{"id":52093,"date":"2024-12-03T16:10:56","date_gmt":"2024-12-03T08:10:56","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52093\/"},"modified":"2024-12-03T16:10:56","modified_gmt":"2024-12-03T08:10:56","slug":"linux%e6%93%8d%e4%bd%9c%e6%96%87%e4%bb%b6%e7%9a%84%e5%ba%95%e5%b1%82%e7%b3%bb%e7%bb%9f%e6%80%8e%e4%b9%88%e8%b0%83%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52093\/","title":{"rendered":"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528<\/h1>\n<p>\u5728IT\u884c\u4e1a\u8fd9\u4e2a\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u5f88\u5feb\u7684\u884c\u4e1a\uff0c\u53ea\u6709\u4e0d\u505c\u6b62\u7684\u5b66\u4e60\uff0c\u624d\u4e0d\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u5982\u679c\u4f60\u662f\u6587\u7ae0\u5b66\u4e60\u8005\uff0c\u90a3\u4e48\u672c\u6587\u300aLinux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u300b\u5c31\u5f88\u9002\u5408\u4f60\uff01\u672c\u7bc7\u5185\u5bb9\u4e3b\u8981\u5305\u62ec##content_title##\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n<p>linux\u64cd\u4f5c\u7cfb\u7edf\u5949\u884c\u4e00\u5207\u7686\u6587\u4ef6\u7684\u7406\u5ff5\uff0c\u6240\u6709\u6587\u4ef6\u8bbe\u5907\u51e0\u4e4e\u90fd\u53ef\u4ee5\u7528\u4e00\u5957\u7cfb\u7edf\u8c03\u7528\u5373open()\/close()\/write()\/read()\u7b49\u6765\u64cd\u4f5c\u3002\u7cfb\u7edf\u8c03\u7528\u548cC\u5e93\u8c03\u7528\u64cd\u4f5c\u6587\u4ef6\u7c7b\u4f3c\u3002Linux\u81ea\u5e26\u7684man\u624b\u518c\u662f\u6700\u6743\u5a01\u7684\u3002\u901a\u8fc7\u67e5\u770bman\u624b\u518c\u6765\u67e5\u770b\u7cfb\u7edf\u8c03\u7528\u7528\u6cd5\u3002<\/p>\n<p><strong>\u4ee3\u53f7 &amp;mdash;&amp;mdash; \u4ee3\u8868\u7684\u542b\u4e49<\/strong><\/p>\n<ul>\n<li>\n<p>1 &amp;mdash;&amp;mdash; \u7528\u6237\u5728shell\u73af\u5883\u4e0b\u53ef\u64cd\u4f5c\/\u53ef\u6267\u884c\u7684\u547d\u4ee4<\/p>\n<\/li>\n<li>\n<p>2 &amp;mdash;&amp;mdash; \u7cfb\u7edf\u5185\u6838\u53ef\u8c03\u7528\u7684\u51fd\u6570\u4e0e\u5de5\u5177<\/p>\n<\/li>\n<li>\n<p>3 &amp;mdash;&amp;mdash; \u4e00\u4e9b\u5e38\u7528\u7684\u51fd\u6570\u4e0e\u51fd\u6570\u5e93\uff0c\u5927\u90e8\u5206C\u7684\u51fd\u6570\u5e93<\/p>\n<\/li>\n<li>\n<p>4 &amp;mdash;&amp;mdash; \u8bbe\u5907\u6587\u4ef6\u7684\u8bf4\u660e\uff0c\u901a\u5e38\u662f\u5728 \/dev\u4e0b\u7684\u8bbe\u5907<\/p>\n<\/li>\n<li>\n<p>5 &amp;mdash;&amp;mdash; \u914d\u7f6e\u6587\u4ef6\u6216\u67d0\u4e9b\u6587\u4ef6\u7684\u683c\u5f0f<\/p>\n<\/li>\n<li>\n<p>6 &amp;mdash;&amp;mdash; \u6e38\u620f<\/p>\n<\/li>\n<li>\n<p>7 &amp;mdash;&amp;mdash; \u7ba1\u7406\u4e0e\u534f\u8bae\u7b49\uff0c\u4f8b\u5982Linux\u6587\u4ef6\u7cfb\u7edf\u3001\u7f51\u7edc\u534f\u8bae\u7b49<\/p>\n<\/li>\n<li>\n<p>8 &amp;mdash;&amp;mdash; \u7cfb\u7edf\u7ba1\u7406\u5458\u53ef\u7528\u7684\u547d\u4ee4<\/p>\n<\/li>\n<li>\n<p>9 &amp;mdash;&amp;mdash; \u4e0eKernel\u6709\u5173\u7684\u6587\u4ef6<\/p>\n<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff0c\u7cfb\u7edf\u7684\u5934\u6587\u4ef6\u5728Linux\u4e2d\u4e00\u822c\u5b58\u653e\u5728<code>\/usr\/include<\/code>\u76ee\u5f55\u4e0b\uff1b\u4e0b\u9762\u5305\u542b\u7684\u4e00\u4e9b\u5934\u6587\u4ef6\u6709\u7684\u5e26\u4e86sys\uff0c\u5176\u5b9e\u662finclude\u5e95\u4e0b\u7684\u5b50\u76ee\u5f55\u4e2d\u7684\u5934\u6587\u4ef6<\/p>\n<h3>open\uff08\uff09&amp;mdash;&amp;mdash;\u6253\u5f00\u6216\u8005\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544663f4eb.