{"id":707,"date":"2021-05-04T00:39:34","date_gmt":"2021-05-03T16:39:34","guid":{"rendered":"https:\/\/blog.iyatt.com\/?p=707"},"modified":"2024-05-05T14:19:36","modified_gmt":"2024-05-05T06:19:36","slug":"%e8%bf%9b%e7%a8%8b%e9%97%b4%e9%80%9a%e4%bf%a1","status":"publish","type":"post","link":"https:\/\/blog.iyatt.com\/?p=707","title":{"rendered":"\u8fdb\u7a0b\u95f4\u901a\u4fe1"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span 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href=\"https:\/\/blog.iyatt.com\/?p=707\/#%E8%BF%9B%E7%A8%8B%E9%97%B4%E9%80%9A%E4%BF%A1%E6%A6%82%E8%BF%B0\" >\u8fdb\u7a0b\u95f4\u901a\u4fe1\u6982\u8ff0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.iyatt.com\/?p=707\/#%E7%AE%A1%E9%81%93%E9%80%9A%E4%BF%A1\" >\u7ba1\u9053\u901a\u4fe1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.iyatt.com\/?p=707\/#%E4%BF%A1%E5%8F%B7\" >\u4fe1\u53f7<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.iyatt.com\/?p=707\/#%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97\" >\u6d88\u606f\u961f\u5217<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>\u4e00\u4e2a\u5927\u578b\u5e94\u7528\u7a0b\u5e8f\uff0c\u5f80\u5f80\u9700\u8981\u4f17\u591a\u8fdb\u7a0b\u534f\u4f5c\uff0c\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u91cd\u8981\u6027\u663e\u800c\u6613\u89c1\u3002Linux 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IPC\u201c\uff0c\u901a\u4fe1\u8fdb\u7a0b\u5c40\u9650\u5728\u5355\u4e2a\u8ba1\u7b97\u673a\u5185\uff1b\u540e\u8005\u5219\u8df3\u8fc7\u4e86\u8be5\u9650\u5236\uff0c\u5f62\u6210\u4e86\u57fa\u4e8e\u5957\u63a5\u5b57\uff08Socket\uff09\u7684\u8fdb\u7a0b\u901a\u4fe1\u673a\u5236\u3002\u5176\u4e2d UNIX IPC \u5305\u62ec\u7ba1\u9053\uff0cFIFO \u548c\u4fe1\u53f7\uff0cSystem V IPC \u5305\u62ec System V \u6d88\u606f\u961f\u5217\u3001System V \u4fe1\u53f7\u706f\u548c System V \u5171\u4eab\u5185\u5b58\u533a\uff0cPosix IPC \u5305\u62ec Posix \u6d88\u606f\u961f\u5217\u3001Posix \u4fe1\u53f7\u706f \u548c Posix \u5171\u4eab\u5185\u5b58\u533a\u3002<\/p>\n\n\n\n<p>\uff081\uff09\u7531\u4e8e UNIX \u7248\u672c\u7684\u591a\u6837\u6027\uff0c\u7535\u5b50\u7535\u6c14\u5de5\u7a0b\u534f\u4f1a\uff08IEEE\uff09\u5f00\u53d1\u4e86\u4e00\u4e2a\u72ec\u7acb\u7684 UNIX \u6807\u51c6\uff0c\u8fd9\u4e2a\u65b0\u7684 ANSI UNIX 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class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>\u76ee\u7684<\/strong><\/p>\n\n\n\n<p>\uff081\uff09\u6570\u636e\u4f20\u8f93\uff1a\u4e00\u4e2a\u8fdb\u7a0b\u9700\u8981\u5c06\u5b83\u7684\u6570\u636e\u53d1\u9001\u7ed9\u53e6\u5916\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u53d1\u9001\u7684\u6570\u636e\u91cf\u57281B\u81f3\u51e0MB\u4e4b\u95f4\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u5171\u4eab\u6570\u636e\uff1a\u591a\u4e2a\u8fdb\u7a0b\u60f3\u8981\u64cd\u4f5c\u5171\u4eab\u6570\u636e\uff0c\u82e5\u4e00\u4e2a\u8fdb\u7a0b\u5bf9\u5171\u4eab\u6570\u636e\u8fdb\u884c\u4fee\u6539\uff0c\u522b\u7684\u8fdb\u7a0b\u4e5f\u80fd\u7acb\u5373\u770b\u5230\u3002<\/p>\n\n\n\n<p>\uff083\uff09\u901a\u77e5\u4e8b\u4ef6\uff1a\u4e00\u4e2a\u8fdb\u7a0b\u9700\u8981\u5411\u53e6\u4e00\u4e2a\u6216\u4e00\u7ec4\u8fdb\u7a0b\u53d1\u9001\u6d88\u606f\uff0c\u901a\u77e5\u5b83\uff08\u5b83\u4eec\uff09\u53d1\u751f\u4e86\u67d0\u79cd\u4e8b\u4ef6\uff08\u6bd4\u5982\u5b50\u8fdb\u7a0b\u7ec8\u6b62\u65f6\u4f1a\u53d1\u9001\u4fe1\u53f7\u901a\u77e5\u7236\u8fdb\u7a0b\uff09\u3002<\/p>\n\n\n\n<p>\uff084\uff09\u8d44\u6e90\u5171\u4eab\uff1a\u591a\u4e2a\u8fdb\u7a0b\u4e4b\u95f4\u5171\u4eab\u540c\u6837\u7684\u8d44\u6e90\u3002\u4e3a\u4e86\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u9700\u8981\u5185\u6838\u63d0\u4f9b\u9501\u548c\u540c\u6b65\u673a\u5236\u3002<\/p>\n\n\n\n<p>\uff085\uff09\u8fdb\u7a0b\u63a7\u5236\uff1a\u6709\u4e9b\u8fdb\u7a0b\u5e0c\u671b\u5b8c\u5168\u63a7\u5236\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u7684\u6267\u884c\uff08\u5982 Debug \u8fdb\u7a0b\uff09\uff0c\u6b64\u65f6\u8fdb\u7a0b\u63a7\u5236\u5e0c\u671b\u80fd\u591f\u62e6\u622a\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u7684\u6240\u6709\u4fe1\u606f\u548c\u5f02\u5e38\uff0c\u5e76\u80fd\u591f\u53ca\u65f6\u77e5\u9053\u5b83\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<p><strong>\u7b80\u4ecb<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u901a\u4fe1\u65b9\u5f0f<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>\u7ba1\u9053\uff08Pipe\uff09\u548c\u6709\u540d\u7ba1\u9053\uff08FiFO\uff09<\/td><td>\u7ba1\u9053\u53ef\u4ee5\u7528\u4e8e\u5177\u6709\u4eb2\u7f18\u5173\u7cfb\u8fdb\u7a0b\u95f4\u901a\u4fe1\uff0c\u6709\u540d\u7ba1\u9053\u514b\u670d\u4e86\u7ba1\u9053\u6ca1\u6709\u540d\u5b57\u7684\u9650\u5236\uff0c\u56e0\u6b64\uff0c\u5b83\u8fd8\u53ef\u4ee5\u7528\u4e8e\u65e0\u4eb2\u7f18\u5173\u7cfb\u8fdb\u7a0b\u95f4\u901a\u4fe1\u3002<\/td><\/tr><tr><td>\u4fe1\u53f7\uff08Signal\uff09<\/td><td>\u4fe1\u53f7\u662f\u6bd4\u8f83\u590d\u6742\u7684\u901a\u4fe1\u65b9\u5f0f\uff0c\u7528\u4e8e\u901a\u77e5\u63a5\u6536\u8fdb\u7a0b\u6709\u67d0\u79cd\u4e8b\u4ef6\u53d1\u751f\uff0c\u9664\u4e86\u7528\u4e8e\u8fdb\u7a0b\u95f4\u901a\u4fe1\u5916\uff0c\u8fdb\u7a0b\u8fd8\u53ef\u4ee5\u53d1\u9001\u4fe1\u53f7\u7ed9\u672c\u8eab\uff1bLinux \u9664\u4e86\u652f\u6301 UNIX \u65e9\u671f\u4fe1\u53f7\u8bed\u4e49\u51fd\u6570 signal \u5916\uff0c\u8fd8\u652f\u6301\u8bed\u4e49\u7b26\u5408 POSIX.1 \u6807\u51c6\u7684\u4fe1\u53f7\u51fd\u6570 sigaction \uff08\u5b9e\u9645\u4e0a\uff0c\u8be5\u51fd\u6570\u662f\u57fa\u4e8e BSD \u7684\uff0cBSD \u4e3a\u4e86\u5728\u5b9e\u73b0\u53ef\u9760\u4fe1\u53f7\u673a\u5236\u7684\u540c\u65f6\u53c8\u80fd\u591f\u7edf\u4e00\u5bf9\u5916\u63a5\u53e3\uff0c\u7528 sigaction \u51fd\u6570\u91cd\u65b0\u5b9e\u73b0\u4e86 signal \u51fd\u6570\uff09\u3002<br>\u4fe1\u53f7\u662f\u5728\u8f6f\u4ef6\u5c42\u6b21\u4e0a\u5bf9\u7ec8\u7aef\u673a\u5236\u7684\u4e00\u79cd\u6a21\u62df\u662f\u4e00\u79cd\u5f02\u6b65\u901a\u4fe1\u65b9\u5f0f\u3002<br>\u4fe1\u53f7\u53ef\u4ee5\u5728\u76f4\u63a5\u8fdb\u884c\u7528\u6237\u7a7a\u95f4\u8fdb\u7a0b\u548c\u5185\u6838\u8fdb\u7a0b\u4e4b\u95f4\u7684\u4ea4\u4e92\uff0c\u5185\u6838\u8fdb\u7a0b\u4e5f\u53ef\u4ee5\u5229\u7528\u5b83\u6765\u901a\u77e5\u7528\u6237\u7a7a\u95f4\u8fdb\u7a0b\u53d1\u751f\u4e86\u54ea\u4e9b\u7cfb\u7edf\u4e0a\u4e8b\u4ef6\uff0c\u5b83\u53ef\u4ee5\u5728\u4efb\u4f55\u65f6\u5019\u53d1\u7ed9\u67d0\u4e00\u8fdb\u7a0b\uff0c\u800c\u65e0\u9700\u77e5\u9053\u8be5\u8fdb\u7a0b\u7684\u72b6\u6001\u3002<br>\u5982\u679c\u8be5\u8fdb\u7a0b\u5f53\u524d\u5e76\u672a\u5904\u4e8e\u6267\u884c\u6001\uff0c\u5219\u8be5\u4fe1\u53f7\u5c31\u7531\u5185\u6838\u4fdd\u5b58\u8d77\u6765\uff0c\u76f4\u5230\u8be5\u8fdb\u7a0b\u6062\u590d\u6267\u884c\u518d\u4f20\u9012\u7ed9\u5b83\uff1b\u5982\u679c\u4e00\u4e2a\u4fe1\u53f7\u88ab\u8fdb\u7a0b\u8bbe\u7f6e\u4e3a\u963b\u585e\uff0c\u5219\u8be5\u4fe1\u53f7\u7684\u4f20\u9012\u88ab\u5ef6\u8fdf\uff0c\u76f4\u5230\u5176\u963b\u585e\u4e0d\u53d6\u6d88\u65f6\u624d\u4f20\u9012\u7ed9\u8fdb\u7a0b\u3002<\/td><\/tr><tr><td>\u6d88\u606f\u961f\u5217<\/td><td>\u6d88\u606f\u961f\u5217\u662f\u6d88\u606f\u7684\u94fe\u63a5\u8868\uff0c\u5305\u62ec POSIX \u6d88\u606f\u961f\u5217\u548c System