Try #49:

examples/mio.rs

@@ -0,0 +1,45 @@
+extern crate sysfs_gpio;
+use sysfs_gpio::{Direction, Edge, Pin};
+
+extern crate mio;
+use mio::{Events, Poll, PollOpt, Ready, Token};
+
+const GPIO_EDGE: Token = Token(0);
+
+fn get_evented_pin(pin: u16) -> Result<sysfs_gpio::AsyncPinPoller, sysfs_gpio::Error> {
+    let pin = Pin::new(pin.into());
+    pin.set_direction(Direction::In)?;
+    pin.set_edge(Edge::BothEdges)?;
+    pin.get_async_poller()
+}
+
+fn main() {
+    // Construct a new `Poll` handle as well as the `Events` we'll store into
+    let poll = Poll::new().unwrap();
+    let mut events = Events::with_capacity(8);
+
+    let evented_pin = get_evented_pin(49).unwrap();
+
+    // Register the Pin's Evented interface with `Poll`
+    poll.register(
+        &evented_pin,
+        GPIO_EDGE,
+        Ready::readable() | Ready::writable(),
+        PollOpt::edge(),
+    ).unwrap();
+
+    // Linux gives you an event by default so disarm the first one
+    poll.poll(&mut events, None).unwrap();
+
+    loop {
+        // wait for events, which all should be pin toggles
+        poll.poll(&mut events, None).unwrap();
+
+        for event in &events {
+            match event.token() {
+                GPIO_EDGE => println!("Edge Detected"),
+                _ => println!("Unhandled event!"),
+            }
+        }
+    }
+}