.

bigfile/_file_zodb.pyx

@@ -51,7 +51,7 @@ cdef extern from * nogil:
 
 import wcfs as pywcfs
 from wcfs.client cimport _wcfs as wcfs
-from golang cimport nil
+from golang cimport error, nil, pyerror
 from cpython cimport PyCapsule_New
 
 from ZODB.Connection import Connection as ZConnection
@@ -83,7 +83,12 @@ cdef public class _ZBigFile(BigFile) [object _ZBigFile, type _ZBigFile_Type]:
         return obj
 
     def __dealloc__(_ZBigFile zf):
-        zf.wfileh = nil # XXX where it should be closed?
+        cdef error err = nil
+        if zf.wfileh != nil:
+            err = zf.wfileh.close()
+        zf.wfileh = nil
+        if err != nil:
+            raise pyerror.from_error(err)
 
 
     # redirect load/store to main class