V \u6d88\u606f\u961f\u5217\u3002\u6709\u8db3\u591f\u6743\u9650\u7684\u8fdb\u7a0b\u53ef\u4ee5\u5411\u961f\u5217\u4e2d\u6dfb\u52a0\u6d88\u606f\uff0c\u88ab\u8d4b\u4e88\u8bfb\u6743\u9650\u7684\u8fdb\u7a0b\u5219\u53ef\u4ee5\u8bfb\u8d70\u961f\u5217\u4e2d\u7684\u6d88\u606f\u3002\u6d88\u606f\u961f\u5217\u514b\u670d\u4e86\u4fe1\u53f7\u627f\u8f7d\u4fe1\u606f\u91cf\u5c11\u3001\u7ba1\u9053\u53ea\u80fd\u627f\u63a5\u65e0\u683c\u5f0f\u5b57\u8282\u6d41\uff0c\u4ee5\u53ca\u7f13\u51b2\u533a\u5927\u5c0f\u53d7\u9650\u7b49\u7f3a\u70b9\u3002<\/td><\/tr><tr><td>\u4fe1\u53f7\u91cf\uff08Semaphore\uff09\/\u4fe1\u53f7\u706f<\/td><td>\u4fe1\u53f7\u91cf\u4e3b\u8981\u88ab\u7528\u4f5c\u8fdb\u7a0b\u95f4\u6216\u540c\u4e00\u8fdb\u7a0b\u4e0d\u540c\u7ebf\u7a0b\u4e4b\u95f4\u7684\u540c\u6b65\u624b\u6bb5\u3002\u4fe1\u53f7\u91cf\u662f\u7528\u6765\u89e3\u51b3\u8fdb\u7a0b\u4e4b\u95f4\u540c\u6b65\u4e0e\u4e92\u65a5\u95ee\u9898\u7684\u4e00\u79cd\u8fdb\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\u673a\u5236\uff0c\u5305\u62ec\u4e00\u4e2a\u79f0\u4e3a\u4fe1\u53f7\u91cf\u7684\u53d8\u91cf\u548c\u5728\u8be5\u4fe1\u53f7\u91cf\u4e0b\u7b49\u5f85\u8d44\u6e90\u7684\u8fdb\u7a0b\u7b49\u5f85\u961f\u5217\uff0c\u4ee5\u53ca\u5bf9\u4fe1\u53f7\u91cf\u8fdb\u884c\u7684\u4e24\u4e2a\u539f\u5b50\u64cd\u4f5c\uff08PV \u64cd\u4f5c\uff09\u3002\u5176\u4e2d\u4fe1\u53f7\u91cf\u5bf9\u5e94\u4e8e\u67d0\u4e00\u79cd\u8d44\u6e90\uff0c\u53d6\u4e00\u4e2a\u975e\u8d1f\u7684\u6574\u578b\u503c\u3002\u4fe1\u53f7\u91cf\u7684\u503c\u662f\u6307\u5f53\u524d\u53ef\u7528\u7684\u8d44\u6e90\u6570\u91cf\uff0c\u82e5\u5b83\u7b49\u4e8e 0 \u5219\u610f\u5473\u7740\u76ee\u524d\u6ca1\u6709\u53ef\u7528\u7684\u8d44\u6e90\u3002<\/td><\/tr><tr><td>\u5171\u4eab\u5185\u5b58\uff08Shared Memory\uff09<\/td><td>\u5171\u4eab\u5185\u5b58\u53ef\u4ee5\u8bf4\u662f\u6700\u6709\u7528\u7684\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u65b9\u5f0f\uff0c\u4e5f\u662f\u6700\u5feb\u7684\u3002\u4e24\u4e2a\u4e0d\u540c\u8fdb\u7a0bA\u3001B\u5171\u4eab\u5185\u5b58\u7684\u610f\u601d\u662f\uff0c\u540c\u4e00\u5757\u7269\u7406\u5185\u5b58\u88ab\u6620\u5c04\u5230 A \u548c B \u5404\u81ea\u7684\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\u4e2d\u3002\u8fdb\u7a0b A \u53ef\u4ee5\u5373\u65f6\u770b\u5230\u8fdb\u7a0b B \u5bf9\u5171\u4eab\u5185\u5b58\u4e2d\u7684\u66f4\u65b0\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u7531\u4e8e\u591a\u4e2a\u5185\u5b58\u5171\u4eab\u4e00\u5757\u5185\u5b58\u533a\u57df\uff0c\u5fc5\u7136\u9700\u8981\u67d0\u79cd\u540c\u6b65\u673a\u5236\uff0c\u4e92\u65a5\u9501\u548c\u4fe1\u53f7\u91cf\u90fd\u53ef\u4ee5\u3002\u91c7\u7528\u5171\u4eab\u5185\u5b58\u901a\u4fe1\u7684\u4e00\u4e2a\u663e\u800c\u6613\u89c1\u7684\u597d\u5904\u662f\u6548\u7387\u9ad8\uff0c\u56e0\u4e3a\u8fdb\u7a0b\u53ef\u4ee5\u76f4\u63a5\u8bfb\u5199\u5185\u5b58\uff0c\u800c\u4e0d\u9700\u8981\u4efb\u4f55\u6570\u636e\u7684\u590d\u5236\u3002<\/td><\/tr><tr><td>\u5957\u63a5\u5b57\uff08Socket\uff09<\/td><td>\u5957\u63a5\u5b57\u662f\u66f4\u4e3a\u4e00\u822c\u7684\u8fdb\u7a0b\u95f4\u901a\u4fe1\u673a\u5236\uff0c\u53ef\u7528\u4e8e\u4e0d\u540c\u673a\u5668\u4e4b\u95f4\u7684\u8fdb\u7a0b\u901a\u4fe1\u3002\u8d77\u521d\u662f\u7531 UNIX \u7cfb\u7edf\u7684 BSD \u5206\u652f\u5f00\u53d1\u51fa\u6765\u7684\uff0c\u4f46\u73b0\u5728\u4e00\u822c\u53ef\u4ee5\u79fb\u690d\u5230\u5176\u5b83\u7c7b UNIX \u7cfb\u7edf\u4e0a\uff0cLinux \u548c System V \u7684\u53d8\u79cd\u90fd\u652f\u6301\u5957\u63a5\u5b57\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"has-text-align-center wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AE%A1%E9%81%93%E9%80%9A%E4%BF%A1\"><\/span>\u7ba1\u9053\u901a\u4fe1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-text-align-center\">\u8bfb\u5199\u65e0\u540d\u7ba1\u9053<\/p>\n\n\n\n<p>\u7ba1\u9053\u7684\u4e24\u7aef\u4e00\u4e2a\u7528\u4e00\u4e2a\u5927\u5c0f\u4e3a 2 \u7684 int \u6570\u7ec4\u6765\u63cf\u8ff0\uff0c\u4e0b\u68070\u30011\u5206\u522b\u5bf9\u5e94\u8bfb\u3001\u5199\u3002<\/p>\n\n\n\n<p>\u4ece\u7ba1\u9053\u4e2d\u8bfb\u53d6\u6570\u636e\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>\uff081\uff09\u5982\u679c\u7ba1\u9053\u7684\u5199\u7aef\u4e0d\u5b58\u5728\uff0c\u5219\u8ba4\u4e3a\u5df2\u7ecf\u8bfb\u5230\u4e86\u6570\u636e\u7684\u672b\u5c3e\uff0cread \u8bfb\u6570\u636e\u8fd4\u56de\u503c\u4e3a 0\uff1b<\/p>\n\n\n\n<p>\uff082\uff09\u82e5\u7ba1\u9053\u7684\u5199\u7aef\u5b58\u5728\uff0c\u5982\u679c\u8bf7\u6c42\u7684\u5b57\u8282\u6570\u5927\u4e8e PIPE_BUF\uff0c\u5219\u8fd4\u56de\u7ba1\u9053\u4e2d\u73b0\u6709\u7684\u6570\u636e\u5b57\u8282\u6570\uff1b\u5982\u679c\u8bf7\u6c42\u7684\u5b57\u8282\u6570\u4e0d\u5927\u4e8e PIPE_BUF\uff0c\u5219\u8fd4\u56de\u7ba1\u9053\u4e2d\u73b0\u6709\u7684\u6570\u636e\u5b57\u8282\u6570\uff08\u6b64\u65f6\uff0c\u7ba1\u9053\u4e2d\u6570\u636e\u91cf\u5c0f\u4e8e\u8bf7\u6c42\u7684\u6570\u636e\u91cf\uff09\uff0c\u6216\u8005\u8fd4\u56de\u8bf7\u6c42\u7684\u5b57\u8282\u6570\uff08\u6b64\u65f6\uff0c\u7ba1\u9053\u4e2d\u6570\u636e\u91cf\u4e0d\u5c0f\u4e8e\u8bf7\u6c42\u7684\u6570\u636e\u91cf\uff09\u3002<br>PIPE_BUF \u5728 include\/linux\/limits.h \u4e2d\u5b9a\u4e49\uff0c\u4e0d\u540c\u7684\u5185\u6838\u7248\u672c\u53ef\u80fd\u6709\u6240\u4e0d\u540c\uff0c\u53ef\u4ee5\u4f7f\u7528\u547d\u4ee4 <span style=\"color:#1e00a3\" class=\"has-inline-color\">ulimit -a<\/span> \u67e5\u8be2\uff0c\u5176\u4e2d <span style=\"color:#1e00a3\" class=\"has-inline-color\">pipe size<\/span>\uff0c\u6211\u8fd9\u91cc\u5c31\u662f 512B x 8 = 4KB<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"458\" height=\"330\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-11-231348.png\" alt=\"\" class=\"wp-image-825 lazyload\" data-srcset=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-11-231348.png 458w, https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-11-231348-300x216.png 300w\" data-sizes=\"(max-width: 458px) 100vw, 458px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 458px; --smush-placeholder-aspect-ratio: 458\/330;\" \/><\/figure>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/**\n * @author IYATT-yx\n * @date 2021-5-12\n * @brief \u7ba1\u9053\u793a\u4f8b1 - \u7ba1\u9053\u8bfb\u89c4\u5219\u9a8c\u8bc1 - \u5728\u7ba1\u9053\u5199\u7aef\u88ab\u5173\u95ed\u540e\uff0c\u5199\u5165\u7684\u6570\u636e\u5c06\u4e00\u76f4\u5b58\u5728\uff0c\u76f4\u5230\u88ab\u8bfb\u51fa\u4e3a\u6b62\u3002\n *\/\n#include &lt;stdio.h>\n#include &lt;unistd.h>\n#include &lt;sys\/types.h>\n\nint main(void)\n{\n    \/\/ pipe file descriptor\n    int pfd[2];\n\n    \/\/ \u521b\u5efa\u7ba1\u9053\n    if (pipe(pfd) &lt; 0)\n    {\n        perror(\"pipe error\");\n        return 0;\n    }\n\n    \/\/ \u521b\u5efa\u8fdb\u7a0b\n    pid_t pid = fork();\n\n    \/\/ \u7236\u8fdb\u7a0b\n    \/\/ \u8bfb\n    if (pid > 0)\n    {\n        \/\/ \u5173\u95ed\u5199\u7aef\n        close(pfd[1]);\n\n        \/\/ \u4f11\u7720\n        sleep(3);\n\n        \/\/ \u4ece\u7ba1\u9053\u8bfb\u6570\u636e\n        char rbuf[10];\n        if (read(pfd[0], rbuf, sizeof(rbuf)) > 0)\n        {\n            printf(\"\u7236\u8fdb\u7a0b\u6536\u5230\u5b50\u8fdb\u7a0b\u7684\u4fe1\u606f\uff1a %s\\n\", rbuf);\n        }\n        else\n        {\n            perror(\"\u7236\u8fdb\u7a0b\u8bfb\u53d6\u7ba1\u9053\u5931\u8d25\");\n            close(pfd[0]);\n            return 0;\n        }\n\n        close(pfd[0]);\n    }\n    \/\/ \u5b50\u8fdb\u7a0b\n    \/\/ \u5199\n    else if (pid == 0)\n    {\n        \/\/ \u5173\u95ed\u8bfb\u7aef\n        close(pfd[0]);\n\n        \/\/ \u5411\u7ba1\u9053\u5199\u6570\u636e\n        char wbuf[] = \"IYATT-yx\";\n        if (write(pfd[1], wbuf, sizeof(wbuf)) > 0)\n        {\n            printf(\"\u5b50\u8fdb\u7a0b\u5411\u7ba1\u9053\u5199\u5165\u6570\u636e\\n\");\n        }\n        else\n        {\n            perror(\"\u5b50\u8fdb\u7a0b write error\");\n            close(pfd[1]);\n            return 0;\n        }\n\n        close(pfd[1]);\n\n        printf(\"\u5b50\u8fdb\u7a0b\u5173\u95ed\u7ba1\u9053\u5199\u7aef\\n\");\n\n        sleep(5);\n        \n    }\n    else\n    {\n        perror(\"fork error\");\n        return 0;\n    }\n}<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"506\" height=\"102\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-12-012007.png\" alt=\"\" class=\"wp-image-827 lazyload\" data-srcset=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-12-012007.png 506w, https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-12-012007-300x60.png 300w\" data-sizes=\"(max-width: 506px) 100vw, 506px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 506px; --smush-placeholder-aspect-ratio: 506\/102;\" \/><\/figure>\n\n\n\n<p>\u5199\u7aef\u5bf9\u8bfb\u7aef\u5b58\u5728\u4f9d\u8d56\u6027\u3002\u5728\u5411\u7ba1\u9053\u4e2d\u5199\u5165\u6570\u636e\u65f6\uff0c\u5fc5\u987b\u786e\u4fdd\u5b58\u5728\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u6709\u8bfb\u7aef\uff0c\u5426\u5219\u53ef\u80fd\u4f1a\u51fa\u73b0 Broken pipe \u7684\u9519\u8bef\uff08\u7ba1\u9053\u7834\u88c2\uff0c\u8fdb\u7a0b\u6536\u5230 SIGPIPE \u4fe1\u53f7\uff0c\u9ed8\u8ba4\u52a8\u4f5c\u662f\u7ec8\u6b62\u8fdb\u7a0b\uff09\u3002<\/p>\n\n\n\n<p>\u7ba1\u9053\u7684\u539f\u5b50\u6027\u3002\u4e00\u4e2a\u7ba1\u9053\u7684\u5bb9\u91cf\u662f\u6709\u9650\u7684\u3002POSIX\u89c4\u5b9a\uff0c\u5c11\u4e8e PIPE_BUF \u7684\u5199\u64cd\u4f5c\u5fc5\u987b\u539f\u5b50\u5b8c\u6210\uff1a\u8981\u5199\u7684\u6570\u636e\u5e94\u88ab\u8fde\u7eed\u7684\u5199\u5230\u7ba1\u9053\uff1b\u5927\u4e8e PIPE_BUF \u7684\u5199\u64cd\u4f5c\u53ef\u80fd\u662f\u975e\u539f\u5b50\u7684: \u5185\u6838\u53ef\u80fd\u4f1a\u628a\u6b64\u6570\u636e\u4e0e\u5176\u5b83\u8fdb\u7a0b\u7684\u5bf9\u6b64\u7ba1\u9053\u7684\u5199\u64cd\u4f5c\u4ea4\u66ff\u8d77\u6765\u3002POSIX\u89c4\u5b9aPIPE_BUF\u81f3\u5c11\u4e3a512B(linux\u4e2d\u4e3a4KB)\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5f53\u8981\u5199\u5165\u7684\u6570\u636e\u91cf\u4e0d\u5927\u4e8ePIPE_BUF\u65f6\uff0clinux\u5c06\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002<br><\/li><li>\u5f53\u8981\u5199\u5165\u7684\u6570\u636e\u91cf\u5927\u4e8ePIPE_BUF\u65f6\uff0clinux\u5c06\u4e0d\u518d\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-center\">\u65e0\u540d\u7ba1\u9053\u7684\u5e94\u7528<\/p>\n\n\n\n<p>\u7528\u4e8e shell\uff0c\u7ba1\u9053\u53ef\u7528\u4e8e\u8f93\u5165\u8f93\u51fa\u7684\u91cd\u5b9a\u5411\uff0c\u5b83\u5c06\u4e00\u4e2a\u547d\u4ee4\u7684\u8f93\u51fa\u76f4\u63a5\u91cd\u5b9a\u5411\u5230\u53e6\u4e00\u4e2a\u547d\u4ee4\u7684\u8f93\u5165\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\uff1a ls \/ | grep &#8220;b&#8221;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"500\" height=\"297\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-12-171146.png\" alt=\"\" class=\"wp-image-832 lazyload\" data-srcset=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-12-171146.png 500w, https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-12-171146-300x178.png 300w\" data-sizes=\"(max-width: 500px) 100vw, 500px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 500px; --smush-placeholder-aspect-ratio: 500\/297;\" \/><\/figure>\n\n\n\n<p>\u4ee5\u53ca\u201c\u6709\u4eb2\u7f18\u201d\u7684\u8fdb\u7a0b\u4e4b\u95f4\u901a\u4fe1<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/**\n * @author IYATT-yx\n * @date 2021-5-12\n * @brief \u7ba1\u9053\u91cd\u5b9a\u5411\u793a\u4f8b - \u7236\u5b50\u8fdb\u7a0b\u901a\u4fe1\n *\/\n#include &lt;stdio.h>\n#include &lt;sys\/types.h>\n#include &lt;unistd.h>\n#include &lt;string.h>\n\nint main(int argc, char **argv)\n{\n    if (argc != 4)\n    {\n        printf(\"\u53c2\u6570\u9519\u8bef\\n\");\n        return 0;\n    }\n\n    if (strcmp(argv[1], \"-\"))\n    {\n        printf(\"\u8bf7\u7528 - \u4f5c\u4e3a\u7ba1\u9053\u8fde\u63a5\u7b26\u53f7\\n\");\n        return 0;\n    }\n\n    \/\/ \u7ba1\u9053\n    int pfd[2];\n\n    \/\/ \u521b\u5efa\u7ba1\u9053\n    if (pipe(pfd) == -1)\n    {\n        perror(\"pipe error\");\n        return 0;\n    }\n\n    \/\/ \u521b\u5efa\u5b50\u8fdb\u7a0b\n    pid_t pid = fork();\n\n    \/\/ \u7236\u8fdb\u7a0b - \u8bfb\u7ba1\u9053\n    if (pid > 0)\n    {\n        \/\/ \u5173\u95ed\u5199\u7aef\n        close(pfd[1]);\n\n        \/\/ \u7528\u4e8e\u8bfb\u7ba1\u9053\u7684\u7f13\u51b2\n        char buf[12];\n\n        \/\/ \u6301\u7eed\u4ece\u7ba1\u9053\u4e2d\u8bfb\u53d6\u6570\u636e\u5e76\u663e\u793a\u5230\u7ec8\u7aef\n        while ((read(pfd[0], buf, sizeof(buf))))\n        {\n            printf(\"%s\", buf);\n            \/\/ \u6e05\u7a7a\n            memset(buf, 0, sizeof(buf));\n        }\n\n        close(pfd[0]);\n        return 0;\n    }\n    \/\/ \u5b50\u8fdb\u7a0b - \u5199\u7ba1\u9053\n    else if (pid == 0)\n    {\n        \/\/ \u5173\u95ed\u8bfb\u7aef\n        close(pfd[0]);\n\n        \/\/ \u91cd\u5b9a\u5411\u8f93\u51fa\u5230\u7ba1\u9053\u5199\u7aef\n        dup2(pfd[1], STDOUT_FILENO);\n\n        \/\/ \u53c2\u6570\u901a\u8fc7\u547d\u4ee4\u884c\u53c2\u6570\u4f20\u5165\u7ed9 ls\n        execlp(argv[2], \"\", argv[3], NULL);\n\n        perror(\"execlp error\");\n    }\n    else\n    {\n        perror(\"fork error\");\n        return 0;\n    }\n}<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"581\" height=\"328\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-13-204956.png\" alt=\"\" class=\"wp-image-834 lazyload\" data-srcset=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-13-204956.png 581w, https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-13-204956-300x169.png 300w\" data-sizes=\"(max-width: 581px) 100vw, 581px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 581px; --smush-placeholder-aspect-ratio: 581\/328;\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">\u6709\u540d\u7ba1\u9053<\/p>\n\n\n\n<p>\u7ba1\u9053\u6700\u5927\u7684\u9650\u5236\u5c31\u662f\u5b83\u6ca1\u6709\u540d\u5b57\uff0c\u56e0\u6b64\uff0c\u53ea\u80fd\u7528\u4e8e\u201c\u6709\u4eb2\u7f18\u201d\u7684\u8fdb\u7a0b\u4e4b\u95f4\u901a\u4fe1\uff0c\u5728\u6709\u540d\u7ba1\u9053\uff08FIFO\uff09\u63d0\u51fa\u540e\uff0c\u89e3\u51b3\u4e86\u8fd9\u4e2a\u4e0d\u8db3\u3002FIFO \u4e0d\u540c\u4e8e\u7ba1\u9053\u4e4b\u5904\u5728\u4e8e\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u8def\u5f84\u540d\u4e0e\u4e4b\u5173\u8054\uff0c\u4ee5 