The previous variant didn't seem to work on Linux.

Author: rohe

src/idpyoidc/storage/listfile.py

@@ -1,5 +1,6 @@
 import logging
 import os
+from pathlib import Path
 import time
 
 from filelock import FileLock
@@ -18,7 +19,6 @@ def __init__(self, file_name):
             fp = open(file_name, "x")
             fp.close()
 
-
     def __getitem__(self, item):
         if self.is_changed(self.file_name):
             self.lst = self._read_info(self.file_name)
@@ -41,12 +41,16 @@ def get_mtime(fname):
         :return: The last time the file was modified.
         """
         try:
-            mtime = os.stat(fname).st_mtime_ns
+            target = Path(fname)
+            mtime = target.stat().st_mtime
+            # mtime = os.stat(fname).st_mtime_ns
         except OSError:
-            # The file might be right in the middle of being written
+            # The file might be right in the middle of being written to
             # so sleep
             time.sleep(1)
-            mtime = os.stat(fname).st_mtime_ns
+            target = Path(fname)
+            mtime = target.stat().st_mtime
+            # mtime = os.stat(fname).st_mtime_ns
 
         return mtime