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe\" \/><\/p>\n<p><strong>\u8fd4\u56de\u503c\u7c7b\u578b\uff1a<\/strong> int&amp;mdash;&amp;mdash;\u6587\u4ef6\u63cf\u8ff0\u7b26fd\uff0c\u6bcf\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\uff0c\u5c31\u4f1a\u5f97\u5230\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u6574\u5f62\u7684\uff0c\u6211\u4eec\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u3002<\/p>\n<ul>\n<li>\n<p>\u5931\u8d25\uff1a-1<\/p>\n<\/li>\n<li>\n<p>\u6210\u529f\uff1a&gt;= 0\uff0c\u5373\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1b<\/p>\n<\/li>\n<li>\n<p>mode_t\u662f\u4e00\u4e2a\u7c7b\u578b\u522b\u540d\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u4e00\u4e2a\u6709\u7b26\u53f7\u7684\u6574\u6570\uff0c\u5bf9open\u51fd\u6570\u800c\u8a00\uff0c\u4ec5\u4ec5\u5f53\u521b\u5efa\u65b0\u6587\u4ef6\u65f6\u624d\u4f7f\u7528\u7b2c\u4e09\u4e2a\u53c2\u6570<\/p>\n<\/li>\n<\/ul>\n<p>flag\uff1a\u6253\u5f00\u6807\u5fd7<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446643442.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe1\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe1\" \/><\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong> \u8fd9\u4e9b\u5176\u5b9e\u90fd\u662f\u5b9a\u4e49\u7684\u4e00\u4e9b\u5b8f\uff0c\u5f53\u9700\u8981\u4f7f\u7528\u5230\u591a\u4e2a\u53c2\u6570\u65f6\uff0c\u4f7f\u7528\u6309\u4f4d\u6216\u201c <code>|<\/code> \u201d\u6784\u6210\u591a\u4e2aflag\u53c2\u6570<\/p>\n<p>\u4e5f\u53ef\u8ddf\u968f\u4e0b\u9762\u7684\u65b9\u5f0f\u4e00\u8d77\u4f7f\u7528\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544664681b.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe2\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe2\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544664a422.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe3\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe3\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544664b9e3.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe4\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe4\" \/><\/p>\n<p>\u5176\u4ed6\u4e0d\u4e00\u4e00\u4ecb\u7ecd\uff0c\u9700\u8981\u4f7f\u7528\u65f6\u81ea\u67e5\u3002<\/p>\n<h3>write\uff08\uff09<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544664e7f5.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe5\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe5\" \/><\/p>\n<p><strong>\u8fd4\u56de\u503c<\/strong>\uff1a<\/p>\n<ul>\n<li>\n<p>\u82e5\u6210\u529f\u4e3a\u5df2\u7ecf\u5199\u5165\u7684\u5b57\u8282\u6570\uff1b<\/p>\n<\/li>\n<li>\n<p>\u82e5\u51fa\u9519\u4e3a-1\uff1b<\/p>\n<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a\u8ba1\u5212\u5199\u5165\u7684\u5b57\u8282\u6570\u548c\u51fd\u6570\u7684\u8fd4\u56de\u503c\u4e0d\u76f8\u7b49\u65f6\uff0c\u8868\u793a\u5199\u5165\u51fa\u73b0\u4e86\u9519\u8bef\uff0c\u53ef\u4ee5\u7528\u6765\u68c0\u9a8c\u5199\u5165\u662f\u5426\u6210\u529f\uff1b<\/p>\n<p><strong>\u53c2\u6570\uff1a<\/strong><\/p>\n<ul>\n<li>\n<p><code>fd<\/code>\uff1a\u5199\u5165\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1b<\/p>\n<\/li>\n<li>\n<p><code>buf<\/code>\uff1a\u5b58\u653e\u5f85\u5199\u6570\u636e\u7684\u7f13\u5b58\uff1b<\/p>\n<\/li>\n<li>\n<p><code>count<\/code>\uff1a\u8981\u6c42\u5199\u5165\u4e00\u6b21\u6570\u636e\u7684\u5b57\u8282\u6570\uff1b<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<p>\u5bf9\u4e8e\u666e\u901a\u6587\u4ef6\uff0c\u5199\u64cd\u4f