{"id":62005,"date":"2025-04-29T09:46:37","date_gmt":"2025-04-29T01:46:37","guid":{"rendered":"https:\/\/fwq.ai\/blog\/62005\/"},"modified":"2025-04-29T09:46:37","modified_gmt":"2025-04-29T01:46:37","slug":"linux%e5%86%85%e6%a0%b8%e5%9f%ba%e7%a1%80%e7%af%87-container_of%e5%8e%9f%e7%90%86%e5%92%8c%e5%ae%9e%e9%99%85%e5%ba%94%e7%94%a8-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/62005\/","title":{"rendered":"Linux\u5185\u6838\u57fa\u7840\u7bc7\u2014\u2014container_of\u539f\u7406\u548c\u5b9e\u9645\u5e94\u7528"},"content":{"rendered":"

Linux\u5185\u6838\u4e2d\u7ecf\u5e38\u53ef\u89c1container_of\u7684\u8eab\u5f71\uff0c\u5b83\u5728\u5b9e\u9645\u9a71\u52a8\u7684\u7f16\u5199\u4e2d\u4e5f\u662f\u5e7f\u6cdb\u5e94\u7528\u3002<\/p>\n

<\/span>container_of\u539f\u7406<\/span> <\/span> <\/h2>\n

\u4f5c\u7528<\/strong>\uff1a\u901a\u8fc7\u7ed3\u6784\u4f53\u7684\u67d0\u4e2a\u6210\u5458\u53d8\u91cf\u5730\u5740<\/strong>\u627e\u5230\u8be5\u7ed3\u6784\u4f53\u7684\u9996\u5730\u5740<\/strong>\u3002<\/p>\n

