blink.rs

extern crate sysfs_gpio;

use sysfs_gpio::{Direction,Pin};
use std::time::Duration;
use std::thread::sleep;

fn main() {
    let led = Pin::new(16);
    led.with_exported(|| {
        sleep(Duration::from_millis(1000));
        try!(led.set_direction(Direction::Low));
        for _ in 0..10 {
            println!("GO!");
            try!(led.set_value(0));
            sleep(Duration::from_millis(1000));
            try!(led.set_value(1));
            sleep(Duration::from_millis(1000));
        }
        led.set_value(0)
    }).unwrap();
}

udev rule:

SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c '\
    chown -R root:gpio /sys/class/gpio && chmod -R 770 /sys/class/gpio;
    chown -R root:gpio /sys$devpath && chmod -R 770 /sys$devpath\
'"