It's sometimes useful to hook functions at link time. On ELF platforms (among others) a GNU-style linker offers the --wrap option which seems to be exactly what we want. --wrap=symbol Use a wrapper function for symbol. Any undefined reference to symbol will be resolved to "__wrap_symbol". Any undefined reference to "__real_symbol" will be resolved to symbol. Unfortunately there are several problems that arise when using this. In this post I'll cover some ways to solve these problems. Some of ...
