.

bigfile/_bigfile.c

@@ -905,7 +905,12 @@ out:
 static const struct bigfile_ops pybigfile_ops = {
     .loadblk    = pybigfile_loadblk,
     .storeblk   = pybigfile_storeblk,
-    // XXX .mmap*
+
+    // TODO .mmap*
+    .mmap_setup_read    = NULL,
+    .remmap_blk_read    = NULL,
+    .munmap             = NULL,
+
     //.release    =
 };
 
@@ -952,6 +957,17 @@ static PyObject *
 pyfile_new(PyTypeObject *type, PyObject *args, PyObject *kw)
 {
     PyBigFile *self;
+    PyObject  *blkmmapper;
+
+    blkmmapper = PyObject_GetAttrString((PyObject*)type, "blkmmapper");
+    PyErr_Clear(); /* GetAttr raises exception if there is no attribute */
+    if (blkmmapper) {
+        if (!PyCapsule_IsValid(blkmmapper, "wendelin.bigfile.IBlkMMapper")) {
+            Py_DECREF(blkmmapper);
+            return PyErr_Format(PyExc_TypeError,
+                "%s: .blkmmapper is not a valid pycapsule with mmap methods", type->tp_name);
+        }
+    }
 
     self = (PyBigFile *)PyType_GenericNew(type, args, kw);
     if (!self)

bigfile/_file_zodb.pyx

@@ -88,7 +88,7 @@ cdef public class _ZBigFile(BigFile) [object _ZBigFile, type _ZBigFile_Type]:
 
     # blkmmapper is pycapsule with virtmem mmap functions for _ZBigFile.
     # The functions rely on .wfileh being initialized by .fileh_open()
-    blkmmapper = PyCapsule_New(<void*>&ZBigFile_mmap_ops, "bigfile.blkmmaper", NULL)
+    blkmmapper = PyCapsule_New(<void*>&ZBigFile_mmap_ops, "wendelin.bigfile.IBlkMMaper", NULL)
 
     # fileh_open wraps BigFile.fileh_open and makes sure that WCFS file handle
     # corresponding to ZBigFile is opened if use_wcfs=True.