These functions can easily be misused to corrupt memory, so they very much have something to do with safety. Fil-C goes to great lengths to prevent your use of

These functions can easily be misused to corrupt memory, so they very much have something to do with safety. Fil-C goes to great lengths to prevent your use of those functions leading to memory corruption or any violation of the capability model. Fil-C also makes sigaction memory safe. That protection does allow for signal handlers to longjmp or setcontext or swapcontext