isnst_send_pdu
rc = isnst_send_pdu(so, pdu);
rc = isnst_send_pdu(so, pdu);
rc = isnst_send_pdu(so, pdu);
if (isnst_send_pdu(ks, rsp_pdu) != 0) {
isnst_send_pdu(void *so, isns_pdu_t *pdu);