{"id":143,"date":"2026-03-23T16:31:33","date_gmt":"2026-03-23T08:31:33","guid":{"rendered":"https:\/\/codergodv.xyz\/?p=143"},"modified":"2026-03-23T16:37:40","modified_gmt":"2026-03-23T08:37:40","slug":"linux%e8%bf%9b%e7%a8%8b%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"https:\/\/codergodv.xyz\/index.php\/2026\/03\/23\/linux%e8%bf%9b%e7%a8%8b%e6%8e%a7%e5%88%b6\/","title":{"rendered":"Linux\u8fdb\u7a0b\u63a7\u5236"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u8fdb\u7a0b\u521b\u5efa<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">fork\u51fd\u6570\u521d\u59cb<\/h3>\n\n\n\n<p>\u5728Linux\u4e2d\uff0cfork\u51fd\u6570\u662f\u975e\u5e38\u91cd\u8981\u7684\u51fd\u6570\uff0c\u5b83\u4ece\u5df2\u5b58\u5728\u8fdb\u7a0b\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u8fdb\u7a0b\u3002\u65b0\u8fdb\u7a0b\u4e3a\u5b50\u8fdb\u7a0b\uff0c\u800c\u539f\u8fdb\u7a0b\u4e3a\u7236\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<br>\u5728\u5b50\u8fdb\u7a0b\u4e2d\u8fd4\u56de0\uff0c\u7236\u8fdb\u7a0b\u4e2d\u8fd4\u56de\u5b50\u8fdb\u7a0b\u7684PID\uff0c\u5b50\u8fdb\u7a0b\u521b\u5efa\u5931\u8d25\u8fd4\u56de-1\u3002<\/p>\n\n\n\n<p>\u8fdb\u7a0b\u8c03\u7528fork\uff0c\u5f53\u63a7\u5236\u8f6c\u79fb\u5230\u5185\u6838\u4e2d\u7684fork\u4ee3\u7801\u540e\uff0c\u5185\u6838\u505a\uff1a<\/p>\n\n\n\n<ul 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src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-16697287808153.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-16697287808153.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<p>\u8fd9\u91cc\u53ef\u4ee5\u770b\u5230\uff0cBefore\u53ea\u8f93\u51fa\u4e86\u4e00\u6b21\uff0c\u800cAfter\u8f93\u51fa\u4e86\u4e24\u6b21\u3002\u5176\u4e2d\uff0cBefore\u662f\u7531\u7236\u8fdb\u7a0b\u6253\u5370\u7684\uff0c\u800c\u8c03\u7528fork\u51fd\u6570\u4e4b\u540e\u6253\u5370\u7684\u4e24\u4e2aAfter\uff0c\u5219\u5206\u522b\u7531\u7236\u8fdb\u7a0b\u548c\u5b50\u8fdb\u7a0b\u4e24\u4e2a\u8fdb\u7a0b\u6267\u884c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cfork\u4e4b\u524d\u7236\u8fdb\u7a0b\u72ec\u7acb\u6267\u884c\uff0c\u800cfork\u4e4b\u540e\u7236\u5b50\u4e24\u4e2a\u6267\u884c\u6d41\u5206\u522b\u6267\u884c\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u6ce8\u610f\uff1a<\/strong> fork\u4e4b\u540e\uff0c\u7236\u8fdb\u7a0b\u548c\u5b50\u8fdb\u7a0b\u8c01\u5148\u6267\u884c\u5b8c\u5168\u7531\u8c03\u5ea6\u5668\u51b3\u5b9a\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">fork\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow 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alt=\"img\"\/><\/div><\/figure>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728fork\u51fd\u6570\u5185\u90e8\u6267\u884cruturn\u8bed\u53e5\u4e4b\u524d\uff0c\u5b50\u8fdb\u7a0b\u5c31\u5df2\u7ecf\u521b\u5efa\u5b8c\u6bd5\u4e86\uff0c\u90a3\u4e48\u4e4b\u540e\u7684return \u8bed\u53e5\u4e0d\u4ec5\u7236\u8fdb\u7a0b\u9700\u8981\u6267\u884c\uff0c\u5b50\u8fdb\u7a0b\u4e5f\u540c\u6837\u9700\u8981\u6267\u884c\uff0c\u8fd9\u5c31\u662ffork\u51fd\u6570\u6709\u4e24\u4e2a\u8fd4\u56de\u503c\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<h3 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wp-block-quote-is-layout-flow\">\n<p>2.\u4e3a\u4ec0\u4e48\u4e0d\u5728\u521b\u5efa\u5b50\u8fdb\u7a0b\u7684\u65f6\u5019\u5c31\u8fdb\u884c\u6570\u636e\u7684\u62f7\u8d1d\uff1f<\/p>\n<\/blockquote>\n\n\n\n<p>\u5b50\u8fdb\u7a0b\u4e0d\u4e00\u5b9a\u4f1a\u4f7f\u7528\u7236\u8fdb\u7a0b\u7684\u6240\u6709\u6570\u636e\uff0c\u5e76\u4e14\u5728\u5b50\u8fdb\u7a0b\u4e0d\u5bf9\u6570\u636e\u8fdb\u884c\u5199\u5165\u7684\u60c5\u51b5\u4e0b\uff0c\u6ca1\u6709\u5fc5\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u62f7\u8d1d\uff0c\u6211\u4eec\u5e94\u8be5\u6309\u9700\u5206\u914d\uff0c\u5728\u9700\u8981\u4fee\u6539\u6570\u636e\u7684\u65f6\u5019\u518d\u5206\u914d\uff08\u5ef6\u65f6\u5206\u914d\uff09\uff0c\u8fd9\u6837\u53ef\u4ee5\u9ad8\u6548\u7684\u4f7f\u7528\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>3.\u4ee3\u7801\u4f1a\u4e0d\u4f1a\u5199\u65f6\u62f7\u8d1d<\/p>\n<\/blockquote>\n\n\n\n<p>90%\u7684\u60c5\u51b5\u4e0b\u662f\u4e0d\u4f1a\u7684\uff0c\u4f46\u8fd9\u5e76\u4e0d\u4ee3\u8868\u4ee3\u7801\u4e0d\u80fd\u8fdb\u884c\u5199\u65f6\u62f7\u8d1d\uff0c\u4f8b\u5982\u5728\u8fdb\u884c\u8fdb\u7a0b\u66ff\u6362\u7684\u65f6\u5019\uff0c\u5219\u9700\u8981\u8fdb\u884c\u4ee3\u7801\u7684\u5199\u65f6\u62f7\u8d1d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">fork\u5e38\u89c4\u7528\u6cd5<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e00\u4e2a\u8fdb\u7a0b\u5e0c\u671b\u590d\u5236\u81ea\u5df1\uff0c\u4f7f\u5b50\u8fdb\u7a0b\u540c\u65f6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u6bb5\u3002\u4f8b\u5982\u7236\u8fdb\u7a0b\u7b49\u5f85\u5ba2\u6237\u7aef\u8bf7\u6c42\uff0c\u751f\u6210\u5b50\u8fdb\u7a0b\u6765\u5904\u7406\u8bf7\u6c42\u3002<\/li>\n\n\n\n<li>\u4e00\u4e2a\u8fdb\u7a0b\u8981\u6267\u884c\u4e00\u4e2a\u4e0d\u540c\u7684\u7a0b\u5e8f\u3002\u4f8b\u5982\u5b50\u8fdb\u7a0b\u4ecefork\u8fd4\u56de\u540e\uff0c\u8c03\u7528exec\u51fd\u6570\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">fork\u8c03\u7528\u5931\u8d25\u7684\u539f\u56e0<\/h3>\n\n\n\n<p>fork\u51fd\u6570\u521b\u5efa\u5b50\u8fdb\u7a0b\u4e5f\u53ef\u80fd\u4f1a\u5931\u8d25\uff0c\u6709\u4ee5\u4e0b\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7cfb\u7edf\u4e2d\u6709\u592a\u591a\u7684\u8fdb\u7a0b\uff0c\u5185\u5b58\u7a7a\u95f4\u4e0d\u8db3\uff0c\u5b50\u8fdb\u7a0b\u521b\u5efa\u5931\u8d25\u3002<\/li>\n\n\n\n<li>\u5b9e\u9645\u7528\u6237\u7684\u8fdb\u7a0b\u6570\u8d85\u8fc7\u4e86\u9650\u5236\uff0c\u5b50\u8fdb\u7a0b\u521b\u5efa\u5931\u8d25\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fdb\u7a0b\u7ec8\u6b62<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fdb\u7a0b\u9000\u51fa\u573a\u666f<\/h3>\n\n\n\n<p>\u8fdb\u7a0b\u9000\u51fa\u53ea\u6709\u4e09\u79cd\u60c5\u51b5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4ee3\u7801\u8fd0\u884c\u5b8c\u6bd5\uff0c\u7ed3\u679c\u6b63\u786e\u3002<\/li>\n\n\n\n<li>\u4ee3\u7801\u8fd0\u884c\u5b8c\u6bd5\uff0c\u7ed3\u679c\u4e0d\u6b63\u786e\u3002<\/li>\n\n\n\n<li>\u4ee3\u7801\u5f02\u5e38\u7ec8\u6b62\uff08\u8fdb\u7a0b\u5d29\u6e83\uff09\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fdb\u7a0b\u9000\u51fa\u7801<\/h3>\n\n\n\n<p>\u6211\u4eec\u90fd\u77e5\u9053main\u51fd\u6570\u662f\u4ee3\u7801\u7684\u5165\u53e3\uff0c\u4f46\u5b9e\u9645\u4e0amain\u51fd\u6570\u53ea\u662f\u7528\u6237\u7ea7\u522b\u4ee3\u7801\u7684\u5165\u53e3\uff0cmain\u51fd\u6570\u4e5f\u662f\u88ab\u5176\u4ed6\u51fd\u6570\u8c03\u7528\u