The following parameter block tests the link to a remote for a particular local link station (LS):
struct dlc_corr_arg
   {
   ulong_t gdlc_sap_corr;   /* GDLC SAP correlator */
   ulong_t gdlc_ls_corr;   /* GDLC link station correlator */
   };
The fields of this ioctl operation are:
| gdlc_sap_corr | Indicates the GDLC SAP correlator of the target LS. | 
| gdlc_ls_corr | Indicates the GDLC LS correlator to be tested. | 
The DLC_TEST ioctl operation is selectable through the fp_ioctl kernel service or the ioctl subroutine. It can be called from the process environment only.