HelenOS sources

CAT_IPLINK        332 uspace/srv/net/slip/slip.c 	rc = loc_category_get_id(CAT_IPLINK, &iplinkcid, 0);
CAT_IPLINK        337 uspace/srv/net/slip/slip.c 		    CAT_IPLINK);
CAT_IPLINK        393 uspace/srv/net/slip/slip.c 		    (int) linksid, linkstr, (int) iplinkcid, CAT_IPLINK);
HelenOS homepage, sources at GitHub