+u8 *echo_format_bytes_per_sec (u8 * s, va_list * args);
+int echo_segment_attach (u64 segment_handle, char *name,
+ ssvm_segment_type_t type, int fd);
+u32 echo_segment_lookup (u64 segment_handle);
+void echo_segment_detach (u64 segment_handle);
+int echo_attach_session (uword segment_handle, uword rxf_offset,
+ uword mq_offset, uword txf_offset, echo_session_t *s);
+int echo_segment_attach_mq (uword segment_handle, uword mq_offset,
+ u32 mq_index, svm_msg_q_t **mq);
+svm_fifo_chunk_t *echo_segment_alloc_chunk (uword segment_handle,
+ u32 slice_index, u32 size,
+ uword *offset);