ds_unreg_ack_t
ds_unreg_ack_t *ack;
msglen = DS_HDR_SZ + sizeof (ds_unreg_ack_t);
hdr->payload_len = sizeof (ds_unreg_ack_t);
ack = (ds_unreg_ack_t *)(msg + DS_HDR_SZ);
ds_unreg_ack_t *ack;
size_t explen = DS_MSG_LEN(ds_unreg_ack_t);
ack = (ds_unreg_ack_t *)(buf + DS_HDR_SZ);