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\u7cfb\u7edf&#xff0c;\u90a3\u65f6\u5019\u6709\u4e00\u79cd\u6bd4\u8f83\u5e38\u89c1\u7684\u5916\u90e8\u8bbe\u5907\u662f\u7535\u4f20\u6253\u5b57\u673a&#xff0c;\u5176\u5b9e\u5c31\u662f\u4e00\u4e2a\u952e\u76d8\u548c\u6253\u5370\u673a\u7ec4\u5408\u8d77\u6765\u7684\u7ec8\u7aef\u8bbe\u5907&#xff0c;\u7528\u6237\u6572\u952e\u76d8\u65f6&#xff0c;\u8bbe\u5907\u4e00\u6b21\u53d1\u9001\u4e00\u4e2a\u5b57\u7b26\u5230\u8ba1\u7b97\u673a&#xff0c;\u8ba1\u7b97\u673a\u8f93\u51fa\u65f6\u4e5f\u662f\u4e00\u4e2a\u5b57\u7b26\u4e00\u4e2a\u5b57\u7b26\u6253\u5370\u51fa\u6765\u3002\u8fd9\u79cd\u8bbe\u5907\u5929\u7136\u5c31\u662f\u9010\u5b57\u7b26\u5904\u7406\u7684&#xff0c;\u6ca1\u6709\u968f\u673a\u8bbf\u95ee\u7684\u9700\u6c42\u3002\u5728 Unix \u8bbe\u8ba1\u4e2d&#xff0c;\u8fd9\u7c7b\u8bbe\u5907\u7edf\u4e00\u79f0\u4e3a character devices&#xff08;\u5b57\u7b26\u8bbe\u5907&#xff09;&#xff0c;\u4ee5\u533a\u522b\u4e8e\u53e6\u4e00\u79cd\u7c7b\u4f3c\u4e8e\u78c1\u5e26&#xff0c;\u78c1\u76d8\u7684\u8bbe\u5907&#xff0c;\u8fd9\u4e9b\u8bbe\u5907\u6bcf\u6b21\u8bfb\u5199\u56fa\u5b9a\u5927\u5c0f\u7684\u5757\u3002\u6240\u4ee5&#xff0c;\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a&#xff0c;\u6211\u4eec\u53ef\u4ee5\u8ba4\u4e3a\u201c\u5b57\u7b26\u201d\u8fd9\u4e2a\u8bcd\u76f4\u63a5\u6765\u6e90\u4e8e\u65e9\u671f\u6700\u5178\u578b\u7684\u5b57\u7b26\u7ec8\u7aef\u7684\u5de5\u4f5c\u65b9\u5f0f&#xff1a;\u6309\u5b57\u7b26\u6d41\u4f20\u8f93\u6570\u636e\u3002<\/p>\n<p>\u8bbe\u8ba1\u7406\u5ff5&#xff1a;Linux \u7ee7\u627f\u4e86 Unix \u7684\u8bbe\u5907\u6a21\u578b&#xff0c;\u628a\u8bbe\u5907\u62bd\u8c61\u6210\u6587\u4ef6&#xff0c;\u4f46\u5728\u4e0d\u540c\u8bbe\u5907\u7c7b\u578b\u7684\u8bbf\u95ee\u65b9\u5f0f\u4e0a\u6709\u672c\u8d28\u7684\u533a\u522b\u3002\u5b57\u7b26\u8bbe\u5907\u7684\u6838\u5fc3\u7406\u5ff5\u662f\u63d0\u4f9b\u4e00\u4e2a\u65e0\u7ed3\u6784\u7684&#xff0c;\u8fde\u7eed\u7684\u5b57\u8282\u6d41\u63a5\u53e3&#xff0c;\u5c31\u50cf\u6c34\u7ba1\u91cc\u6d41\u51fa\u7684\u6c34\u4e00\u6837&#xff0c;\u6211\u4eec\u53ea\u7ba1\u8bfb\u5199\u5b57\u8282&#xff0c;\u4e0d\u5173\u5fc3\u5757\u6216\u7ed3\u6784\u3002\u800c\u5757\u8bbe\u5907\u6709\u56fa\u5b9a\u5927\u5c0f\u7684\u5757&#xff0c;\u652f\u6301\u968f\u673a\u8bbf\u95ee&#xff0c;\u5e76\u4e14\u6709\u5185\u6838\u7f13\u51b2\u3002\u5728\u65e9\u671f\u7684 ASCII \u7f16\u7801\u65f6\u4ee3&#xff0c;\u4e00\u4e2a\u5b57\u7b26\u5c31\u662f\u4e00\u4e2a\u5b57\u8282&#xff0c;\u5b57\u7b26\u6d41\u4e5f\u5c31\u7b49\u4e8e\u5b57\u8282\u6d41\u3002\u4f46\u662f\u5b57\u7b26\u8fd9\u4e2a\u8bcd\u66f4\u80fd\u4f53\u73b0\u9762\u5411\u6587\u672c\u7684\u542b\u4e49&#xff0c;\u6240\u4ee5\u5373\u4f7f\u540e\u6765\u51fa\u73b0\u4e86 Unicode\u3001\u591a\u5b57\u8282\u7f16\u7801&#xff0c;\u8fd8\u662f\u5ef6\u7eed\u4e86\u5b57\u7b26\u8bbe\u5907\u7684\u53eb\u6cd5\u3002<\/p>\n<p>\u73b0\u5728&#xff0c;\u6211\u4eec\u5199\u4e00\u4e2a\u63a7\u5236 LED \u6216\u8005\u8bfb\u53d6\u4f20\u611f\u5668\u6570\u636e\u7684\u9a71\u52a8&#xff0c;\u4ed6\u4e5f\u53eb\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8&#xff0c;\u56e0\u4e3a\u5b83\u7b26\u5408\u540c\u6837\u7684\u62bd\u8c61\u6a21\u578b&#xff0c;\u5373\u7528\u6237\u7a7a\u95f4\u901a\u8fc7 