fix: 修复 master 退出环境清理流程

apps/hello/src/stereo_core/master.rs

@@ -12,6 +12,7 @@ use std::net::SocketAddr;
 use std::sync::Arc;
 use std::time::Duration;
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::signal::unix::{SignalKind, signal};
 use tokio::sync::Mutex;
 
 pub const SERVER_TCP_PORT: u16 = 53531;
@@ -96,6 +97,7 @@ pub async fn run_master(master_role: ChannelRole) -> Result<()> {
     let mut stream_start_ts = 0;
     let mut stream_start_seq = 0;
 
+    let audio_loop = async {
         loop {
             // 打开 FIFO
             let mut fifo = match tokio::fs::File::open(AlsaRedirector::fifo_path()).await {
@@ -159,7 +161,6 @@ pub async fn run_master(master_role: ChannelRole) -> Result<()> {
                     let mut remote_pcm = Vec::with_capacity(config.frame_size);
 
                     // 提取左右声道 (假设当前逻辑只处理一个从节点的情况，或所有从节点角色一致)
-                // 如果有多个从节点角色不同，这里需要更复杂的逻辑
                     let slave_role = active_slaves[0].role;
 
                     for i in 0..config.frame_size {
@@ -212,6 +213,37 @@ pub async fn run_master(master_role: ChannelRole) -> Result<()> {
             // 重置流计时
             stream_start_ts = 0;
         }
+        #[allow(unreachable_code)]
+        Ok::<(), anyhow::Error>(())
+    };
+
+    tokio::select! {
+        res = audio_loop => {
+            if let Err(e) = res {
+                eprintln!("❌ 音频循环错误: {:?}", e);
+            }
+        },
+        _ = shutdown_signal() => {},
+    }
+
+    // 显式清理
+    AlsaRedirector::cleanup();
+
+    // 强制退出
+    std::process::exit(0);
+}
+
+/// 监听系统退出信号 (SIGINT, SIGTERM, SIGQUIT)
+async fn shutdown_signal() {
+    let mut sigint = signal(SignalKind::interrupt()).expect("无法注册 SIGINT 处理器");
+    let mut sigterm = signal(SignalKind::terminate()).expect("无法注册 SIGTERM 处理器");
+    let mut sigquit = signal(SignalKind::quit()).expect("无法注册 SIGQUIT 处理器");
+
+    tokio::select! {
+        _ = sigint.recv() => {},
+        _ = sigterm.recv() => {},
+        _ = sigquit.recv() => {},
+    }
 }
 
 /// 处理主节点与从节点的会话