func: void aio_context_setup(AioContext *ctx, Error **errp)
  
  {
  
  #ifdef CONFIG_EPOLL
  
      assert(!ctx->epollfd);
  
      ctx->epollfd = epoll_create1(EPOLL_CLOEXEC);
  
      if (ctx->epollfd == -1) {
  
          ctx->epoll_available = false;
  
      } else {
  
          ctx->epoll_available = true;
  
      }
  
  #endif
  
  }
  