Possible to trap write to address (x86 - linux)

Question

I want to be able to detect when a write to memory address occurs -- for example by setting a callback attached to an interrupt. Does anyone know how?

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Answer 1

If you want to intercept writes to a range of addresses, you can use mprotect() to mark the memory in question as non-writeable, and install a signal handler using sigaction() to catch the resulting SIGSEGV, do your logging or whatever and mark the page as writeable again.