{"id":3030,"date":"2011-05-19T17:46:46","date_gmt":"2011-05-19T09:46:46","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=3030"},"modified":"2012-06-09T15:40:46","modified_gmt":"2012-06-09T07:40:46","slug":"proc%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f%e4%b9%8b%e7%94%a8%e6%88%b7%e6%80%81%e5%92%8c%e5%86%85%e6%a0%b8%e6%80%81%e7%9a%84%e6%95%b0%e6%8d%ae%e9%80%9a%e4%bf%a1","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/3030","title":{"rendered":"\u5bf9\/proc\u6587\u4ef6\u7cfb\u7edf\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c"},"content":{"rendered":"

\u672c\u535a\u5ba2\u4e4b\u524d\u7684\u6587\u7ae0\u4e2d\u591a\u6b21\u6d89\u53ca\u5230\/proc\u6587\u4ef6\u7cfb\u7edf\uff0c\u4e0b\u9762\u7684\u51e0\u6761\u547d\u4ee4\u90fd\u5728\u66fe\u7ecf\u7684\u6587\u7ae0\u4e2d\u51fa\u73b0\u8fc7\uff1a<\/p>\n

cat \/proc\/interrupts\r\ncat \/proc\/devices\r\ncat \/proc\/kallsyms | grep super_blocks<\/pre>\n
\u7b2c\u4e00\u6761\u547d\u4ee4\u7528\u4e8e\u67e5\u770b\u7cfb\u7edf\u5185\u5df2\u6ce8\u518c\u7684\u4e2d\u65ad<\/a>\u4fe1\u606f\uff0c\u5305\u62ec\u4e2d\u65ad\u53f7\u3001\u5df2\u63a5\u53d7\u7684\u624b\u6bb5\u8bf7\u6c42\u548c\u9a71\u52a8\u5668\u540d\u79f0\u7b49\uff1b\u7b2c\u4e8c\u6761\u547d\u4ee4\u7528\u4e8e\u67e5\u770b\u7cfb\u7edf\u5185\u5df2\u6ce8\u518c\u7684\u5b57\u7b26\u8bbe\u5907<\/a>\u548c\u5757\u8bbe\u5907\u4fe1\u606f\uff0c\u5305\u62ec\u8bbe\u5907\u53f7\u548c\u8bbe\u5907\u540d\u79f0\uff1b\u7b2c\u4e09\u6761\u547d\u4ee4\u7528\u4e8e\u5728\u5185\u6838\u7b26\u53f7\u8868\u4e2d\u68c0\u7d22super_blocks<\/a>\u7b26\u53f7\u7684\u7684\u5730\u5740\uff0ckallsyms\u6587\u4ef6\u5305\u62ec\u5185\u6838\u4e2d\u6240\u6709\u7684\u6807\u793a\u7b26\u53ca\u5176\u5730\u5740\u3002<\/p>\n
1.\u6982\u8ff0<\/h4>\n
proc\u5373process\u7684\u7f29\u5199\uff0c\u6700\u521d\u7684proc\u6587\u4ef6\u7cfb\u7edf\u53ea\u662f\u5b58\u653e\u8fdb\u7a0b\u7684\u76f8\u5173\u4fe1\u606f\u3002\u4f46\u73b0\u5728\u7684\/proc\u6587\u4ef6\u7cfb\u7edf\u9664\u6b64\u4e4b\u5916\u8fd8\u5305\u542b\u7cfb\u7edf\u7684\u72b6\u6001\u4fe1\u606f\u548c\u914d\u7f6e\u4fe1\u606f\u3002
\n\u901a\u8fc7ls\u547d\u4ee4\u5c31\u53ef\u4ee5\u67e5\u770b\/proc\u6587\u4ef6\u7cfb\u7edf\u6240\u5305\u542b\u7684\u5185\u5bb9\u3002<\/p>\n
edsionte@edsionte-desktop:\/proc$ ls\r\n1      1290   1469  1541  1627   19612  29    49    9          dri              mdstat          sys\r\n10     13     1471  1544  1630   19613  3     5     908        driver           meminfo         sysrq-trigger\r\n1013   1301   1474  1548  1632   19629  30    50    913        edsionte_procfs  misc            sysvipc\r\n\u2026\u2026\u2026\u2026<\/pre>\n
