-typedef nal_t *(ptl_interface_t) (int, ptl_pt_index_t, ptl_ac_index_t, ptl_pid_t requested_pid);
-extern nal_t *PTL_IFACE_IP(int, ptl_pt_index_t, ptl_ac_index_t, ptl_pid_t requested_pid);
-extern nal_t *PTL_IFACE_MYR(int, ptl_pt_index_t, ptl_ac_index_t, ptl_pid_t requested_pid);
-