read \u6216write\u6216 ioctl \u64cd\u4f5c\u4e00\u4e2a\u6d41\u3002<\/p>\n<p>\u7406\u89e3\u4e86\u8fd9\u4e2a\u540d\u5b57\u7684\u6765\u9f99\u53bb\u8109&#xff0c;\u5f53\u4f60\u518d\u770b\u5b57\u7b26\u8bbe\u5907\u4ee3\u7801\u65f6\u5c31\u4f1a\u66f4\u6709\u611f\u89c9\u3002\u5b83\u5e76\u4e0d\u662f\u968f\u610f\u8d77\u7684\u540d\u5b57&#xff0c;\u800c\u662f\u53e4\u4eba\u667a\u6167\u7684\u7ed3\u6676&#xff0c;\u627f\u8f7d\u7740\u8bbe\u5907\u6a21\u578b\u7684\u6838\u5fc3\u7406\u5ff5\u3002<\/p>\n<h3>1.2 \u5b57\u7b26\u8bbe\u5907\u5728 Linux \u4e2d\u7684\u4f53\u73b0<\/h3>\n<p>\u4e0b\u9762\u6211\u4eec\u770b\u770b\u5b57\u7b26\u8bbe\u5907\u5728\u5b9e\u9645\u7684 Linux \u7cfb\u7edf\u4e2d\u662f\u5982\u4f55\u5448\u73b0\u7684&#xff0c;\u8fd9\u6709\u52a9\u4e8e\u6211\u4eec\u5728\u7528\u6237\u7a7a\u95f4\u5feb\u901f\u8bc6\u522b\u548c\u64cd\u4f5c\u5b57\u7b26\u8bbe\u5907\u3002<\/p>\n<p>Linux \u5c06\u51e0\u4e4e\u6240\u6709\u8bbe\u5907\u90fd\u62bd\u8c61\u4e3a\u6587\u4ef6&#xff0c;\u8fd9\u4e9b\u6587\u4ef6\u901a\u5e38\u4f4d\u4e8e \/dev \u76ee\u5f55\u4e0b&#xff0c;\u6211\u4eec\u53ef\u4ee5\u7528 ls \u547d\u4ee4\u67e5\u770b&#xff0c;\u6211\u622a\u53d6\u4e86\u4e00\u90e8\u5206\u8f93\u51fa\u5185\u5bb9\u5982\u4e0b&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260210074917-698ae2fd30938.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff0c;\u6700\u524d\u9762\u5b57\u6bcd\u4e3ac&#xff0c;\u5c31\u4ee3\u8868\u8fd9\u662f\u4e00\u4e2a\u5b57\u7b26\u8bbe\u5907\u3002\u82e5\u6700\u524d\u9762\u5b57\u6bcd\u4e3ab&#xff0c;\u5219\u4ee3\u8868\u8fd9\u662f\u4e00\u4e2a\u5757\u8bbe\u5907\u3002<\/p>\n<p>\u6b64\u5916&#xff0c;\u6bcf\u4e2a\u8bbe\u5907\u6587\u4ef6\u90fd\u6709\u4e00\u4e2a\u4e3b\u8bbe\u5907\u53f7\u548c\u4e00\u4e2a\u6b21\u8bbe\u5907\u53f7\u3002\u4e3b\u8bbe\u5907\u53f7\u6807\u8bc6\u9a71\u52a8\u7c7b\u578b&#xff0c;\u6b21\u8bbe\u5907\u53f7\u6807\u8bc6\u5177\u4f53\u7684\u8bbe\u5907\u5b9e\u4f8b\u3002<\/p>\n<p>\u4e0a\u56fe\u4e2d\u7b2c\u4e00\u4e2a\u5b57\u7b26\u8bbe\u5907autofs&#xff0c;\u4e3b\u8bbe\u5907\u53f7\u4e3a 10&#xff0c;\u6b21\u8bbe\u5907\u53f7\u4e3a 235\u3002<\/p>\n<p>\u4e0a\u9762\u7684\u622a\u56fe\u4e2d\u53ea\u6709\u90e8\u5206\u7684\u5b57\u7b26\u8bbe\u5907&#xff0c;\u4e0b\u9762\u6211\u518d\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e9b\u6bd4\u8f83\u5e38\u89c1\u7684\u5b57\u7b26\u8bbe\u5907&#xff1a;<\/p>\n<li>\/dev\/ttyS*&#xff1a;\u8fd9\u79cd\u662f\u4e32\u53e3\u8bbe\u5907&#xff0c;\u7528\u4e8e\u4e32\u53e3\u8c03\u8bd5\u3002<\/li>\n<li>\/dev\/tty*&#xff1a;\u8fd9\u662f\u7ec8\u7aef\u8bbe\u5907&#xff0c;\u7528\u4e8e\u63a7\u5236\u53f0\u7684\u8f93\u5165\u8f93\u51fa\u3002<\/li>\n<li>\/dev\/null&#xff1a;\u8fd9\u662f\u7a7a\u8bbe\u5907&#xff0c;\u8bfb\u53d6\u4f1a\u8fd4\u56deEOF&#xff0c;\u5e38\u7528\u4e8e\u5c06\u65e0\u7528\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u7a7a\u8bbe\u5907\u3002<\/li>\n<li>\/dev\/zero&#xff1a;\u8bfb\u53d6\u8be5\u8bbe\u5907\u4f1a\u8fd4\u56de\u5168 0 \u5b57\u8282\u3002<\/li>\n<li>\/dev\/input\/*&#xff1a;\u8f93\u5165\u8bbe\u5907&#xff0c;\u6bd4\u5982\u9f20\u6807\u952e\u76d8&#xff0c;\u89e6\u6478\u5c4f\u7b49\u3002<\/li>\n<p>\u8fd9\u4e9b\u90fd\u662f\u5178\u578b\u7684\u5b57\u7b26\u8bbe\u5907&#xff0c;\u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f\u901a\u8fc7 open\/read\/write\/close \u64cd\u4f5c\u5b83\u4eec&#xff0c;\u5c31\u50cf\u64cd\u4f5c\u666e\u901a\u6587\u4ef6\u4e00\u6837\u3002<\/p>\n<h3>1.3 \u4e09\u5927\u8bbe\u5907\u7b80\u5355\u5bf9\u6bd4<\/h3>\n<p>\u4e3a\u4e86\u80fd\u66f4\u597d\u5730\u533a\u5206\u5b57\u7b26\u8bbe\u5907\u4e0e\u5176\u4ed6\u4e24\u79cd\u8bbe\u5907&#xff0c;\u672c\u5c0f\u7ed3\u6211\u4eec\u7b80\u5355\u5bf9\u6bd4\u4e00\u4e0b\u8fd9\u4e09\u8005\u7684\u7279\u70b9\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260210074917-698ae2fd6f06b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>2. \u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u7684\u62bd\u8c61\u6a21\u578b\u4e0e\u6838\u5fc3\u7ed3\u6784\u4f53<\/h2>\n<p>\u5728\u7b2c\u4e00\u7ae0\u4e2d&#xff0c;\u6211\u4eec\u770b\u5230\u4e86\u5b57\u7b26\u8bbe\u5907\u5728\u7528\u6237\u7a7a\u95f4\u7684\u8868\u73b0\u5f62\u5f0f&#xff0c;\u4ed6\u4eec\u662f\u4e00\u4e2a\u4e2a\u4f4d\u4e8e \/dev \u4e0b\u7684\u7279\u6b8a\u6587\u4ef6\u3002\u7528\u6237\u7a0b\u5e8f\u901a\u8fc7\u719f\u6089\u7684 open()\u3001read()\u3001write()\u3001close() \u7cfb\u7edf\u8c03\u7528\u64cd\u4f5c\u5b83\u4eec&#xff0c;\u5c31\u597d\u50cf\u5728\u64cd\u4f5c\u666e\u901a\u6587\u4ef6\u4e00\u6837\u3002<\/p>\n<p>\u4f46\u8fd9\u4e9b\u64cd\u4f5c\u6700\u7ec8\u662f\u5982\u4f55\u843d\u5b9e\u5230\u771f\u5b9e\u786c\u4ef6\u4e0a\u7684\u5462&#xff1f;\u8fd9\u5c31\u6d89\u53ca Linux \u5185\u6838\u5bf9\u8bbe\u5907\u9a71\u52a8\u7684\u62bd\u8c61\u6a21\u578b\u3002\u7406\u89e3\u8fd9\u4e2a\u62bd\u8c61\u6a21\u578b&#xff0c;\u662f\u5199\u597d\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u7684\u5173\u952e&#xff0c;\u4e5f\u662f\u6211\u4eec\u771f\u6b63\u7406\u89e3\u8fd9\u4e2a\u6846\u67b6\u7684\u5173\u952e\u3002<\/p>\n<h3>2.1 \u5b57\u7b26\u8bbe\u5907\u7684\u62bd\u8c61<\/h3>\n<p>Linux \u5185\u6838\u867d\u7136\u7528\u7eaf C \u8bed\u8a00\u7f16\u5199&#xff0c;\u4f46\u8bbe\u5907\u9a71\u52a8\u7684\u8bbe\u8ba1\u5374\u5145\u6ee1\u4e86\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b&#xff08;OOP&#xff09;\u7684\u5473\u9053\u3002\u6211\u4eec\u53ef\u4ee5\u628a\u4e00\u4e2a\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u60f3\u8c61\u6210\u4e00\u4e2a\u7c7b&#xff0c;\u8bbe\u5907\u672c\u8eab\u5c31\u50cf\u4e00\u4e2a\u7c7b&#xff0c;\u6bd4\u5982 LED \u9a71\u52a8\u7c7b\u6216\u8005\u67d0\u79cd\u4f20\u611f\u5668\u9a71\u52a8\u7c7b&#xff0c;\u800c\u6bcf\u4e2a\u6253\u5f00\u7684\u8bbe\u5907\u6587\u4ef6\u5c31\u50cf\u8fd9\u4e2a\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b&#xff0c;\u7528\u6237\u7a7a\u95f4\u7684 read\/write\/ioctl \u8c03\u7528\u5c31\u50cf\u8c03\u7528\u8fd9\u4e2a\u5b9e\u4f8b\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u5185\u6838\u901a\u8fc7\u7ed3\u6784\u4f53\u548c\u51fd\u6570\u6307\u9488\u7684\u65b9\u5f0f&#xff0c;\u5de7\u5999\u7684\u5728 C \u8bed\u8a00\u4e2d\u5b9e\u73b0\u4e86\u7c7b\u4f3c\u9762\u5411\u5bf9\u8c61\u7684\u591a\u6001&#xff0c;\u5c01\u88c5\u548c\u7ee7\u627f\u3002\u6bd4\u5982\u540c\u4e00\u4e2a file_operations \u7ed3\u6784\u4f53\u53ef\u4ee5\u88ab\u591a\u4e2a\u4e0d\u540c\u8bbe\u5907\u5171\u4eab&#xff0c;\u4e0d\u540c\u8bbe\u5907\u7684\u5b9e\u4f8b\u53ef\u4ee5\u901a\u8fc7 private_data \u643a\u5e26\u81ea\u5df1\u4e13\u5c5e\u7684\u72b6\u6001&#xff0c;\u51fd\u6570\u6307\u9488\u8868\u4f7f\u4e0d\u540c\u8bbe\u5907\u53ef\u4ee5\u5b9e\u73b0\u4e0d\u540c\u7684 read\/write \u884c\u4e3a\u3002<\/p>\n<p>\u5728 Linux \u5185\u6838\u4e2d&#xff0c;\u5b57\u7b26\u8bbe\u5907\u88ab\u62bd\u8c61\u4e3a\u4e00\u4e2a\u5177\u4f53\u7684\u6570\u636e\u7ed3\u6784struct cdev&#xff0c;\u53ef\u4ee5\u628a\u5b83\u770b\u4f5c\u5b57\u7b26\u8bbe\u5907\u5bf9\u8c61&#xff0c;cdev \u8bb0\u5f55\u4e86\u5b57\u7b26\u8bbe\u5907\u7684\u76f8\u5173\u4fe1\u606f&#xff0c;\u6bd4\u5982\u8bbe\u5907\u53f7\u7b49\u3002file_operations \u8bb0\u5f55\u4e86\u5b57\u7b26\u8bbe\u5907\u7684\u6253\u5f00&#xff0c;\u8bfb\u5199&#xff0c;\u5173\u95ed\u7b49\u64cd\u4f5c\u63a5\u53e3\u3002\u5f53\u6211\u4eec\u60f3\u6dfb\u52a0\u4e00\u4e2a\u5b57\u7b26\u8bbe\u5907\u65f6&#xff0c;\u5c31\u8981\u5c06\u8fd9\u4e2a\u5bf9\u8c61\u6ce8\u518c\u5230\u5185\u6838\u4e2d&#xff0c;\u901a\u8fc7\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6 (\u7b2c\u4e00\u5f20\u622a\u56fe\u4e2d\u7684\u8bbe\u5907\u8282\u70b9) \u7ed1\u5b9a\u5bf9\u8c61\u7684 cdev&#xff0c;\u5f53\u6211\u4eec\u5bf9\u8fd9\u4e2a\u6587\u4ef6\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u65f6&#xff0c;\u5c31\u53ef\u4ee5\u901a\u8fc7\u865a\u62df\u6587\u4ef6\u7cfb\u7edf&#xff0c;\u5728\u5185\u6838\u4e2d\u627e\u5230\u8fd9\u4e2a\u5bf9\u8c61\u53ca\u5176\u64cd\u4f5c\u63a5\u53e3&#xff0c;\u4ece\u800c\u80fd\u63a7\u5236\u5b9e\u5b9e\u5728\u5728\u7684\u8bbe\u5907\u3002<\/p>\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u8ba9\u9a71\u52a8\u6846\u67b6\u9ad8\u5ea6\u6a21\u5757\u5316\u3002\u5185\u6838\u53ea\u5173\u5fc3\u63a5\u53e3&#xff0c;\u4e0d\u5173\u5fc3\u5177\u4f53\u7684\u5b9e\u73b0\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u7684\u4ee3\u7801\u770b\u8d77\u6765\u90a3\u4e48\u89c4\u6574&#xff0c;\u5b83\u672c\u8d28\u4e0a\u662f\u5728 C \u8bed\u8a00\u4e2d\u6a21\u62df OOP \u3002<\/p>\n<h3>2.2 \u4e00\u4e9b\u6982\u5ff5\u53ca\u91cd\u8981\u7ed3\u6784\u4f53<\/h3>\n<p>\u524d\u9762\u7b80\u5355\u63d0\u5230\u8fc7&#xff0c;Linux \u4f7f\u7528\u8bbe\u5907\u7f16\u53f7\u6765\u8868\u793a\u8bbe\u5907&#xff0c;\u4e3b\u8bbe\u5907\u53f7\u7528\u6765\u533a\u5206\u8bbe\u5907\u7c7b\u522b&#xff0c;\u6b21\u8bbe\u5907\u53f7\u6807\u8bc6\u5177\u4f53\u7684\u8bbe\u5907\u3002\u5185\u6838\u4f7f\u7528 cdev \u7ed3\u6784\u4f53\u6765\u8bb0\u5f55\u8bbe\u5907\u53f7&#xff0c;\u5728\u4f7f\u7528\u8bbe\u5907\u65f6&#xff0c;\u6211\u4eec\u6253\u5f00\u8bbe\u5907\u8282\u70b9\u5bf9\u5e94\u7684\u6587\u4ef6&#xff0c;\u901a\u8fc7\u8be5\u6587\u4ef6\u7684inode\u7ed3\u6784\u4f53&#xff0c;file \u7ed3\u6784\u4f53\u53ef\u4ee5\u627e\u5230 file_operations \u7ed3\u6784\u4f53&#xff0c;\u5e76\u4e14\u4ece\u4e2d\u83b7\u5f97\u64cd\u4f5c\u8bbe\u5907\u7684\u5177\u4f53\u65b9\u6cd5\u3002<\/p>\n<p>dev_t\u662f\u4e00\u4e2a 