5c\u4ece\u6587\u4ef6\u7684\u5f53\u524d\u4f4d\u79fb\u91cf\u5904\u5f00\u59cb\uff0c\u82e5\u5982\u679c\u5728\u6253\u5f00\u8be5\u6587\u4ef6\u65f6\uff0c\u6307\u5b9a\u4e86O_APPEND\u9009\u62e9\u9879\uff0c\u5219\u5728\u6bcf\u6b21\u5199\u64cd\u4f5c\u4e4b\u524d\uff0c\u5c06\u6587\u4ef6\u4f4d\u79fb\u91cf\u8bbe\u7f6e\u5728\u6587\u4ef6\u7684\u5f53\u524d\u7ed3\u5c3e\u5904\u3002\u5728\u4e00\u6b21\u6210\u529f\u5199\u4e4b\u540e\uff0c\u8be5\u6587\u4ef6\u4f4d\u79fb\u91cf\u589e\u52a0\u5b9e\u9645\u5199\u7684\u5b57\u8282\u6570\u3002<\/p>\n<h3>read\uff08\uff09<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446651925.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe6\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe6\" \/><\/p>\n<p><strong>\u8fd4\u56de\u503c<\/strong> \uff1a\u8bfb\u5230\u7684\u5b57\u8282\u6570<\/p>\n<ul>\n<li>\n<p>\u82e5\u5df2\u5230\u6587\u4ef6\u5c3e\u4e3a0\uff1b\u82e5\u51fa\u9519\u4e3a-1\uff1b<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u53c2\u6570<\/strong><\/p>\n<ul>\n<li>\n<p><code>fd<\/code>\uff1a\u8bfb\u53d6\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1b<\/p>\n<\/li>\n<li>\n<p><code>buf<\/code>\uff1a\u5b58\u653e\u8bfb\u53d6\u6570\u636e\u7684\u7f13\u5b58\uff1b<\/p>\n<\/li>\n<li>\n<p><code>count<\/code>\uff1a\u8981\u6c42\u8bfb\u53d6\u4e00\u6b21\u6570\u636e\u7684\u5b57\u8282\u6570\uff1b\u6ce8\u610f\u8fd4\u56de\u503c\u662f\u5b9e\u9645\u8bfb\u5230\u7684\u5b57\u8282\u6570\uff0c\u4e8c\u8005\u5e76\u4e0d\u76f8\u540c\uff1b<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f\uff1a<\/strong>\u8bfb\u64cd\u4f5c\u4ece\u6587\u4ef6\u7684<strong>\u5f53\u524d\u4f4d\u79fb\u91cf<\/strong>\u5f00\u59cb\uff0c\u5728\u6210\u529f\u8fd4\u56de\u4e4b\u524d\uff0c\u8be5\u4f4d\u79fb\u91cf\u589e\u52a0\u5b9e\u9645\u8bfb\u5f97\u7684\u5b57\u8282\u6570\uff08\u8fd9\u4e2a\u4f4d\u79fb\u91cf\u662f\u53ef\u4ee5\u81ea\u5df1\u8bbe\u7f6e\u7684\uff09\uff1b<\/p>\n<h3>close\uff08\uff09<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446654aab.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe7\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe7\" \/><\/p>\n<p>\u6ce8\u610f\uff1a\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u7ec8\u6b62\u65f6\uff0c\u5b83\u6240\u6253\u5f00\u7684\u6587\u4ef6\u90fd\u7531\u5185\u6838\u81ea\u52a8\u5173\u95ed\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/171266979866154466583c5.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe8\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe8\" \/><\/p>\n<p>\u6ce8\uff1a\u8fd9\u4e9b<strong>\u4e0d\u5e26\u7f13\u5b58<\/strong>\u7684\u51fd\u6570\u90fd\u662f\u5185\u6838\u63d0\u4f9b\u7684\u7cfb\u7edf\u8c03\u7528\uff1b\u8fd9\u6b63\u662f\u548c\u6211\u4eec\u5728C\u8bed\u8a00\u4e2d\u5b66\u5230\u7684\u90a3\u4e9bIO\u64cd\u4f5c\u4e0d\u540c\u7684\u5730\u65b9\uff0c\u4ed6\u4eec\u4e0d\u662f\u6807\u51c6C\u7684\u7ec4\u6210\u90e8\u5206\uff0c\u4f46\u662fPOSIX\u7684\u7ec4\u6210\u90e8\u5206\u3002<\/p>\n<p>\u6807\u51c6C\u5bf9\u6587\u4ef6\u64cd\u4f5c\u65f6\u90fd\u662f\u901a\u8fc7\u5bf9FILE\u7684\u7ed3\u6784\u4f53\u6307\u9488\u8fdb\u884c\u64cd\u4f5c\u7684\uff0c\u800c\u8fd9\u91cc\u4f7f\u7528\u7684\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8303\u56f4\u662f0&amp;mdash;&amp;mdash;OPEN MAX\uff0c\u65e9\u671f\u7684Unix\u91c7\u7528\u7684\u4e0a\u9650\u4e3a19\uff08\u5373\u5141\u8bb8\u6bcf\u4e2a\u8fdb\u7a0b\u6253\u5f0020\u4e2a\u6587\u4ef6\uff09\uff0c\u73b0\u5728\u5f88\u591a\u7cfb\u7edf\u5c06\u5373\u589e\u52a0\u523063\uff0cLinux\u4e3a1024\uff0c\u5177\u4f53\u591a\u5c11\u53ef\u4ee5\u5728&lt;unistd.h&gt;\u7684\u5934\u6587\u4ef6\u4e2d\u67e5\u627e\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446659c2c.