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http://wenku.baidu.com/view/1afce5ea172ded630b1cb638.html

http://itdreamerchen.com/%E7%90%86%E8%A7%A3ptrace%E8%B0%83%E8%AF%95%E5%8F%8A%E5%8F%8D%E8%B0%83%E8%AF%95/

http://blog.shengbin.me/posts/detect-debugger-on-linux/