1 files changed, 3 insertions, 0 deletions
diff --git a/src/DiskWriter.h b/src/DiskWriter.h
index 960e346c..03a4147b 100644
--- a/src/DiskWriter.h
+++ b/src/DiskWriter.h
@@ -85,6 +85,9 @@ public:
 
   // Drops cache in range [offset, offset + len)
   virtual void dropCache(int64_t len, int64_t offset) {}
+
+  // Force physical write of data from OS buffer cache.
+  virtual void flushOSBuffers() {}
 };
 
 } // namespace aria2