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe9\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe9\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544665dccf.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe10\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe10\" \/><\/p>\n<p><strong>\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0e\u6587\u4ef6\u6307\u9488<\/strong><\/p>\n<ul>\n<li>\n<p>FILE *fdopen(int fd,const char *mode)\uff0c\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u8f6c\u4e3a\u6587\u4ef6\u6307\u9488\uff1b<\/p>\n<\/li>\n<li>\n<p>int fileno(FILE *stream)\uff0c\u5c06\u6587\u4ef6\u6307\u9488\u8f6c\u6362\u4e3a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1b<\/p>\n<\/li>\n<\/ul>\n<h3>lseek\u51fd\u6570<\/h3>\n<p><strong>\u529f\u80fd\uff1a<\/strong> \u5b9a\u4f4d\u4e00\u4e2a\u5df2\u6253\u5f00\u7684\u6587\u4ef6<\/p>\n<pre>off_t&nbsp;lseek(int&nbsp;fd,off_t&nbsp;offset,int&nbsp;whence);<\/pre>\n<ul>\n<li>\n<p><code>fd<\/code>\uff1a\u5df2\u7ecf\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1b<\/p>\n<\/li>\n<li>\n<p><code>offset<\/code>\uff1a\u4f4d\u79fb\u91cf\uff1b<\/p>\n<\/li>\n<li>\n<p><code>whence<\/code>\uff1a\u5b9a\u4f4d\u7684\u4f4d\u7f6e\uff0c\u5373\u57fa\u51c6\u70b9<\/p>\n<\/li>\n<li>\n<p><code>SEEK_SET<\/code>\uff1a\u5c06\u8be5\u6587\u4ef6\u7684\u4f4d\u79fb\u91cf\u8bbe\u7f6e\u4e3a\u8ddd\u6587\u4ef6\u5f00\u59cb\u5904offset\u4e2a\u5b57\u8282\uff1b<\/p>\n<\/li>\n<li>\n<p><code>SEEK_CUR<\/code>\uff1a\u5c06\u8be5\u6587\u4ef6\u7684\u4f4d\u79fb\u91cf\u8bbe\u7f6e\u4e3a\u5176\u5f53\u524d\u503c\u52a0offset\uff0coffset\u53ef\u6b63\u53ef\u8d1f\uff1b<\/p>\n<\/li>\n<li>\n<p><code>SEEK_END<\/code>\uff1a\u5c06\u8be5\u6587\u4ef6\u7684\u4f4d\u79fb\u91cf\u8bbe\u7f6e\u4e3a\u6587\u4ef6\u957f\u5ea6\u52a0offset\uff0coffset\u53ef\u6b63\u53ef\u8d1f\uff08\u6b64\u65f6\u82e5\u4e3a\u6b63\u503c\uff0c\u5c31\u6d89\u53ca\u5230\u7a7a\u6d1e\u6587\u4ef6\u4e86\uff0c\u8bf7\u770b\u4e0b\u9762\u7684\u8bb2\u89e3\uff09\uff1b<\/p>\n<\/li>\n<li>\n<p>\u8fd4\u56de\u503c\uff1a**\u82e5\u6210\u529f\u5219\u8fd4\u56de\u65b0\u7684\u6587\u4ef6\u4f4d\u79fb\u91cf\uff08\u7edd\u5bf9\u4f4d\u79fb\u91cf\uff09**\u82e5\u51fa\u9519\u4e3a-1\uff1b\u5b9a\u4f4d\u5230\u6587\u4ef6\u5c3e\u90e8\u65f6\uff0c\u53ef\u4ee5\u8fd4\u56de\u6587\u4ef6\u7684\u5927\u5c0f\uff1b<\/p>\n<\/li>\n<li>\n<p>lseek\u51fd\u6570\u4e5f\u53ef\u4ee5\u7528\u6765\u786e\u5b9a\u6240\u6d89\u53ca\u7684\u6587\u4ef6\u662f\u5426\u53ef\u4ee5\u8bbe\u7f6e\u4f4d\u79fb\u91cf\uff0c\u5982\u679c\u6587\u4ef6\u63cf\u8ff0\u7b26\u6240\u5f15\u7528\u7684\u662f\u4e00\u4e2a\u7ba1\u9053\u6216\u8005FIFO\uff0c\u5219lseek\u8fd4\u56de-1\uff0c\u5e76\u5c06errno\u8bbe\u7f6e\u4e3aEPLPE\uff1b<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u7a7a\u6d1e\u6587\u4ef6\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>#include&lt;stdio.h&gt;\n#include&lt;fcntl.h&gt;\n#include&lt;string.h&gt;\n#include&lt;stdlib.h&gt;\n#include&lt;unistd.h&gt;\n#include&lt;errno.h&gt;\n\n\/\/\u751f\u6210\u7a7a\u6d1e\u6587\u4ef6\nchar&nbsp;*buffer&nbsp;=&nbsp;\"0123456789\";\n\nint&nbsp;main(int&nbsp;argc,char&nbsp;*argv[])\n{\n\tif(argc&nbsp;&lt;&nbsp;2)\n\t{\n\t\tfprintf(stderr,\"-usage:%s&nbsp;[file]\\n\",argv[0]);\n\t\texit(1);\n\t}\n\n\tint&nbsp;fd&nbsp;=&nbsp;open(argv[1],O_WRONLY&nbsp;|&nbsp;O_CREATE&nbsp;|&nbsp;O_TRUNC,0777);\n\tif(fd&nbsp;&lt;&nbsp;0)\n\t{\n\t\tperror(\"open&nbsp;error\");\n\t\texit(1);\n\t}\n\n\tsize_t&nbsp;size&nbsp;=&nbsp;strlen(buffer)&nbsp;*&nbsp;sizeof(char);\n\t\/\/\u5c06\u5b57\u7b26\u4e32\u5199\u5165\u5230\u7a7a\u6d1e\u6587\u4ef6\u4e2d\n\tif(write(fd,buffer,size)&nbsp;!