32 \u4f4d\u7684\u6570&#xff0c;\u7528\u6765\u8868\u793a\u8bbe\u5907\u7f16\u53f7&#xff0c;\u9ad8 12 \u4f4d\u8868\u793a\u4e3b\u8bbe\u5907\u53f7&#xff0c;\u4f4e 20 \u4f4d\u8868\u793a\u6b21\u8bbe\u5907\u53f7\u3002<\/p>\n<p>\u5728 Linux \u4e2d&#xff0c;\u6240\u6709\u7684\u8bbe\u5907\u8bbf\u95ee\u90fd\u662f\u901a\u8fc7\u6587\u4ef6\u7684\u65b9\u5f0f\u8fdb\u884c\u7684&#xff0c;\u4e00\u822c\u7684\u5b58\u653e\u6570\u636e\u7684\u6587\u4ef6\u6210\u4e3a\u666e\u901a\u6587\u4ef6&#xff0c;\u800c\u8bbe\u5907\u8282\u70b9\u6210\u4e3a\u8bbe\u5907\u6587\u4ef6\u3002\u6240\u6709\u8bbe\u5907\u90fd\u4ee5\u6587\u4ef6\u7684\u5f62\u5f0f\u5b58\u653e\u5728\/dev \u76ee\u5f55\u4e0b&#xff0c;\u5e76\u4e14\u901a\u8fc7\u6587\u4ef6\u7684\u65b9\u5f0f\u8fdb\u884c\u8bbf\u95ee&#xff0c;\u6bcf\u4e2a\u6587\u4ef6\u90fd\u662f\u4e00\u4e2a\u8bbe\u5907\u8282\u70b9&#xff0c;\u8fd9\u4e9b\u8bbe\u5907\u8282\u70b9\u662f\u8fde\u63a5\u5185\u6838\u4e0e\u7528\u6237\u7a7a\u95f4\u7684\u67a2\u7ebd\u3002<\/p>\n<h4>2.2.1 cdev \u7ed3\u6784\u4f53<\/h4>\n<p>\u5185\u6838\u7528 struct cdev \u7ed3\u6784\u4f53\u6765\u63cf\u8ff0\u4e00\u4e2a\u5b57\u7b26\u8bbe\u5907&#xff0c;\u8be5\u7ed3\u6784\u4f53\u5728\u5185\u6838\u6e90\u7801\u4e2d\u5b9a\u4e49\u5982\u4e0b&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260210074917-698ae2fd8c4a1.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>struct kobject kobj\u662f\u5185\u5d4c\u7684\u5185\u6838\u5bf9\u8c61&#xff0c;\u5c31\u662f\u901a\u8fc7\u5b83\u624d\u5c06\u8bbe\u5907\u7edf\u4e00\u52a0\u5165\u5230 Linux \u8bbe\u5907\u9a71\u52a8\u6a21\u578b\u4e2d\u7ba1\u7406\u3002<\/p>\n<p>struct module *owner&#xff0c;\u8fd9\u662f\u9a71\u52a8\u7a0b\u5e8f\u6240\u5728\u7684\u5185\u6838\u6a21\u5757\u5bf9\u8c61\u7684\u6307\u9488\u3002<\/p>\n<p>const struct file_operations *ops\u7ed3\u6784\u4f53\u4e2d\u5b9a\u4e49\u4e86\u6587\u4ef6\u64cd\u4f5c&#xff0c;\u5305\u542b\u4e86\u5bf9\u6587\u4ef6\u8fdb\u884c\u6253\u5f00&#xff0c;\u5173\u95ed&#xff0c;\u8bfb\u5199\u7b49\u64cd\u4f5c\u7684\u51fd\u6570\u6307\u9488\u3002<\/p>\n<p>struct list_head list\u5c06\u7cfb\u7edf\u4e2d\u7684\u5b57\u7b26\u8bbe\u5907\u7528\u8fd9\u4e2a\u94fe\u8868\u96c6\u4e2d\u8d77\u6765&#xff0c;\u8fd9\u662f\u4fb5\u5165\u5f0f\u94fe\u8868&#xff0c;\u5185\u6838\u6e90\u7801\u4e2d\u7ecf\u5e38\u80fd\u770b\u5230\u5b83\u3002<\/p>\n<p>dev_t dev\u662f\u5b57\u7b26\u8bbe\u5907\u7684\u8bbe\u5907\u53f7\u3002<\/p>\n<p>unsigned int count\u8868\u793a\u5c5e\u4e8e\u540c\u4e00\u4e3b\u8bbe\u5907\u53f7\u7684\u6b21\u8bbe\u5907\u53f7\u7684\u4e2a\u6570\u3002<\/p>\n<h4>2.2.2 file_operations \u7ed3\u6784\u4f53<\/h4>\n<p>\u7b80\u5355\u6982\u62ec\u4e00\u4e0b\u8fd9\u4e2a\u7ed3\u6784\u4f53&#xff0c;\u8fd9\u4e2a\u7ed3\u6784\u4f53\u4e2d\u7684\u6210\u5458\u90fd\u662f\u51fd\u6570\u6307\u9488&#xff0c;\u6211\u4eec\u5728\u7f16\u5199\u9a71\u52a8\u7a0b\u5e8f\u65f6\u9700\u8981\u7f16\u5199\u5bf9\u5e94\u7684\u51fd\u6570\u5e76\u8ba9\u76f8\u5e94\u7684\u51fd\u6570\u6307\u9488\u6307\u5411\u8fd9\u4e2a\u51fd\u6570&#xff0c;\u4ece\u800c\u4f7f\u5f97\u7528\u6237\u7a7a\u95f4\u6267\u884c\u67d0\u4e2a\u64cd\u4f5c\u65f6&#xff0c;\u6700\u7ec8\u63a7\u5236\u6743\u4f1a\u901a\u8fc7 