[{"data":1,"prerenderedAt":233},["ShallowReactive",2],{"tag-deamon-1":3},{"title":4,"articles":5,"hot_article":18,"month_arch":81,"total":229,"cover":230},"deamon - 独孤影的博客",[6],{"id":7,"title":8,"uri":8,"author":9,"tags":10,"created_at":15,"view_count":16,"content":17},29,"Goj开发过程中遇到gcc进程变为孤儿进程的问题","duguying",[11,12,13,14],"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 "\u002Fdev\u002Frandom"\u003C\u002Fcode>都将会让服务器产生deamon化的gcc进程，时间一久再多的内存都将会被gcc吃掉。\u003C\u002Fp>\u003Cp>\u003Cbr\u002F>\u003C\u002Fp>",{"title":19,"list":20},"最热文章",[21,27,33,39,45,51,57,63,69,75],{"id":22,"title":23,"uri":24,"author":9,"created_at":25,"view_count":26},28,"docker容器目录与主机目录同步","\u002Farticle\u002Fdocker容器目录与主机目录同步","2014-12-31 12:34:08",15573,{"id":28,"title":29,"uri":30,"author":9,"created_at":31,"view_count":32},21,"beego中使用fis","\u002Farticle\u002Fbeego中使用fis","2014-12-03 10:47:56",9253,{"id":34,"title":35,"uri":36,"author":9,"created_at":37,"view_count":38},20,"用github登录，oauth开发","\u002Farticle\u002F用github登录，oauth开发","2014-11-23 13:33:37",9115,{"id":40,"title":41,"uri":42,"author":9,"created_at":43,"view_count":44},18,"windows服务注册工具nssm","\u002Farticle\u002Fwindows服务注册工具nssm","2014-10-31 21:34:39",9054,{"id":46,"title":47,"uri":48,"author":9,"created_at":49,"view_count":50},49,"用latex排版中文书籍","\u002Farticle\u002F用latex排版中文书籍","2016-10-31 11:12:02",8645,{"id":52,"title":53,"uri":54,"author":9,"created_at":55,"view_count":56},19,"texlive中文书签乱码","\u002Farticle\u002Ftexlive中文书签乱码","2014-11-15 02:54:01",8466,{"id":58,"title":59,"uri":60,"author":9,"created_at":61,"view_count":62},6,"Windows上的软件包管理器chocolatey","\u002Farticle\u002FWindows上的软件包管理器chocolatey","2014-08-10 15:55:22",8012,{"id":64,"title":65,"uri":66,"author":9,"created_at":67,"view_count":68},3,"利用开源和免费资源搭建CI环境","\u002Farticle\u002F利用开源和免费资源搭建CI环境","2014-07-04 16:54:58",7740,{"id":70,"title":71,"uri":72,"author":9,"created_at":73,"view_count":74},16,"php-fpm网站目录权限配置","\u002Farticle\u002Fphp-fpm网站目录权限配置","2014-10-18 01:36:10",7276,{"id":76,"title":77,"uri":78,"author":9,"created_at":79,"view_count":80},27,"sublime text 2插件开发，外部修改文件无法重新加载","\u002Farticle\u002Fsublime text 2插件开发，外部修改文件无法重新加载","2014-12-26 20:24:13",7055,{"title":82,"list":83},"按月归档",[84,88,91,94,97,100,103,107,111,114,117,120,124,127,130,134,137,140,143,147,150,153,156,159,162,165,168,171,174,177,180,183,186,189,192,195,198,201,204,207,211,214,217,220,223,226],{"title":85,"uri":86,"view_count":87},"2026年7月","\u002Farchive\u002F2026\u002F7\u002F1","[1]",{"title":89,"uri":90,"view_count":87},"2026年1月","\u002Farchive\u002F2026\u002F1\u002F1",{"title":92,"uri":93,"view_count":87},"2025年4月","\u002Farchive\u002F2025\u002F4\u002F1",{"title":95,"uri":96,"view_count":87},"2024年6月","\u002Farchive\u002F2024\u002F6\u002F1",{"title":98,"uri":99,"view_count":87},"2024年5月","\u002Farchive\u002F2024\u002F5\u002F1",{"title":101,"uri":102,"view_count":87},"2024年4月","\u002Farchive\u002F2024\u002F4\u002F1",{"title":104,"uri":105,"view_count":106},"2023年12月","\u002Farchive\u002F2023\u002F12\u002F1","[6]",{"title":108,"uri":109,"view_count":110},"2023年11月","\u002Farchive\u002F2023\u002F11\u002F1","[2]",{"title":112,"uri":113,"view_count":87},"2023年10月","\u002Farchive\u002F2023\u002F10\u002F1",{"title":115,"uri":116,"view_count":87},"2023年7月","\u002Farchive\u002F2023\u002F7\u002F1",{"title":118,"uri":119,"view_count":110},"2023年6月","\u