Question

Does there exist a way to allocate some memory and have some sort of callback (be it pointer to a function or signal) when the memory is being accessed (either read or written to)?

For example, if I said allocate 1mb of memory, I would like to have a way to call a function when any of that 1mb is being accessed.

The platform I’m working on is x86 Linux and writing in C/C++.

Answer 1

Yes, there is.

Use the mprotect(2) system call (see: http://linux.die.net/man/2/mprotect) to set read only or no access memory protection on the page and set a SIGEGVsignal handler that will be called when the memory has been accessed.

Note that you will need to use mprotect in your signal handler to actually allow the memory access once your signal handler is called and when you do you open a window to anything else to access the memory without you knowing it, for example from a different thread. This may or may not be an issue depending on your specific usage.