Issue #8184: multiprocessing: On Windows, don't set SO_REUSEADDR on Connection

sockets, and set FILE_FLAG_FIRST_PIPE_INSTANCE on named pipes, to make sure two
listeners can't bind to the same socket/pipe (or any existing socket/pipe).

1 files changed, 12 insertions, 0 deletions

diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index e5beb97..f141bd4 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -1779,6 +1779,17 @@ class _TestConnection(BaseTestCase):
         self.assertRaises(RuntimeError, reduction.recv_handle, conn)
         p.join()
 
+class _TestListener(BaseTestCase):
+
+    ALLOWED_TYPES = ('processes')
+
+    def test_multiple_bind(self):
+        for family in self.connection.families:
+            l = self.connection.Listener(family=family)
+            self.addCleanup(l.close)
+            self.assertRaises(OSError, self.connection.Listener,
+                              l.address, family)
+
 class _TestListenerClient(BaseTestCase):
 
     ALLOWED_TYPES = ('processes', 'threads')
@@ -1799,6 +1810,7 @@ class _TestListenerClient(BaseTestCase):
             self.assertEqual(conn.recv(), 'hello')
             p.join()
             l.close()
+
 #
 # Test of sending connection and socket objects between processes
 #