snmp_getnext
struct ber_element *snmp_getnext(struct snmp_agent *, struct ber_oid *, size_t);
if ((pdu = snmp_getnext(agent, oid, argc)) == NULL)
if ((pdu = snmp_getnext(agent, &noid, 1)) == NULL)
if ((pdu = snmp_getnext(agent, &oid, 1)) == NULL)