The C function used by uuid.uuid4 is broken on

OSX 10.6 in that after os.fork() the parent and
child generate the same sequence of UUIDs.

This patch falls back to the the Python implementation
on OSX 10.6 or later.

Fixes issue #8621.

Lib/test/test_uuid.py

@@ -446,6 +446,34 @@ class TestUUID(TestCase):
             equal(u, uuid.UUID(v))
             equal(str(u), v)
 
+    def testIssue8621(self):
+        import os
+        import sys
+        if os.name != 'posix':
+            return
+
+        # On at least some versions of OSX uuid.uuid4 generates
+        # the same sequence of UUIDs in the parent and any
+        # children started using fork.
+        fds = os.pipe()
+        pid = os.fork()
+        if pid == 0:
+            os.close(fds[0])
+            value = uuid.uuid4()
+            os.write(fds[1], value.hex)
+            sys.exit(0)
+
+        else:
+            os.close(fds[1])
+            parent_value = uuid.uuid4().hex
+            os.waitpid(pid, 0)
+            child_value = os.read(fds[0], 100)
+
+            self.assertNotEqual(parent_value, child_value)
+
+
+
+
 
 def test_main():
     test_support.run_unittest(TestUUID)