.

wcfs/internal/_wcfs.pxd

@@ -106,6 +106,7 @@ cdef extern from "wcfs/internal/wcfs.h" namespace "wcfs" nogil:
         pair[Mapping, error] mmap       "_ptr()->mmap"      (int64_t blk_start, int64_t blk_len)
 
     cppclass _Mapping:
+        FileH   fileh
         int64_t blk_start
         int64_t blk_stop()  const
         uint8_t *mem_start
@@ -115,6 +116,7 @@ cdef extern from "wcfs/internal/wcfs.h" namespace "wcfs" nogil:
 
     cppclass Mapping (refptr[_Mapping]):
         # Mapping.X = Mapping->X in C++
+        FileH   fileh           "_ptr()->fileh"
         int64_t blk_start       "_ptr()->blk_start"
         int64_t blk_stop        "_ptr()->blk_stop"      ()  const
         uint8_t *mem_start      "_ptr()->mem_start"
@@ -139,6 +141,7 @@ cdef class PyFileH:
 
 cdef class PyMapping:
     cdef Mapping wmmap
+    cdef readonly PyFileH fileh
 
 cdef class PyWatchLink:
     cdef WatchLink wlink

wcfs/internal/_wcfs.pyx

@@ -106,8 +106,11 @@ cdef class PyFileH:
         if err != nil:
             raise pyerr(err)
 
+        assert wmmap.fileh .eq (pywfileh.wfileh)
+
         cdef PyMapping pywmmap = PyMapping.__new__(PyMapping)
         pywmmap.wmmap = wmmap
+        pywmmap.fileh = pywfileh
         return pywmmap
 
     # XXX for tests