Issue #14482: Raise a ValueError, not a NameError, when trying to create

a multiprocessing Client or Listener with an AF_UNIX type address under
Windows.  Patch by Popa Claudiu.

Lib/multiprocessing/connection.py

@@ -111,6 +111,10 @@ def _validate_family(family):
     if sys.platform != 'win32' and family == 'AF_PIPE':
         raise ValueError('Family %s is not recognized.' % family)
 
+    if sys.platform == 'win32' and family == 'AF_UNIX':
+        # double check
+        if not hasattr(socket, family):
+            raise ValueError('Family %s is not recognized.' % family)
 
 def address_type(address):
     '''

Lib/test/test_multiprocessing.py

@@ -2649,6 +2649,10 @@ class TestInvalidFamily(unittest.TestCase):
         with self.assertRaises(ValueError):
             multiprocessing.connection.Listener(r'\\.\test')
 
+    @unittest.skipUnless(WIN32, "skipped on non-Windows platforms")
+    def test_invalid_family_win32(self):
+        with self.assertRaises(ValueError):
+            multiprocessing.connection.Listener('/var/test.pipe')
 
 testcases_other = [OtherTest, TestInvalidHandle, TestInitializers,
                    TestStdinBadfiledescriptor, TestWait, TestInvalidFamily]

Misc/NEWS

@@ -19,6 +19,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #14482: Raise a ValueError, not a NameError, when trying to create
+  a multiprocessing Client or Listener with an AF_UNIX type address under
+  Windows.  Patch by Popa Claudiu.
+
 - Issue #802310: Generate always unique tkinter font names if not directly passed.
 
 - Issue #14151: Raise a ValueError, not a NameError, when trying to create