How to intercept a sys call.

I was trying to intercept a sys call.but I'm gettting an error
"unresolved symbol sys_call_table"
although I have included proper headers and also declared it as extern
in my module.

I'm using RH-9, kernel 2.4.20-8, pentium m/c. If this variable is not
exported any more by kernel in 2.4.xx series then how to intercept sys

thanks in advance.



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