7684\uff0c\u4f8b\u5982\u5728VS2013\u5f53\u4e2dmain\u51fd\u6570\u5c31\u662f\u88ab\u4e00\u4e2a\u540d\u4e3a__tmainCRTStartup\u7684\u51fd\u6570\u6240\u8c03\u7528\uff0c\u800c__tmainCRTStartup\u51fd\u6570\u53c8\u662f\u901a\u8fc7\u52a0\u8f7d\u5668\u88ab\u64cd\u4f5c\u7cfb\u7edf\u6240\u8c03\u7528\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4<strong>main\u51fd\u6570\u662f\u95f4\u63a5\u6027\u88ab\u64cd\u4f5c\u7cfb\u7edf\u6240\u8c03\u7528\u7684\u3002<\/strong><\/p>\n\n\n\n<p>\u65e2\u7136main\u51fd\u6570\u662f\u95f4\u63a5\u6027\u88ab\u64cd\u4f5c\u7cfb\u7edf\u6240\u8c03\u7528\u7684\uff0c\u90a3\u4e48\u5f53main\u51fd\u6570\u8c03\u7528\u7ed3\u675f\u540e\u5c31\u5e94\u8be5\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u8fd4\u56de\u76f8\u5e94\u7684\u9000\u51fa\u4fe1\u606f\uff0c\u800c\u8fd9\u4e2a\u6240\u8c13\u7684\u9000\u51fa\u4fe1\u606f\u5c31\u662f\u4ee5\u9000\u51fa\u7801\u7684\u5f62\u5f0f\u4f5c\u4e3amain\u51fd\u6570\u7684\u8fd4\u56de\u503c\u8fd4\u56de\uff0c\u6211\u4eec\u4e00\u822c\u4ee50\u8868\u793a\u4ee3\u7801\u6210\u529f\u6267\u884c\u5b8c\u6bd5\uff0c\u4ee5\u975e0\u8868\u793a\u4ee3\u7801\u6267\u884c\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u9519\u8bef\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u90fd\u5728main\u51fd\u6570\u7684\u6700\u540e\u8fd4\u56de0\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<p>\u5f53\u6211\u4eec\u7684\u4ee3\u7801\u8fd0\u884c\u8d77\u6765\u5c31\u53d8\u6210\u4e86\u8fdb\u7a0b\uff0c\u5f53\u8fdb\u7a0b\u7ed3\u675f\u540emain\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5b9e\u9645\u4e0a\u5c31\u662f\u8be5\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u9000\u51fa\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>echo $?<\/code>\u547d\u4ee4\u67e5\u770b\u6700\u8fd1\u4e00\u6b21\u8fdb\u7a0b\u9000\u51fa\u7684\u9000\u51fa\u7801\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5bf9\u4e8e\u4e0b\u9762\u8fd9\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129232233526.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129232233526.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129232233526\"\/><\/div><\/figure>\n\n\n\n<p>\u4ee3\u7801\u8fd0\u884c\u7ed3\u675f\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u67e5\u770b\u8be5\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u9000\u51fa\u7801<\/p>\n\n\n\n<p><code>echo $?<\/code><\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129232354137.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129232354137.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129232354137\"\/><\/div><\/figure>\n\n\n\n<p>\u8fd9\u65f6\u4fbf\u53ef\u4ee5\u786e\u8ba4main\u51fd\u6570\u662f\u987a\u5229\u6267\u884c\u5b8c\u6bd5\u4e86\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4e3a\u4ec0\u4e48\u4ee50\u8868\u793a\u4ee3\u7801\u6267\u884c\u6210\u529f\uff0c\u4ee5\u975e0\u8868\u793a\u4ee3\u7801\u6267\u884c\u9519\u8bef\uff1f<\/p>\n<\/blockquote>\n\n\n\n<p>\u56e0\u4e3a\u4ee3\u7801\u6267\u884c\u6210\u529f\u53ea\u6709\u4e00\u79cd\u60c5\u51b5\uff0c\u6210\u529f\u4e86\u5c31\u662f\u6210\u529f\u4e86\uff0c\u800c\u4ee3\u7801\u6267\u884c\u9519\u8bef\u5374\u6709\u591a\u79cd\u539f\u56e0\uff0c\u4f8b\u5982\u5185\u5b58\u7a7a\u95f4\u4e0d\u8db3\uff0c\u975e\u6cd5\u8bbf\u95ee\u4ee5\u53ca\u6808\u6ea2\u51fa\u7b49\u7b49\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u7528\u8fd9\u4e9b\u975e0\u6570\u5b57\u5206\u522b\u8868\u793a\u4ee3\u7801\u6267\u884c\u9519\u8bef\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<p>C\u8bed\u8a00\u5f53\u4e2d\u7684strerror\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7\u9519\u8bef\u7801\uff0c\u83b7\u53d6\u8be5\u9519\u8bef\u7801\u5728C\u8bed\u8a00\u5f53\u4e2d\u5bf9\u5e94\u7684\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129233116269.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129233116269.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129233116269\"\/><\/div><\/figure>\n\n\n\n<p>\u8fd0\u884c\u4ee3\u7801\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u770b\u5230\u5404\u4e2a\u9519\u8bef\u7801\u5bf9\u5e94\u7684\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129233341120.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129233341120.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129233341120\"\/><\/div><\/figure>\n\n\n\n<p>\u5b9e\u9645\u4e0aLinux\u4e2d\u7684ls\u3001pwd\u7b49\u547d\u4ee4\u90fd\u662f\u53ef\u6267\u884c\u7a0b\u5e8f\uff0c\u4f7f\u7528\u8fd9\u4e9b\u547d\u4ee4\u540e\u6211\u4eec\u4e5f\u53ef\u4ee5\u67e5\u770b\u5176\u5bf9\u5e94\u7684\u9000\u51fa\u7801\u3002<br>\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u4e9b\u547d\u4ee4\u6210\u529f\u6267\u884c\u540e\uff0c\u5176\u9000\u51fa\u7801\u4e5f\u662f0\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129233526700.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129233526700.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129233526700\"\/><\/div><\/figure>\n\n\n\n<p>\u4f46\u662f\u547d\u4ee4\u6267\u884c\u9519\u8bef\u540e\uff0c\u5176\u9000\u51fa\u7801\u5c31\u662f\u975e0\u7684\u6570\u5b57\uff0c\u8be5\u6570\u5b57\u5177\u4f53\u8868\u67d0\u4e00\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129233609167.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129233609167.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129233609167\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u6ce8\u610f\uff1a<\/strong> \u9000\u51fa\u7801\u90fd\u6709\u5bf9\u5e94\u7684\u5b57\u7b26\u4e32\u542b\u4e49\uff0c\u5e2e\u52a9\u7528\u6237\u786e\u8ba4\u6267\u884c\u5931\u8d25\u7684\u539f\u56e0\uff0c\u800c\u8fd9\u4e9b\u9000\u51fa\u7801\u5177\u4f53\u4ee3\u8868\u4ec0\u4e48\u542b\u4e49\u662f\u4eba\u4e3a\u89c4\u5b9a\u7684\uff0c\u4e0d\u540c\u73af\u5883\u4e0b\u76f8\u540c\u7684\u9000\u51fa\u7801\u7684\u5b57\u7b26\u4e32\u542b\u4e49\u53ef\u80fd\u4e0d\u540c\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fdb\u7a0b\u6b63\u5e38\u9000\u51fa<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">return\u9000\u51fa<\/h4>\n\n\n\n<p>\u5728main\u51fd\u6570\u4e2d\u4f7f\u7528return\u9000\u51fa\u8fdb\u7a0b\u662f\u6211\u4eec\u5e38\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5728main\u51fd\u6570\u6700\u540e\u4f7f\u7528return\u9000\u51fa\u8fdb\u7a0b<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/image-20221129233947104.png\" alt=\"image-20221129233947104\"><\/p>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129234049678.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129234049678.