{"id":16513,"date":"2024-11-18T12:23:57","date_gmt":"2024-11-18T04:23:57","guid":{"rendered":"https:\/\/fwq.ai\/blog\/16513\/"},"modified":"2024-11-18T12:23:57","modified_gmt":"2024-11-18T04:23:57","slug":"linux%e9%a9%b1%e5%8a%a8-procfs%e6%8e%a5%e5%8f%a3%e5%88%9b%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/16513\/","title":{"rendered":"Linux\u9a71\u52a8 | procfs\u63a5\u53e3\u521b\u5efa"},"content":{"rendered":"

\u4e0a\u7bc7\u4ecb\u7ecd\u4e86Linux\u9a71\u52a8\u4e2dsysfs\u63a5\u53e3\u7684\u521b\u5efa\uff0c\u4eca\u5929\u4ecb\u7ecdprocfs\u63a5\u53e3\u7684\u521b\u5efa\u3002<\/p>\n

procfs\uff1a\u53ef\u5b9e\u73b0\u7c7b\u4f3ccat \/proc\/cpuinfo\u7684\u64cd\u4f5c<\/p>\n

<\/span>procfs\u63a5\u53e3\u521b\u5efa<\/span> <\/span> <\/h2>\n

\u5b9e\u73b0\u6548\u679c\uff1a<\/p>\n

\u4f8b\u5982, \u5728\/proc\u4e0b\u521b\u5efa\u4e00\u4e2aclk\u8282\u70b9\uff0c\u901a\u8fc7cat \/proc\/clk\u53ef\u67e5\u770b\u5185\u5bb9\uff1a<\/p>\n

\"Linux\u9a71\u52a8 <\/p>\n

\u4ee3\u7801\u5b9e\u73b0\uff1a<\/p>\n\n\n\n\n\n
\u7cfb\u7edf<\/th>\n\u5185\u6838\u7248\u672c<\/th>\n<\/tr>\n<\/thead>\n
Linux<\/td>\n4.9.88<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5728\u9a71\u52a8\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n

