trace module_authorize() call, help

[Leo Lei]

I want to trace the module_authorize() call, follow the following three steps:

1.
autz_redo:
        r = module_authorize(autz_type, request);
        DEBUG2("autz_type: %d; r: %d\n", autz_type, r);
        // autz_type: 0; r: 2   (RLM_MODULE_OK)
        
2.        
        indexed_modcall(RLM_COMPONENT_AUTZ, autz_type, request);

3.        
        this = lookup_by_index(components[comp], idx);  // lookup_by_index(1, 0)


        Why *this* not NULL ?? idx == 0 means what? Can anybody guide me?
        Any advice are appreciated. thx.
        



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