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1. 默认设置为SL_SO_KEEPALIVE后，哪里可以看到结果？
2. 这个可以自己设置超时时间吗？
给个DEMO最好
keepalive可以通过以下函数进行设置：
间隔时间默认是5min，目前不可被修改，如果说的是SL_SO_RCVTIMEO ，这个可以自己设置