=&nbsp;size)\n\t{\n\t\tperror(\"write&nbsp;error\");\n\t\texit(1);\n\t}\n\t\n\t\/\/\u5b9a\u4f4d\u5230\u6587\u4ef6\u5c3e\u90e8\u768410\u4e2a\u5b57\u8282\u5904\n\tif(lseek(fd,10L;SEERK_END)&nbsp;&lt;&nbsp;0)\n\t{\n\t\tperror(\"lseek&nbsp;error\");\n\t\texit(1);\n\t}\n\t\/\/\u4ece\u6587\u4ef6\u5c3e\u90e8\u768410\u4e2a\u5b57\u8282\u5904\u518d\u5199\u5165\u5b57\u7b26\u4e32\n\tif(write(fd,buffer,size)&nbsp;!=&nbsp;size)\n\t{\n\t\tperror(\"write&nbsp;error\");\n\t\texit(1);\n\t}\n\tclose(fd)\uff1b\n\treturn&nbsp;0;\n}<\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/171266979866154466619e1.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe11\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe11\" \/><\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u7528more\u547d\u4ee4\u67e5\u770b\u6587\u4ef6\u5185\u5bb9\u65f6\uff0c\u53d1\u73b0\u663e\u793a\u7684\u5185\u5bb9\u53ea\u6709\u4e00\u6b21\u5199\u5165\u7684\u7ed3\u679c\uff0c\u7528od<\/p>\n<p>-c\u547d\u4ee4\u67e5\u770b\u6587\u4ef6\u7684ASSCI\u7801\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u5728\u4e24\u6b21\u5185\u5bb9\u4e4b\u95f4\uff0c\u670910\u4e2a\\0\uff0c\u8fd9\u5c31\u662f\u7a7a\u6d1e\uff0c\u7528vim\u6253\u5f00\u8be5\u6587\u4ef6\u5185\u5bb9\u4e5f\u53ef\u4ee5\u770b\u5230\uff0c\u670910\u4e2a^@\u7b26\u3002<\/p>\n<p>\u6ce8\uff1a\u6bcf\u4e2a\u6587\u4ef6\u90fd\u6709\u4e00\u4e2a\u4e0e\u5176\u76f8\u5173\u8054\u7684\u201c\u5f53\u524d\u6587\u4ef6\u504f\u79fb\u91cf\u201d\uff0c\u5b83\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\uff0c\u7528\u4ee5\u5ea6\u91cf\u4ece\u6587\u4ef6\u5f00\u59cb\u5904\u8ba1\u7b97\u7684\u5b57\u8282\u6570\u3002\u901a\u5e38\u8bfb\u5199\u64cd\u4f5c\u90fd\u4ee5\u6587\u4ef6\u5f53\u524d\u504f\u79fb\u91cf\u5904\u5f00\u59cb\uff0c\u5e76\u4f7f\u5f97\u504f\u79fb\u91cf\u589e\u52a0\u6240\u8bfb\u6216\u6240\u5199\u7684\u5b57\u8282\u6570\u3002\u6309\u7cfb\u7edf\u9ed8\u8ba4\uff0c\u5f53\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u65f6\uff0c\u9664\u975e\u6307\u5b9aO_APPEND\u9009\u62e9\u9879\uff0c\u5426\u5219\u8be5\u6587\u4ef6\u4f4d\u79fb\u91cf\u88ab\u8bbe\u7f6e\u4e3a0\uff1b<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446664fe1.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe12\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe12\" \/><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/171266979866154466686dd.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe13\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe13\" \/><\/p>\n<p>fd = 3\u7684\u539f\u56e0\u662f\uff1a<\/p>\n<p>\u7cfb\u7edf\u5185\u90e8PCB\u5b58\u5728\u4e00\u4e2a<strong>\u6587\u4ef6\u8868<\/strong>\uff0c\u4ee5\u8bb0\u5f55\u6253\u5f00\u7684\u6587\u4ef6\uff0c\u6587\u4ef6\u63cf\u8ff0\u7b26\u5176\u5b9e\u5c31\u662f\u6587\u4ef6\u8868\u7684\u4e0b\u6807<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544666b133.