OMG，菜鸟出现了什么错误:)我找到了

OMG what a noob error :) i found it

17c17
<   retval = setsockopt(socket_fd, IPPROTO_TCP, SO_KEEPALIVE,
---
>   retval = setsockopt(socket_fd, SOL_SOCKET, SO_KEEPALIVE,