002Farchive\u002F2023\u002F6\u002F1",{"title":121,"uri":122,"view_count":123},"2023年5月","\u002Farchive\u002F2023\u002F5\u002F1","[3]",{"title":125,"uri":126,"view_count":110},"2023年4月","\u002Farchive\u002F2023\u002F4\u002F1",{"title":128,"uri":129,"view_count":110},"2023年3月","\u002Farchive\u002F2023\u002F3\u002F1",{"title":131,"uri":132,"view_count":133},"2023年2月","\u002Farchive\u002F2023\u002F2\u002F1","[5]",{"title":135,"uri":136,"view_count":87},"2023年1月","\u002Farchive\u002F2023\u002F1\u002F1",{"title":138,"uri":139,"view_count":110},"2022年12月","\u002Farchive\u002F2022\u002F12\u002F1",{"title":141,"uri":142,"view_count":133},"2022年11月","\u002Farchive\u002F2022\u002F11\u002F1",{"title":144,"uri":145,"view_count":146},"2022年10月","\u002Farchive\u002F2022\u002F10\u002F1","[4]",{"title":148,"uri":149,"view_count":106},"2022年9月","\u002Farchive\u002F2022\u002F9\u002F1",{"title":151,"uri":152,"view_count":133},"2022年8月","\u002Farchive\u002F2022\u002F8\u002F1",{"title":154,"uri":155,"view_count":87},"2019年7月","\u002Farchive\u002F2019\u002F7\u002F1",{"title":157,"uri":158,"view_count":87},"2019年2月","\u002Farchive\u002F2019\u002F2\u002F1",{"title":160,"uri":161,"view_count":87},"2018年9月","\u002Farchive\u002F2018\u002F9\u002F1",{"title":163,"uri":164,"view_count":87},"2018年8月","\u002Farchive\u002F2018\u002F8\u002F1",{"title":166,"uri":167,"view_count":87},"2017年11月","\u002Farchive\u002F2017\u002F11\u002F1",{"title":169,"uri":170,"view_count":87},"2017年8月","\u002Farchive\u002F2017\u002F8\u002F1",{"title":172,"uri":173,"view_count":87},"2017年5月","\u002Farchive\u002F2017\u002F5\u002F1",{"title":175,"uri":176,"view_count":87},"2017年4月","\u002Farchive\u002F2017\u002F4\u002F1",{"title":178,"uri":179,"view_count":87},"2016年11月","\u002Farchive\u002F2016\u002F11\u002F1",{"title":181,"uri":182,"view_count":87},"2016年10月","\u002Farchive\u002F2016\u002F10\u002F1",{"title":184,"uri":185,"view_count":110},"2016年9月","\u002Farchive\u002F2016\u002F9\u002F1",{"title":187,"uri":188,"view_count":87},"2016年8月","\u002Farchive\u002F2016\u002F8\u002F1",{"title":190,"uri":191,"view_count":110},"2016年7月","\u002Farchive\u002F2016\u002F7\u002F1",{"title":193,"uri":194,"view_count":133},"2016年6月","\u002Farchive\u002F2016\u002F6\u002F1",{"title":196,"uri":197,"view_count":87},"2015年12月","\u002Farchive\u002F2015\u002F12\u002F1",{"title":199,"uri":200,"view_count":87},"2015年10月","\u002Farchive\u002F2015\u002F10\u002F1",{"title":202,"uri":203,"view_count":110},"2015年2月","\u002Farchive\u002F2015\u002F2\u002F1",{"title":205,"uri":206,"view_count":87},"2015年1月","\u002Farchive\u002F2015\u002F1\u002F1",{"title":208,"uri":209,"view_count":210},"2014年12月","\u002Farchive\u002F2014\u002F12\u002F1","[8]",{"title":212,"uri":213,"view_count":110},"2014年11月","\u002Farchive\u002F2014\u002F11\u002F1",{"title":215,"uri":216,"view_count":133},"2014年10月","\u002Farchive\u002F2014\u002F10\u002F1",{"title":218,"uri":219,"view_count":123},"2014年9月","\u002Farchive\u002F2014\u002F9\u002F1",{"title":221,"uri":222,"view_count":123},"2014年8月","\u002Farchive\u002F2014\u002F8\u002F1",{"title":224,"uri":225,"view_count":123},"2014年7月","\u002Farchive\u002F2014\u002F7\u002F1",{"title":227,"uri":228,"view_count":110},"2013年9月","\u002Farchive\u002F2013\u002F9\u002F1",1,{"url":231,"title":232},"https:\u002F\u002Fimage.duguying.net\u002F2022\u002F09\u002Fij6x8o4s.webp","老家 摄于2020年秋",1790781595542]