#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n\nstruct proc_dir_entry *my_proc_entry;\n\nstatic int proc_clk_show(struct seq_file *m, void *v)\n{\n    \/\/cat\u663e\u793a\u7684\u5185\u5bb9\n    seq_printf(m,\n          \"pll0: %u Mhz\n\"\n          \"pll1: %u Mhz\n\"\n          \"pll2: %u Mhz\n\",\n          100, 200, 300);\n   return 0;\n}\n\nstatic int clk_info_open(struct inode *inode, struct file *filp)\n{\n     return single_open(filp, proc_clk_show, NULL);\n}\n\nstatic struct file_operations myops = \n{\n      .owner = THIS_MODULE,\n      .open = clk_info_open,\n      .read = seq_read,\n      .llseek = seq_lseek,\n      .release = seq_release,\n};\n\nstatic int __init my_module_init(void)\n{\n    \/\/\u6ce8\u518cproc\u63a5\u53e3\n   my_proc_entry = proc_create(\"clk\", 0644, NULL, &amp;myops);\n\n    return 0;\n}\n\nstatic void __exit my_module_exit(void)\n{\n    \/\/\u6ce8\u9500proc\u63a5\u53e3\n   proc_remove(my_proc_entry);\n}\n\nmodule_init(my_module_init);\nmodule_exit(my_module_exit);\nMODULE_LICENSE(\"GPL\");<\/linux><\/linux><\/linux><\/linux><\/linux><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
procfs\u63a5\u53e3\u7684\u521b\u5efa\uff0c\u4e3b\u8981\u662f\u5b9e\u73b0struct file_operations\u7ed3\u6784\u4f53\uff0c\u7136\u540e\u901a\u8fc7proc_create\u51fd\u6570\u8fdb\u884c\u6ce8\u518c\uff0c\u901a\u8fc7proc_remove\u51fd\u6570\u8fdb\u884c\u6ce8\u9500\u3002<\/p>\n
procfs\u901a\u5e38\u662f\u7528\u6765\u83b7\u53d6CPU\u3001\u5185\u5b58\u3001\u8fdb\u7a0b\u7b49\u5404\u79cd\u4fe1\u606f\uff0c\u4f8b\u5982cat \/proc\/cpuinfo\u3001cat \/proc\/meminfo\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u9700\u8981\u5b9e\u73b0.open\u6210\u5458\u51fd\u6570\u3002\u5f53\u4f7f\u7528cat\u547d\u4ee4\u67e5\u770b\/proc\u4e0b\u7684\u4fe1\u606f\u65f6\uff0c\u4f1a\u8c03\u7528\u5230.open\u5bf9\u5e94\u7684\u5b9e\u73b0\u51fd\u6570\u3002<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528\u4e86seq_file\u63a5\u53e3\uff0c\u9700\u8981\u8bb0\u4f4f\u7684\u662f\uff0cprocfs\u901a\u5e38\u4f1a\u548cseq_file\u63a5\u53e3\u4e00\u8d77\u4f7f\u7528<\/strong>\u3002seq_file\u662f\u4e00\u4e2a\u5e8f\u5217\u6587\u4ef6\u63a5\u53e3\uff0c\u5f53\u6211\u4eec\u521b\u5efa\u7684proc\u6570\u636e\u5185\u5bb9\u7531\u4e00\u7cfb\u5217\u6570\u636e\u987a\u5e8f\u7ec4\u5408\u800c\u6210\u6216\u8005\u662f\u6bd4\u8f83\u5927\u7684proc\u6587\u4ef6\u7cfb\u7edf\u65f6\uff0c\u90fd\u5efa\u8bae\u4f7f\u7528seq_file\u63a5\u53e3<\/strong>\uff0c\u4f8b\u5982cat \/proc\/meminfo\u5c31\u4f1a\u663e\u793a\u5f88\u591a\u5185\u5bb9\u3002<\/p>\n
seq_file\u63a5\u53e3\u4e3b\u8981\u5c31\u662f\u89e3\u51b3proc\u63a5\u53e3\u7f16\u7a0b\u5b58\u5728\u7684\u95ee\u9898\uff0c\u63a8\u8350\u5728proc\u63a5\u53e3\u7f16\u7a0b\u65f6\u4f7f\u7528seq_file\u63a5\u53e3<\/strong>\uff0c\u53e6\u5916.read\u3001.llseek\u3001.release\u6210\u5458\u51fd\u6570\u4e5f\u53ef\u4ee5\u76f4\u63a5\u7528seq_read\u3001seq_lseek\u548cseq_release\u3002<\/p>\n
 <\/span>proc\u65b0\u63a5\u53e3<\/span> <\/span> <\/h2>\n
\u6ce8\u610f\uff0c\u5728\u8f83\u65b0\u7248\u672c\u7684\u5185\u6838\u4e2d\uff0cprocfs\u7684\u51fd\u6570\u63a5\u53e3\u6709\u6240\u53d8\u5316\u3002<\/p>\n\n\n\n\n\n
\u7cfb\u7edf<\/th>\n\u5185\u6838\u7248\u672c<\/th>\n<\/tr>\n<\/thead>\n
