about pam programming , plz help.

[lu.peng]

hi , all
   
     environment is : postfix + cyrus sasl + pam . 
     when need to do authenticate , postfix will invoke the sasl_server_new() to create a new context for this session of connection. 
     then the pam module can get some info from that session,such as username and passwd .
     my problem is , i want to pass one of my self-defined args to pam module , but i don't know how to program in postfix and pam module .

     thanks in advance .
     
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