Net-SNMP structure pointer issue

Hi,

Our MIB specification contains various tables and scalar entries that were converted to C code using 'mib2c'.

The C files forming our MIB branch were compiled into a shared object that is dynamically loaded using dlmod.
However, the initialization of each object in the module runs into NULL pointer errors:

Module vsatSb2Ut loaded
netsnmp_get_table_handler(NULL) called
netsnmp_inject_handler() called illegally
netsnmp_assert handler != ((void *)0) failed agent_handler.c:418 netsnmp_inject_handler_before()
netsnmp_get_table_handler(NULL) called
netsnmp_inject_handler() called illegally
netsnmp_assert handler != ((void *)0) failed agent_handler.c:418 netsnmp_inject_handler_before()
handlerName = vsatSb2UtMacTablenetsnmp_get_table_handler(NULL) called

..... and so on.

Using gdb, I was able to find out the origin of the NULL pointer.
In any of our initialize_table_xxx() functions that are auto generated by the mib2c  tool, these structures are populated:

netsnmp_handler_registration *reg;
netsnmp_iterator_info *iinfo;
netsnmp_table_registration_info *table_info;

Finally, this libnetsnmp iterator function is called within the initialization function:
netsnmp_register_table_iterator(reg, iinfo);

Both reg and iinfo are valid memory addresses in both our module and in the libnetsnmp functions.
However, iinfo->table_reginfo which prints a valid address in our module becomes address 0x0 as soon as it enters the netsnmp_register_table_iterator() function.
This is the cause of the NULL pointer errors seen above.

If you have any comments, debug suggestions or more questions, kindly reply.

Thanks,
Sri

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