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I'll explain: Let's say I'm interested in replacing the rand() function used by a certain application. So I attach gdb to this process and make it load my custom shared library (which has a customized rand() function): call (int) dlopen("path_to_library/asdf.so") This would place the customized rand() function inside the process' memory. However, at this point the symbol rand will still point to the default rand() function. Is there a way to make gdb point the symbol to the new rand() function, forcing the process to use my version? I must say I'm also not allowed to use the LD_PRELOAD (linux) nor DYLD_INSERT_LIBRARIES (mac os x) methods for this, because they allow code injection only in the beginning of the program execution. The application that I would like to replace rand() , starts several threads and some of them start new processes, and I'm interested in injecting code on one of these new processes. As I mentioned above, GDB is great for this purpose because it allows code injection into a specific process.

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