\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n

\/**\n * container_of - cast a member of a structure out to the containing structure\n * @ptr:    the pointer to the member.\n * @type:   the type of the container struct this is embedded in.\n * @member: the name of the member within the struct.\n *\n *\/\n#define container_of(ptr, type, member) ({          \n    const typeof( ((type *)0)-&gt;member ) *__mptr = (ptr); \n    (type *)( (char *)__mptr - offsetof(type,member) );})<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    \n
  •   ptr\uff1a\u7ed3\u6784\u4f53\u6210\u5458\u53d8\u91cf\u7684\u6307\u9488 <\/li>\n
  •   type\uff1a\u7ed3\u6784\u4f53\u7c7b\u578b <\/li>\n
  •   member\uff1a\u7ed3\u6784\u4f53\u6210\u5458\u53d8\u91cf\u7684\u540d\u5b57 <\/li>\n<\/ul>\n
    \u6362\u53e5\u8bdd\u8bf4\uff0c\u53eb\uff1a\u5df2\u77e5\u7ed3\u6784\u4f53type\u7684\u6210\u5458member\u7684\u5730\u5740ptr\uff0c\u6c42\u89e3\u7ed3\u6784\u4f53type\u7684\u8d77\u59cb\u5730\u5740<\/strong>\u3002<\/p>\n
    \u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1atype\u7684\u8d77\u59cb\u5730\u5740 = ptr -size \uff08size\u4e3amember\u7684\u5927\u5c0f\uff09<\/strong><\/p>\n
    \u4ee5\u4e00\u5e45\u56fe\u8bf4\u660eptr\u3001type\u3001member\u7684\u5173\u7cfb\uff1a<\/p>\n
    \"Linux\u5185\u6838\u57fa\u7840\u7bc7\u2014\u2014container_of\u539f\u7406\u548c\u5b9e\u9645\u5e94\u7528\u63d2\u56fe\"  <\/p>\n
      \n
    •   \u539f\u7406\u7b80\u8ff0\uff1a <\/li>\n<\/ul>\n
      container_of\u7684\u5999\u5904\u5c31\u5728\u4e8e\u4ee50\u4f5c\u4e3a\u6210\u5458\u53d8\u91cfmember\u7684\u57fa\u5740<\/strong>\u3002<\/p>\n
      \u5176\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e2d\u95f4\u53d8\u91cf__mptr\uff0c”__”\u4ee3\u8868\u5185\u90e8\u4f7f\u7528\uff0c\u201cm\u201d\u4ee3\u8868middle\u3002<\/p>\n
      #define offsetof(TYPE, MEMBER) ((size_t) &amp;((TYPE *)0)-&gt;MEMBER)<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      typeof( ((type *)0)->member )\u662f\u83b7\u53d6member\u7684\u7c7b\u578b\uff0c__mptr = (ptr)\u5224\u65adptr\u4e0emember\u662f\u5426\u4e3a\u540c\u4e00\u7c7b\u578b\uff0coffsetof\u8ba1\u7b97\u6210\u5458member\u7684\u5927\u5c0fsize\u3002<\/p>\n
       <\/span>\u9a71\u52a8\u4e2d\u7684\u5b9e\u9645\u4f8b\u5b50<\/span> <\/span> <\/h2>\n
      \u4f8b\u5982\u5185\u6838\u7684pwm\u9a71\u52a8\uff0c\u901a\u8fc7\u6210\u5458\u53d8\u91cfchip\uff0c\u627e\u5230\u7ed3\u6784\u4f53bcm2835_pwm\uff1a<\/p>\n
      struct bcm2835_pwm {\n struct pwm_chip chip;\n struct device *dev;\n void __iomem *base;\n struct clk *clk;\n};\n\nstatic inline struct bcm2835_pwm *to_bcm2835_pwm(struct pwm_chip *chip_ptr)\n{\n return container_of(chip_ptr, struct bcm2835_pwm, chip);\n}<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \u4f7f\u7528container_of\u901a\u5e38\u90fd\u4f1a\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\uff0c\u5e76\u4e14\u547d\u540d\u4e3ato_xxx\u6216\u8005to_find_xxx\uff0c\u4ee3\u8868\u8981\u627exxx\u8fd9\u4e2a\u7ed3\u6784\u4f53\uff0c\u4f20\u53c2\u5219\u4f20\u5165\u6210\u5458\u53d8\u91cf\u6307\u9488\uff0c\u53e6\u5916\u51fd\u6570\u4e5f\u4f1a\u58f0\u660e\u4e3ainline\u3002<\/p>\n<\/p>\n
      \u4ee5\u4e0a\u5c31\u662fLinux\u5185\u6838\u57fa\u7840\u7bc7\u2014\u2014container_of\u539f\u7406\u548c\u5b9e\u9645\u5e94\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8FDCServers\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      Linux\u5185\u6838\u4e2d\u7ecf\u5e38\u53ef\u89c1container_of\u7684\u8eab\u5f71\uff0c\u5b83\u5728\u5b9e\u9645\u9a71\u52a8\u7684\u7f16\u5199\u4e2d\u4e5f\u662f\u5e7f\u6cdb\u5e94\u7528\u3002 container_of\u539f\u7406 \u4f5c\u7528\uff1a\u901a\u8fc7\u7ed3\u6784\u4f53\u7684\u67d0\u4e2a\u6210\u5458\u53d8\u91cf\u5730\u5740\u627e\u5230\u8be5\u7ed3\u6784\u4f53\u7684\u9996\u5730\u5740\u3002 \u5b9a\u4e49\u5982\u4e0b\uff1a \/**  * container_of – cast a member of a structure out to the containing structure  * @ptr:    the pointer to the member.  * @type:   the type of the container struct this is embedded in.  * @member: the name of the member within the struct.  *  *\/ #define container_of(ptr, type, member) ({               const typeof( ((type *)0)-&gt;member ) *__mptr = (ptr);      (type *)( (char *)__mptr – offsetof(type,member) );}) \u767b\u5f55\u540e\u590d\u5236 ptr\uff1a\u7ed3\u6784\u4f53\u6210\u5458\u53d8\u91cf\u7684\u6307\u9488 type\uff1a\u7ed3\u6784\u4f53\u7c7b\u578b member\uff1a\u7ed3\u6784\u4f53\u6210\u5458\u53d8\u91cf\u7684\u540d\u5b57 \u6362\u53e5\u8bdd\u8bf4\uff0c\u53eb\uff1a\u5df2\u77e5\u7ed3\u6784\u4f53type\u7684\u6210\u5458member\u7684\u5730\u5740ptr\uff0c\u6c42\u89e3\u7ed3\u6784\u4f53type\u7684\u8d77\u59cb\u5730\u5740\u3002 \u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1atype\u7684\u8d77\u59cb\u5730\u5740 = ptr -size \uff08size\u4e3amember\u7684\u5927\u5c0f\uff09 \u4ee5\u4e00\u5e45\u56fe\u8bf4\u660eptr\u3001type\u3001member\u7684\u5173\u7cfb\uff1a \u539f\u7406\u7b80\u8ff0\uff1a container_of\u7684\u5999\u5904\u5c31\u5728\u4e8e\u4ee50\u4f5c\u4e3a\u6210\u5458\u53d8\u91cfmember\u7684\u57fa\u5740\u3002 \u5176\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e2d\u95f4\u53d8\u91cf__mptr\uff0c”__”\u4ee3\u8868\u5185\u90e8\u4f7f\u7528\uff0c\u201cm\u201d\u4ee3\u8868middle\u3002 #define offsetof(TYPE, MEMBER) ((size_t) &amp;((TYPE *)0)-&gt;MEMBER) \u767b\u5f55\u540e\u590d\u5236 typeof( ((type *)0)->member )\u662f\u83b7\u53d6member\u7684\u7c7b\u578b\uff0c__mptr = (ptr)\u5224\u65adptr\u4e0emember\u662f\u5426\u4e3a\u540c\u4e00\u7c7b\u578b\uff0coffsetof\u8ba1\u7b97\u6210\u5458member\u7684\u5927\u5c0fsize\u3002 \u9a71\u52a8\u4e2d\u7684\u5b9e\u9645\u4f8b\u5b50 \u4f8b\u5982\u5185\u6838\u7684pwm\u9a71\u52a8\uff0c\u901a\u8fc7\u6210\u5458\u53d8\u91cfchip\uff0c\u627e\u5230\u7ed3\u6784\u4f53bcm2835_pwm\uff1a struct bcm2835_pwm {  struct pwm_chip chip;  struct device *dev;  void __iomem *base;  struct clk *clk; }; static inline struct bcm2835_pwm *to_bcm2835_pwm(struct pwm_chip *chip_ptr) {  return container_of(chip_ptr, struct bcm2835_pwm, chip); } \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528container_of\u901a\u5e38\u90fd\u4f1a\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\uff0c\u5e76\u4e14\u547d\u540d\u4e3ato_xxx\u6216\u8005to_find_xxx\uff0c\u4ee3\u8868\u8981\u627exxx\u8fd9\u4e2a\u7ed3\u6784\u4f53\uff0c\u4f20\u53c2\u5219\u4f20\u5165\u6210\u5458\u53d8\u91cf\u6307\u9488\uff0c\u53e6\u5916\u51fd\u6570\u4e5f\u4f1a\u58f0\u660e\u4e3ainline\u3002 \u4ee5\u4e0a\u5c31\u662fLinux\u5185\u6838\u57fa\u7840\u7bc7\u2014\u2014container_of\u539f\u7406\u548c\u5b9e\u9645\u5e94\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8FDCServers\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-62005","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62005","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=62005"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62005\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=62005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=62005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=62005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}