套接字仍然打开，可以接受新请求。
大多数 TCP 服务只是在收到新的套接字连接请求时尝试接受它们。
Most TCP services simply attempt to accept new socket connection requests as they are received.
上面的命令中指定了值0，将允许通过单个套接字发送的请求数量设置为无限大。
In the above command a value of 0 is specified, which sets the number of requests allowed down a single socket to unlimited.
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