Does anyone know how the subagent send trap?

Ryan guo <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]> 
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?
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