Catch SIGSEGV in Rust

sigsegv.rs

#![feature(libc)]

extern crate libc;

use libc::*;
use std::panic::*;
use std::ptr::*;

fn main() {
    unsafe {
        let f = handler as *const fn(c_int);
        signal(SIGSEGV, f as size_t);
    }

    crash();
    crash();
    crash();

    println!("still working");
}

fn crash() {
    unsafe {
        let _ = catch_unwind(|| {
            let p: *mut i32 = null_mut();
            *p = 1;
        });
    }
}

unsafe extern "C" fn handler(signum: c_int) {
    println!("received signal {}", signum);
    let mut sigs = std::mem::uninitialized::<sigset_t>();
    sigemptyset(&mut sigs);
    sigaddset(&mut sigs, signum);
    sigprocmask(SIG_UNBLOCK, &sigs, std::ptr::null_mut());
    panic!("SIGV!");
}