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129234049678\"\/><\/div><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">exit\u51fd\u6570<\/h4>\n\n\n\n<p>\u4f7f\u7528exit\u51fd\u6570\u9000\u51fa\u8fdb\u7a0b\u4e5f\u662f\u6211\u4eec\u5e38\u7528\u7684\u65b9\u6cd5\uff0cexit\u51fd\u6570\u53ef\u4ee5\u5728\u4ee3\u7801\u4e2d\u7684\u4efb\u4f55\u5730\u65b9\u9000\u51fa\u8fdb\u7a0b\uff0c\u5e76\u4e14exit\u51fd\u6570\u5728\u9000\u51fa\u8fdb\u7a0b\u524d\u4f1a\u505a\u4e00\u7cfb\u5217\u5de5\u4f5c\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6267\u884c\u7528\u6237\u901a\u8fc7atexit\u6216on_exit\u5b9a\u4e49\u7684\u6e05\u7406\u51fd\u6570\u3002<\/li>\n\n\n\n<li>\u5173\u95ed\u6240\u6709\u6253\u5f00\u7684\u6d41\uff0c\u6240\u6709\u7f13\u5b58\u6570\u636e\u5747\u88ab\u5199\u5165\u3002<\/li>\n\n\n\n<li>\u8c03\u7528_exit\u51fd\u6570\u7ec8\u6b62\u8fdb\u7a0b\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u4e2dexit\u7ec8\u6b62\u8fdb\u7a0b\u524d\u4f1a\u5c06\u7f13\u51b2\u533a\u5f53\u4e2d\u7684\u6570\u636e\u8f93\u51fa\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129234602226.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129234602226.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129234602226\"\/><\/div><\/figure>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129234627719.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129234627719.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129234627719\"\/><\/div><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">_exit\u51fd\u6570<\/h4>\n\n\n\n<p>\u4f7f\u7528_exit\u51fd\u6570\u9000\u51fa\u8fdb\u7a0b\u7684\u65b9\u6cd5\u6211\u4eec\u5e76\u4e0d\u7ecf\u5e38\u4f7f\u7528\uff0c_exit\u51fd\u6570\u4e5f\u53ef\u4ee5\u5728\u4ee3\u7801\u4e2d\u7684\u4efb\u4f55\u5730\u65b9\u9000\u51fa\u8fdb\u7a0b\uff0c\u4f46\u662f_exit\u51fd\u6570\u4f1a\u76f4\u63a5\u7ec8\u6b62\u8fdb\u7a0b\uff0c\u5e76\u4e0d\u4f1a\u5728\u9000\u51fa\u8fdb\u7a0b\u524d\u505a\u4efb\u4f55\u6536\u5c3e\u5de5\u4f5c\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u4e2d\u4f7f\u7528_exit\u7ec8\u6b62\u8fdb\u7a0b\uff0c\u5219\u7f13\u51b2\u533a\u5f53\u4e2d\u7684\u6570\u636e\u5c06\u4e0d\u4f1a\u88ab\u8f93\u51fa\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129235046775.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129235046775.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129235046775\"\/><\/div><\/figure>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/image-20221129235105865.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/image-20221129235105865.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20221129235105865\"\/><\/div><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">return\u3001exit\u3001_exit\u4e4b\u95f4\u7684\u533a\u522b\u548c\u8054\u7cfb<\/h4>\n\n\n\n<p><strong>\u533a\u522b\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u53ea\u6709main\u51fd\u6570\u5f53\u4e2d\u7684return\u624d\u80fd\u8d77\u5230\u9000\u51fa\u8fdb\u7a0b\u7684\u4f5c\u7528\uff0c\u5b50\u51fd\u6570\u5f53\u4e2d\u7684return\u4e0d\u80fd\u9000\u51fa\u8fdb\u7a0b\uff0c\u800cexit\u51fd\u6570\u548c_exit\u51fd\u6570\u5728\u4ee3\u7801\u4e2d\u7684\u4efb\u4f55\u5730\u65b9\u90fd\u53ef\u4ee5\u8d77\u5230\u9000\u51fa\u8fdb\u7a0b\u7684\u4f5c\u7528\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528exit\u51fd\u6570\u9000\u51fa\u8fdb\u7a0b\u524d\uff0cexit\u51fd\u6570\u4f1a\u6267\u884c\u7528\u6237\u5b9a\u4e49\u7684\u6e05\u7406\u51fd\u6570\u3001\u51b2\u5237\u7f13\u51b2\uff0c\u5173\u95ed\u6d41\u7b49\u64cd\u4f5c\uff0c\u7136\u540e\u518d\u7ec8\u6b62\u8fdb\u7a0b\uff0c\u800c_exit\u51fd\u6570\u4f1a\u76f4\u63a5\u7ec8\u6b62\u8fdb\u7a0b\uff0c\u4e0d\u4f1a\u505a\u4efb\u4f55\u6536\u5c3e\u5de5\u4f5c\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/image-20221129235439536.png\" alt=\"image-20221129235439536\"><\/li>\n<\/ol>\n\n\n\n<p><strong>\u8054\u7cfb\uff1a<\/strong><\/p>\n\n\n\n<p>main\u51fd\u6570\u4e2d\u6267\u884c<code>return num<\/code>\u7b49\u7528\u4e8e\u6267\u884c<code>exit(num)<\/code>\uff0c\u56e0\u4e3a\u8c03\u7528main\u51fd\u6570\u8fd0\u884c\u7ed3\u675f\u540e\uff0c\u4f1a\u5c06main\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5f53\u505aexit\u7684\u53c2\u6570\u6765\u8c03\u7528exit\u51fd\u6570<\/p>\n\n\n\n<p>\u4f7f\u7528exit\u51fd\u6570\u9000\u51fa\u8fdb\u7a0b\u524d\uff0cexit\u51fd\u6570\u4f1a\u5148\u6267\u884c\u7528\u6237\u5b9a\u4e49\u7684\u6e05\u7406\u51fd\u6570\u3001\u51b2\u5237\u7f13\u51b2\uff0c\u5173\u95ed\u6d41\u7b49\u64cd\u4f5c\uff0c\u7136\u540e\u518d\u8c03\u7528_exit\u51fd\u6570\u7ec8\u6b62\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fdb\u7a0b\u5f02\u5e38\u9000\u51fa<\/h3>\n\n\n\n<p><strong>\u60c5\u51b5\u4e00\uff1a<\/strong> \u5411\u8fdb\u7a0b\u53d1\u51fa\u4fe1\u53f7\u5bfc\u81f4\u8fdb\u7a0b\u5f02\u5e38\u9000\u51fa\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5728\u8fdb\u7a0b\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u5411\u8fdb\u7a0b\u53d1\u9001<code>kill -9<\/code>\u4fe1\u53f7\u4f7f\u5f97\u8fdb\u7a0b\u5f02\u5e38\u9000\u51fa\uff0c\u6216\u662f\u4f7f\u7528Ctrl + C\u4f7f\u5f97\u8fdb\u7a0b\u5f02\u5e38\u9000\u51fa\u7b49\u3002<\/p>\n\n\n\n<p><strong>\u60c5\u51b5\u4e8c\uff1a<\/strong> \u4ee3\u7801\u9519\u8bef\u5bfc\u81f4\u8fdb\u7a0b\u8fd0\u884c\u65f6\u5f02\u5e38\u9000\u51fa\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u4ee3\u7801\u5f53\u4e2d\u5b58\u5728\u91ce\u6307\u9488\u95ee\u9898\u4f7f\u5f97\u8fdb\u7a0b\u8fd0\u884c\u65f6\u5f02\u5e38\u9000\u51fa\uff0c\u6216\u662f\u51fa\u73b0\u4e86\u96640\u7684\u60c5\u51b5\u4f7f\u5f97\u8fdb\u7a0b\u8fd0\u884c\u65f6\u5f02\u5e38\u9000\u51fa\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fdb\u7a0b\u7b49\u5f85<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fdb\u7a0b\u7b49\u5f85\u7684\u5fc5\u8981\u6027<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5b50\u8fdb\u7a0b\u9000\u51fa\uff0c\u7236\u8fdb\u7a0b\u5982\u679c\u4e0d\u8bfb\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\uff0c\u5b50\u8fdb\u7a0b\u5c31\u4f1a\u53d8\u6210\u50f5\u5c38\u8fdb\u7a0b\uff0c\u8fdb\u800c\u9020\u6210\u5185\u5b58\u6cc4\u6f0f\u3002<\/li>\n\n\n\n<li>\u8fdb\u7a0b\u4e00\u65e6\u53d8\u6210\u50f5\u5c38\u8fdb\u7a0b\uff0c\u90a3\u4e48\u5c31\u7b97\u662fkill -9\u547d\u4ee4\u4e5f\u65e0\u6cd5\u5c06\u5176\u6740\u6b7b\uff0c\u56e0\u4e3a\u8c01\u4e5f\u65e0\u6cd5\u6740\u6b7b\u4e00\u4e2a\u5df2\u7ecf\u6b7b\u53bb\u7684\u8fdb\u7a0b\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u4e00\u4e2a\u8fdb\u7a0b\u6765\u8bf4\uff0c\u6700\u5173\u5fc3\u81ea\u5df1\u7684\u5c31\u662f\u5176\u7236\u8fdb\u7a0b\uff0c\u56e0\u4e3a\u7236\u8fdb\u7a0b\u9700\u8981\u77e5\u9053\u81ea\u5df1\u6d3e\u7ed9\u5b50\u8fdb\u7a0b\u7684\u4efb\u52a1\u5b8c\u6210\u7684\u5982\u4f55\u3002<\/li>\n\n\n\n<li>\u8fdb\u7a0b\u9700\u8981\u901a\u8fc7\u8fdb\u7a0b\u7b49\u5f85\u7684\u65b9\u5f0f\uff0c\u56de\u6536\u5b50\u8fdb\u7a0b\u8d44\u6e90\uff0c\u83b7\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u83b7\u53d6\u5b50\u8fdb\u7a0b\u7684status<\/h3>\n\n\n\n<p>\u4e0b\u9762\u8fdb\u7a0b\u7b49\u5f85\u6240\u4f7f\u7528\u7684\u4e24\u4e2a\u51fd\u6570wait\u548cwaitpid\uff0c\u90fd\u6709\u4e00\u4e2astatus\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u662f\u4e00\u4e2a\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u7531\u64cd\u4f5c\u7cfb\u7edf\u8fdb\u884c\u586b\u5145\u3002<br>\u5982\u679c\u5bf9status\u53c2\u6570\u4f20\u5165NULL\uff0c\u8868\u793a\u4e0d\u5173\u5fc3\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u72b6\u6001\u4fe1\u606f\u3002\u5426\u5219\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u901a\u8fc7\u8be5\u53c2\u6570\uff0c\u5c06\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\u53cd\u9988\u7ed9\u7236\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<p>status\u662f\u4e00\u4e2a\u6574\u578b\u53d8\u91cf\uff0c\u4f46status\u4e0d\u80fd\u7b80\u5355\u7684\u5f53\u4f5c\u6574\u578b\u6765\u770b\u5f85\uff0cstatus\u7684\u4e0d\u540c\u6bd4\u7279\u4f4d\u6240\u4ee3\u8868\u7684\u4fe1\u606f\u4e0d\u540c\uff0c\u5177\u4f53\u7ec6\u8282\u5982\u4e0b\uff08\u53ea\u7814\u7a76status\u4f4e16\u6bd4\u7279\u4f4d\uff09\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/c16ba860a2e5483182d9f168ed3a247e.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/c16ba860a2e5483182d9f168ed3a247e.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<p>\u5728status\u7684\u4f4e16\u6bd4\u7279\u4f4d\u5f53\u4e2d\uff0c\u9ad88\u4f4d\u8868\u793a\u8fdb\u7a0b\u7684\u9000\u51fa\u72b6\u6001\uff0c\u5373\u9000\u51fa\u7801\u3002\u8fdb\u7a0b\u82e5\u662f\u88ab\u4fe1\u53f7\u6240\u6740\uff0c\u5219\u4f4e7\u4f4d\u8868\u793a\u7ec8\u6b62\u4fe1\u53f7\uff0c\u800c\u7b2c8\u4f4d\u6bd4\u7279\u4f4d\u662fcore dump\u6807\u5fd7\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/5994fb9806c6b1e83c874a84d61eb824.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/5994fb9806c6b1e83c874a84d61eb824.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<p>\u6211\u4eec\u901a\u8fc7\u4e00\u7cfb\u5217\u4f4d\u64cd\u4f5c\uff0c\u5c31\u53ef\u4ee5\u6839\u636estatus\u5f97\u5230\u8fdb\u7a0b\u7684\u9000\u51fa\u7801\u548c\u9000\u51fa\u4fe1\u53f7\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>exitcode = (status &gt;&gt; 8) &amp; 0xFF;\/\/\u9000\u51fa\u7801\nexitsignal = status &amp; 0x7F;\/\/\u9000\u51fa\u4fe1\u53f7   <\/code><\/pre>\n\n\n\n<p>\u5bf9\u4e8e\u6b64\uff0c\u7cfb\u7edf\u5f53\u4e2d\u63d0\u4f9b\u4e86\u4e24\u4e2a\u5b8f\u6765\u83b7\u53d6\u9000\u51fa\u7801\u548c\u9000\u51fa\u4fe1\u53f7<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>WIFEXITED(status)\uff1a\u7528\u4e8e\u67e5\u770b\u8fdb\u7a0b\u662f\u5426\u6b63\u5e38\u9000\u51fa\uff0c\u672c\u8d28\u662f\u68c0\u67e5\u662f\u5426\u6536\u5230\u4fe1\u53f7\u3002<\/li>\n\n\n\n<li>WEXITSTATUS(status)\uff1a\u7528\u4e8e\u83b7\u53d6\u8fdb\u7a0b\u7684\u9000\u51fa\u7801<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>exitcode = WEXITSTATUS(status);\/\/\u83b7\u53d6\u9000\u51fa\u7801\nexitnormal = WIFEXITED(status);\/\/\u662f\u5426\u6b63\u5e38\u9000\u51fa<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u975e\u6b63\u5e38\u9000\u51fa\u65f6\uff0c\u8bf4\u660e\u8be5\u8fdb\u7a0b\u88ab\u4fe1\u53f7\u6240\u6740\uff0c\u90a3\u4e48\u8be5\u8fdb\u7a0b\u7684\u9000\u51fa\u7801\u4e5f\u5c31\u6ca1\u6709\u610f\u4e49\u4e86\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fdb\u7a0b\u7b49\u5f85\u7684\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">wait\u65b9\u6cd5<\/h4>\n\n\n\n<p>\u51fd\u6570\uff1a<code>pid_t wait(int* status)<\/code><\/p>\n\n\n\n<p>\u4f5c\u7528\uff1a\u7b49\u5f85\u4efb\u610f\u5b50\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a\u7b49\u5f85\u6210\u529f\u8fd4\u56de\u88ab\u7b49\u5f85\u8fdb\u7a0b\u7684pid\uff0c\u7b49\u5f85\u5931\u8d25\u8fd4\u56de-1\u3002<\/p>\n\n\n\n<p>\u53c2\u6570\uff1a\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u83b7\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u72b6\u6001\uff0c\u4e0d\u5173\u5fc3\u53ef\u8bbe\u7f6e\u4e3aNULL\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u521b\u5efa\u8fdb\u7a0b\u540e\uff0c\u7236\u8fdb\u7a0b\u53ef\u4ee5\u4f7f\u7528wait\u51fd\u6570\u4e00\u76f4\u7b49\u5f85\u5b50\u8fdb\u7a0b\uff0c\u76f4\u5230\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\u8bfb\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/wait.h&gt;\n#include &lt;sys\/types.h&gt;\nint main()\n{\n    pid_t id = fork();\n    if(id == 0){\n        \/\/child\n        int count = 10;\n        while(count--){\n            printf(\"I am child...PID:%d, PPID:%d\\n\", getpid(), getppid());\n            sleep(1);\n        }\n        exit(0);\n    }\n    \/\/father\n    int status = 0;\n    pid_t ret = wait(&amp;status);\n    if(ret &gt; 0){\n        \/\/wait success\n        printf(\"wait child success...\\n\");\n        if(WIFEXITED(status)){\n            \/\/exit normal\n            printf(\"exit code:%d\\n\", WEXITSTATUS(status));\n        }\n    }\n    sleep(3);\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u76d1\u63a7\u811a\u672c\u5bf9\u8fdb\u7a0b\u8fdb\u884c\u5b9e\u65f6\u76d1\u63a7\uff1a<\/p>\n\n\n\n<p><code>while :; do ps axj | head -1 &amp;&amp; ps axj | grep proc | grep -v grep;echo \"######################\";sleep 1;done<\/code><\/p>\n\n\n\n<p>\u8fd9\u65f6\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u5f53\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\uff0c\u7236\u8fdb\u7a0b\u8bfb\u53d6\u4e86\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\uff0c\u5b50\u8fdb\u7a0b\u4e5f\u5c31\u4e0d\u4f1a\u53d8\u6210\u50f5\u5c38\u8fdb\u7a0b\u4e86\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-16697798856757.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-16697798856757.