fixed read, code clean uo

V1/led5/src/main.rs

@@ -32,9 +32,7 @@ fn write(path: &str, value: &str) {
     #[cfg(debug_assertions)]
     println!("Wrote value '{}' to '{}'.", value, path);
 }
-
 fn read(path: &str) -> String {
-    return String::new();
     let mut file = File::open(Path::new(path))
         .expect(format!("Open file '{}' failed", path).as_str());
     let mut contents = String::new();
@@ -62,7 +60,6 @@ fn set_direction(port: &str, direction: &str) {
 fn set_value(port: &str, value: &str) {
     write(format!("/sys/class/gpio/gpio{}/value", port).as_str(), value);
 }
-
 fn get_value(port: &str) -> String {
     read(format!("/sys/class/gpio/gpio{}/value", port).as_str())
 }
@@ -70,11 +67,14 @@ fn get_value(port: &str) -> String {
 fn main() {
     let signal = chan_signal::notify(&[Signal::INT, Signal::TERM]);
     let (sdone, rdone) = chan::sync(0);
-    let worker = thread::spawn(move || run(rdone));
+    let worker = thread::Builder::new()
+        .name("worker".to_string())
+        .spawn(move || run(rdone))
+        .expect("Create worker thread failed");
 
     chan_select! {
         default => {
-            worker.join();
+            worker.join().expect("Worker thread paniced");
         },
         signal.recv() -> signal => {
             #[cfg(debug_assertions)]
@@ -84,6 +84,7 @@ fn main() {
         }
     }
 }
+
 fn run(rdone: chan::Receiver<()>) {
     // init
     export(GPIO_PORT_BTN);