\u5176\u4e2d\u4ee5\u6570\u5b57\u4e3a\u540d\u7684\u76ee\u5f55\u5373\u4e3a\u7cfb\u7edf\u4e2d\u6b63\u5728\u8fd0\u884c\u7684\u8fdb\u7a0b\u4fe1\u606f\uff0c\u6570\u5b57\u5373\u4e3a\u8fdb\u7a0b\u7684pid\u3002\u6bd4\u5982\u6211\u4eec\u53ef\u4ee5\u8fdb\u5165init\u8fdb\u7a0b\u7684\u76ee\u5f55\uff0c\u67e5\u770b\u5b83\u7684\u5730\u5740\u7a7a\u95f4\uff1a<\/p>\n
edsionte@edsionte-desktop:\/proc\/1$ sudo cat maps\r\n[sudo] password for edsionte:\r\n00110000-00263000 r-xp 00000000 08:07 704702     \/lib\/tls\/i686\/cmov\/libc-2.11.1.so\r\n00263000-00264000 ---p 00153000 08:07 704702     \/lib\/tls\/i686\/cmov\/libc-2.11.1.so\r\n00264000-00266000 r--p 00153000 08:07 704702     \/lib\/tls\/i686\/cmov\/libc-2.11.1.so\r\n00266000-00267000 rw-p 00155000 08:07 704702     \/lib\/tls\/i686\/cmov\/libc-2.11.1.so\r\n00267000-0026a000 rw-p 00000000 00:00 0\r\n0026a000-00272000 r-xp 00000000 08:07 704713     \/lib\/tls\/i686\/cmov\/libnss_nis-2.11.1.so\r\n00272000-00273000 r--p 00007000 08:07 704713     \/lib\/tls\/i686\/cmov\/libnss_nis-2.11.1.so\r\n00273000-00274000 rw-p 00008000 08:07 704713     \/lib\/tls\/i686\/cmov\/libnss_nis-2.11.1.so\r\n00471000-0048b000 r-xp 00000000 08:07 1048610    \/sbin\/init\r\n\u2026\u2026\u2026\u2026<\/pre>\n
\u9664\u4e86\u67e5\u770b\u8fdb\u7a0b\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6253\u5370\u76f8\u5173\u6587\u4ef6\u6765\u67e5\u770b\u7cfb\u7edf\u7684\u5f53\u524d\u8fd0\u884c\u72b6\u6001\u3002\u6bd4\u5982\u67e5\u770b\u5f53\u524d\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff1a<\/p>\n
edsionte@edsionte-desktop:\/proc$ cat meminfo\r\nMemTotal:         961368 kB\r\nMemFree:          145264 kB\r\nBuffers:           31648 kB\r\nCached:           297716 kB\r\nSwapCached:        14436 kB\r\n\u2026\u2026\u2026\u2026<\/pre>\n
\u603b\u4e4b\uff0c\/proc\u6587\u4ef6\u7cfb\u7edf\u76f8\u5f53\u4e8e\u5185\u6838\u7684\u4e00\u4e2a\u5feb\u7167\uff0c\u8be5\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u4fe1\u606f\u90fd\u662f\u52a8\u6001\u7684\u4ece\u6b63\u5728\u8fd0\u884c\u7684\u5185\u6838\u4e2d\u8bfb\u53d6\u3002<\/p>\n
\u57fa\u4e8e\u8fd9\u79cd\u539f\u56e0\uff0c\/proc\u6587\u4ef6\u7cfb\u7edf\u5c31\u6210\u4e3a\u4e86\u7528\u6237\u548c\u5185\u6838\u4e4b\u95f4\u4ea4\u4e92\u7684\u63a5\u53e3\u3002\u4e00\u65b9\u9762\uff0c\u7528\u6237\u53ef\u4ee5\u4ece\/proc\u6587\u4ef6\u7cfb\u7edf\u4e2d\u8bfb\u53d6\u5f88\u591a\u5185\u6838\u91ca\u653e\u51fa\u6765\u7684\u4fe1\u606f\uff1b\u53e6\u4e00\u65b9\u9762\uff0c\u5185\u6838\u4e5f\u53ef\u4ee5\u5728\u6070\u5f53\u7684\u65f6\u5019\u4ece\u7528\u6237\u90a3\u91cc\u5f97\u5230\u8f93\u5165\u4fe1\u606f\uff0c\u4ece\u800c\u6539\u53d8\u5185\u6838\u7684\u76f8\u5173\u72b6\u6001\u548c\u914d\u7f6e\u3002<\/p>\n
