Technical Reference: Communications, Volume 1

DLC_ADD_GRP ioctl Operation for DLC

The DLC_ADD_GRP ioctl operation is selectable through the fp_ioctl kernel service or the ioctl subroutine. It can be called from the process environment only.

The following parameter block adds a group or multicast receive address:

struct dlc_add_grp
{
   __ulong32_t gdlc_sap_corr;   /* GDLC SAP correlator */
   __ulong32_t grp_addr_len;   /* group address length */
   uchar_t grp_addr[DLC_MAX_ADDR]; /* grp addr to be added */
};

The fields of this ioctl operation are:

Field	Description
`gdlc_sap_corr`	Contains the generic data link control (GDLC) service access point (SAP) Correlator being requested to add a group or multicast address to a port.
`grp_addr_len`	Contains the byte length of the group or multicast address to be added.
`grp_addr`	Contains the group or multicast address value to be added.