+extern int vppcom_session_handle (uint32_t session_index);
+
+extern int vppcom_session_read_segments (uint32_t session_handle,
+ vppcom_data_segments_t ds);
+extern void vppcom_session_free_segments (uint32_t session_handle,
+ vppcom_data_segments_t ds);
+extern int vppcom_data_segment_copy (void *buf, vppcom_data_segments_t ds,
+ uint32_t max_bytes);