{"id":114656,"date":"2024-03-22T23:39:03","date_gmt":"2024-03-22T14:39:03","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%ae-wait-%e9%96%a2%e6%95%b0%e3%81%a8-waitpid-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%ef%bc%9f\/"},"modified":"2024-03-28T08:16:43","modified_gmt":"2024-03-27T23:16:43","slug":"linux-%e3%81%ae-wait-%e9%96%a2%e6%95%b0%e3%81%a8-waitpid-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%ae-wait-%e9%96%a2%e6%95%b0%e3%81%a8-waitpid-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%ef%bc%9f\/","title":{"rendered":"Linux \u306e wait() \u95a2\u6570\u3068 waitpid() \u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306f\uff1f"},"content":{"rendered":"<p>Linux \u3067\u306f\u3001\u5b50\u30d7\u30ed\u30bb\u30b9\u306e\u7d42\u4e86\u3092\u5f85\u6a5f\u3059\u308b\u305f\u3081\u306b wait \u95a2\u6570\u3068 waitpid \u95a2\u6570\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>wait()\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">pid_t<\/span> <span class=\"hljs-title function_\">wait<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> *status)<\/span>;\r\n<\/code><\/pre>\n<p>status\u306f\u6574\u6570\u5909\u6570\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u3067\u060c \u5b50\u30d7\u30ed\u30bb\u30b9\u306e\u7d42\u4e86\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u683c\u7d0d\u3059\u308b\u3002\u3053\u306e\u95a2\u6570\u306f\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u7d42\u4e86\u3059\u308b\u307e\u3067\u547c\u3073\u51fa\u3057\u30d7\u30ed\u30bb\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3002\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u3059\u3067\u306b\u7d42\u4e86\u3057\u3066\u3044\u308c\u3070\uff0c\u305d\u306e\u7d42\u4e86\u30b9\u30c6\u30fc\u30bf\u30b9\u306f\u5373\u5ea7\u306b\u8fd4\u3055\u308c\u308b\u3002\u547c\u3073\u51fa\u3057\u30d7\u30ed\u30bb\u30b9\u306b\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u3044\u306a\u3044\u304b\uff0c\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u3059\u3067\u306b\u5225\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u3063\u3066\u5f85\u305f\u308c\u3066\u3044\u308b\u5834\u5408\uff0cwait() \u95a2\u6570\u306f\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\u3002<\/p>\n<p>waitpid() \u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">pid_t<\/span> <span class=\"hljs-title function_\">waitpid<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">pid_t<\/span> pid, <span class=\"hljs-type\">int<\/span> *status, <span class=\"hljs-type\">int<\/span> options)<\/span>;\r\n<\/code><\/pre>\n<p>pid \u306f\u5f85\u6a5f\u4e2d\u306e\u5b50\u30d7\u30ed\u30bb\u30b9\u306e\u30d7\u30ed\u30bb\u30b9 ID \u3067\u3059\u3002-1 \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u4efb\u610f\u306e\u5b50\u30d7\u30ed\u30bb\u30b9\u306e\u5f85\u6a5f\u304c\u3067\u304d\u307e\u3059\u3002status \u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u306f\u5b50\u30d7\u30ed\u30bb\u30b9\u306e\u7d42\u4e86\u30b9\u30c6\u30fc\u30bf\u30b9\u304c\u683c\u7d0d\u3055\u308c\u307e\u3059\u3002options \u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u306f\u3001WNOHANG \u306e\u3088\u3046\u306b\u30d6\u30ed\u30c3\u30af\u3057\u306a\u3044\u5f85\u6a5f\u3092\u6307\u5b9a\u3059\u308b\u306a\u3069\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>waitpid()\u95a2\u6570\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u7d42\u4e86\u3059\u308b\u307e\u3067\u547c\u3073\u51fa\u3057\u5074\u30d7\u30ed\u30bb\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3057\u307e\u3059\u3002\u6307\u5b9a\u3055\u308c\u305f\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u3059\u3067\u306b\u7d42\u4e86\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u306e\u7d42\u4e86\u30b9\u30c6\u30fc\u30bf\u30b9\u306f\u3059\u3050\u306b\u8fd4\u3055\u308c\u307e\u3059\u3002\u547c\u3073\u51fa\u3057\u5074\u30d7\u30ed\u30bb\u30b9\u3067\u6307\u5b9a\u3055\u308c\u305f\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u3044\u306a\u3044\u5834\u5408\u3001\u307e\u305f\u306f\u6307\u5b9a\u3055\u308c\u305f\u5b50\u30d7\u30ed\u30bb\u30b9\u304c\u4ed6\u306e\u30d7\u30ed\u30bb\u30b9\u3067\u5f85\u6a5f\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001waitpid()\u95a2\u6570\u306f\u3059\u3050\u306b\u30a8\u30e9\u30fc\u3092\u8fd4\u3057\u3066-1\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>wait()\u95a2\u6570\u306e\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdlib.