snmp_create_pdu
snmp_pdu_t *snmp_create_pdu(int, int, char *, int, int);
if ((pdu = snmp_create_pdu(SNMP_MSG_GET, 0, prefix, 1, row)) == NULL)
pdu = snmp_create_pdu(SNMP_MSG_GETBULK, max_reps, oidstrs, n_oids, row);
pdu = snmp_create_pdu(SNMP_MSG_GETNEXT, 0, prefix, 1, row);