Library Interpolation is a technique that allows the interception of certain function calls and without requiring the recompilation of the calling program or shared objects. With this technique, a special interposable library is constructed so that at load time, the program links to the interposable library instead of the shared library. For each function in the shared library for which auditing is to be invoked, the interposable library contains a function with the same name. If the desired function is not contained in the interposed library, the loader continues its search in the shared library and links directly with the target function. The interposed module can perform any auditing-related function, such as recording the event, fact of the call, the parameters passed and returned, the return address in the calling program, and so forth. Typically, the interposed module will call the actual shared function so that the applications behavior is not altered, just instrumented.
LD_PRELOAD is an optional environmental variable that allows additional, user-specified, ELF shared objects to
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