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/types.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/wait.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;unistd.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">pid_t<\/span> pid;\r\n    <span class=\"hljs-type\">int<\/span> status;\r\n\r\n    pid = fork();\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (pid == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-comment\">\/\/ \u5b50\u8fdb\u7a0b<\/span>\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u5b50\u8fdb\u7a0b\u5f00\u59cb\u8fd0\u884c\\n\"<\/span>);\r\n        sleep(<span class=\"hljs-number\">3<\/span>);\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u5b50\u8fdb\u7a0b\u7ed3\u675f\\n\"<\/span>);\r\n        <span class=\"hljs-built_in\">exit<\/span>(<span class=\"hljs-number\">0<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (pid &gt; <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-comment\">\/\/ \u7236\u8fdb\u7a0b<\/span>\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u7236\u8fdb\u7a0b\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ec8\u6b62\\n\"<\/span>);\r\n        wait(&amp;status);\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u5b50\u8fdb\u7a0b\u7ec8\u6b62\\n\"<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ fork\u5931\u8d25<\/span>\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"fork\u5931\u8d25\\n\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u4f8b\uff1a\u4ee5\u4e0b\u306b waitpid() \u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdlib.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/types.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/wait.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;unistd.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">pid_t<\/span> pid;\r\n    <span class=\"hljs-type\">int<\/span> status;\r\n\r\n    pid = fork();\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (pid == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-comment\">\/\/ \u5b50\u8fdb\u7a0b<\/span>\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u5b50\u8fdb\u7a0b\u5f00\u59cb\u8fd0\u884c\\n\"<\/span>);\r\n        sleep(<span class=\"hljs-number\">3<\/span>);\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u5b50\u8fdb\u7a0b\u7ed3\u675f\\n\"<\/span>);\r\n        <span class=\"hljs-built_in\">exit<\/span>(<span class=\"hljs-number\">0<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (pid &gt; <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-comment\">\/\/ \u7236\u8fdb\u7a0b<\/span>\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u7236\u8fdb\u7a0b\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ec8\u6b62\\n\"<\/span>);\r\n        waitpid(pid, &amp;status, <span class=\"hljs-number\">0<\/span>);\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u5b50\u8fdb\u7a0b\u7ec8\u6b62\\n\"<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ fork\u5931\u8d25<\/span>\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"fork\u5931\u8d25\\n\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u89aa\u30d7\u30ed\u30bb\u30b9\u306f\u5b50\u30d7\u30ed\u30bb\u30b9\u306e\u7d42\u4e86\u3092\u5f85\u3061\u3001\u305d\u306e\u5f8c\u3001\u305d\u308c\u306b\u5fdc\u3058\u3066\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux \u3067\u306f\u3001\u5b50\u30d7\u30ed\u30bb\u30b9\u306e\u7d42\u4e86\u3092\u5f85\u6a5f\u3059\u308b\u305f\u3081\u306b wait \u95a2\u6570\u3068 waitpid \u95a2\u6570\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002 wait()\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 pid_t wait(int *status); status\u306f [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-114656","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux \u306e wait() \u95a2\u6570\u3068 waitpid() \u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306f\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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