FIFO \u7684\u6587\u4ef6\u5f62\u5f0f\u5b58\u5728\u4e8e\u6587\u4ef6\u7cfb\u7edf\u4e2d\u3002\u8fd9\u6837\uff0c\u5373\u4f7f\u4e0e FIFO \u7684\u521b\u5efa\u8fdb\u7a0b\u4e0d\u5b58\u5728\u4eb2\u7f18\u5173\u7cfb\u7684\u8fdb\u7a0b\uff0c\u53ea\u8981\u53ef\u4ee5\u8bbf\u95ee\u8be5\u8def\u5f84\uff0c\u5c31\u80fd\u901a\u8fc7 FIFO \u76f8\u4e92\u901a\u4fe1\uff0c\u56e0\u6b64\u4e0d\u76f8\u5173\u7684\u8fdb\u7a0b\u4e5f\u80fd\u901a\u8fc7 FIFO \u4ea4\u6362\u6570\u636e\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cFIFO \u4e25\u683c\u9075\u5faa\u5148\u8fdb\u5148\u51fa\uff08First In First Out\uff09\uff0c\u5bf9\u7ba1\u9053\u548c FIFO \u7684\u8bfb\u53d6\u603b\u662f\u4ece\u5f00\u59cb\u5904\u8fd4\u56de\u6570\u636e\u7684\uff0c\u5bf9\u7ba1\u9053\u548c FiFO \u7684\u5199\u5165\u5219\u628a\u6570\u636e\u6dfb\u52a0\u5230\u672b\u5c3e\uff0c\u4e0d\u652f\u6301 lseek \u7b49\u8bfb\u5199\u4f4d\u7f6e\u504f\u79fb\u64cd\u4f5c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">       <strong>int<\/strong> <strong>mkfifo(const<\/strong> <strong>char<\/strong> <strong>*<\/strong>pathname<strong>,<\/strong> <strong>mode_t<\/strong> mode<strong>);<\/strong>\n---- \u521b\u5efa\u6709\u540d\u7ba1\u9053<\/pre>\n\n\n\n<p class=\"has-text-align-center\">\u4ece FIFO \u4e2d\u8bfb\u53d6<\/p>\n\n\n\n<p>\u5982\u679c\u4e00\u4e2a\u8fdb\u7a0b\u4e3a\u4e86\u4ece FIFO \u4e2d\u8bfb\u53d6\u6570\u636e\u800c\u963b\u585e\u6253\u5f00\u4e86 FIFO\uff0c\u90a3\u4e48\u79f0\u8be5\u8fdb\u7a0b\u5185\u7684\u8bfb\u64cd\u4f5c\u4e3a\u8bbe\u7f6e\u4e86\u963b\u585e\u6807\u5fd7\u7684\u8bfb\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\uff081) \u5982\u679c\u6709\u8fdb\u7a0b\u5199\u5165\u6253\u5f00 FIFO\uff0c\u4e14\u5f53\u524d FIFO \u5185\u6ca1\u6709\u6570\u636e\uff0c\u5219\u5bf9\u4e8e\u8bbe\u7f6e\u4e86\u963b\u585e\u6807\u5fd7\u7684\u8bfb\u64cd\u4f5c\u6765\u8bf4\uff0c\u5c06\u4e00\u76f4\u963b\u585e\u3002\u5bf9\u4e8e\u6ca1\u6709\u8bbe\u7f6e\u963b\u585e\u6807\u5fd7\u7684\u8bfb\u64cd\u4f5c\u6765\u8bf4\u5219\u8fd4\u56de -1 \uff0cerrno \u8bbe\u4e3a EAGAIN\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u5bf9\u4e8e\u8bbe\u7f6e\u4e86\u963b\u585e\u6807\u5fd7\u7684\u8bfb\u64cd\u4f5c\u6765\u8bf4\uff0c\u9020\u6210\u963b\u585e\u7684\u539f\u56e0\u6709\u4e24\u79cd\uff1a\u2460 \u5f53\u524d FIFO \u5185\u6709\u6570\u636e\uff0c\u4f46\u6709\u5176\u5b83\u8fdb\u7a0b\u5728\u8bfb\u8fd9\u4e9b\u6570\u636e\uff1b\u2461 FIFO \u5185\u6ca1\u6709\u6570\u636e\u3002\u4e0d\u963b\u585e\u7684\u539f\u56e0\u662f FIFO \u4e2d\u6709\u65b0\u7684\u6570\u636e\u5199\u5165\uff0c\u4e0d\u8bba\u5199\u5165\u6570\u636e\u7684\u5927\u5c0f\uff0c\u4e5f\u4e0d\u8bba\u8bfb\u64cd\u4f5c\u8bf7\u6c42\u591a\u5c11\u6570\u636e\u91cf\u3002<\/p>\n\n\n\n<p>\uff083\uff09 \u8bfb\u64cd\u4f5c\u6253\u5f00\u7684\u963b\u585e\u6807\u5fd7\u53ea\u5bf9\u672c\u8fdb\u7a0b\u7b2c\u4e00\u4e2a\u8bfb\u64cd\u4f5c\u65bd\u52a0\u4f5c\u7528\uff0c\u5982\u679c\u672c\u8fdb\u7a0b\u5185\u6709\u591a\u4e2a\u8bfb\u64cd\u4f5c\u5e8f\u5217\uff0c\u5219\u5728\u7b2c\u4e00\u4e2a\u8bfb\u64cd\u4f5c\u88ab\u5524\u9192\u5e76\u5b8c\u6210\u540e\uff0c\u5176\u5b83\u5c06\u8981\u6267\u884c\u7684\u8bfb\u64cd\u4f5c\u5c06\u4e0d\u518d\u963b\u585e\u3002<\/p>\n\n\n\n<p>\uff084\uff09\u5982\u679c\u6ca1\u6709\u8fdb\u7a0b\u5199\u5165\u6253\u5f00 FIFO\uff0c\u5219\u8bbe\u7f6e\u4e86\u963b\u585e\u6807\u5fd7\u7684\u8bfb\u64cd\u4f5c\u4f1a\u963b\u585e\u3002<\/p>\n\n\n\n<p class=\"has-text-align-center\">\u5411 FIFO \u4e2d\u5199\u5165\u6570\u636e<\/p>\n\n\n\n<p>\u5982\u679c\u4e00\u4e2a\u8fdb\u7a0b\u4e3a\u4e86\u5411 FIFO \u4e2d\u5199\u5165\u6570\u636e\u800c\u963b\u585e\u6253\u5f00\u4e86 FIFO\uff0c\u90a3\u4e48\u79f0\u8be5\u8fdb\u7a0b\u5185\u7684\u5199\u64cd\u4f5c\u4e3a\u8bbe\u7f6e\u4e86\u963b\u585e\u6807\u5fd7\u7684\u5199\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\uff081\uff09\u5bf9\u4e8e\u8bbe\u7f6e\u4e86\u963b\u585e\u6807\u5fd7\u7684\u5199\u64cd\u4f5c\uff1a\u2460 \u5f53\u8981\u5199\u5165\u7684\u6570\u636e\u91cf\u4e0d\u5927\u4e8e PIPE_BUF \u65f6\uff0cLinux \u5c06\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002\u5982\u679c\u6b64\u65f6\u7ba1\u9053\u7a7a\u95f2\u7f13\u51b2\u533a\u4e0d\u8db3\u4ee5\u5bb9\u7eb3\u8981\u5199\u5165\u7684\u5b57\u8282\u6570\uff0c\u5219\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u76f4\u5230\u7f13\u51b2\u533a\u4e2d\u80fd\u591f\u5bb9\u7eb3\u8981\u5199\u5165\u7684\u5b57\u8282\u6570\u65f6\uff0c\u624d\u5f00\u59cb\u8fdb\u884c\u4e00\u6b21\u5199\u64cd\u4f5c\u3002\u2461 \u5f53\u8981\u5199\u5165\u7684\u6570\u636e\u91cf\u5927\u4e8e PIPE_BUF \u65f6\uff0cLinux \u5c06\u4e0d\u518d\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002FIFO \u7f13\u51b2\u533a\u4e00\u6709\u7a7a\u95f2\u533a\u57df\uff0c\u5c31\u4f1a\u8bd5\u56fe\u5411\u7ba1\u9053\u4e2d\u5199\u5165\u6570\u636e\uff0c\u5199\u5b8c\u540e\u8fd4\u56de\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u5bf9\u4e8e\u6ca1\u6709\u8bbe\u7f6e\u963b\u585e\u6807\u5fd7\u7684\u5199\u64cd\u4f5c\uff1a\u2460 \u5f53\u8981\u5199\u5165\u7684\u6570\u636e\u91cf\u5927\u4e8e PIPE_BUF \u65f6\uff0cLinux \u5c06\u4e0d\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002\u5728\u5199\u6ee1\u6240\u6709 FIFO \u7a7a\u95f2\u7f13\u51b2\u533a\u540e\uff0c\u5199\u64cd\u4f5c\u8fd4\u56de\u3002\u2461 \u5f53\u8981\u5199\u5165\u7684\u6570\u636e\u91cf\u4e0d\u5927\u4e8e PIPE_BUF \u65f6\uff0cLinux \u5c06\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002\u5982\u679c\u5f53\u524d FIFO \u7a7a\u95f2\u7f13\u51b2\u533a\u80fd\u591f\u5bb9\u7eb3\u5199\u5165\u7684\u5b57\u8282\u6570\uff0c\u5219\u5199\u5b8c\u540e\u8fd4\u56de\u6210\u529f\uff1b\u5982\u679c\u5f53\u524d FIFO \u7a7a\u7f13\u51b2\u533a\u4e0d\u80fd\u5bb9\u7eb3\u8bf7\u6c42\u5199\u5165\u7684\u6570\u636e\u5927\u5c0f\uff0c\u5219\u8fd4\u56de EAGAIN\u3002<\/p>\n\n\n\n<h2 class=\"has-text-align-center wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BF%A1%E5%8F%B7\"><\/span>\u4fe1\u53f7<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-text-align-center\">\u4fe1\u53f7\u53ca\u4fe1\u53f7\u6765\u6e90<\/p>\n\n\n\n<p>\u4fe1\u53f7\u7684\u672c\u8d28\uff1a<\/p>\n\n\n\n<p>\u4fe1\u53f7\u662f\u5728\u8f6f\u4ef6\u5c42\u6b21\u4e0a\u5bf9\u7ec8\u7aef\u673a\u5236\u7684\u4e00\u79cd\u6a21\u62df\uff0c\u5728\u539f\u7406\u4e0a\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u6536\u5230\u4e00\u4e2a\u4fe1\u53f7\u4e0e\u5904\u7406\u5668\u6536\u5230\u4e00\u4e2a\u7ec8\u7aef\u8bf7\u6c42\u53ef\u4ee5\u8bf4\u662f\u4e00\u6837\u7684\u3002\u4fe1\u53f7\u662f\u5f02\u6b65\u7684\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e0d\u5fc5\u901a\u8fc7\u4efb\u4f55\u64cd\u4f5c\u6765\u7b49\u5f85\u4fe1\u53f7\u7684\u5230\u8fbe\uff0c\u4e8b\u5b9e\u4e0a\uff0c\u8fdb\u7a0b\u4e5f\u4e0d\u77e5\u9053\u4fe1\u53f7\u5230\u5e95\u4ec0\u4e48\u65f6\u5019\u5230\u8fbe\u3002<\/p>\n\n\n\n<p>\u4fe1\u53f7\u662f\u8fdb\u7a0b\u95f4\u901a\u4fe1\u673a\u5236\u4e2d\u552f\u4e00\u7684\u5f02\u6b65\u901a\u4fe1\u673a\u5236\uff0c\u53ef\u4ee5\u770b\u4f5c\u5f02\u6b65\u901a\u77e5\uff0c\u901a\u77e5\u63a5\u6536\u4fe1\u53f7\u7684\u8fdb\u7a0b\u6709\u54ea\u4e9b\u4e8b\u4ef6\u53d1\u751f\u4e86\u3002\u4fe1\u53f7\u673a\u5236\u901a\u8fc7 POSIX \u5b9e\u65f6\u6269\u5c55\u540e\uff0c\u529f\u80fd\u66f4\u52a0\u5f3a\u5927\uff0c\u9664\u4e86\u57fa\u672c\u901a\u77e5\u529f\u80fd\uff0c\u8fd8\u53ef\u4ee5\u4f20\u9012\u9644\u52a0\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u4fe1\u53f7\u7684\u6765\u6e90\uff1a<\/p>\n\n\n\n<p>\u4fe1\u53f7\u4e8b\u4ef6\u7684\u53d1\u751f\u6709\u4e24\u4e2a\u6765\u6e90\uff1a\u2460 \u786c\u4ef6\uff08\u6bd4\u5982\u6309\u4e0b\u4e86\u952e\u76d8\u6216\u8005\u786c\u4ef6\u6545\u969c\uff09\uff1b\u2461 \u8f6f\u4ef6\uff0c\u6700\u5e38\u7528\u7684\u53d1\u9001\u4fe1\u53f7\u7684\u7cfb\u7edf\u51fd\u6570\u662f kill\u3001raise\u3001alarm\u3001setitimer \u548c sigqueue\uff0c\u8fd8\u5305\u62ec\u4e00\u4e9b\u975e\u6cd5\u8fd0\u7b97\u64cd\u4f5c\u7b49\u3002<\/p>\n\n\n\n<p class=\"has-text-align-center\">\u4fe1\u53f7\u79cd\u7c7b<\/p>\n\n\n\n<p>\u67e5\u770b\u4fe1\u53f7\uff1a\u524d\u5f80 <a target=\"_blank\" href=\"https:\/\/blog.iyatt.com\/linux%e5%bc%80%e5%8f%91\/2021\/04\/25\/shell-%e7%bc%96%e7%a8%8b\/\" rel=\"noopener\">shell \u7f16\u7a0b<\/a> \u7684 \u7528 \u201ctrap \u547d\u4ee4\u6355\u6349\u4fe1\u53f7\u201d \u90e8\u5206.<\/p>\n\n\n\n<p>\u4e0d\u53ef\u9760\u4fe1\u53f7\uff1a<\/p>\n\n\n\n<p>Linux \u4fe1\u53f7\u673a\u5236\u57fa\u672c\u4e0a\u662f\u4ece UNIX \u4e2d\u7ee7\u627f\u8fc7\u6765\u7684\uff0c\u5728\u65e9\u671f\u7684 UNIX \u4e2d\u4fe1\u53f7\u673a\u5236\u6bd4\u8f83\u7b80\u5355\u548c\u539f\u59cb\uff0c\u540e\u6765\u5728\u5b9e\u8df5\u4e2d\u66b4\u9732\u51fa\u4e00\u4e9b\u95ee\u9898\uff0c\u56e0\u6b64\u628a\u90a3\u4e9b\u5efa\u7acb\u5728\u65e9\u671f\u673a\u5236\u4e0a\u7684\u4fe1\u53f7\u53eb\u505a\u4e0d\u53ef\u9760\u4fe1\u53f7\uff08\u4e00\u822c 1~31 \u4e3a\u4e0d\u53ef\u9760\u4fe1\u53f7\uff0c31 ~ 64 \u4e3a\u4e0d\u53ef\u9760\u4fe1\u53f7\uff0c\u524d\u9762 \u201cshell \u7f16\u7a0b\u201d \u6709\u4e0d\u53ef\u9760\u4fe1\u53f7\u7684\u8be6\u60c5\u56fe\uff09\u3002\u5bf9\u4e8e\u8fd9\u4e9b\u4e0d\u53ef\u9760\u4fe1\u53f7\uff0c\u8fdb\u7a0b\u6bcf\u6b21\u5904\u7406\u4fe1\u53f7\u540e\uff0c\u5c31\u5c06\u5bf9\u4fe1\u53f7\u7684\u54cd\u5e94\u8bbe\u7f6e\u4e3a\u9ed8\u8ba4\u52a8\u4f5c\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8fd9\u5c06\u5bfc\u81f4\u5bf9\u4fe1\u53f7\u7684\u9519\u8bef\u5904\u7406\uff0c\u56e0\u6b64\uff0c\u5982\u679c\u7528\u6237\u4e0d\u5e0c\u671b\u8fd9\u6837\u64cd\u4f5c\uff0c\u5c31\u8981\u5728\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u7684\u7ed3\u5c3e\u518d\u6b21\u8c03\u7528 signal()\uff0c\u91cd\u65b0\u5b89\u88c5\u8be5\u4fe1\u53f7\u3002<\/p>\n\n\n\n<p>Linux \u652f\u6301\u4e0d\u53ef\u9760\u4fe1\u53f7\uff0c\u4f46\u662f\u5bf9\u4e0d\u53ef\u9760\u4fe1\u53f7\u673a\u5236\u505a\u4e86\u6539\u8fdb\uff1a\u5728\u8c03\u7528\u5b8c\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u540e\uff0c\u4e0d\u5fc5\u91cd\u65b0\u8c03\u7528\u8be5\u4fe1\u53f7\u7684\u5b89\u88c5\u51fd\u6570\uff08\u4fe1\u53f7\u5b89\u88c5\u51fd\u6570\u662f\u5728\u53ef\u9760\u673a\u5236\u4e0a\u5b9e\u73b0\u7684\uff09\uff0c\u56e0\u6b64\uff0cLinux \u4e0b\u7684\u4e0d\u53ef\u9760\u4fe1\u53f7\u4e3b\u8981\u662f\u6307\u4fe1\u53f7\u53ef\u80fd\u4e22\u5931\u3002<\/p>\n\n\n\n<p>\u53ef\u9760\u4fe1\u53f7\uff1a<\/p>\n\n\n\n<p>\u968f\u7740\u65f6\u95f4\u7684\u53d1\u5c55\uff0c\u5b9e\u8df5\u8bc1\u660e\u4e86\u6709\u5fc5\u8981\u5bf9\u4fe1\u53f7\u7684\u539f\u59cb\u673a\u5236\u52a0\u4ee5\u6539\u8fdb\u548c\u6269\u5145\uff0c\u6240\u4ee5\uff0c\u540e\u6765\u5404\u79cd UNIX \u7248\u672c\u5206\u522b\u5728\u8fd9\u65b9\u9762\u8fdb\u884c\u4e86\u7814\u7a76\uff0c\u529b\u56fe\u5b9e\u73b0\u53ef\u9760\u4fe1\u53f7\u3002\u7531\u4e8e\u539f\u6765\u5b9a\u4e49\u7684\u4fe1\u53f7\u5df2\u6709\u8bb8\u591a\u5e94\u7528\uff0c\u4e0d\u597d\u518d\u505a\u6539\u52a8\uff0c\u6700\u7ec8\u53ea\u597d\u53c8\u589e\u52a0\u4e86\u4e00\u4e9b\u4fe1\u53f7\uff0c\u5e76\u5728\u4e00\u5f00\u59cb\u5c31\u628a\u5b83\u4eec\u5b9a\u4e49\u4e3a\u53ef\u9760\u4fe1\u53f7\uff0c\u8fd9\u4e9b\u4fe1\u53f7\u652f\u6301\u6392\u961f\uff0c\u4e0d\u4f1a\u4e22\u5931\u3002\u540c\u65f6\uff0c\u4fe1\u53f7\u7684\u53d1\u9001\u548c\u5b89\u88c5\u4e5f\u51fa\u73b0\u4e86\u65b0\u7248\u672c\uff1asigqueue() \u548c\u4fe1\u53f7\u5b89\u88c5\u51fd\u6570 sigaction \u3002POSIX.4 \u5bf9\u53ef\u9760\u4fe1\u53f7\u673a\u5236\u505a\u4e86\u6807\u51c6\u5316\uff0c\u4f46\u662f\u53ea\u5bf9\u53ef\u9760\u4fe1\u53f7\u673a\u5236\u5e94\u5177\u6709\u7684\u529f\u80fd\u548c\u4fe1\u53f7\u673a\u5236\u7684\u5bf9\u5916\u63a5\u53e3\u505a\u4e86\u6807\u51c6\u5316\uff0c\u5bf9\u4fe1\u53f7\u673a\u5236\u7684\u5b9e\u73b0\u6ca1\u6709\u505a\u5177\u4f53\u7684\u89c4\u5b9a\u3002<\/p>\n\n\n\n<p>Linux \u5728\u652f\u6301\u65b0\u7248\u672c\u7684\u4fe1\u53f7\u5b89\u88c5\u51fd\u6570 sigaction \u548c\u4fe1\u53f7\u53d1\u9001\u51fd\u6570 sigqueue \u7684\u540c\u65f6\uff0c\u4ecd\u7136\u652f\u6301\u65e9\u671f\u7684\u4fe1\u53f7\u5b89\u88c5\u51fd\u6570 signal \u548c\u4fe1\u53f7\u53d1\u9001\u51fd\u6570 kill\u3002\u6ce8\u610f\u4fe1\u53f7\u7684\u53ef\u9760\u4e0e\u4e0d\u53ef\u9760\u548c\u53d1\u9001\u3001\u5b89\u88c5\u51fd\u6570\u65e0\u5173\uff0c\u53ea\u4e0e\u5177\u4f53\u7684\u4fe1\u53f7\u503c\u6709\u5173\uff0c\u5373 1~31 \u53f7\u4fe1\u53f7\u56fa\u5b9a\u4e3a\u4e0d\u53ef\u9760\u4fe1\u53f7\uff0c\u4e4b\u540e\u7684\u4fe1\u53f7\u4e3a\u53ef\u9760\u4fe1\u53f7\u3002<\/p>\n\n\n\n<p>\u53e6\u5916\uff0c\u975e\u5b9e\u65f6\u4fe1\u53f7\u90fd\u4e0d\u652f\u6301\u6392\u961f\uff0c\u90fd\u662f\u4e0d\u53ef\u9760\u4fe1\u53f7\uff1b\u5b9e\u65f6\u4fe1\u53f7\u90fd\u652f\u6301\u6392\u961f\uff0c\u90fd\u662f\u53ef\u9760\u4fe1\u53f7\u3002<\/p>\n\n\n\n<p class=\"has-text-align-center\">\u4fe1\u53f7\u5904\u7406\u65b9\u5f0f<\/p>\n\n\n\n<p>\uff081\uff09\u5ffd\u7565\u4fe1\u53f7\u3002\u5373\u5bf9\u4fe1\u53f7\u4e0d\u505a\u4efb\u4f55\u5904\u7406\uff0c\u4f46\u662f\u5176\u4e2d\u6709\u4e24\u4e2a\u4fe1\u53f7\u662f\u65e0\u6cd5\u88ab\u5ffd\u7565\u7684\uff08SIGKILL \u548c SIGSTOP\uff09\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u6355\u6349\u4fe1\u53f7\u3002\u5b9a\u4e49\u4fe1\u53f7\u5904\u7406\u51fd\u6570\uff0c\u5f53\u4fe1\u53f7\u53d1\u751f\u65f6\uff0c\u6267\u884c\u76f8\u5e94\u7684\u5904\u7406\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\uff083\uff09\u6267\u884c\u9ed8\u8ba4\u64cd\u4f5c\u3002Linux \u5bf9\u6bcf\u79cd\u4fe1\u53f7\u90fd\u89c4\u5b9a\u4e86\u9ed8\u8ba4\u64cd\u4f5c\uff0c\u6ce8\u610f\uff0c\u8fdb\u7a0b\u5bf9\u5b9e\u65f6\u4fe1\u53f7\u7684\u9ed8\u8ba4\u64cd\u4f5c\u662f\u8fdb\u7a0b\u7ec8\u6b62\u3002<\/p>\n\n\n\n<p class=\"has-text-align-center\">\u4fe1\u53f7\u53d1\u9001<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">       int kill(pid_t pid, int sig);\npid &gt; 0    \u5c06\u4fe1\u53f7\u4f20\u7ed9\u8fdb\u7a0b\u8bc6\u522b\u7801\u4e3a PID \u7684\u8fdb\u7a0b\npid = 0    \u5c06\u4fe1\u53f7\u4f20\u7ed9\u548c\u5f53\u524d\u8fdb\u7a0b\u76f8\u540c\u8fdb\u7a0b\u7ec4\u7684\u6240\u6709\u8fdb\u7a0b\npid == -1    \u5c06\u4fe1\u53f7\u5e7f\u64ad\u4f20\u9001\u7ed9\u7cfb\u7edf\u5185\u6240\u6709\u7684\u8fdb\u7a0b\npid &lt; 0    \u5c06\u4fe1\u53f7\u4f20\u7ed9\u8fdb\u7a0b\u7ec4\u8bc6\u522b\u7801\u4e3a PID \u7edd\u5bf9\u503c\u7684\u6240\u6709\u8fdb\u7a0b\n\n       unsigned alarm(unsigned seconds); \n\u8be5\u51fd\u6570\u7528\u4e8e\u8bbe\u7f6e SIGALRM\uff0c\u5728\u7ecf\u8fc7\u53c2\u6570 seconds \u79d2\u540e\u4f20\u9001\u7ed9\u5f53\u524d\u8fdb\u7a0b\u3002\u5982\u679c\u8bbe\u7f6e\u53c2\u6570\u4e3a 0\uff0c\u5219\u4e4b\u524d\u8bbe\u7f6e\u7684\u4fe1\u53f7\u4f1a\u88ab\u53d6\u6d88\uff0c\u5e76\u8fd4\u56de\u5269\u4e0b\u7684\u65f6\u95f4\n\n       void (*signal(int sig, void (*func)(int)))(int); \n\u8be5\u51fd\u6570\u6839\u636e sig \u6307\u5b9a\u7684\u4fe1\u53f7\u7f16\u7801\u6765\u8bbe\u7f6e\u8be5\u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570\uff0c\u5f53\u6307\u5b9a\u7684\u4fe1\u53f7\u5230\u8fbe\u65f6\u5c31\u4f1a\u8df3\u8f6c\u5230\u53c2\u6570 func \u6307\u5b9a\u7684\u51fd\u6570\u6267\u884c\n\u5982\u679c func \u4e0d\u662f\u51fd\u6570\u6307\u9488\uff0c\u5219\u5fc5\u987b\u8bbe\u7f6e\u4e3a\u4e0b\u5217\u4e24\u8005\u4e4b\u4e00\uff1a\nSIG_IGN    \u5ffd\u7565 sig \u4fe1\u53f7\nSIG_DFL    \u5c06 sig \u6307\u5b9a\u7684\u4fe1\u53f7\u91cd\u8bbe\u4e3a\u9ed8\u8ba4\u5904\u7406\u65b9\u5f0f\n\n       <strong>int<\/strong> <strong>sigaction(int<\/strong> signum<strong>,<\/strong> <strong>const<\/strong> <strong>struct<\/strong> <strong>sigaction<\/strong> <strong>*<\/strong>act<strong>,<\/strong> <strong>struct<\/strong> <strong>sigaction<\/strong> <strong>*<\/strong>oldact<strong>);<\/strong> \n<em>\/\/ sa_flags \u4e3a 0 ,\u5219\u4f7f\u7528\u7b2c\u4e00\u4e2a<\/em> \n<em>\/\/ sa_flags \u4e3a 1 ,\u5219\u4f7f\u7528\u7b2c\u4e8c\u4e2a<\/em>\nstruct sigaction\n{            \n    void     (*sa_handler)(int);            \n    void     (*sa_sigaction)(int, siginfo_t *, void *);            \n    sigset_t   sa_mask;            \n    int        sa_flags;            \n    void     (*sa_restorer)(void);\n}; \n<em>sa_mask<\/em> \u7528\u6765\u8bbe\u7f6e\u5728\u5904\u7406\u4fe1\u53f7\u65f6\u5c06 sa_mask \u6307\u5b9a\u7684\u4fe1\u53f7\u6401\u7f6e,\u76f4\u5230\u6267\u884c\u5b8c\u56de\u8c03\u51fd\u6570\u518d\u5904\u7406\noact \u53c2\u6570\u5982\u679c\u4e0d\u662f\u8bbe\u7f6e\u7684 NULL\uff0c\u5219\u8fd4\u56de\u539f\u6765\u4fe1\u53f7\u7684\u5904\u7406\u65b9\u5f0f\n\n       <strong>int<\/strong> <strong>sigqueue(pid_t<\/strong> pid<strong>,<\/strong> <strong>int<\/strong> sig<strong>,<\/strong> <strong>const<\/strong> <strong>union<\/strong> <strong>sigval<\/strong> value<strong>);<\/strong> \nunion sigval \n{\n    int   sival_int;\n    void *sival_ptr;\n}; \n\n       <strong>int<\/strong> <strong>setitimer(int<\/strong> which<strong>,<\/strong> <strong>const<\/strong> <strong>struct<\/strong> <strong>itimerval<\/strong> <strong>*<\/strong>new_value<strong>,<\/strong>                      <strong>struct<\/strong> <strong>itimerval<\/strong> <strong>*<\/strong>old_value<strong>);<\/strong> \nstruct itimerval\n {\n     \/\/ \u5468\u671f\n     struct timeval it_interval;\n     \/\/ \u9996\u6b21\n     struct timeval it_value;\n };\n struct timeval\n {\n     \/\/ \u79d2\n     time_t      tv_sec;\n     \/\/ \u5fae\u79d2\n     suseconds_t tv_usec;\n };\n\n       <strong>void<\/strong> <strong>abort(void);<\/strong> \nabort()\u51fd\u6570\u9996\u5148\u89e3\u9664\u8fdb\u7a0b\u5bf9SIGABRT\u4fe1\u53f7\u7684\u963b\u6b62\uff0c\u7136\u540e\u5411\u8c03\u7528\u8fdb\u7a0b\u53d1\u9001\u8be5\u4fe1\u53f7\u3002abort()\u51fd\u6570\u4f1a\u5bfc\u81f4\u8fdb\u7a0b\u7684\u5f02\u5e38\u7ec8\u6b62\u9664\u975eSIGABRT\u4fe1\u53f7\u88ab\u6355\u6349\u5e76\u4e14\u4fe1\u53f7\u5904\u7406\u53e5\u67c4\u6ca1\u6709\u8fd4\u56de\u3002<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/**\n * @author IYATT-yx\n * @date 2021-5-14\n * @brief kill \u51fd\u6570\u4f7f\u7528\u793a\u4f8b\n *\/\n#define _GNU_SOURCE\n#include &lt;signal.h>\n#include &lt;stdio.h>\n#include &lt;sys\/types.h>\n#include &lt;unistd.h>\n\nint main(void)\n{\n    pid_t pid  = fork();\n\n    \/\/ \u7236\u8fdb\u7a0b\n    if (pid > 0)\n    {\n        \/\/ \u7b49\u5f85 3 \u79d2\u540e\u6d88\u706d\u6b7b\u5faa\u73af\u7684\u5b50\u8fdb\u7a0b\n        sleep(3);\n\n        \/\/ \u7236\u8fdb\u7a0b\u4e2d fork() \u8fd4\u56de\u503c\u4e3a\u5b50\u8fdb\u7a0b\u7684 ID\n        \/\/ 9 \u53f7 SIGKILL \u4fe1\u53f7\u4e0d\u53ef\u6355\u6349\u548c\u5ffd\u7565\uff0c\u6536\u5230\u8be5\u4fe1\u53f7\u7684\u8fdb\u7a0b\u4f1a\u88ab\u65e0\u6761\u4ef6\u6740\u6b7b\n        kill(pid, SIGKILL);\n    }\n    \/\/ \u5b50\u8fdb\u7a0b\n    else if (pid  == 0)\n    {\n        int counter = 0;\n\n        while (1)\n        {\n            ++counter;\n\n            printf(\"\u8ba1\u6570\uff1a %d\\n\", counter);\n            sleep(1);\n        }\n    }\n    else\n    {\n        perror(\"fork error\");\n    }\n}<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"549\" height=\"170\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-14-024752.png\" alt=\"\" class=\"wp-image-843 lazyload\" data-srcset=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-14-024752.png 549w, https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-14-024752-300x93.png 300w\" data-sizes=\"(max-width: 549px) 100vw, 549px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 549px; --smush-placeholder-aspect-ratio: 549\/170;\" \/><\/figure>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/**\n * @author IYATT-yx\n * @date 2021-5-14\n * @brief alarm \u548c signal \u51fd\u6570\u7684\u4f7f\u7528\u793a\u4f8b\n *\/\n#include &lt;unistd.h>\n#include &lt;signal.h>\n#include &lt;stdio.h>\n\nvoid handler(int sig)\n{\n    printf(\"\u6355\u6349\u5230\u4fe1\u53f7: %d\\n\", sig);\n}\n\nint main(void)\n{\n    \/\/ \u6355\u6349 SIGALRM \u5e76\u6267\u884c\u8bbe\u5b9a\u7684\u51fd\u6570\n    signal(SIGALRM, handler);\n\n    \/\/ 3\u79d2\u540e\u53d1\u9001 SIGALRM \u4fe1\u53f7\n    alarm(3);\n\n    \/\/ \u8ba1\u6570\u5668\n    int counter  = 0;\n\n    \/\/ \u8ba1\u6570\n    while (counter &lt; 5)\n    {\n        ++counter;\n\n        printf(\"%d\\n\", counter);\n        sleep(1);\n    }\n}<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"524\" height=\"170\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-14-030242.png\" alt=\"\" class=\"wp-image-844 lazyload\" data-srcset=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-14-030242.png 524w, https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-14-030242-300x97.png 300w\" data-sizes=\"(max-width: 524px) 100vw, 524px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 524px; --smush-placeholder-aspect-ratio: 524\/170;\" \/><\/figure>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/**\n * @author IYATT-yx\n * @date 2021-5-15\n * @brief sigaction \u7684\u4f7f\u7528\n *      \u6309 Ctrl + \\ \u5411\u7a0b\u5e8f\u53d1\u9001 SIGQUIT \u4fe1\u53f7\u4f1a\u88ab\u6355\u6349\u5230\n *\/\n#define _GNU_SOURCE\n#include &lt;stdio.h>\n#include &lt;signal.h>\n#include &lt;unistd.h>\n\nvoid handler(int sig)\n{\n    printf(\"\u6355\u6349\u5230\u4fe1\u53f7\uff1a%d\\n\", sig);\n}\n\nint main(void)\n{\n    struct sigaction sig;\n    sig.sa_flags = 0;\n    sigemptyset(&amp;sig.sa_mask);\n    sig.sa_handler = handler;\n    sigaction(SIGQUIT, &amp;sig, NULL);\n\n    while (1)\n    {\n        sleep(1);\n    }\n}<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"566\" height=\"180\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-15-172522.png\" alt=\"\" class=\"wp-image-848 