daemonize 0.0.2

Library to enable your code run as a daemon process on Unix-like systems.
Documentation 
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extern crate daemonize;
extern crate libc;

use std::io::prelude::*;

use daemonize::{Daemonize};

fn main() {
    let args = std::env::args().collect::<Vec<String>>();
    let ref user = args[1];
    let ref group = args[2];
    let ref file = args[3];

    let mut file = std::fs::File::create(file).unwrap();
    Daemonize::new().user(user).group(group).start().unwrap();
    unsafe {
        file.write_all(format!("{} {}", libc::getuid(), libc::getgid()).as_bytes()).unwrap();
    }
}