file_operations \u7ed3\u6784\u4f53\u4e2d\u7684\u51fd\u6570\u6307\u9488\u4ea4\u5230\u5bf9\u5e94\u7684\u6267\u884c\u51fd\u6570\u624b\u4e2d\u3002<\/p>\n<p>\u8be5\u7ed3\u6784\u4f53\u5728\u5185\u6838\u6e90\u7801\u4e2d\u7684\u5b9a\u4e49\u5982\u4e0b&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260210074917-698ae2fda57a8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\u5b83\u7684\u6210\u5458\u975e\u5e38\u591a&#xff0c;\u4f46\u662f\u5b9e\u9645\u4e0a\u6211\u4eec\u53ea\u4f1a\u7528\u5230\u5176\u4e2d\u7684\u4e00\u5c0f\u90e8\u5206&#xff0c;\u5176\u4ed6\u672a\u7528\u5230\u7684\u51fd\u6570\u6307\u9488\u7f6e\u4f4dNULL\u3002\u4e0b\u9762\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e2a\u6700\u5e38\u7528\u7684&#xff1a;<\/p>\n<p>struct module *owner\u4e00\u822c\u586bTHIS_MODULE&#xff0c;\u7528\u6765\u9632\u6b62\u6a21\u5757\u88ab\u5378\u8f7d\u3002<\/p>\n<p>llseek\u7528\u4e8e\u4fee\u6539\u5f53\u524d\u6587\u4ef6\u7684\u8bfb\u5199\u4f4d\u7f6e&#xff0c;\u8fd4\u56de\u503c\u4f4d\u504f\u79fb\u540e\u7684\u4f4d\u7f6e\u3002\u7b2c\u4e00\u4e2a\u53c2\u6570struct file *\u4e3a\u5bf9\u5e94\u7684\u6587\u4ef6\u6307\u9488&#xff0c;\u7b2c\u4e8c\u4e2a\u53c2\u6570loff_t\u6307\u5b9a\u504f\u79fb\u91cf\u7684\u5927\u5c0f&#xff0c;\u7b2c\u4e09\u4e2a\u53c2\u6570int\u7528\u4e8e\u8bf4\u660e\u4ece\u6587\u4ef6\u7684\u54ea\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u504f\u79fb&#xff0c;\u6bd4\u5982SEEK_CUR \u8868\u793a\u4ece\u5f53\u524d\u4f4d\u7f6e\u5f00\u59cb\u504f\u79fb\u3002<\/p>\n<p>read\u7528\u4e8e\u8bfb\u53d6\u8bbe\u5907\u4e2d\u7684\u6570\u636e&#xff0c;\u5e76\u8fd4\u56de\u6210\u529f\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002\u8be5\u51fd\u6570\u6307\u9488\u88ab\u7f6e\u4f4dNULL\u65f6&#xff0c;\u5728\u7528\u6237\u7a0b\u5e8f\u4e2d\u5bf9\u8be5\u6587\u4ef6\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528read\u5c31\u4f1a\u62a5\u9519\u3002\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f9d\u7136\u662f\u8981\u8bfb\u53d6\u6587\u4ef6\u7684\u6587\u4ef6\u6307\u9488\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662fchar __user *\u7c7b\u578b\u7684\u7f13\u51b2\u533a&#xff0c;__user \u7528\u4e8e\u4fee\u9970\u53d8\u91cf&#xff0c;\u8868\u660e\u8be5\u53d8\u91cf\u6240\u5728\u7684\u5730\u5740\u7a7a\u95f4\u5c5e\u4e8e\u7528\u6237\u7a7a\u95f4&#xff0c;\u5185\u6838\u6a21\u5757\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u8be5\u6570\u636e&#xff0c;\u9700\u8981\u4f7f\u7528 copy_to_user \u51fd\u6570\u6765\u8fdb\u884c\u64cd\u4f5c\u3002\u7b2c\u4e09\u4e2a\u53c2\u6570\u6307\u5b9a\u8981\u8bfb\u53d6\u6570\u636e\u7684\u5b57\u8282\u6570\u3002\u7b2c\u56db\u4e2a\u53c2\u6570\u8868\u793a\u8bfb\u53d6\u7684\u504f\u79fb\u4f4d\u7f6e&#xff0c;\u4ece\u6587\u4ef6\u7684\u54ea\u4e2a\u5730\u65b9\u5f00\u59cb\u8bfb\u3002<\/p>\n<p>write\u7528\u4e8e\u5411\u8bbe\u5907\u5199\u5165\u6570\u636e&#xff0c;\u5e76\u8fd4\u56de\u6210\u529f\u5199\u5165\u7684\u5b57\u8282\u6570&#xff0c;\u5728\u8bbf\u95ee __user \u4fee\u9970\u7684\u6570\u636e\u7f13\u51b2\u533a\u65f6&#xff0c;\u9700\u8981\u5148\u4f7f\u7528copy_from_user\u51fd\u6570\u5c06\u6570\u636e\u4ece\u7528\u6237\u7a7a\u95f4\u62f7\u8d1d\u5230\u5185\u6838\u7a7a\u95f4\u7684\u7f13\u51b2\u533a&#xff0c;\u7136\u540e\u518d\u5c06\u5185\u6838\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u5199\u5165\u5230\u8bbe\u5907\u6587\u4ef6\u3002<\/p>\n<p>open\u6307\u5411\u7684\u51fd\u6570\u662f\u8bbe\u5907\u9a71\u52a8\u7b2c\u4e00\u4e2a\u88ab\u6267\u884c\u7684\u51fd\u6570&#xff0c;\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\u4e00\u822c\u8981\u521d\u59cb\u5316\u786c\u4ef6\u3002\u5982\u679c\u8fd9\u4e2a\u6307\u9488\u88ab\u7f6e\u4f4dNULL&#xff0c;\u5219\u8bf4\u660e\u6253\u5f00\u8fd9\u4e2a\u8bbe\u5907\u7684\u64cd\u4f5c\u5c06\u4f1a\u6c38\u8fdc\u6210\u529f\u3002<\/p>\n<p>release\u6307\u9488\u6307\u5411\u7684\u51fd\u6570\u5728file\u7ed3\u6784\u4f53\u88ab\u91ca\u653e\u65f6\u5c31\u4f1a\u88ab\u8c03\u7528\u3002<\/p>\n<h4>2.2.3 struct file \u7ed3\u6784\u4f53<\/h4>\n<p>\u5185\u6838\u4e2d\u4f7f\u7528struct file\u7ed3\u6784\u4f53\u6765\u8868\u793a\u6bcf\u4e2a\u6253\u5f00\u7684\u6587\u4ef6\u3002\u4e5f\u5c31\u662f\u8bf4\u6bcf\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u5185\u6838\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2astruct file\u7ed3\u6784\u4f53&#xff0c;\u5e76\u5c06\u5bf9<br \/>\n\u8be5\u6587\u4ef6\u7684\u64cd\u4f5c\u51fd\u6570\u4f20\u9012\u7ed9\u8be5\u7ed3\u6784\u4f53\u7684\u6210\u5458\u53d8\u91cf f_op&#xff0c;\u5f53\u6587\u4ef6\u6240\u6709\u5b9e\u4f8b\u88ab\u5173\u95ed\u540e&#xff0c;\u5185\u6838\u624d\u4f1a\u91ca\u653e\u8fd9\u4e2a\u7ed3\u6784\u4f53\u3002<\/p>\n<p>\u8be5\u7ed3\u6784\u4f53\u5728\u5185\u6838\u6e90\u7801\u4e2d\u7684\u5b9a\u4e49\u5982\u4e0b&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260210074918-698ae2fe28928.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u4e2a\u7ed3\u6784\u4f53\u6210\u5458\u4e5f\u5f88\u591a&#xff0c;\u4f46\u6211\u4eec\u53ea\u9700\u8981\u5173\u6ce8\u5176\u4e2d\u7684\u4e24\u4e2a\u3002\u5206\u522b\u662ff_op\u548cprivate_data\u3002<\/p>\n<p>f_op\u5c31\u662f\u7528\u6765\u5b58\u653e\u6587\u4ef6\u64cd\u4f5c\u76f8\u5173\u51fd\u6570\u6307\u9488\u7684\u3002<\/p>\n<p>private_data \u6307\u9488\u53d8\u91cf\u53ea\u4f1a\u7528\u4e8e\u8bbe\u5907\u9a71\u52a8\u7a0b\u5e8f\u4e2d&#xff0c;\u5185\u6838\u5e76\u4e0d\u4f1a\u5bf9\u8be5\u6210\u5458\u8fdb\u884c\u64cd\u4f5c\u3002\u56e0\u6b64&#xff0c;\u5728\u9a71\u52a8\u7a0b\u5e8f\u4e2d&#xff0c;\u901a\u5e38\u7528\u4e8e\u6307\u5411\u63cf\u8ff0\u8bbe\u5907\u7684\u7ed3\u6784\u4f53\u3002\u6bd4\u5982&#xff0c;\u53ef\u4ee5\u5728 open() \u4e2d\u5206\u914d\u4e00\u4e2a\u7ed3\u6784\u4f53&#xff0c;\u4fdd\u5b58\u8bbe\u5907\u72b6\u6001&#xff0c;\u6bd4\u5982\u7f13\u51b2\u533a\u3001\u9501\u7b49&#xff0c;\u5728 release() \u4e2d\u91ca\u653e\u3002<\/p>\n<h4>2.2.4 inode \u7ed3\u6784\u4f53<\/h4>\n<p>inode \u7ed3\u6784\u4f53\u5728\u5185\u6838\u5185\u90e8\u8868\u793a\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u662f Linux \u7ba1\u7406\u6587\u4ef6\u7cfb\u7edf\u7684\u6700\u57fa\u672c\u7684\u5355\u4f4d\u3002\u5b83\u4e0estruct