print error info

src/bin/main.rs

@@ -1,4 +1,4 @@
-use tun2proxy::{desktop_run_async, Args, BoxError};
+use tun2proxy::{Args, BoxError};
 
 #[tokio::main]
 async fn main() -> Result<(), BoxError> {
@@ -13,8 +13,8 @@ async fn main() -> Result<(), BoxError> {
     let join_handle = tokio::spawn({
         let shutdown_token = shutdown_token.clone();
         async move {
-            if let Err(err) = desktop_run_async(args, shutdown_token).await {
-                log::error!("desktop_run_async error: {}", err);
+            if let Err(err) = tun2proxy::desktop_run_async(args, shutdown_token).await {
+                log::error!("main loop error: {}", err);
             }
         }
     });

src/desktop_api.rs

@@ -51,9 +51,17 @@ pub unsafe extern "C" fn tun2proxy_run_with_name(
         args.bypass(bypass.parse().unwrap());
     }
 
+    let main_loop = async move {
+        if let Err(err) = desktop_run_async(args, shutdown_token).await {
+            log::error!("main loop error: {}", err);
+            return Err(err);
+        }
+        Ok(())
+    };
+
     let exit_code = match tokio::runtime::Builder::new_multi_thread().enable_all().build() {
         Err(_e) => -3,
-        Ok(rt) => match rt.block_on(desktop_run_async(args, shutdown_token)) {
+        Ok(rt) => match rt.block_on(main_loop) {
             Ok(_) => 0,
             Err(_e) => -4,
         },