PyInt_FromLong(SIGILL);
	PyDict_SetItemString(d, "SIGILL", x);
        Py_XDECREF(x);
#endif
#ifdef SIGTRAP
	x = PyInt_FromLong(SIGTRAP);
	PyDict_SetItemString(d, "SIGTRAP", x);
        Py_XDECREF(x);
#endif
#ifdef SIGIOT
	x = PyInt_FromLong(SIGIOT);
	PyDict_SetItemString(d, "SIGIOT", x);
        Py_XDECREF(x);
#endif
#ifdef SIGABRT
	x = PyInt_FromLong(SIGABRT);
	PyDict_SetItemString(d, "SIGABRT", x);
        Py_XDECREF(x);
#endif
#ifdef SIGEMT
	x = PyInt_FromLong(SIGEMT);
	PyDict_SetItemString(d, "SIGEMT", x);
        Py_XDECREF(x);
#endif
#ifdef SIGFPE
	x = PyInt_FromLong(SIGFPE);
	PyDict_SetItemString(d, "SIGFPE", x);
        Py_XDECREF(x);
#endif
#ifdef SIGKILL
	x = PyInt_FromLong(SIGKILL);
	PyDict_SetItemString(d, "SIGKILL", x);
        Py_XDECREF(x);
#endif
#ifdef SIGBUS
	x = PyInt_FromLong(SIGBUS);
	PyDict_SetItemString(d, "SIGBUS", x);
        Py_XDECREF(x);
#endif
#ifdef SIGSEGV
	x = PyInt_FromLong(SIGSEGV);
	PyDict_SetItemString(d, "SIGSEGV", x);
        Py_XDECREF(x);
#endif
#ifdef SIGSYS
	x = PyInt_FromLong(SIGSYS);
	PyDict_SetItemString(d, "SIGSYS", x);
        Py_XDECREF(x);
#endif
#ifdef SIGPIPE
	x = PyInt_FromLong(SIGPIPE);
	PyDict_SetItemString(d, "SIGPIPE", x);
        Py_XDECREF(x);
#endif
#ifdef SIGALRM
	x = PyInt_FromLong(SIGALRM);
	PyDict_SetItemString(d, "SIGALRM", x);
        Py_XDECREF(x);
#endif
#ifdef SIGTERM
	x = PyInt_FromLong(SIGTERM);
	PyDict_SetItemString(d, "SIGTERM", x);
        Py_XDECREF(x);
#endif
#ifdef SIGUSR1
	x = PyInt_FromLong(SIGUSR1);
	PyDict_SetItemString(d, "SIGUSR1", x);
        Py_XDECREF(x);
#endif
#ifdef SIGUSR2
	x = PyInt_FromLong(SIGUSR2);
	PyDict_SetItemString(d, "SIGUSR2", x);
        Py_XDECREF(x);
#endif
#ifdef SIGCLD
	x = PyInt_FromLong(SIGCLD);
	PyDict_SetItemString(d, "SIGCLD", x);
        Py_XDECREF(x);
#endif
#ifdef SIGCHLD
	x = PyInt_FromLong(SIGCHLD);
	PyDict_SetItemString(d, "SIGCHLD", x);
        Py_XDECREF(x);
#endif
#ifdef SIGPWR
	x = PyInt_FromLong(SIGPWR);
	PyDict_SetItemString(d, "SIGPWR", x);
        Py_XDECREF(x);
#endif
#ifdef SIGIO
	x = PyInt_FromLong(SIGIO);
	PyDict_SetItemString(d, "SIGIO", x);
        Py_XDECREF(x);
#endif
#ifdef SIGURG
	x = PyInt_FromLong(SIGURG);
	PyDict_SetItemString(d, "SIGURG", x);
        Py_XDECREF(x);
#endif
#ifdef SIGWINCH
	x = PyInt_FromLong(SIGWINCH);
	PyDict_SetItemString(d, "SIGWINCH", x);
        Py_XDECREF(x);
#endif
#ifdef SIGPOLL
	x = PyInt_FromLong(SIGPOLL);
	PyDict_SetItemString(d, "SIGPOLL", x);
        Py_XDECREF(x);
#endif
#ifdef SIGSTOP
	x = PyInt_FromLong(SIGSTOP);
	PyDict_SetItemString(d, "SIGSTOP", x);
        Py_XDECREF(x);
#endif
#ifdef SIGTSTP
	x = PyInt_FromLong(SIGTSTP);
	PyDict_SetItemString(d, "SIGTSTP", x);
        Py_XDECREF(x);
#endif
#ifdef SIGCONT
	x = PyInt_FromLong(SIGCONT);
	PyDict_SetItemString(d, "SIGCONT", x);
        Py_XDECREF(x);
#endif
#ifdef SIGTTIN
	x = PyInt_FromLong(SIGTTIN);
	PyDict_SetItemString(d, "SIGTTIN", x);
        Py_XDECREF(x);
#endif
#ifdef SIGTTOU
	x = PyInt_FromLong(SIGTTOU);
	PyDict_SetItemString(d, "SIGTTOU", x);
        Py_XDECREF(x);
#endif
#ifdef SIGVTALRM
	x = PyInt_FromLong(SIGVTALRM);
	PyDict_SetItemString(d, "SIGVTALRM", x);
        Py_XDECREF(x);
#endif
#ifdef SIGPROF
	x = PyInt_FromLong(SIGPROF);
	PyDict_SetItemString(d, "SIGPROF", x);
        Py_XDECREF(x);
#endif
#ifdef SIGXCPU
	x = PyInt_FromLong(SIGXCPU);
	PyDict_SetItemString(d, "SIGXCPU", x);
        Py_XDECREF(x);
#endif
#ifdef SIGXFSZ
	x = PyInt_FromLong(SIGXFSZ);
	PyDict_SetItemString(d, "SIGXFSZ", x);
        Py_XDECREF(x);
#endif
        if (!PyErr_Occurred())
                return;

