Q: Making sure nobody hooks the same function/syscall

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How can I make sure that nobody has hooked the same
functions/syscalls that I have- or want to hook?
 
The first problem can of course be solved by making a checksum of
the original function that I want to override, and
comparing the result before hooking.
OTOH this is not very portable, and does not solve the problem
of someone overriding my hooks.

Any help is much apreciated.

-pwa.


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