\u76f8\u6bd4\u4f20\u7edf\u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\/proc\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\u5373\u865a\u62df\u6587\u4ef6\u7cfb\u7edf\u3002\u8fd9\u91cc\u7684\u865a\u62df\u662f\u5f3a\u8c03\/proc\u6587\u4ef6\u7cfb\u7edf\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u90fd\u5b58\u5728\u4e8e\u5185\u5b58\u4e2d\u800c\u4e0d\u662f\u78c1\u76d8\u4e0a\u3002\u4e5f\u5c31\u662f\u8bf4\/proc\u6587\u4ef6\u7cfb\u7edf\u53ea\u5360\u7528\u5185\u5b58\u7a7a\u95f4\uff0c\u800c\u4e0d\u5360\u7528\u7cfb\u7edf\u7684\u5916\u5b58\u7a7a\u95f4\u3002<\/p>\n
2.\u7528\u6237\u6001\u548c\u5185\u6838\u6001\u4e4b\u95f4\u7684\u6570\u636e\u901a\u4fe1<\/h4>\n
\u65e2\u7136\u5185\u6838\u7684\u6570\u636e\u4ee5\/proc\u6587\u4ef6\u7cfb\u7edf\u7684\u5f62\u5f0f\u5448\u73b0\u7ed9\u7528\u6237\uff0c\u4e5f\u5c31\u662f\u8bf4\u5185\u6838\u7684\u4fe1\u606f\u4ee5\u6587\u4ef6\u7684\u5f62\u5f0f\u5b58\u5728\u4e8e\u8be5\u6587\u4ef6\u7cfb\u7edf\u4e2d\uff0c\u90a3\u4e48\/proc\u6587\u4ef6\u7cfb\u7edf\u5c31\u5e94\u5f53\u63d0\u4f9b\u4e00\u7ec4\u63a5\u53e3\u5bf9\u5176\u5185\u7684\u6587\u4ef6\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u3002\u63a5\u4e0b\u6765\u6211\u4eec\u4ee5\u4e00\u4e2a\u5b9e\u9645\u7684\u5185\u6838\u6a21\u5757\u7a0b\u5e8feasyProc.c\u4e3a\u4f8b\uff0c\u8bf4\u660e\/proc\u6587\u4ef6\u7cfb\u7edf\u7684\u5e38\u7528\u63a5\u53e3\u3002\u8be5\u7a0b\u5e8f\u4e2d\u4f9d\u6b21\u521b\u5efa\u4e86\u51e0\u4e2a\u865a\u62df\u6587\u4ef6\uff0c\u7136\u540e\u5728\u7528\u6237\u6001\u5bf9\u8fd9\u4e9b\u6587\u4ef6\u8fdb\u884c\u8bfb\u5199\u6d4b\u8bd5\u3002<\/p>\n
2.0\u6570\u636e\u7ed3\u6784<\/h5>\n
\u6bcf\u4e2a\u865a\u62df\u6587\u4ef6\u90fd\u5bf9\u5e94\u4e00\u4e2aproc_dir_entry\u7c7b\u578b\u7684\u6570\u636e\u7ed3\u6784\uff0c\u8be5\u7ed3\u6784\u5177\u4f53\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n
struct proc_dir_entry {\r\n\tconst char *name;\t\t\t\/\/ virtual file name\r\n\tmode_t mode;\t\t\t\t\/\/ mode permissions\r\n\tuid_t uid;\t\t\t\t\/\/ File's user id\r\n\tgid_t gid;\t\t\t\t\/\/ File's group id\r\n\tstruct inode_operations *proc_iops;\t\/\/ Inode operations functions\r\n\tstruct file_operations *proc_fops;\t\/\/ File operations functions\r\n\tstruct proc_dir_entry *parent;\t\t\/\/ Parent directory\r\n\t...\r\n\tread_proc_t *read_proc;\t\t\t\/\/ \/proc read function\r\n\twrite_proc_t *write_proc;\t\t\/\/ \/proc write function\r\n\tvoid *data;\t\t\t\t\/\/ Pointer to private data\r\n\tatomic_t count;\t\t\t\t\/\/ use count\r\n\t...\r\n};<\/pre>\n