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">waitpid\u65b9\u6cd5<\/h4>\n\n\n\n<p>\u51fd\u6570\u539f\u578b\uff1a <code>pid_t waitpid(pid_t pid, int* status, int options)<\/code><\/p>\n\n\n\n<p>\u4f5c\u7528\uff1a\u7b49\u5f85\u6307\u5b9a\u5b50\u8fdb\u7a0b\u6216\u4efb\u610f\u5b50\u8fdb\u7a0b<\/p>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b49\u5f85\u6210\u529f\u8fd4\u56de\u88ab\u7b49\u5f85\u8fdb\u7a0b\u7684PID\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u8bbe\u7f6e\u4e86\u9009\u9879WNOHANG\uff0c\u800c\u8c03\u7528waitpid\u53d1\u73b0\u6ca1\u6709\u5df2\u9000\u51fa\u7684\u5b50\u8fdb\u7a0b\u53ef\u6536\u96c6\uff0c\u5219\u8fd4\u56de0\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u8c03\u7528\u51fa\u9519\uff0c\u5219\u8fd4\u56de-1\uff0c\u8fd9\u65f6errno\u4f1a\u88ab\u8bbe\u7f6e\u6210\u76f8\u5e94\u7684\u503c\u4ee5\u6307\u793a\u9519\u8bef\u6240\u5728\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>pid\uff1a\u5f85\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7684PID\uff0c\u82e5\u8bbe\u7f6e\u6210-1\uff0c\u5219\u7b49\u5f85\u4efb\u610f\u5b50\u8fdb\u7a0b\u3002<\/li>\n\n\n\n<li>status\uff1a\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u83b7\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u72b6\u6001\uff0c\u4e0d\u5173\u5fc3\u53ef\u8bbe\u7f6e\u4e3aNULL\u3002<\/li>\n\n\n\n<li>options\uff1a\u5f53\u8bbe\u7f6e\u4e3aWNOHANG\u65f6\uff0c\u82e5\u7b49\u5f85\u7684\u5b50\u8fdb\u7a0b\u6ca1\u6709\u7ed3\u675f\uff0c\u5219waitpid\u51fd\u6570\u76f4\u63a5\u8fd4\u56de0\uff0c\u4e0d\u4e88\u4ee5\u7b49\u5f85\u3002\u82e5\u6b63\u5e38\u7ed3\u675f\uff0c\u5219\u8fd4\u56de\u5b69\u5b50\u8fdb\u7a0b\u7684PID\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f8b\u5982\uff0c\u521b\u5efa\u5b50\u8fdb\u7a0b\u540e\uff0c\u7236\u8fdb\u7a0b\u53ef\u4f7f\u7528waitpid\u51fd\u6570\u4e00\u76f4\u7b49\u5f85\u5b50\u8fdb\u7a0b\uff08\u6b64\u65f6\u5c06waitpid\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e3a0\uff09\uff0c\u76f4\u5230\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\u8bfb\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/wait.h&gt;\n#include &lt;sys\/types.h&gt;\nint main()\n{\n    pid_t id = fork();\n    if (id == 0){\n        \/\/child          \n        int count = 10;\n        while (count--){\n            printf(\"I am child...PID:%d, PPID:%d\\n\", getpid(), getppid());\n            sleep(1);\n        }\n        exit(0);\n    }\n    \/\/father           \n    int status = 0;\n    pid_t ret = waitpid(id, &amp;status, 0);\n    if (ret &gt;= 0){\n        \/\/wait success                    \n        printf(\"wait child success...\\n\");\n        if (WIFEXITED(status)){\n            \/\/exit normal                                 \n            printf(\"exit code:%d\\n\", WEXITSTATUS(status));\n        }\n        else{\n            \/\/signal killed                              \n            printf(\"killed by siganl %d\\n\", status &amp; 0x7F);\n        }\n    }\n    sleep(3);\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u7236\u8fdb\u7a0b\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528kill -9\u547d\u4ee4\u5c06\u5b50\u8fdb\u7a0b\u6740\u6b7b\uff0c\u8fd9\u65f6\u7236\u8fdb\u7a0b\u4e5f\u80fd\u7b49\u5f85\u5b50\u8fdb\u7a0b\u6210\u529f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166979167556610.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166979167556610.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u6ce8\u610f\uff1a<\/strong> \u88ab\u4fe1\u53f7\u6740\u6b7b\u800c\u9000\u51fa\u7684\u8fdb\u7a0b\uff0c\u5176\u9000\u51fa\u7801\u5c06\u6ca1\u6709\u610f\u4e49\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">\u591a\u8fdb\u7a0b\u521b\u5efa\u4ee5\u53ca\u7b49\u5f85\u7684\u4ee3\u7801\u6a21\u578b<\/h3>\n\n\n\n<p>\u4e0a\u9762\u6f14\u793a\u7684\u90fd\u662f\u7236\u8fdb\u7a0b\u521b\u5efa\u4ee5\u53ca\u7b49\u5f85\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u7684\u4f8b\u5b50\uff0c\u5b9e\u9645\u4e0a\u6211\u4eec\u8fd8\u53ef\u4ee5\u540c\u65f6\u521b\u5efa\u591a\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u7136\u540e\u8ba9\u7236\u8fdb\u7a0b\u4f9d\u6b21\u7b49\u5f85\u5b50\u8fdb\u7a0b\u9000\u51fa\uff0c\u8fd9\u53eb\u505a\u591a\u8fdb\u7a0b\u521b\u5efa\u4ee5\u53ca\u7b49\u5f85\u7684\u4ee3\u7801\u6a21\u578b\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u4e2d\u540c\u65f6\u521b\u5efa\u4e8610\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u540c\u65f6\u5c06\u5b50\u8fdb\u7a0b\u7684pid\u653e\u5165\u5230ids\u6570\u7ec4\u5f53\u4e2d\uff0c\u5e76\u5c06\u8fd910\u4e2a\u5b50\u8fdb\u7a0b\u9000\u51fa\u65f6\u7684\u9000\u51fa\u7801\u8bbe\u7f6e\u4e3a\u8be5\u5b50\u8fdb\u7a0bpid\u5728\u6570\u7ec4ids\u4e2d\u7684\u4e0b\u6807\uff0c\u4e4b\u540e\u7236\u8fdb\u7a0b\u518d\u4f7f\u7528waitpid\u51fd\u6570\u6307\u5b9a\u7b49\u5f85\u8fd910\u4e2a\u5b50\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/types.h&gt;\n#include &lt;sys\/wait.h&gt;\nint main()\n{\n    pid_t ids&#91;10];\n    for (int i = 0; i &lt; 10; i++){\n        pid_t id = fork();\n        if (id == 0){\n            \/\/child\n            printf(\"child process created successfully...PID:%d\\n\", getpid());\n            sleep(3);\n            exit(i); \/\/\u5c06\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u7801\u8bbe\u7f6e\u4e3a\u8be5\u5b50\u8fdb\u7a0bPID\u5728\u6570\u7ec4ids\u4e2d\u7684\u4e0b\u6807\n        }\n        \/\/father\n        ids&#91;i] = id;\n    }\n    for (int i = 0; i &lt; 10; i++){\n        int status = 0;\n        pid_t ret = waitpid(ids&#91;i], &amp;status, 0);\n        if (ret &gt;= 0){\n            \/\/wait child success\n            printf(\"wait child success..PID:%d\\n\", ids&#91;i]);\n            if (WIFEXITED(status)){\n                \/\/exit normal\n                printf(\"exit code:%d\\n\", WEXITSTATUS(status));\n            }\n            else{\n                \/\/signal killed\n                printf(\"killed by signal %d\\n\", status &amp; 0x7F);\n            }\n        }\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u4ee3\u7801\uff0c\u8fd9\u65f6\u6211\u4eec\u4fbf\u53ef\u4ee5\u770b\u5230\u7236\u8fdb\u7a0b\u540c\u65f6\u521b\u5efa\u591a\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u5f53\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\uff0c\u7236\u8fdb\u7a0b\u518d\u4f9d\u6b21\u8bfb\u53d6\u8fd9\u4e9b\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166979471634213.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166979471634213.