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. |