python · zooba · Jun 5, 2017 · Jun 2, 2017 · Jun 5, 2017 · Jun 5, 2017
diff --git a/Lib/test/test_faulthandler.py b/Lib/test/test_faulthandler.py
@@ -754,6 +754,32 @@ def test_raise_exception(self):
                3,
                name)

+    @unittest.skipUnless(MS_WINDOWS, 'specific to Windows')
+    def test_raise_nonfatal_exception(self):
+        # These exceptions are not strictly errors. Letting
+        # faulthandler display the traceback when they are
+        # raised is likely to result in noise. However, they
+        # may still terminate the process if there is no
+        # handler installed for them (which there typically
+        # is, e.g. for debug messages).
+        for exc in (
+            0x00000000,
+            0x34567890,
+            0x40000000,
+            0x40001000,
+            0x70000000,
+            0x7FFFFFFF,
+        ):
+            output, exitcode = self.get_output(f"""
+                import faulthandler
+                faulthandler.enable()
+                faulthandler._raise_exception(0x{exc:x})
+                """
+            )
+            self.assertEqual(output, [])
+            # Actual exception code has bit 4 cleared
+            self.assertEqual(exitcode, exc & ~0x10000000)
+
    @unittest.skipUnless(MS_WINDOWS, 'specific to Windows')
    def test_disable_windows_exc_handler(self):
        code = dedent("""

diff --git a/Misc/NEWS b/Misc/NEWS
@@ -345,6 +345,9 @@ Extension Modules
 Library
 -------

+- bpo-30557: faulthandler now correctly filters and displays exception codes
+  on Windows
+
 - bpo-30526: Add TextIOWrapper.reconfigure() and a TextIOWrapper.write_through
  attribute.


diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
@@ -373,8 +373,8 @@ faulthandler_exc_handler(struct _EXCEPTION_POINTERS *exc_info)
    DWORD code = exc_info->ExceptionRecord->ExceptionCode;
    DWORD flags = exc_info->ExceptionRecord->ExceptionFlags;

-    /* only log fatal exceptions */
-    if (flags & EXCEPTION_NONCONTINUABLE) {
+    /* bpo-30557: only log fatal exceptions */
+    if (!(code & 0x80000000)) {
        /* call the next exception handler */
        return EXCEPTION_CONTINUE_SEARCH;
    }
@@ -391,8 +391,8 @@ faulthandler_exc_handler(struct _EXCEPTION_POINTERS *exc_info)
    case EXCEPTION_IN_PAGE_ERROR: PUTS(fd, "page error"); break;
    case EXCEPTION_STACK_OVERFLOW: PUTS(fd, "stack overflow"); break;
    default:
-        PUTS(fd, "code ");
-        _Py_DumpDecimal(fd, code);
+        PUTS(fd, "code 0x");
+        _Py_DumpHexadecimal(fd, code, 8);
    }
    PUTS(fd, "\n\n");