Does anyone know how the subagent send trap?

[Ryan guo]

hi,I am using the net-snmp 5.1.2,and i make a subagent using the agentx,i can do some  actions for the mib modules ,such as add init_***() for mib modules in my subagent main method,but i am puzzling with the trap,how can add trap action into my subagent or register it's function into subagent,who can help me?or give me some example?