\u9664\u4e86\u4fdd\u5b58\u8be5\u865a\u62df\u6587\u4ef6\u7684\u57fa\u672c\u4fe1\u606f\u5916\uff0c\u8be5\u7ed3\u6784\u4e2d\u8fd8\u6709read_proc\u548cwrite_proc\u4e24\u4e2a\u5b57\u6bb5\uff0c\u4e0b\u6587\u4e2d\u5c06\u6709\u8be6\u7ec6\u8bf4\u660e\u3002<\/p>\n
2.1\u521b\u5efa\u76ee\u5f55<\/h5>\n
\/proc\u6587\u4ef6\u7cfb\u7edf\u4e2d\u521b\u5efa\u4e00\u4e2a\u76ee\u5f55\u5bf9\u5e94\u7684\u51fd\u6570\u63a5\u53e3\u5982\u4e0b\uff1a
\nstruct proc_dir_entry *proc_mkdir(const char *name,struct proc_dir_entry *parent);
\n\u5176\u4e2dname\u4e3a\u8981\u521b\u5efa\u7684\u76ee\u5f55\u540d\uff1bparent\u4e3a\u8fd9\u4e2a\u76ee\u5f55\u7684\u7236\u76ee\u5f55\uff0c\u5f53\u8981\u521b\u5efa\u7684\u76ee\u5f55\u4f4d\u4e8e\/proc\u4e0b\u65f6\u6b64\u53c2\u6570\u4e3a\u7a7a\u3002\u6bd4\u5982\u6211\u4eec\u4f7f\u7528\u8be5\u51fd\u6570\u5728\/proc\u4e0b\u521b\u5efa\u4e00\u4e2a\u76ee\u5f55edsionte_procfs\u3002<\/p>\n
#define MODULE_NAME \"edsionte_procfs\"\r\nstruct proc_dir_entry *example_dir;\r\n\texample_dir = proc_mkdir(MODULE_NAME, NULL);\r\n\tif (example_dir == NULL) {\r\n\t\trv = -ENOMEM;\r\n\t\tgoto out;\r\n\t}<\/pre>\n
2.2\u521b\u5efa\u666e\u901a\u6587\u4ef6<\/h5>\n
\u5728\/proc\u6587\u4ef6\u7cfb\u7edf\u4e2d\u521b\u5efa\u4e00\u4e2a\u865a\u62df\u6587\u4ef6\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684\u51fd\u6570\uff1a<\/p>\n
 static inline struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode, struct proc_dir_entry *parent) ;<\/pre>\n
\u8be5\u51fd\u6570\u4e2dname\u4e3a\u8981\u521b\u5efa\u7684\u6587\u4ef6\u540d\uff1bmode\u4e3a\u521b\u5efa\u6587\u4ef6\u7684\u5c5e\u6027\uff1bparent\u6307\u5411\u8be5\u6587\u4ef6\u7236\u76ee\u5f55\u7684\u6307\u9488\uff0c\u5982\u679c\u521b\u5efa\u7684\u865a\u62df\u6587\u4ef6\u4f4d\u4e8e\/proc\u4e0b\uff0c\u5219\u8fd9\u4e2a\u53c2\u6570\u4e3aNULL\u3002<\/p>\n
\u6bd4\u5982\u6211\u4eec\u901a\u8fc7\u8be5\u51fd\u6570\u5728\/proc\/edsionte_procfs\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2a\u865a\u62df\u6587\u4ef6foo\uff0c\u5176\u6743\u9650\u4e3a644\u3002\u5176\u4e2dexample_dir\u6307\u5411\u6211\u4eec\u521a\u521b\u5efa\u7684\u76ee\u5f55\u6587\u4ef6edsionte_procfs\u3002<\/p>\n
struct proc_dir_entry  *foo_file;\r\n\tfoo_file = create_proc_entry(\"foo\", 0644, example_dir);\r\n\tif (foo_file == NULL) {\r\n\t\trv = -ENOMEM;\r\n\t\tgoto no_foo;\r\n\t}<\/pre>\n
