Further ANSIfication of functionpointers and declarations. Also, make sure

to return something if RETSIGTYPE isn't void, in functions that are defined
to return RETSIGTYPE. Work around an argumentlist mismatch ('void' vs.
'void *') by using a static wrapper function.

Modules/signalmodule.c

@@ -26,7 +26,7 @@ redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 #include <signal.h>
 
 #ifndef SIG_ERR
-#define SIG_ERR ((RETSIGTYPE (*)())-1)
+#define SIG_ERR ((RETSIGTYPE (*)(int))-1)
 #endif
 
 #if defined(PYOS_OS2)
@@ -92,7 +92,7 @@ static PyObject *DefaultHandler;
 static PyObject *IgnoreHandler;
 static PyObject *IntHandler;
 
-static RETSIGTYPE (*old_siginthandler)() = SIG_DFL;
+static RETSIGTYPE (*old_siginthandler)(int) = SIG_DFL;
 
 
 
@@ -110,6 +110,13 @@ The default handler for SIGINT instated by Python.\n\
 It raises KeyboardInterrupt.";
 
 
+
+static int
+checksignals_witharg(void * unused)
+{
+	return PyErr_CheckSignals();
+}
+
 static RETSIGTYPE
 signal_handler(int sig_num)
 {
@@ -119,8 +126,7 @@ signal_handler(int sig_num)
 #endif
 		is_tripped++;
 		Handlers[sig_num].tripped = 1;
-		Py_AddPendingCall(
-			(int (*)(ANY *))PyErr_CheckSignals, NULL);
+		Py_AddPendingCall(checksignals_witharg, NULL);
 #ifdef WITH_THREAD
 	}
 #endif
@@ -136,7 +142,10 @@ signal_handler(int sig_num)
 #ifdef HAVE_SIGINTERRUPT
 	siginterrupt(sig_num, 1);
 #endif
-	(void)signal(sig_num, &signal_handler);
+	signal(sig_num, signal_handler);
+#if RETSIGTYPE != void
+	return 0;
+#endif
 }
 
 
@@ -191,7 +200,7 @@ signal_signal(PyObject *self, PyObject *args)
 	PyObject *obj;
 	int sig_num;
 	PyObject *old_handler;
-	RETSIGTYPE (*func)();
+	RETSIGTYPE (*func)(int);
 	if (!PyArg_Parse(args, "(iO)", &sig_num, &obj))
 		return NULL;
 #ifdef WITH_THREAD
@@ -348,7 +357,7 @@ initsignal(void)
 
 	Handlers[0].tripped = 0;
 	for (i = 1; i < NSIG; i++) {
-		RETSIGTYPE (*t)();
+		RETSIGTYPE (*t)(int);
 #ifdef HAVE_SIGACTION
 		struct sigaction act;
 		sigaction(i,  0, &act);