atexit.rs

use libc;

#[derive(Debug)]
#[repr(C)]
struct Resource(i32);

impl Drop for Resource {
    fn drop(&mut self) {
        println!("goodbye from {}", self.0);
    }
}

fn foo() -> Result<(), ()> {
    return Err(());
}

//#[no_mangle]
extern "C" fn cleanup() {
    println!("doing cleanup stuff");
}

fn main() {
    let x = Resource(0);
    println!("about to terminate the process");
    unsafe { libc::atexit(cleanup); };
    foo().unwrap_or_else(|_| {
        // performs no cleanup.
        std::process::exit(1);
    })
}