	/* Check for errors */
  finally:
        return;
}

static void
finisignal(void)
{
	int i;
	PyObject *func;

	PyOS_setsig(SIGINT, old_siginthandler);
	old_siginthandler = SIG_DFL;

	for (i = 1; i < NSIG; i++) {
		func = Handlers[i].func;
		Handlers[i].tripped = 0;
		Handlers[i].func = NULL;
		if (i != SIGINT && func != NULL && func != Py_None &&
		    func != DefaultHandler && func != IgnoreHandler)
			PyOS_setsig(i, SIG_DFL);
		Py_XDECREF(func);
	}

	Py_XDECREF(IntHandler);
	IntHandler = NULL;
	Py_XDECREF(DefaultHandler);
	DefaultHandler = NULL;
	Py_XDECREF(IgnoreHandler);
	IgnoreHandler = NULL;
}


/* Declared in pyerrors.h */
int
PyErr_CheckSignals(void)
{
	int i;
	PyObject *f;

	if (!is_tripped)
		return 0;
#ifdef WITH_THREAD
	if (PyThread_get_thread_ident() != main_thread)
		return 0;
#endif
	if (!(f = PyEval_GetFrame()))
		f = Py_None;
	
	for (i = 1; i < NSIG; i++) {
		if (Handlers[i].tripped) {
			PyObject *result = NULL;
			PyObject *arglist = Py_BuildValue("(iO)", i, f);
			Handlers[i].tripped = 0;

			if (arglist) {
				result = PyEval_CallObject(Handlers[i].func,
							   arglist);
				Py_DECREF(arglist);
			}
			if (!result)
				return -1;

			Py_DECREF(result);
		}
	}
	is_tripped = 0;
	return 0;
}


/* Replacements for intrcheck.c functionality
 * Declared in pyerrors.h
 */
void
PyErr_SetInterrupt(void)
{
	is_tripped++;
	Handlers[SIGINT].tripped = 1;
	Py_AddPendingCall((int (*)(void *))PyErr_CheckSignals, NULL);
}

void
PyOS_InitInterrupts(void)
{
	initsignal();
	_PyImport_FixupExtension("signal", "signal");
}

void
PyOS_FiniInterrupts(void)
{
	finisignal();
}

int
PyOS_InterruptOccurred(void)
{
	if (Handlers[SIGINT].tripped) {
#ifdef WITH_THREAD
		if (PyThread_get_thread_ident() != main_thread)
			return 0;
#endif
		Handlers[SIGINT].tripped = 0;
		return 1;
	}
	return 0;
}

void
PyOS_AfterFork(void)
{
#ifdef WITH_THREAD
	PyEval_ReInitThreads();
	main_thread = PyThread_get_thread_ident();
	main_pid = getpid();
#endif
}