How to detect connection closed before tokio::net::TcpStream write?

[Millione]

I maintained a connection pool in client side, and wanted to pick a connection that not closed by server, so that I can escape the broken pipe error.

I know the epoll flag EPOLLRDHUP can detect the https://man7.org/linux/man-pages/man2/epoll_ctl.2.html. But how to get it usable in tokio?