file\u7ed3\u6784\u4f53\u662f\u5b8c\u5168\u4e0d\u540c\u7684&#xff0c;struct file \u8868\u793a\u4e00\u4e2a\u5df2\u7ecf\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u800c\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u662f\u8fdb\u57ce\u79c1\u6709\u7684&#xff0c;\u8fd9\u6837\u8bf4\u5427&#xff0c;\u5bf9\u4e8e\u786c\u76d8\u4e0a\u7684\u4e00\u4e2a\u6587\u4ef6\u5b9e\u4f53&#xff0c;\u5b83\u53ef\u4ee5\u88ab\u4e0d\u540c\u7684\u8fdb\u7a0b\u540c\u65f6\u6253\u5f00&#xff0c;\u4e5f\u53ef\u4ee5\u88ab\u540c\u4e00\u4e2a\u8fdb\u7a0b\u6253\u5f00\u591a\u6b21&#xff0c;\u800c\u8fd9\u6bcf\u4e00\u6b21\u6253\u5f00\u5185\u6838\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a struct file \u7ed3\u6784\u4f53&#xff0c;\u7528\u4e8e\u8868\u793a\u8fd9\u4e2a\u6587\u4ef6\u672c\u6b21\u6253\u5f00\u7684\u5b9e\u4f8b\u3002\u800c\u5728\u4e0a\u9762\u7684struct file\u7ed3\u6784\u4f53\u7684\u5185\u6838\u6e90\u7801\u622a\u56fe\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6709\u4e00\u4e2a\u6210\u5458f_inode&#xff0c;\u4e0a\u9762\u63d0\u5230\u7684\u90a3\u4e48\u591a\u6b21\u6253\u5f00\u5bf9\u5e94\u7684\u90a3\u4e48\u591astruct file\u7ed3\u6784\u4f53&#xff0c;\u5b9e\u9645\u4e0a\u4ed6\u4eec\u7684f_inode\u6210\u5458\u6307\u5411\u7684\u662f\u540c\u4e00\u4e2astruct inode\u7ed3\u6784\u4f53\u3002\u8fd9\u5c31\u662f\u4e8c\u8005\u7684\u533a\u522b&#xff0c;\u4e00\u4e2a\u4ee3\u8868\u6587\u4ef6\u4e00\u6b21\u6253\u5f00\u7684\u5b9e\u4f8b&#xff0c;\u53e6\u4e00\u4e2a\u4ee3\u8868\u6587\u4ef6\u5728\u786c\u76d8\u4e0a\u7684\u5b9e\u4f53\u3002<\/p>\n<p>\u8fd9\u91cc\u6211\u4eec\u53ea\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u8fd9\u4e2a\u7ed3\u6784\u4f53\u7684\u6210\u5458&#xff0c;\u5c31\u4e0d\u8d34\u6e90\u7801\u4e86\u3002<\/p>\n<p>inode\u7ed3\u6784\u4f53\u5305\u542b\u6587\u4ef6\u7684\u8bbf\u95ee\u6743\u9650&#xff0c;\u6240\u6709\u8005&#xff0c;\u5927\u5c0f&#xff0c;\u521b\u5efa\u65f6\u95f4&#xff0c;\u4fee\u6539\u65f6\u95f4&#xff0c;\u8bbf\u95ee\u65f6\u95f4\u7b49\u4fe1\u606f&#xff0c;\u90fd\u662f\u4e00\u4e2a\u6587\u4ef6\u6700\u57fa\u672c\u7684\u4fe1\u606f\u3002<\/p>\n<h3>2.3 \u534f\u4f5c\u6d41\u7a0b<\/h3>\n<p>\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u5bf9struct file_operations\u3001struct cdev\u3001struct file \u548c struct inode \u8fd9\u51e0\u4e2a\u6838\u5fc3\u7ed3\u6784\u4f53\u6709\u4e86\u4e00\u4e2a\u521d\u6b65\u7684\u8ba4\u8bc6&#xff0c;\u4f46\u662f\u8fd9\u8fd8\u4e0d\u591f&#xff0c;\u6211\u4eec\u9700\u8981\u628a\u8fd9\u4e9b\u7ed3\u6784\u4f53\u4e32\u8d77\u6765&#xff0c;\u770b\u770b\u4ed6\u4eec\u5404\u81ea\u8d1f\u8d23\u54ea\u4e9b\u64cd\u4f5c\u3002<\/p>\n<p>\u5b83\u4eec\u4e4b\u95f4\u7684\u534f\u4f5c\u6d41\u7a0b\u7a76\u5176\u672c\u8d28\u8fd8\u8981\u5f52\u529f\u4e8e VFS \u865a\u62df\u6587\u4ef6\u7cfb\u7edf&#xff0c;VFS \u628a\u6240\u6709\u7684\u6587\u4ef6\u7edf\u4e00\u62bd\u8c61&#xff0c;\u4f7f\u5f97\u7528\u6237\u5c42\u53ef\u4ee5\u4f7f\u7528\u6700\u5e73\u5e38\u7684read\u548cwrite\u6765\u64cd\u4f5c\u8bbe\u5907\u6587\u4ef6&#xff0c;\u8fd9\u4e5f\u662f Linux 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