Fix #10003. Add SIGBREAK to the set of valid signals on Windows.

This fixes a regression noticed by bzr, introduced by issue #9324.

Lib/test/test_signal.py

@@ -212,13 +212,13 @@ class BasicSignalTests(unittest.TestCase):
 @unittest.skipUnless(sys.platform == "win32", "Windows specific")
 class WindowsSignalTests(unittest.TestCase):
     def test_issue9324(self):
+        # Updated for issue #10003, adding SIGBREAK
         handler = lambda x, y: None
-        signal.signal(signal.SIGABRT, handler)
-        signal.signal(signal.SIGFPE, handler)
-        signal.signal(signal.SIGILL, handler)
-        signal.signal(signal.SIGINT, handler)
-        signal.signal(signal.SIGSEGV, handler)
-        signal.signal(signal.SIGTERM, handler)
+        for sig in (signal.SIGABRT, signal.SIGBREAK, signal.SIGFPE,
+                    signal.SIGILL, signal.SIGINT, signal.SIGSEGV,
+                    signal.SIGTERM):
+            # Set and then reset a handler for signals that work on windows
+            signal.signal(sig, signal.signal(sig, handler))
 
         with self.assertRaises(ValueError):
             signal.signal(-1, handler)

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.2 Alpha 3?
 Core and Builtins
 -----------------
 
+- Issue #10003: Allow handling of SIGBREAK on Windows. Fixes a regression
+  introduced by issue #9324. 
+
 - Issue #9979: Create function PyUnicode_AsWideCharString().
 
 - Issue #7397: Mention that importlib.import_module() is probably what someone

Modules/signalmodule.c

@@ -261,6 +261,11 @@ signal_signal(PyObject *self, PyObject *args)
     /* Validate that sig_num is one of the allowable signals */
     switch (sig_num) {
         case SIGABRT: break;
+#ifdef SIGBREAK
+        /* Issue #10003: SIGBREAK is not documented as permitted, but works
+           and corresponds to CTRL_BREAK_EVENT. */
+        case SIGBREAK: break;
+#endif
         case SIGFPE: break;
         case SIGILL: break;
         case SIGINT: break;