lazyload\" data-srcset=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-15-172522.png 566w, https:\/\/blog.iyatt.com\/wp-content\/uploads\/2021\/05\/\u5c4f\u5e55\u622a\u56fe-2021-05-15-172522-300x95.png 300w\" data-sizes=\"(max-width: 566px) 100vw, 566px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 566px; --smush-placeholder-aspect-ratio: 566\/180;\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">\u4fe1\u53f7\u96c6<\/p>\n\n\n\n<p>\u4fe1\u53f7\u96c6\u88ab\u5b9a\u4e49\u4e3a\u4e00\u79cd\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">typedef struct\n{\n    unsigned long sig[_NSIG_WORDS];\n} sigset_t;\n<\/pre>\n\n\n\n<p>\u4fe1\u53f7\u96c6\u7528\u6765\u63cf\u8ff0\u4fe1\u53f7\u7684\u96c6\u5408\uff0cLinux \u6240\u652f\u6301\u7684\u6240\u6709\u4fe1\u53f7\u53ef\u4ee5\u5168\u90e8\u6216\u90e8\u5206\u5730\u51fa\u73b0\u5728\u4fe1\u53f7\u96c6\u4e2d\uff0c\u4e3b\u8981\u4e0e\u4fe1\u53f7\u963b\u585e\u76f8\u5173\u5730\u51fd\u6570\u914d\u5408\u4f7f\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">       <strong>int<\/strong> <strong>sigemptyset(sigset_t<\/strong> <strong>*<\/strong>set<strong>);<\/strong>\n---- \u7528\u4e8e\u521d\u59cb\u5316\u4fe1\u53f7\u96c6\uff0c\u5c06 set \u6e05\u7a7a\n       <strong>int<\/strong> <strong>sigfillset(sigset_t<\/strong> <strong>*<\/strong>set<strong>);<\/strong> \n---- \u7528\u4e8e\u5c06\u6240\u6709\u4fe1\u53f7\u52a0\u5165\u4fe1\u53f7\u96c6\n       <strong>int<\/strong> <strong>sigaddset(sigset_t<\/strong> <strong>*<\/strong>set<strong>,<\/strong> <strong>int<\/strong> signum<strong>);<\/strong> \n---- \u7528\u4e8e\u589e\u52a0\u4e00\u4e2a\u4fe1\u53f7\u5230\u4fe1\u53f7\u96c6\n       <strong>int<\/strong> <strong>sigdelset(sigset_t<\/strong> <strong>*<\/strong>set<strong>,<\/strong> <strong>int<\/strong> signum<strong>);<\/strong> \n---- \u7528\u4e8e\u4ece\u4fe1\u53f7\u96c6\u4e2d\u5220\u9664\u4e00\u4e2a\u4fe1\u53f7\n       <strong>int<\/strong> <strong>sigismember(const<\/strong> <strong>sigset_t<\/strong> <strong>*<\/strong>set<strong>,<\/strong> <strong>int<\/strong> signum<strong>);<\/strong> \n---- \u6d4b\u8bd5\u67d0\u4e2a\u4fe1\u53f7\u662f\u5426\u5df2\u52a0\u5165\u4fe1\u53f7\u96c6\u91cc<\/pre>\n\n\n\n<pre id=\"block-34dcb577-1868-448a-9522-6c261fea3866\" class=\"wp-block-preformatted\"><\/pre>\n\n\n\n<p class=\"has-text-align-center\">\u4f7f\u7528\u4fe1\u53f7\u6ce8\u610f\u4e8b\u9879<\/p>\n\n\n\n<p>\uff081\uff09\u9632\u6b62\u4e0d\u8be5\u4e22\u5931\u5730\u4fe1\u53f7\u4e22\u5931\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u7a0b\u5e8f\u5730\u53ef\u79fb\u690d\u6027\u3002\u8003\u8651\u5230\u7a0b\u5e8f\u5730\u53ef\u79fb\u690d\u6027\uff0c\u5e94\u8be5\u5c3d\u91cf\u91c7\u7528 POSIX \u4fe1\u53f7\u51fd\u6570\uff0cPOSIX \u4fe1\u53f7\u51fd\u6570\u4e3b\u8981\u5206\u4e3a\u4e24\u7c7b\u3002<\/p>\n\n\n\n<p>\u2460 POSIX 1003.1 \u4fe1\u53f7\u51fd\u6570\u5305\u542b kill\u3001sigaction\u3001sigaddset\u3001sigdelset\u3001sigemptyset\u3001sigfillset\u3001sigismember\u3001sigpending\u3001sigprocmask \u548c sigsuspend\u3002<\/p>\n\n\n\n<p>\u2461 POSIX 1003.1b \u4fe1\u53f7\u51fd\u6570\uff1a\u5728\u4fe1\u53f7\u5730\u5b9e\u65f6\u6027\u65b9\u9762\u5bf9 \u2460 \u505a\u4e86\u6269\u5c55\uff0c\u5305\u62ec sigqueue\u3001sigtimedwait \u548c sigwaitinfo 3 \u4e2a\u51fd\u6570\uff0c\u5176\u4e2d sigqueue \u4e3b\u8981\u5bf9\u4fe1\u53f7\u53d1\u9001\uff0c\u800c \u56db\u4e2atimedwait \u548c sigwaitinfo \u4e3b\u8981\u7528\u4e8e\u53d6\u4ee3 sigsuspend\u3002<\/p>\n\n\n\n<p>\uff083\uff09\u7a0b\u5e8f\u5730\u7a33\u5b9a\u6027\u3002\u4e3a\u4e86\u589e\u5f3a\u7a0b\u5e8f\u5730\u7a33\u5b9a\u6027\uff0c\u5728\u4fe1\u53f7\u5904\u7406\u7a0b\u5e8f\u4e2d\u5e94\u5f53\u4f7f\u7528\u53ef\u518d\u5165\u51fd\u6570\uff08\u4e00\u4e2a\u53ef\u4ee5\u88ab\u591a\u4e2a\u4efb\u52a1\u8c03\u7528\u5730\u8fc7\u7a0b\uff0c\u4efb\u52a1\u5728\u8c03\u7528\u65f6\u4e0d\u5fc5\u62c5\u5fc3\u6570\u636e\u662f\u5426\u51fa\u9519\uff09\u3002\u56e0\u4e3a\u8fdb\u7a0b\u5728\u6536\u5230\u4fe1\u53f7\u540e\uff0c\u5c31\u4f1a\u8df3\u8f6c\u5230\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u53bb\u6267\u884c\u3002\u5982\u679c\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4e2d\u4f7f\u7528\u4e86\u4e0d\u53ef\u91cd\u5165\u7684\u51fd\u6570\uff0c\u90a3\u4e48\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u53ef\u80fd\u4f1a\u4fee\u6539\u539f\u6765\u8fdb\u7a0b\u4e2d\u4e0d\u5e94\u8be5\u88ab\u4fee\u6539\u7684\u6570\u636e\uff0c\u8fd9\u6837\u8fdb\u7a0b\u4ece\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4e2d\u8fd4\u56de\u63a5\u7740\u6267\u884c\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e0d\u53ef\u9884\u6599\u7684\u540e\u679c\u3002\u4e0d\u53ef\u518d\u5165\u51fd\u6570\u5728\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4e2d\u88ab\u89c6\u4e3a\u4e0d\u5b89\u5168\u51fd\u6570\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u4f7f\u7528\u9759\u6001\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5982 getlogin\u3001gmtime&#8230;&#8230;<\/li><li>\u5728\u51fd\u6570\u5b9e\u73b0\u65f6\uff0c\u8c03\u7528\u4e86 malloc \u6216\u8005 free\u3002<\/li><li>\u5728\u51fd\u6570\u5b9e\u73b0\u65f6\u4f7f\u7528\u4e86\u6807\u51c6 I\/O \u5e93\u51fd\u6570\uff0c\u5982 _exit\u3001access\u3001alarm&#8230;&#8230;<\/li><\/ul>\n\n\n\n<p>\u5373\u4f7f\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4f7f\u7528\u7684\u90fd\u662f\u201c\u5b89\u5168\u51fd\u6570\u201d\uff0c\u540c\u6837\u8981\u6ce8\u610f\u5728\u8fdb\u5165\u5904\u7406\u51fd\u6570\u65f6\uff0c\u8981\u5148\u4fdd\u5b58 errno \u7684\u503c\uff0c\u7ed3\u675f\u65f6\u518d\u6062\u590d\u539f\u503c\uff0c\u8fd9\u662f\u56e0\u4e3a\u5728\u4fe1\u53f7\u5904\u7406\u8fc7\u7a0b\u4e2d\uff0cerrno \u7684\u503c\u968f\u65f6\u53ef\u80fd\u88ab\u6539\u53d8\u3002<\/p>\n\n\n\n<h2 class=\"has-text-align-center wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97\"><\/span>\u6d88\u606f\u961f\u5217<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u6d88\u606f\u961f\u5217\uff08\u4e5f\u53eb\u62a5\u6587\u961f\u5217\uff09\u80fd\u591f\u514b\u670d\u65e9\u671f UNIX \u901a\u4fe1\u673a\u5236\u7684\u4e00\u4e9b\u7f3a\u70b9\u3002\u4f5c\u4e3a\u65e9\u671f UNIX \u901a\u4fe1\u673a\u5236\u4e4b\u4e00\u7684\u4fe1\u53f7\u80fd\u591f\u4f20\u9001\u7684\u4fe1\u606f\u91cf\u6709\u9650\uff0c\u540e\u6765\u867d\u7136 POSIX 1003.1b \u5728\u4fe1\u53f7\u7684\u5b9e\u65f6\u6027\u65b9\u9762\u505a\u4e86\u62d3\u5e7f\uff0c\u4f7f\u5f97\u4fe1\u53f7\u5728\u4f20\u9012\u4fe1\u606f\u91cf\u65b9\u9762\u6709\u4e86\u76f8\u5f53\u7a0b\u5ea6\u7684\u6539\u8fdb\u3002\u4f46\u662f\u4fe1\u53f7\u66f4\u50cf\u662f\u201c\u5373\u65f6\u201d\u7684\u901a\u4fe1\u65b9\u5f0f\uff0c\u5b83\u8981\u6c42\u63a5\u6536\u4fe1\u53f7\u7684\u8fdb\u7a0b\u5728\u67d0\u4e2a\u65f6\u95f4\u8303\u56f4\u5185\u5bf9\u4fe1\u53f7\u505a\u51fa\u53cd\u5e94\uff0c\u56e0\u6b64\u8be5\u4fe1\u53f7\u6700\u591a\u5728\u63a5\u6536\u4fe1\u53f7\u8fdb\u7a0b\u7684\u58f0\u660e\u5468\u671f\u5185\u624d\u6709\u610f\u4e49\uff0c\u4fe1\u53f7\u6240\u4f20\u9012\u7684\u4fe1\u606f\u662f\u63a5\u8fd1\u4e8e\u968f\u8fdb\u7a0b\u6301\u7eed\u7684\u6982\u5ff5\uff0c\u7ba1\u9053\u548c\u6709\u540d\u7ba1\u9053\u5219\u662f\u5178\u578b\u7684\u968f\u8fdb\u7a0b\u6301\u7eed