feat: error handling for macos hook

skyhook/src/platforms/macos/mod.rs

@@ -9,17 +9,29 @@ use self::listen::RUN_LOOP;
 mod common;
 mod listen;
 
+static mut ERROR: Option<Error> = None;
+
 pub fn start(callback: fn(Event)) -> Result<(), Error> {
     if let Err(e) = thread::Builder::new()
         .name("SkyHook Listener Thread".into())
-        .spawn(move || listen::listen(callback))
+        .spawn(move || {
+            if let Err(e) = listen::listen(callback) {
+                unsafe {
+                    ERROR = Some(e);
+                }
+            }
+        })
     {
         return Err(Error {
             message: format!("Failed to start listener thread: {:?}", e),
         });
     }
 
-    while let None = unsafe { &RUN_LOOP } {}
+    while let None = unsafe { &RUN_LOOP } {
+        if let Some(err) = unsafe { &ERROR } {
+            return Err(err.clone());
+        }
+    }
 
     Ok(())
 }

skyhook/src/types.rs

@@ -12,7 +12,7 @@ pub struct Event {
     pub data: EventData,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct Error {
     pub message: String,
 }