Mutable pointers in Rust

tckill.rs

use std::run;
use std::str;

fn main() {
    let options = run::ProcessOptions::new();
    let process = run::Process::new("fuser", &[~"-m", ~"/media/truecrypt3"], options);
    match process {
        Some(mut p) => {
            let outdata = p.finish_with_output();
            let outtxt = str::from_utf8(outdata.output);
            if outtxt == "" {
                println("WARN: No process was found holding /media/truecrypt3 mount");
            } else {
                kill_proc(outtxt.trim());
            }
        },
        None    => println("WARN: Unable to run fuser command (null output)")
    }
}


fn kill_proc(process_id: &str) {
    let trimmed = process_id.into_owned();
    
    let options = run::ProcessOptions::new();
    let process = run::Process::new("kill", &[trimmed], options);
    match process {
        Some(_) => println("Done"),
        None    => println("Kill failed")
    }
}