Linux<\/td>\n5.10.111<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5728\u9a71\u52a8\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n\nstruct proc_dir_entry *my_proc_entry;\n\nstatic int proc_clk_show(struct seq_file *m, void *v)\n{\n seq_printf(m,\n    \"pll0: %lu Mhz\n\"\n    \"pll1: %lu Mhz\n\"\n    \"pll2: %lu Mhz\n\",\n    100, 200, 300);\n return 0;\n}\n\nstatic int clk_info_open(struct inode *inode, struct file *filp)\n{\n return single_open(filp, proc_clk_show, NULL);\n}\n\nstatic const struct proc_ops clk_stat_proc_fops = {\n .proc_open = clk_info_open,\n .proc_read =  seq_read,\n .proc_lseek = seq_lseek,\n .proc_release = seq_release,\n};\n\nstatic int __init my_module_init(void)\n{\n   my_proc_entry = proc_create(\"clk\", 0, NULL, &amp;clk_stat_proc_fops);\n\n    return 0;\n}\n\nstatic void __exit my_module_exit(void)\n{\n   proc_remove(my_proc_entry);\n}\n\nmodule_init(my_module_init);\nmodule_exit(my_module_exit);\nMODULE_LICENSE(\"GPL\");<\/linux><\/linux><\/linux><\/linux><\/linux><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u65b0\u7684proc\u63a5\u53e3\u4e2d\uff0c\u5c06\u539f\u6765\u7684struct file_operations\u6362\u6210\u4e86struct proc_ops\uff0c\u5176\u4e2d\u6210\u5458\u51fd\u6570\u4e5f\u6dfb\u52a0\u4e86\u5bf9\u5e94\u7684\u524d\u7f00proc\uff0c\u4f46\u672c\u8d28\u8fd8\u662f\u4e00\u6837\u7684\uff0c\u53ea\u662f\u6362\u4e86\u540d\u5b57\uff0c\u66f4\u52a0\u89c4\u8303\u4e86\u4e00\u4e9b\u3002<\/p>\n<\/p>\n
\u4ee5\u4e0a\u5c31\u662fLinux\u9a71\u52a8 | procfs\u63a5\u53e3\u521b\u5efa\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e0a\u7bc7\u4ecb\u7ecd\u4e86Linux\u9a71\u52a8\u4e2dsysfs\u63a5\u53e3\u7684\u521b\u5efa\uff0c\u4eca\u5929\u4ecb\u7ecdprocfs\u63a5\u53e3\u7684\u521b\u5efa\u3002 procfs\uff1a\u53ef\u5b9e\u73b0\u7c7b\u4f3ccat \/proc\/cpuinfo\u7684\u64cd\u4f5c procfs\u63a5\u53e3\u521b\u5efa \u5b9e\u73b0\u6548\u679c\uff1a \u4f8b\u5982, \u5728\/proc\u4e0b\u521b\u5efa\u4e00\u4e2aclk\u8282\u70b9\uff0c\u901a\u8fc7cat \/proc\/clk\u53ef\u67e5\u770b\u5185\u5bb9\uff1a \u4ee3\u7801\u5b9e\u73b0\uff1a \u7cfb\u7edf \u5185\u6838\u7248\u672c Linux 4.9.88 \u5728\u9a71\u52a8\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\uff1a #include <linux> #include <linux> #include <linux> #include <linux> #include <linux> struct proc_dir_entry *my_proc_entry; static int proc_clk_show(struct seq_file *m, void *v) {     \/\/cat\u663e\u793a\u7684\u5185\u5bb9     seq_printf(m,           “pll0: %u Mhz ”           “pll1: %u Mhz ”           “pll2: %u Mhz “,           100, 200, 300);    return 0; } static int clk_info_open(struct inode *inode, struct file *filp) {      return single_open(filp, proc_clk_show, NULL); } static struct file_operations myops =  {       .owner = THIS_MODULE,       .open = clk_info_open,       .read = seq_read,       .llseek = seq_lseek,       .release = seq_release, }; static int __init my_module_init(void) {     \/\/\u6ce8\u518cproc\u63a5\u53e3    my_proc_entry = proc_create(“clk”, 0644, NULL, &amp;myops);     return 0; } static void __exit my_module_exit(void) {     \/\/\u6ce8\u9500proc\u63a5\u53e3    proc_remove(my_proc_entry); […]<\/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-16513","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/16513","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=16513"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/16513\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=16513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=16513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=16513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}