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u4e8e\u975e\u963b\u585e\u63a5\u53e3\u7684\u8f6e\u8be2\u68c0\u6d4b\u65b9\u6848<\/h3>\n\n\n\n<p>\u4e0a\u8ff0\u6240\u7ed9\u7684\u4f8b\u5b50\u4e2d\uff0c\u5f53\u5b50\u8fdb\u7a0b\u672a\u9000\u51fa\u65f6\uff0c\u7236\u8fdb\u7a0b\u4e00\u76f4\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\uff0c\u5728\u7b49\u5f85\u671f\u95f4\uff0c\u7236\u8fdb\u7a0b\u4e0d\u80fd\u505a\u4efb\u4f55\u4e8b\u60c5\uff0c\u8fd9\u79cd\u7b49\u5f85\u53eb\u505a\u963b\u585e\u7b49\u5f85\u3002<\/p>\n\n\n\n<p>\u5b9e\u9645\u4e0a\u6211\u4eec\u53ef\u4ee5\u8ba9\u7236\u8fdb\u7a0b\u4e00\u76f4\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\uff0c\u800c\u662f\u5f53\u5b50\u8fdb\u7a0b\u672a\u9000\u51fa\u65f6\u7236\u8fdb\u7a0b\u53ef\u4ee5\u505a\u4e00\u4e9b\u81ea\u5df1\u7684\u4e8b\u60c5\uff0c\u5f53\u5b50\u8fdb\u7a0b\u9000\u51fa\u65f6\u518d\u8bfb\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\uff0c\u5373\u975e\u963b\u585e\u7b49\u5f85\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u505a\u6cd5\u5f88\u7b80\u5355\uff0c\u5411waitpid\u51fd\u6570\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570options\u4f20\u5165WNOHANG\uff0c\u8fd9\u6837\u4e00\u6765\uff0c\u7b49\u5f85\u7684\u5b50\u8fdb\u7a0b\u82e5\u662f\u6ca1\u6709\u7ed3\u675f\uff0c\u90a3\u4e48waitpid\u51fd\u6570\u5c06\u76f4\u63a5\u8fd4\u56de0\uff0c\u4e0d\u4e88\u4ee5\u4efb\u4f55\u7b49\u5f85\u3002\u800c\u7b49\u5f85\u7684\u5b50\u8fdb\u7a0b\u82e5\u662f\u6b63\u5e38\u7ed3\u675f\uff0c\u5219\u8fd4\u56de\u8be5\u8fdb\u7a0b\u7684pid\u3002<\/p>\n<\/blockquote>\n\n\n\n<p>\u4f8b\u5982\uff0c\u7236\u8fdb\u7a0b\u53ef\u4ee5\u9694\u4e00\u6bb5\u65f6\u95f4\u8c03\u7528\u4e00\u6b21waitpid\u51fd\u6570\uff0c\u82e5\u662f\u7b49\u5f85\u7684\u5b50\u8fdb\u7a0b\u5c1a\u672a\u9000\u51fa\uff0c\u5219\u7236\u8fdb\u7a0b\u53ef\u4ee5\u5148\u53bb\u505a\u4e00\u4e9b\u5176\u4ed6\u7684\u4e8b\u60c5\uff0c\u8fc7\u4e00\u6bb5\u65f6\u95f4\u518d\u8c03\u7528waitpid\u51fd\u6570\u8bfb\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/types.h&gt;\n#include &lt;sys\/wait.h&gt;\nint main()\n{\n    pid_t id = fork();\n    if (0 == id) \n    {   \n        int count = 3;\n        while (count--)\n        {   \n            printf(\"child do something...PID:%d PPID:%d\\n\", getpid(), getppid());\n            sleep(3);\n        }   \n        exit(0);\n    }   \n\n    while (1) \n    {   \n        int status = 0;\n        int ret = waitpid(id, &amp;status, WNOHANG);\n        if (ret &gt; 0)\n        {   \n            printf(\"wait child success...\\n\");\n            if (WIFEXITED(status))\n            {   \n                printf(\"exit code...:%d\\n\", WEXITSTATUS(status));\n                break;\n            }\n        }\n        else if (0 == ret)\n        {\n            printf(\"father do other things...\\n\");\n            sleep(1);\n        }\n        else\n        {\n            printf(\"waitpid error...\\n\");\n            break;\n        }\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\u5c31\u662f\uff0c\u7236\u8fdb\u7a0b\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u5c31\u53bb\u67e5\u770b\u5b50\u8fdb\u7a0b\u662f\u5426\u9000\u51fa\uff0c\u82e5\u672a\u9000\u51fa\uff0c\u5219\u7236\u8fdb\u7a0b\u5148\u53bb\u5fd9\u81ea\u5df1\u7684\u4e8b\u60c5\uff0c\u8fc7\u4e00\u6bb5\u65f6\u95f4\u518d\u6765\u67e5\u770b\uff0c\u76f4\u5230\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\u8bfb\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166979933036516.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166979933036516.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fdb\u7a0b\u7a0b\u5e8f\u7684\u66ff\u6362<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u66ff\u6362\u539f\u7406<\/h3>\n\n\n\n<p>\u5f53fork\u521b\u5efa\u5b50\u8fdb\u7a0b\u540e\uff0c\u5b50\u8fdb\u7a0b\u6267\u884c\u7684\u662f\u548c\u7236\u8fdb\u7a0b\u76f8\u540c\u7684\u7a0b\u5e8f\uff08\u4f46\u6709\u53ef\u80fd\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5206\u652f\uff09\uff0c\u82e5\u60f3\u8981\u5b50\u8fdb\u7a0b\u6267\u884c\u53e6\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u5f80\u5f80\u9700\u8981\u8c03\u7528\u4e00\u79cdexec\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u5f53\u8fdb\u7a0b\u8c03\u7528\u4e00\u79cdexec\u51fd\u6570\u65f6\uff0c\u8be5\u8fdb\u7a0b\u7684\u7528\u6237\u4ee3\u7801\u7a7a\u95f4\u548c\u6570\u636e\u5b8c\u5168\u88ab\u65b0\u7a0b\u5e8f\u66ff\u6362\uff0c\u5e76\u4ece\u65b0\u7a0b\u5e8f\u7684\u542f\u52a8\u4f8b\u7a0b\u5f00\u59cb\u6267\u884c\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166979971895919.png\" alt=\"img\"><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u5f53\u8fdb\u884c\u8fdb\u7a0b\u66ff\u6362\u65f6\uff0c\u6709\u6ca1\u6709\u521b\u5efa\u65b0\u7684\u8fdb\u7a0b\uff1f<\/p>\n<\/blockquote>\n\n\n\n<p>\u8fdb\u7a0b\u7a0b\u5e8f\u66ff\u6362\u4e4b\u540e\uff0c\u8be5\u8fdb\u7a0b\u5bf9\u5e94\u7684PCB\uff0c\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\u4ee5\u53ca\u9875\u8868\u7b49\u6570\u636e\u7ed3\u6784\u90fd\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u53ea\u662f\u8fdb\u7a0b\u5728\u7269\u7406\u5185\u5b58\u4e2d\u7684\u6570\u636e\u548c\u4ee3\u7801\u53d1\u751f\u4e86\u6539\u53d8\uff0c\u6240\u4ee5\u5e76\u6ca1\u6709\u521b\u5efa\u65b0\u7684\u8fdb\u7a0b\uff0c\u800c\u4e14\u8fdb\u7a0b\u7a0b\u5e8f\u66ff\u6362\u524d\u540e\u8be5\u8fdb\u7a0b\u7684pid\u5e76\u6ca1\u6709\u6539\u53d8\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u5b50\u8fdb\u7a0b\u8fdb\u884c\u8fdb\u7a0b\u7a0b\u5e8f\u66ff\u6362\u540e\uff0c\u4f1a\u5f71\u54cd\u7236\u8fdb\u7a0b\u7684\u4ee3\u7801\u548c\u6570\u636e\u5417\uff1f<\/p>\n<\/blockquote>\n\n\n\n<p>\u5b50\u8fdb\u7a0b\u521a\u88ab\u521b\u5efa\u65f6\uff0c\u4e0e\u7236\u8fdb\u7a0b\u5171\u4eab\u4ee3\u7801\u548c\u6570\u636e\uff0c\u4f46\u5f53\u5b50\u8fdb\u7a0b\u9700\u8981\u8fdb\u884c\u8fdb\u7a0b\u7a0b\u5e8f\u66ff\u6362\u65f6\uff0c\u4e5f\u5c31\u610f\u5473\u7740\u5b50\u8fdb\u7a0b\u9700\u8981\u5bf9\u5176\u6570\u636e\u548c\u4ee3\u7801\u8fdb\u884c\u5199\u5165\u64cd\u4f5c\uff0c\u8fd9\u65f6\u4fbf\u9700\u8981\u5c06\u7236\u5b50\u8fdb\u7a0b\u5171\u4eab\u7684\u4ee3\u7801\u548c\u6570\u636e\u8fdb\u884c\u5199\u65f6\u62f7\u8d1d\uff0c\u6b64\u540e\u7236\u5b50\u8fdb\u7a0b\u7684\u4ee3\u7801\u548c\u6570\u636e\u4e5f\u5c31\u5206\u79bb\u4e86\uff0c\u56e0\u6b64\u5b50\u8fdb\u7a0b\u8fdb\u884c\u7a0b\u5e8f\u66ff\u6362\u540e\u4e0d\u4f1a\u5f71\u54cd\u7236\u8fdb\u7a0b\u7684\u4ee3\u7801\u548c\u6570\u636e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u66ff\u6362\u51fd\u6570<\/h3>\n\n\n\n<p>\u66ff\u6362\u51fd\u6570\u67096\u79cd\u4ee5exec\u5f00\u5934\u7684\u51fd\u6570\uff0c\u5b83\u4eec\u7edf\u79f0\u4e3aexec\u51fd\u6570\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u4e00\u4e2a<\/h4>\n\n\n\n<p><code>int execl(const char* path,const char* arg,...)<\/code><\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u6267\u884c\u7a0b\u5e8f\u7684\u8def\u5f84\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u53ef\u53d8\u53c2\u6570\u5217\u8868\uff0c\u8868\u793a\u4f60\u8981\u5982\u4f55\u6267\u884c\u8fd9\u4e2a\u7a0b\u5e8f\uff0c\u5e76\u4ee5NULL\u7ed3\u5c3e\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u793a\u4f8b\uff1a\u8981\u6267\u884cls\u7a0b\u5e8f<\/p>\n\n\n\n<p><code>execl(\"\/usr\/bin\/ls\", \"ls\", \"-a\", \"-i\", \"-l\", NULL)<\/code><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u4e8c\u4e2a<\/h4>\n\n\n\n<p><code>int execlp(const char* file,const char* arg,...)