RAII-Simulated Cleanup

RAII (Resource Acquisition Is Initialization) is a pattern from C++ where a resource's cleanup is tied automatically to an object's lifetime. C has no destructors to do this automatically, so similar cleanup guarantees are simulated manually, for example using the goto statement to jump to a single cleanup section at the end of a function that frees all acquired resources. Some compilers also support a non-standard __attribute__((cleanup)) extension that calls a specified function automatically when a variable goes out of scope. Both approaches aim to reduce the risk of forgetting to release a resource on one of several possible exit paths from a function.