Sometimes unsafe is used differently, for example when setting up a signal handler or a post-fork handler. Process::pre_exec is unsafe to indicate that some saf

Sometimes unsafe is used differently, for example when setting up a signal handler or a post-fork handler. Process::pre_exec is unsafe to indicate that some safe code may crash or produce UB within this function. Only async-signal safe functions should be used and Rust does not model that in its type system.