[{"data":1,"prerenderedAt":231},["ShallowReactive",2],{"article-Goj开发过程中遇到gcc进程变为孤儿进程的问题":3},{"title":4,"article":5,"hot_article":17,"month_arch":80,"cover":228},"Goj开发过程中遇到gcc进程变为孤儿进程的问题 - 独孤影的博客",{"id":6,"title":7,"uri":7,"author":8,"tags":9,"created_at":14,"view_count":15,"content":16},29,"Goj开发过程中遇到gcc进程变为孤儿进程的问题","duguying",[10,11,12,13],"Goj","孤儿进程","deamon","Online Judge","2015-01-29 17:08:37",3735,"\u003Cp>尽管现在已经放假，没有太多的心思放在开发上，但是Goj项目开发最近一直在缓慢的保持着。最近主要是处理judger与ojsite通信的问题，其过程中并没有遇到什么特殊的问题，TCP以及HTTP协议什么的都不成问题。但是在今天调试提交编译任务时却发现了一个有趣的事情，那就是gcc在特定情况下变成了deamon进程。\u003C\u002Fp>\u003Cp>事情经过是这样的，但凡judger都必须经历\u003Ccode>#include "\u002Fdev\u002Frandom"\u003C\u002Fcode>的考验，至於这是什么、为什么我也懒得解释，下面引用知乎上的一段话，感兴趣的自己看\u003Ca href=\"http:\u002F\u002Fwww.zhihu.com\u002Fquestion\u002F23067497\u002Fanswer\u002F23538675\" target=\"_blank\">全文\u003C\u002Fa>：\u003C\u002Fp>\u003Cblockquote>\u003Cp>小心编译期间的一些“高级功能”，比如 C 的 include 其实是有很多巧妙的用法，试试看在 Linux 下 #include "\u002Fdev\u002Frandom" 或者 #include "\u002Fdev\u002Ftty" 之类的（这两个东西会把网络上不少二流 OJ 直接卡死……）。\u003C\u002Fp>\u003C\u002Fblockquote>\u003Cp>而我的judger是这么解决这个问题的，创建一个线程监控编译子进程，超过一定时间kill。这样原本是没有太大的问题的，而且我也相信这也是一种正确的解决方案，但问题是我并不是直接用judger去调用gcc的，而是将gcc包装到了shell脚本，然后调用sh去执行脚本，这样做也是初期考虑到灵活性而决定的。于是judger的子进程是bash，而gcc是bash的子进程，编译任务阻塞后kill掉的是sh，于是gcc变为了孤儿进程，被init进程收养。\u003C\u002Fp>\u003Cp>\u003Cimg src=\"\u002F\u002Fduguying.oss-cn-qingdao.aliyuncs.com\u002F2015\u002F1\u002F29\u002Filleage_include.png\" title=\"\" alt=\"illeage_include.png\"\u002F>\u003C\u002Fp>\u003Cp>\u003Cimg src=\"\u002F\u002Fduguying.oss-cn-qingdao.aliyuncs.com\u002F2015\u002F1\u002F29\u002Forphan.png\" title=\"\" alt=\"orphan.png\"\u002F>\u003C\u002Fp>\u003Cp>这倒不是什么难题，只要将进程改为能够kill掉gcc及其子进程便可解决，但是若是忽略这个问题将会是一个灾难，每一次\u003Ccode>#include 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