Fix for issue 7895. Avoid crashing the interpreter

when calling platform.mac_ver after calling os.fork by
reading from a system configuration file instead of
using OSX APIs.

Lib/test/test_platform.py

@@ -194,6 +194,25 @@ class PlatformTest(unittest.TestCase):
             else:
                 self.assertEquals(res[2], 'PowerPC')
 
+
+    @unittest.skipUnless(sys.platform == 'darwin', "OSX only test")
+    def test_mac_ver_with_fork(self):
+        # Issue7895: platform.mac_ver() crashes when using fork without exec
+        #
+        # This test checks that the fix for that issue works.
+        #
+        pid = os.fork()
+        if pid == 0:
+            # child
+            info = platform.mac_ver()
+            os._exit(0)
+
+        else:
+            # parent
+            cpid, sts = os.waitpid(pid, 0)
+            self.assertEquals(cpid, pid)
+            self.assertEquals(sts, 0)
+
     def test_dist(self):
         res = platform.dist()