<\/code><\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u6267\u884c\u7a0b\u5e8f\u7684\u540d\u5b57\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u53ef\u53d8\u53c2\u6570\u5217\u8868\uff0c\u8868\u793a\u4f60\u8981\u5982\u4f55\u6267\u884c\u8fd9\u4e2a\u7a0b\u5e8f\uff0c\u5e76\u4ee5NULL\u7ed3\u5c3e\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u793a\u4f8b\uff1a\u8981\u6267\u884cls\u7a0b\u5e8f<\/p>\n\n\n\n<p><code>execlp(\"ls\", \"ls\", \"-a\", \"-i\", \"-l\", NULL)<\/code><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u4e09\u4e2a<\/h4>\n\n\n\n<p><code>int execle(const char* path, const char* arg,...,char* const envp[])<\/code><\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u6267\u884c\u7684\u7a0b\u5e8f\u8def\u5f84\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u53ef\u53d8\u53c2\u6570\u5217\u8868\uff0c\u8868\u793a\u4f60\u8981\u5982\u4f55\u6267\u884c\u8fd9\u4e2a\u7a0b\u5e8f\uff0c\u5e76\u4ee5NULL\u7ed3\u5c3e\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u4f60\u81ea\u5df1\u8bbe\u7f6e\u7684\u73af\u5883\u53d8\u91cf\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u793a\u4f8b\uff1a\u4f60\u8bbe\u7f6e\u4e86MYVAL\u73af\u5883\u53d8\u91cf\uff0c\u5728mycmd\u7a0b\u5e8f\u5185\u90e8\u5c31\u53ef\u4ee5\u4f7f\u7528\u8be5\u73af\u5883\u53d8\u91cf\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>char* myenvp&#91;] = {\"MYVAL=2021\", NULL};\nexecle(\".\/mycmd\", \"mycmd\", NULL, myenvp);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u56db\u4e2a<\/h4>\n\n\n\n<p><code>int execv(const char* path, char* const argv[])<\/code><\/p>\n\n\n\n<p>\u53c2\u6570:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u6267\u884c\u7a0b\u5e8f\u7684\u8def\u5f84\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\uff0c\u6570\u7ec4\u5f53\u4e2d\u7684\u5185\u5bb9\u8868\u793a\u4f60\u8981\u5982\u4f55\u6267\u884c\u8fd9\u4e2a\u7a0b\u5e8f\uff0c\u6570\u7ec4\u4ee5NULL\u7ed3\u5c3e\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u793a\u4f8b\uff1a\u8981\u6267\u884cls\u7a0b\u5e8f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>char* myargv&#91;] = {\"ls\", \"-a\", \"-i\", \"-l\", NULL};\nexecv(\"\/usr\/bin\/ls\", myargv);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u4e94\u4e2a<\/h4>\n\n\n\n<p><code>int execvp(const char* file,char* const argv[])<\/code><\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u6267\u884c\u7a0b\u5e8f\u7684\u540d\u5b57\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\uff0c\u6570\u7ec4\u5f53\u4e2d\u7684\u5185\u5bb9\u8868\u793a\u4f60\u8981\u5982\u4f55\u6267\u884c\u8fd9\u4e2a\u7a0b\u5e8f\uff0c\u6570\u7ec4\u4ee5NULL\u7ed3\u5c3e\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u793a\u4f8b\uff1a\u8981\u6267\u884cls\u7a0b\u5e8f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>char* myargv&#91;] = {\"ls\", \"-a\", \"-i\", \"-l\", NULL};\nexecvp(\"ls\", myargv);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u516d\u4e2a<\/h4>\n\n\n\n<p><code>int execve(const char* path, char* const argv[],char* const envp[])<\/code><\/p>\n\n\n\n<p>\u53c2\u6570\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u6267\u884c\u7a0b\u5e8f\u7684\u8def\u5f84\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\uff0c\u6570\u7ec4\u5f53\u4e2d\u7684\u5185\u5bb9\u8868\u793a\u4f60\u8981\u5982\u4f55\u6267\u884c\u8fd9\u4e2a\u7a0b\u5e8f\uff0c\u6570\u7ec4\u4ee5NULL\u7ed3\u5c3e\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u4f60\u81ea\u5df1\u8bbe\u7f6e\u7684\u73af\u5883\u53d8\u91cf\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u793a\u4f8b\uff1a\u4f60\u8bbe\u7f6e\u4e86MYVAL\u73af\u5883\u53d8\u91cf\uff0c\u5728mycmd\u7a0b\u5e8f\u5185\u90e8\u5c31\u53ef\u4ee5\u4f7f\u7528\u8be5\u73af\u5883\u53d8\u91cf\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>char* myargv&#91;] = {\"mycmd\", NULL};\nchar* myenvp&#91;] = {\"MYVAL=2021\", NULL};\nexecve(\".\/mycmd\", myargv, myenvp);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u51fd\u6570\u89e3\u91ca<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e9b\u51fd\u6570\u5982\u679c\u8c03\u7528\u6210\u529f\uff0c\u5219\u52a0\u8f7d\u6307\u5b9a\u7684\u7a0b\u5e8f\u5e76\u4ece\u8d77\u59cb\u4ee3\u7801\u5f00\u59cb\u6267\u884c\uff0c\u4e0d\u518d\u8fd4\u56de\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u8c03\u7528\u51fa\u9519\uff0c\u5219\u8fd4\u56de-1\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0cexec\u7cfb\u5217\u51fd\u6570\u53ea\u8981\u8fd4\u56de\u4e86\uff0c\u5c31\u610f\u5473\u7740\u8c03\u7528\u5931\u8d25\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u547d\u540d\u7406\u89e3<\/h3>\n\n\n\n<p>\u8fd9\u516d\u4e2aexec\u7cfb\u5217\u51fd\u6570\u7684\u51fd\u6570\u540d\u90fd\u5df2exec\u5f00\u5934\uff0c\u5176\u540e\u7f00\u7684\u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>l(list)\uff1a\u8868\u793a\u53c2\u6570\u91c7\u7528\u5217\u8868\u7684\u5f62\u5f0f\u3002<\/li>\n\n\n\n<li>v(vector)\uff1a\u8868\u793a\u53c2\u6570\u91c7\u7528\u6570\u7ec4\u7684\u5f62\u5f0f\u3002<\/li>\n\n\n\n<li>p(path)\uff1a\u8868\u793a\u80fd\u81ea\u52a8\u641c\u7d22\u73af\u5883\u53d8\u91cfPATH\uff0c\u8fdb\u884c\u7a0b\u5e8f\u67e5\u627e\u3002<\/li>\n\n\n\n<li>e(env)\uff1a\u8868\u793a\u53ef\u4ee5\u4f20\u5165\u81ea\u5df1\u7684\u8bbe\u7f6e\u7684\u73af\u5883\u53d8\u91cf\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u51fd\u6570\u540d<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u53c2\u6570\u683c\u5f0f<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u662f\u5426\u5e26\u8def\u5f84<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u662f\u5426\u4f7f\u7528\u5f53\u524d\u73af\u5883\u53d8\u91cf<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">execl<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5217\u8868<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">execlp<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5217\u8868<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">execle<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5217\u8868<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426\uff0c\u9700\u81ea\u5df1\u7ec4\u88c5\u73af\u5883\u53d8\u91cf<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">execv<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6570\u7ec4<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