Remove the socket file when CTRL-C the vineyardd instance (#1643)

Fixes #1625

Signed-off-by: Tao He <[email protected]>

src/server/async/socket_server.cc

@@ -1720,14 +1720,19 @@ void SocketServer::Stop() {
   if (stopped_.exchange(true)) {
     return;
   }
+  // stop accepting further connections
+  this->Close();
 
   std::lock_guard<std::recursive_mutex> scope_lock(this->connections_mutex_);
   std::vector<int> connection_ids_;
   for (auto& pair : connections_) {
     pair.second->Stop();
   }
+  connections_.clear();
 }
 
+void SocketServer::Close() { closable_.store(true); }
+
 bool SocketServer::ExistsConnection(int conn_id) const {
   std::lock_guard<std::recursive_mutex> scope_lock(this->connections_mutex_);
   return connections_.find(conn_id) != connections_.end();

src/server/async/socket_server.h

@@ -236,7 +236,7 @@ class SocketServer {
    * Cancel the "async_accept" action on the acceptor to stop accepting
    * further connections.
    */
-  virtual void Close() { closable_.store(true); }
+  virtual void Close();
 
   /**
    * Check if @conn_id@ exists in the connection pool.