Index: Misc/NEWS
===================================================================
--- Misc/NEWS	(revision 60873)
+++ Misc/NEWS	(working copy)
@@ -1149,6 +1149,9 @@
 Extension Modules
 -----------------
 
+- #2112: mmap.error is now a subclass of EnvironmentError and not a
+  direct EnvironmentError
+
 - Bug #2111: mmap segfaults when trying to write a block opened with PROT_READ
 
 - #2063: correct order of utime and stime in os.times() result on Windows.
Index: Lib/test/test_mmap.py
===================================================================
--- Lib/test/test_mmap.py	(revision 60873)
+++ Lib/test/test_mmap.py	(working copy)
@@ -436,6 +436,11 @@
         self.assertRaises(TypeError, m.write, "foo")
 
 
+    def test_error(self):
+        self.assert_(issubclass(mmap.error, EnvironmentError))
+        self.assert_("mmap.error" in str(mmap.error))
+
+
 def test_main():
     run_unittest(MmapTests)
 
Index: Modules/mmapmodule.c
===================================================================
--- Modules/mmapmodule.c	(revision 60873)
+++ Modules/mmapmodule.c	(working copy)
@@ -1402,7 +1402,10 @@
 	dict = PyModule_GetDict(module);
 	if (!dict)
 		return;
-	mmap_module_error = PyExc_EnvironmentError;
+	mmap_module_error = PyErr_NewException("mmap.error",
+		PyExc_EnvironmentError , NULL);
+	if (mmap_module_error == NULL)
+		return;
 	PyDict_SetItemString(dict, "error", mmap_module_error);
 	PyDict_SetItemString(dict, "mmap", (PyObject*) &mmap_object_type);
 #ifdef PROT_EXEC