IPC\uff0c\u5e76\u4e14\u53ea\u80fd\u4f20\u9001\u65e0\u683c\u5f0f\u7684\u5b57\u8282\u6d41\uff0c\u8fd9\u65e0\u7591\u4f1a\u7ed9\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u5e26\u6765\u4e0d\u4fbf\uff0c\u53e6\u5916\uff0c\u5b83\u7684\u7f13\u51b2\u533a\u5927\u5c0f\u4e5f\u53d7\u5230\u9650\u5236\u3002<\/p>\n\n\n\n<p>\u6d88\u606f\u961f\u5217\u5c31\u662f\u4e00\u4e2a\u6d88\u606f\u7684\u94fe\u8868\u3002\u53ef\u4ee5\u628a\u6d88\u606f\u770b\u4f5c\u8bb0\u5f55\uff0c\u5177\u6709\u7279\u5b9a\u7684\u683c\u5f0f\u548c\u7279\u5b9a\u7684\u4f18\u5148\u7ea7\u3002\u5bf9\u6d88\u606f\u961f\u5217\u6709\u5199\u6743\u9650\u7684\u8fdb\u7a0b\u53ef\u4ee5\u6309\u7167\u4e00\u5b9a\u7684\u89c4\u5219\u6dfb\u52a0\u65b0\u6d88\u606f\uff0c\u5bf9\u6d88\u606f\u961f\u5217\u6709\u8bfb\u6743\u9650\u7684\u8fdb\u7a0b\u5219\u53ef\u4ee5\u4ece\u6d88\u606f\u961f\u5217\u4e2d\u8bfb\u8d70\u6d88\u606f\uff0c\u6d88\u606f\u961f\u5217\u662f\u968f\u5185\u6838\u6301\u7eed\u7684\u3002<\/p>\n\n\n\n<p>\u76ee\u524d\u4e3b\u8981\u6709\u4e24\u79cd\u7c7b\u578b\u7684\u6d88\u606f\u961f\u5217\u2014\u2014POSIX \u6d88\u606f\u961f\u5217\u548c System V \u6d88\u606f\u961f\u5217\u3002System V \u6d88\u606f\u961f\u5217\u76ee\u524d\u88ab\u5927\u91cf\u4f7f\u7528\uff0c\u8003\u8651\u5230\u7a0b\u5e8f\u7684\u53ef\u79fb\u690d\u6027\uff0c\u65b0\u5f00\u53d1\u7684\u5e94\u7528\u7a0b\u5e8f\u5e94\u5c3d\u91cf\u4f7f\u7528 POSIX \u6d88\u606f\u961f\u5217\u3002<\/p>\n\n\n\n<p class=\"has-text-align-center\">\u6d88\u606f\u961f\u5217\u57fa\u7840\u7406\u8bba<\/p>\n\n\n\n<p>System V \u6d88\u606f\u961f\u5217\u662f\u968f\u5185\u6838\u6301\u7eed\u7684\uff0c\u53ea\u6709\u5728\u5185\u6838\u91cd\u542f\u6216\u8005\u663e\u793a\u5220\u9664\u4e00\u4e2a\u6d88\u606f\u961f\u5217\u7684\u65f6\u5019\u624d\u4f1a\u771f\u6b63\u88ab\u5220\u9664\u3002\u56e0\u6b64\u7cfb\u7edf\u4e2d\u8bb0\u5f55\u6d88\u606f\u961f\u5217\u7684\u6570\u636e\u7ed3\u6784\uff08struct ipc_ids msg_ids\uff09\u4f4d\u4e8e\u5185\u6838\u4e2d\uff0c\u7cfb\u7edf\u4e2d\u7684\u6240\u6709\u6d88\u606f\u961f\u5217\u90fd\u53ef\u4ee5\u5728\u7ed3\u6784 msg_ids \u4e2d\u627e\u5230\u8bbf\u95ee\u5165\u53e3\u3002<\/p>\n\n\n\n<p>\u6d88\u606f\u961f\u5217\u5c31\u662f\u4e00\u4e2a\u6d88\u606f\u7684\u94fe\u8868\u3002\u6bcf\u4e2a\u6d88\u606f\u961f\u5217\u90fd\u6709\u4e00\u4e2a\u961f\u5217\u5934\uff0c\u7528\u7ed3\u6784 struct msg_queue \u6765\u63cf\u8ff0\u3002\u961f\u5217\u5934\u4e2d\u5305\u542b\u4e86\u8be5\u6d88\u606f\u961f\u5217\u7684\u5927\u91cf\u4fe1\u606f\uff0c\u5305\u62ec\u6d88\u606f\u961f\u5217\u952e\u503c\u3001\u7528\u6237 ID\u3001\u7ec4 ID \u548c\u6d88\u606f\u961f\u5217\u4e2d\u6d88\u606f\u6570\u76ee\u7b49\uff0c\u751a\u81f3\u8bb0\u5f55\u4e86\u6700\u8fd1\u5bf9\u6d88\u606f\u961f\u5217\u8bfb\u5199\u8fdb\u7a0b\u7684 ID\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">struct kern_ipc_perm\n{\n    key_t key;\n    uid_t uid;\n    gid_t gid;\n    uid_t cuid;\n    gid_t cgid;\n    mode_t mode;\n    unsigned long seq;\n};<\/pre>\n\n\n\n<p class=\"has-text-align-center\">\u4f7f\u7528\u6d88\u606f\u961f\u5217<\/p>\n\n\n\n<p>\u5bf9\u6d88\u606f\u961f\u5217\u7684\u64cd\u4f5c\u6709\u4e0b\u9762 3 \u79cd\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\uff081\uff09\u6253\u5f00\u6216\u521b\u5efa\u6d88\u606f\u961f\u5217\u3002\u6d88\u606f\u961f\u5217\u7684\u5185\u6838\u6301\u7eed\u6027\u8981\u6c42\u6bcf\u4e2a\u6d88\u606f\u961f\u5217\u90fd\u5728\u7cfb\u7edf\u8303\u56f4\u5185\u5bf9\u5e94\u552f\u4e00\u7684\u952e\u503c\uff0c\u6240\u4ee5\uff0c\u8981\u83b7\u5f97\u4e00\u4e2a\u6d88\u606f\u961f\u5217\u7684\u63cf\u8ff0\u5b57\uff08\u7531\u5728\u7cfb\u7edf\u8303\u56f4\u5185\u552f\u4e00\u7684\u952e\u503c\u751f\u6210\u7684\uff0c\u800c\u952e\u503c\u53ef\u4ee5\u770b\u4f5c\u5bf9\u5e94\u7cfb\u7edf\u5185\u7684\u4e00\u6761\u8def\u5f84\u3002\uff09\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u8be5\u6d88\u606f\u961f\u5217\u7684\u952e\u503c\u5373\u53ef\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u8bfb\u5199\u64cd\u4f5c\u3002\u6d88\u606f\u8bfb\u5199\u64cd\u4f5c\u975e\u5e38\u7b80\u5355\uff0c\u5bf9\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u6bcf\u4e2a\u6d88\u606f\u90fd\u7c7b\u4f3c\u5982\u4e0b\u7684\u6570\u636e\u7ed3\u6784\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">struct msgbuf\n{\n    long mtype;\n    char mtext[1];\n};<\/pre>\n\n\n\n<p>mtype \u4ee3\u8868\u6d88\u606f\u7c7b\u578b\uff0c\u4ece\u6d88\u606f\u961f\u5217\u79cd\u8bfb\u53d6\u6d88\u606f\u7684\u4e00\u4e2a\u91cd\u8981\u4f9d\u636e\u5c31\u662f\u6d88\u606f\u7684\u7c7b\u578b\uff1bmtext \u8868\u793a\u6d88\u606f\u5185\u5bb9\uff0c\u957f\u5ea6\u4e0d\u4e00\u5b9a\u4e3a 1.\u56e0\u6b64\uff0c\u5bf9\u4e8e\u53d1\u9001\u6d88\u606f\u6765\u8bf4\uff0c\u9700\u8981\u9884\u7f6e\u4e00\u4e2a msgbuf \u7f13\u51b2\u533a\u5e76\u5199\u5165\u6d88\u606f\u7c7b\u578b\u548c\u5185\u5bb9\uff0c\u8c03\u7528\u76f8\u5e94\u7684\u53d1\u9001\u51fd\u6570\u5373\u53ef\uff1b\u5bf9\u8bfb\u53d6\u6d88\u606f\u6765\u8bf4\uff0c\u9996\u5148\u5206\u914d\u8fd9\u6837\u4e00\u4e2a msgbuf \u7f13\u51b2\u533a\uff0c\u7136\u540e\u628a\u6d88\u606f\u8bfb\u5165\u8be5\u7f13\u51b2\u533a\u5373\u53ef\u3002<\/p>\n\n\n\n<p>\uff083\uff09\u83b7\u5f97\u6216\u8bbe\u7f6e\u6d88\u606f\u961f\u5217\u5c5e\u6027\u3002\u6d88\u606f\u961f\u5217\u7684\u6d88\u606f\u57fa\u672c\u4e0a\u4fdd\u5b58\u5728\u6d88\u606f\u961f\u5217\u5934\u4e2d\uff0c\u56e0\u6b64\uff0c\u53ef\u4ee5\u5206\u914d\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u6d88\u606f\u961f\u5217\u5934\u7684\u7ed3\u6784\uff0c\u6765\u8fd4\u56de\u6d88\u606f\u961f\u5217\u7684\u5c5e\u6027\uff0c\u540c\u6837\u53ef\u4ee5\u8bbe\u7f6e\u8be5\u6570\u636e\u7ed3\u6784\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u4e2a\u5927\u578b\u5e94\u7528\u7a0b\u5e8f\uff0c\u5f80\u5f80\u9700\u8981\u4f17\u591a\u8fdb\u7a0b\u534f\u4f5c\uff0c\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u91cd\u8981\u6027\u663e\u800c\u6613\u89c1\u3002Linux \u4e0b\u7684\u8fdb\u7a0b\u901a\u4fe1\u624b\u6bb5\u57fa\u672c\u4e0a\u662f\u4ece U [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"zakra_page_container_layout":"customizer","zakra_page_sidebar_layout":"customizer","zakra_remove_content_margin":false,"zakra_sidebar":"customizer","zakra_transparent_header":"customizer","zakra_logo":0,"zakra_main_header_style":"default","zakra_menu_item_color":"","zakra_menu_item_hover_color":"","zakra_menu_item_active_color":"","zakra_menu_active_style":"","zakra_page_header":true,"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[1,607],"tags":[],"class_list":["post-707","post","type-post","status-publish","format-standard","hentry","category-all","category-linux-"],"modified_by":"IYATT-yx","_links":{"self":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/posts\/707","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=707"}],"version-history":[{"count":0,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/posts\/707\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=707"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=707"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=707"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}