Technical Reference: Communications, Volume 1

DLC_DEL_GRP ioctl Operation for DLC

The following parameter removes a previously defined group or multicast address:
struct dlc_add_grp { __ulong32_t gdlc_sap_corr; /*GDLC SAP correlator */ __ulong32_t grpaddr_len; /*group address length */ uchar_t grp_addr[DLC_MAX_ADDR]; /*group address to be removed */ };

The fields of this ioctl operation are:

`gdlc_sap_corr`	Indicates the generic data link control (GDLC) service access point (SAP) identifier being requested to remove a group or multicast address from a port. This field is known as the GDLC SAP Correlator field.
`grp_addr_len`	Contains the byte length of the group or multicast address to be removed.
`grp_addr`	Contains the group or multicast address to be removed.

Implementation Specifics

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