The usual way to generate an exit status for a signal that normally terminates the process is to explicitly unset the handler and then raise the signal yourself. In C, the latter half of that can be done with the ‘raise’ function; on (at least one) Linux with glibc, this uses tgkill underneath. I assume Rust doesn't expose this though from what you said?
That's a cool trick. There are crates for signal handling, and the libc crate exports raise(), they just aren't part of the standard library which attempts to be cross-platform. But if you're already going to unset the signal handler you might as well do that from the start (in this particular case).
