close_wait
https://www.jianshu.com/p/42918db85f19
fd socket
https://www.cnblogs.com/gqtcgq/p/9070332.html
http://mdba.cn/2015/03/10/tcp-socket文件句柄泄漏/
https://blog.csdn.net/lkkey80/article/details/16856063
fd泄露
https://www.jianshu.com/p/1f9cff12b84f?utm_source=oschina-app
https://blog.csdn.net/wodatoucai/article/details/69389288
https://www.cnblogs.com/switchland/articles/5581929.html
https://blog.csdn.net/hengyunabc/article/details/43865693
pid目录
https://blog.csdn.net/enweitech/article/details/53391567#commentBox