">execvp<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6570\u7ec4<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">execve<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6570\u7ec4<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426\uff0c\u9700\u81ea\u5df1\u7ec4\u88c5\u73af\u5883\u53d8\u91cf<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u4e8b\u5b9e\u4e0a\uff0c\u53ea\u6709execve\u624d\u662f\u771f\u6b63\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u5176\u5b83\u4e94\u4e2a\u51fd\u6570\u6700\u7ec8\u90fd\u662f\u8c03\u7528\u7684execve\uff0c\u6240\u4ee5execve\u5728man\u624b\u518c\u7684\u7b2c\u4e8c\u8282\uff0c\u800c\u5176\u5b83\u4e94\u4e2a\u51fd\u6570\u5728man\u624b\u518c\u7684\u7b2c\u4e09\u8282\uff0c\u4e5f\u5c31\u662f\u8bf4\u5176\u4ed6\u4e94\u4e2a\u51fd\u6570\u5b9e\u9645\u4e0a\u662f\u5bf9\u7cfb\u7edf\u8c03\u7528execve\u8fdb\u884c\u4e86\u5c01\u88c5\uff0c\u4ee5\u6ee1\u8db3\u4e0d\u540c\u7528\u6237\u7684\u4e0d\u540c\u8c03\u7528\u573a\u666f\u3002<\/p>\n\n\n\n<p>\u4e0b\u56fe\u4e3aexec\u7cfb\u5217\u51fd\u6570\u65cf\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166980823422622.png\" alt=\"img\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u505a\u4e00\u4e2a\u7b80\u6613\u7684shell<\/h2>\n\n\n\n<p>shell\u4e5f\u5c31\u662f\u547d\u4ee4\u884c\u89e3\u91ca\u5668\uff0c\u5176\u8fd0\u884c\u539f\u7406\u5c31\u662f\uff1a\u5f53\u6709\u547d\u4ee4\u9700\u8981\u6267\u884c\u65f6\uff0cshell\u521b\u5efa\u5b50\u8fdb\u7a0b\uff0c\u8ba9\u5b50\u8fdb\u7a0b\u6267\u884c\u547d\u4ee4\uff0c\u800cshell\u53ea\u9700\u7b49\u5f85\u5b50\u8fdb\u7a0b\u9000\u51fa\u5373\u53ef\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAMjAyMWRyYWdvbg==,size_20,color_FFFFFF,t_70,g_se,x_16-166980923364525.png\" alt=\"img\"><\/p>\n\n\n\n<p>\u5176\u5b9eshell\u9700\u8981\u6267\u884c\u7684\u903b\u8f91\u975e\u5e38\u7b80\u5355\uff0c\u5176\u53ea\u9700\u5faa\u73af\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u83b7\u53d6\u547d\u4ee4\u884c\u3002<\/li>\n\n\n\n<li>\u89e3\u6790\u547d\u4ee4\u884c\u3002<\/li>\n\n\n\n<li>\u521b\u5efa\u5b50\u8fdb\u7a0b\u3002<\/li>\n\n\n\n<li>\u66ff\u6362\u5b50\u8fdb\u7a0b\u3002<\/li>\n\n\n\n<li>\u7b49\u5f85\u5b50\u8fdb\u7a0b\u9000\u51fa\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u5176\u4e2d\uff0c\u521b\u5efa\u5b50\u8fdb\u7a0b\u4f7f\u7528fork\u51fd\u6570\uff0c\u66ff\u6362\u5b50\u8fdb\u7a0b\u4f7f\u7528exec\u7cfb\u5217\u51fd\u6570\uff0c\u7b49\u5f85\u5b50\u8fdb\u7a0b\u4f7f\u7528wait\u6216\u8005waitpid\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u4e8e\u662f\u6211\u4eec\u53ef\u4ee5\u5f88\u5bb9\u6613\u5b9e\u73b0\u4e00\u4e2a\u7b80\u6613\u7684shell\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;pwd.h&gt;\n#include &lt;string.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;stdlib.h&gt;\n#include &lt;sys\/types.h&gt;\n#include &lt;sys\/wait.h&gt;\n#define LEN 1024 \/\/\u547d\u4ee4\u6700\u5927\u957f\u5ea6\n#define NUM 32 \/\/\u547d\u4ee4\u62c6\u5206\u540e\u7684\u6700\u5927\u4e2a\u6570\nint main()\n{\n    char cmd&#91;LEN]; \/\/\u5b58\u50a8\u547d\u4ee4\n    char* myargv&#91;NUM]; \/\/\u5b58\u50a8\u547d\u4ee4\u62c6\u5206\u540e\u7684\u7ed3\u679c\n    char hostname&#91;32]; \/\/\u4e3b\u673a\u540d\n    char pwd&#91;128]; \/\/\u5f53\u524d\u76ee\u5f55\n    while (1){\n        \/\/\u83b7\u53d6\u547d\u4ee4\u63d0\u793a\u4fe1\u606f\n        struct passwd* pass = getpwuid(getuid());\n        gethostname(hostname, sizeof(hostname)-1);\n        getcwd(pwd, sizeof(pwd)-1);\n        int len = strlen(pwd);\n        char* p = pwd + len - 1;\n        while (*p != '\/'){\n            p--;\n        }\n        p++;\n        \/\/\u6253\u5370\u547d\u4ee4\u63d0\u793a\u4fe1\u606f\n        printf(\"&#91;%s@%s %s]$ \", pass-&gt;pw_name, hostname, p);\n        \/\/\u8bfb\u53d6\u547d\u4ee4\n        fgets(cmd, LEN, stdin);\n        cmd&#91;strlen(cmd) - 1] = '\\0';\n        \/\/\u62c6\u5206\u547d\u4ee4\n        myargv&#91;0] = strtok(cmd, \" \");\n        int i = 1;\n        while (myargv&#91;i] = strtok(NULL, \" \")){\n            i++;\n        }\n        pid_t id = fork(); \/\/\u521b\u5efa\u5b50\u8fdb\u7a0b\u6267\u884c\u547d\u4ee4\n        if (id == 0){\n            \/\/child\n            execvp(myargv&#91;0], myargv); \/\/child\u8fdb\u884c\u7a0b\u5e8f\u66ff\u6362\n            exit(1); \/\/\u66ff\u6362\u5931\u8d25\u7684\u9000\u51fa\u7801\u8bbe\u7f6e\u4e3a1\n        }\n        \/\/shell\n        int status = 0;\n        pid_t ret = waitpid(id, &amp;status, 0); \/\/shell\u7b49\u5f85child\u9000\u51fa\n        if (ret &gt; 0){\n            printf(\"exit code:%d\\n\", WEXITSTATUS(status)); \/\/\u6253\u5370child\u7684\u9000\u51fa\u7801\n        }\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u6548\u679c\u5c55\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/d1543c7211f246b4aebb5e51acd9ea8b.gif'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/d1543c7211f246b4aebb5e51acd9ea8b.gif\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u6ce8\u610f\uff1a<\/strong> \u5f53\u6267\u884c<code>.\/myshell<\/code>\u547d\u4ee4\u540e\uff0c\u4fbf\u662f\u6211\u4eec\u81ea\u5df1\u5b9e\u73b0\u7684shell\u5728\u8fdb\u884c\u547d\u4ee4\u884c\u89e3\u91ca\uff0c\u6211\u4eec\u81ea\u5df1\u5b9e\u73b0\u7684shell\u5728\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\u90fd\u6253\u5370\u4e86\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u8fd9\u4e00\u70b9\u6765\u533a\u5206\u6211\u4eec\u5f53\u524d\u4f7f\u7528\u7684\u662fLinux\u64cd\u4f5c\u7cfb\u7edf\u7684shell\u8fd8\u662f\u6211\u4eec\u81ea\u5df1\u5b9e\u73b0\u7684shell\u3002<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\u8fdb\u7a0b\u521b\u5efa fork\u51fd\u6570\u521d\u59cb \u5728Linux\u4e2d\uff0cfork\u51fd\u6570\u662f\u975e\u5e38\u91cd\u8981\u7684\u51fd\u6570\uff0c\u5b83\u4ece\u5df2\u5b58\u5728\u8fdb\u7a0b\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u8fdb\u7a0b\u3002\u65b0\u8fdb [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,1],"tags":[27],"class_list":["post-143","post","type-post","status-publish","format-standard","hentry","category-linux","category-learn","tag-27"],"_links":{"self":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts\/143","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=143"}],"version-history":[{"count":2,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts\/143\/revisions"}],"predecessor-version":[{"id":145,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts\/143\/revisions\/145"}],"wp:attachment":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}