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

GDB does have that feature: it is called hardware watchpoints, and it is very well supported on Linux/x86:

(gdb) watch *(int *)0x12345678

If your application crashes GDB, build current GDB from CVS Head.

If that GDB still fails, file a GDB bug.

Chances are we can fix GDB faster than you can hack around SIGSEGV handler (provided a good test case), and fixes to GDB help you with future problems as well.