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe14\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe14\" \/><\/p>\n<ul>\n<li>\n<p>0&amp;mdash;&amp;mdash;FILE* stdin\uff0c\u6807\u51c6\u8f93\u5165<\/p>\n<\/li>\n<li>\n<p>1&amp;mdash;&amp;mdash;FILE* stdout\uff0c\u6807\u51c6\u8f93\u51fa<\/p>\n<\/li>\n<li>\n<p>3&amp;mdash;&amp;mdash;FILE* stderr\uff0c\u6807\u51c6\u9519\u8bef\u8f93\u51fa<\/p>\n<\/li>\n<li>\n<p>\u672c\u7a0b\u5e8f\u5df2\u7ecf\u9ed8\u8ba4\u6253\u5f00\u4e86\u4e09\u4e2a\u6587\u4ef6\uff0cfd\u6392\u5230\u7b2c\u56db\u4e2a\uff0c\u6240\u4ee5\u7f16\u53f7\u4e3a3<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u63a5\u4e0b\u6765\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544666efce.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe15\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe15\" \/><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/171266979866154466721bd.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe16\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe16\" \/><\/p>\n<h3>\u5e94\u7528\uff1a\u5229\u7528\u8bfb\u5199\u5bf9\u6587\u4ef6\u8fdb\u884c\u590d\u5236<\/h3>\n<p>\u9996\u5148\u58f0\u660e\uff1a\u6211\u4eec\u4e0d\u533a\u5206\u6587\u672c\u6587\u4ef6\u8fd8\u662f\u4e8c\u8fdb\u5236\u6587\u4ef6<\/p>\n<p>\u5b8c\u6210\u5bf9\u4e00\u4e2a\u56fe\u7247\u7684\u590d\u5236\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u7684\u65b9\u6848\uff1a<\/p>\n<ul>\n<li>\n<p>\u5148\u6253\u5f00\u539f\u6765\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6<\/p>\n<\/li>\n<li>\n<p>\u6253\u5f00\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/p>\n<\/li>\n<li>\n<p>\u4ece\u539f\u6765\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\u4e2d\u8bfb\u53d6\u4e00\u90e8\u5206\u5199\u5165\u65b0\u6587\u4ef6<\/p>\n<\/li>\n<li>\n<p>\u53cd\u590d\u8bfb\u5199<\/p>\n<\/li>\n<li>\n<p>\u76f4\u5230\u8bfb\u5b8c\uff0c\u5199\u5b8c\u5c31\u505c\u6b62\u3010read() == 0\u4f5c\u4e3a\u5faa\u73af\u505c\u6b62\u7684\u6761\u4ef6\uff0c\u8bfb\u4e0d\u5230\u5c31\u662f\u8bfb\u5b8c\u4e86\u3011<\/p>\n<\/li>\n<li>\n<p>\u5b8c\u6210\u590d\u5236<\/p>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446675c7a.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe17\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe17\" \/><\/p>\n<p>\u590d\u5236\u5b8c\u6210<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446679667.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe18\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe18\" \/><\/p>\n<h3>\u6253\u5f00\u6587\u4ef6\u540e\uff0cfork\u7684\u5b50\u8fdb\u7a0b\u80fd\u5426\u5171\u4eab\u548c\u7236\u8fdb\u7a0b\u5171\u4eab\u8bbf\u95ee\u540c\u4e00\u4e2a\u6587\u4ef6\uff1f<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544667e134.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe19\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe19\" \/><\/p>\n<p>\u6211\u4eec\u6bcf\u6b21\u6253\u5f00\u6587\u4ef6\u4ee5\u540e\uff0c\u4f1a\u5728\u5185\u6838\u4e2d\u4ea7\u751fstruct