DECnet Socket

// DECnet uses object names & numbers instead of ports
struct sockaddr_dn {
  unsigned short   sdn_family;              // AF_DECnet
  unsigned char    sdn_flags;               // Reserved - set to zero
  unsigned char    sdn_objnum;              // DECnet object number
  unsigned short   sdn_objnamel;            // DECnet object name length
  unsigned char    sdn_objname[DN_MAXOBJL]; // DECnet object name
  struct dn_naddr  sdn_add;                 // DECnet address
};