Fix EINTR handling

src/connection.cpp

@@ -28,7 +28,10 @@ Connection::~Connection() {
   if (auto server_ptr = server_.lock()) {
     server_ptr->active_connections_.fetch_sub(1, std::memory_order_relaxed);
   }
-  int e = close(fd_);
+  int e;
+  do {
+    e = close(fd_);
+  } while (e == -1 && errno == EINTR);
   if (e == -1) {
     perror("close");
     std::abort();