file\u8fd9\u6837\u4e00\u4e2a\u7ed3\u6784\u4f53\uff0c\u4ee5\u8868\u793a\u6253\u5f00\u7684\u6587\u4ef6\uff0c\u8bb0\u5f55\u7740\u4ee5\u4e0b\u4fe1\u606f\uff1a<\/p>\n<ul>\n<li>\n<p>\u6587\u4ef6\u504f\u79fb\u91cf\uff08\u8d77\u59cb\u4ece0\u5f00\u59cb\uff0c\u6587\u4ef6\u6307\u9488\u968f\u7740\u5199\u5165\u6570\u636e\u8fdb\u884c\u504f\u79fb\uff09<\/p>\n<\/li>\n<li>\n<p>\u5f15\u7528\u8ba1\u6570\uff08\u51e0\u4e2a\u8fdb\u7a0b\u6b63\u5728\u4f7f\u7528\u8fd9\u4e2a\u6253\u5f00\u7684\u6587\u4ef6\uff09<\/p>\n<\/li>\n<li>\n<p>inode\u8282\u70b9\uff08\u5b58\u653e\u8fdb\u7a0b\u7684\u5c5e\u6027\u4fe1\u606f\uff1a\u8c01\u521b\u5efa\u4e86\uff0c\u540d\u5b57\u662f\u4ec0\u4e48\uff0c\u5728\u78c1\u76d8\u54ea\u91cc\u5b58\u50a8\u3002\u901a\u8fc7\u8fd9\u4e2ainode\u8282\u70b9\uff0c\u6211\u4eec\u624d\u80fd\u627e\u5230\u5bf9\u5e94\u7684\u8fd9\u4e2a\u5177\u4f53\u7684\u6587\u4ef6\uff09<\/p>\n<\/li>\n<li>\n<p>\u6253\u5f00\u65b9\u5f0f\uff1a\u6bd4\u5982\u53ea\u8bfb\u65b9\u5f0f\uff0c\u53ea\u5199\u65b9\u5f0f\u6253\u5f00<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u6d4b\u8bd51\uff1a\u5148\u6253\u5f00\u6587\u4ef6\u518dfork<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/171266979866154466817aa.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe20\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe20\" \/><\/p>\n<p>close\uff08fd\uff09\u5199\u5728\u6700\u5916\u4fa7\uff0c\u7236\u5b50\u8fdb\u7a0b\u90fd\u4f1a\u5173\u95ed\uff0c\u6bcf\u5173\u95ed\u4e00\u6b21\uff0c\u5f15\u7528\u8ba1\u6570\u51cf1\uff0c\u76f4\u5230\u4e3a0\u3002<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/17126697986615446684e99.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe21\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe21\" \/><\/p>\n<p>\u539f\u56e0\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/171266979866154466879c3.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe22\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe22\" \/><\/p>\n<p><strong>\u6d4b\u8bd52\uff1a\u5148fork\u518d\u6253\u5f00\u6587\u4ef6<\/strong><\/p>\n<p>\u4fee\u6539\u4ee3\u7801\u540e\uff0c\u8fd0\u884c\u7ed3\u679c\u53d1\u751f\u5982\u4e0b\u53d8\u5316\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240409\/1712669798661544668b5e3.png\" class=\"aligncenter\" title=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe23\" alt=\"Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u63d2\u56fe23\" \/><\/p>\n<p>\u56e0\u4e3a\u7236\u5b50\u8fdb\u7a0b\u5206\u79bb\u540e\uff0c\u6253\u5f00\u4e86\u5404\u81ea\u7684\u6587\u4ef6\uff0c\u4ea7\u751f\u4e86\u5404\u81ea\u7684struct file\uff0c\u4e0d\u518d\u5171\u4eab\u6587\u4ef6\u504f\u79fb\u91cf\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u7684\u5e94\u7528\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u66f4\u591a\u5730\u4f7f\u7528\u7236\u8fdb\u7a0b\u6253\u5f00\u7684\u6587\u4ef6\uff0c\u5b50\u8fdb\u7a0b\u53bb\u8bbf\u95ee\u8fd9\u79cd\u5f62\u5f0f\u3002<\/p>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528 \u5728IT\u884c\u4e1a\u8fd9\u4e2a\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u5f88\u5feb\u7684\u884c\u4e1a\uff0c\u53ea\u6709\u4e0d\u505c\u6b62\u7684\u5b66\u4e60\uff0c\u624d\u4e0d\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u5982\u679c\u4f60\u662f\u6587\u7ae0\u5b66\u4e60\u8005\uff0c\u90a3\u4e48\u672c\u6587\u300aLinux\u64cd\u4f5c\u6587\u4ef6\u7684\u5e95\u5c42\u7cfb\u7edf\u600e\u4e48\u8c03\u7528\u300b\u5c31\u5f88\u9002\u5408\u4f60\uff01\u672c\u7bc7\u5185\u5bb9\u4e3b\u8981\u5305\u62ec##content_title##\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01 linux\u64cd\u4f5c\u7cfb\u7edf\u5949\u884c\u4e00\u5207\u7686\u6587\u4ef6\u7684\u7406\u5ff5\uff0c\u6240\u6709\u6587\u4ef6\u8bbe\u5907\u51e0\u4e4e\u90fd\u53ef\u4ee5\u7528\u4e00\u5957\u7cfb\u7edf\u8c03\u7528\u5373open()\/close()\/write()\/read()\u7b49\u6765\u64cd\u4f5c\u3002\u7cfb\u7edf\u8c03\u7528\u548cC\u5e93\u8c03\u7528\u64cd\u4f5c\u6587\u4ef6\u7c7b\u4f3c\u3002Linux\u81ea\u5e26\u7684man\u624b\u518c\u662f\u6700\u6743\u5a01\u7684\u3002\u901a\u8fc7\u67e5\u770bman\u624b\u518c\u6765\u67e5\u770b\u7cfb\u7edf\u8c03\u7528\u7528\u6cd5\u3002 \u4ee3\u53f7 &amp;mdash;&amp;mdash; \u4ee3\u8868\u7684\u542b\u4e49 1 &amp;mdash;&amp;mdash; \u7528\u6237\u5728shell\u73af\u5883\u4e0b\u53ef\u64cd\u4f5c\/\u53ef\u6267\u884c\u7684\u547d\u4ee4 2 &amp;mdash;&amp;mdash; \u7cfb\u7edf\u5185\u6838\u53ef\u8c03\u7528\u7684\u51fd\u6570\u4e0e\u5de5\u5177 3 &amp;mdash;&amp;mdash; \u4e00\u4e9b\u5e38\u7528\u7684\u51fd\u6570\u4e0e\u51fd\u6570\u5e93\uff0c\u5927\u90e8\u5206C\u7684\u51fd\u6570\u5e93 4 &amp;mdash;&amp;mdash; \u8bbe\u5907\u6587\u4ef6\u7684\u8bf4\u660e\uff0c\u901a\u5e38\u662f\u5728 \/dev\u4e0b\u7684\u8bbe\u5907 5 &amp;mdash;&amp;mdash; \u914d\u7f6e\u6587\u4ef6\u6216\u67d0\u4e9b\u6587\u4ef6\u7684\u683c\u5f0f 6 &amp;mdash;&amp;mdash; \u6e38\u620f 7 &amp;mdash;&amp;mdash; \u7ba1\u7406\u4e0e\u534f\u8bae\u7b49\uff0c\u4f8b\u5982Linux\u6587\u4ef6\u7cfb\u7edf\u3001\u7f51\u7edc\u534f\u8bae\u7b49 8 &amp;mdash;&amp;mdash; \u7cfb\u7edf\u7ba1\u7406\u5458\u53ef\u7528\u7684\u547d\u4ee4 9 &amp;mdash;&amp;mdash; \u4e0eKernel\u6709\u5173\u7684\u6587\u4ef6 \u6ce8\u610f\uff0c\u7cfb\u7edf\u7684\u5934\u6587\u4ef6\u5728Linux\u4e2d\u4e00\u822c\u5b58\u653e\u5728\/usr\/include\u76ee\u5f55\u4e0b\uff1b\u4e0b\u9762\u5305\u542b\u7684\u4e00\u4e9b\u5934\u6587\u4ef6\u6709\u7684\u5e26\u4e86sys\uff0c\u5176\u5b9e\u662finclude\u5e95\u4e0b\u7684\u5b50\u76ee\u5f55\u4e2d\u7684\u5934\u6587\u4ef6 open\uff08\uff09&amp;mdash;&amp;mdash;\u6253\u5f00\u6216\u8005\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6 \u8fd4\u56de\u503c\u7c7b\u578b\uff1a int&amp;mdash;&amp;mdash;\u6587\u4ef6\u63cf\u8ff0\u7b26fd\uff0c\u6bcf\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\uff0c\u5c31\u4f1a\u5f97\u5230\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u6574\u5f62\u7684\uff0c\u6211\u4eec\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u3002 \u5931\u8d25\uff1a-1 \u6210\u529f\uff1a&gt;= 0\uff0c\u5373\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1b mode_t\u662f\u4e00\u4e2a\u7c7b\u578b\u522b\u540d\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u4e00\u4e2a\u6709\u7b26\u53f7\u7684\u6574\u6570\uff0c\u5bf9open\u51fd\u6570\u800c\u8a00\uff0c\u4ec5\u4ec5\u5f53\u521b\u5efa\u65b0\u6587\u4ef6\u65f6\u624d\u4f7f\u7528\u7b2c\u4e09\u4e2a\u53c2\u6570 flag\uff1a\u6253\u5f00\u6807\u5fd7 \u6ce8\u610f\uff1a \u8fd9\u4e9b\u5176\u5b9e\u90fd\u662f\u5b9a\u4e49\u7684\u4e00\u4e9b\u5b8f\uff0c\u5f53\u9700\u8981\u4f7f\u7528\u5230\u591a\u4e2a\u53c2\u6570\u65f6\uff0c\u4f7f\u7528\u6309\u4f4d\u6216\u201c | \u201d\u6784\u6210\u591a\u4e2aflag\u53c2\u6570 \u4e5f\u53ef\u8ddf\u968f\u4e0b\u9762\u7684\u65b9\u5f0f\u4e00\u8d77\u4f7f\u7528\uff1a \u5176\u4ed6\u4e0d\u4e00\u4e00\u4ecb\u7ecd\uff0c\u9700\u8981\u4f7f\u7528\u65f6\u81ea\u67e5\u3002 write\uff08\uff09 \u8fd4\u56de\u503c\uff1a \u82e5\u6210\u529f\u4e3a\u5df2\u7ecf\u5199\u5165\u7684\u5b57\u8282\u6570\uff1b \u82e5\u51fa\u9519\u4e3a-1\uff1b \u6ce8\u610f\uff1a\u8ba1\u5212\u5199\u5165\u7684\u5b57\u8282\u6570\u548c\u51fd\u6570\u7684\u8fd4\u56de\u503c\u4e0d\u76f8\u7b49\u65f6\uff0c\u8868\u793a\u5199\u5165\u51fa\u73b0\u4e86\u9519\u8bef\uff0c\u53ef\u4ee5\u7528\u6765\u68c0\u9a8c\u5199\u5165\u662f\u5426\u6210\u529f\uff1b \u53c2\u6570\uff1a 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