2.3.\u521b\u5efa\u7b26\u53f7\u94fe\u63a5\u6587\u4ef6<\/h5>\n
\u5f53\u6211\u4eec\u9700\u8981\u5728\/proc\u6587\u4ef6\u7cfb\u7edf\u4e0b\u521b\u5efa\u4e00\u4e2a\u7b26\u53f7\u94fe\u63a5\u6587\u4ef6\u65f6\uff0c\u53ef\u4f7f\u7528\u5982\u4e0b\u63a5\u53e3\uff1a<\/p>\n
struct proc_dir_entry *proc_symlink(const char *name, struct proc_dir_entry *parent, const char *dest);<\/pre>\n
name\u53c2\u6570\u4e3a\u8981\u521b\u5efa\u7684\u7b26\u53f7\u94fe\u63a5\u6587\u4ef6\u540d\uff1bparent\u4e3a\u8be5\u7b26\u53f7\u94fe\u63a5\u6587\u4ef6\u7684\u7236\u76ee\u5f55\uff1bdest\u4e3a\u7b26\u53f7\u94fe\u63a5\u6240\u6307\u5411\u7684\u76ee\u6807\u6587\u4ef6\u3002<\/p>\n
\u4e0b\u9762\u7684\u4ee3\u7801\u6f14\u793a\u4e86\u5982\u4f55\u901a\u8fc7\u8be5\u51fd\u6570\u6765\u5bf9\u5df2\u5b58\u5728\u7684\u865a\u62df\u6587\u4ef6jiffies\u521b\u5efa\u7b26\u53f7\u94fe\u63a5\u6587\u4ef6jiffies_too\uff1a<\/p>\n
\tsymlink = proc_symlink(\"jiffies_too\", example_dir, \"jiffies\");\r\n\tif (symlink == NULL) {\r\n\t\trv = -ENOMEM;\r\n\t\tgoto no_symlink;\r\n\t}<\/pre>\n
\u6211\u4eec\u5185\u6838\u6a21\u5757\u52a0\u8f7d\u51fd\u6570\u4e2d\u5b8c\u6210\u4e0a\u8ff0\u51e0\u4e2a\u865a\u62df\u6587\u4ef6\u7684\u521b\u5efa\u5de5\u4f5c\u3002<\/p>\n
2.4.\u5220\u9664\u6587\u4ef6\u6216\u76ee\u5f55<\/h5>\n
\u65e2\u7136\u6709\u521b\u5efa\u865a\u62df\u6587\u4ef6\u7684\u51fd\u6570\uff0c\u5fc5\u7136\u4e5f\u5c31\u6709\u5220\u9664\u865a\u62df\u6587\u4ef6\u7684\u51fd\u6570\u63a5\u53e3\uff1a<\/p>\n
void remove_proc_entry(const char *name, struct proc_dir_entry *parent);<\/pre>\n
\u8be5\u51fd\u6570\u4e2d\u7684\u53c2\u6570name\u548cparent\u4e0e\u4e0a\u8ff0\u51fd\u6570\u7684\u53c2\u6570\u610f\u4e49\u76f8\u540c\u3002
\n\u5728\u793a\u4f8b\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u5728\u5378\u8f7d\u51fd\u6570\u4e2d\u5b8c\u6210\u4e0a\u8ff0\u51e0\u4e2a\u6587\u4ef6\u7684\u5220\u9664\u5de5\u4f5c\uff1a<\/p>\n
\tremove_proc_entry(\"jiffies_too\", example_dir);\r\n\tremove_proc_entry(\"foo\", example_dir);\r\n\tremove_proc_entry(\"MODULE_NAME\", NULL);<\/pre>\n
2.5\u8bfb\u5199proc\u6587\u4ef6<\/h5>\n
\u5982\u679c\u53ea\u662f\u521b\u5efa\u4e86\u865a\u62df\u6587\u4ef6\uff0c\u90a3\u4e48\u5b83\u5e76\u4e0d\u80fd\u88ab\u8bfb\u5199\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u5fc5\u987b\u4e3a\u6bcf\u4e2a\u865a\u62df\u6587\u4ef6\u6302\u63a5\u8bfb\u5199\u51fd\u6570\uff0c\u5982\u679c\u8be5\u865a\u62df\u6587\u4ef6\u662f\u53ea\u8bfb\u7684\uff0c\u90a3\u4e48\u53ea\u9700\u6302\u8f7d\u76f8\u5e94\u7684\u8bfb\u51fd\u6570\u3002<\/p>\n
\u6b63\u5982\u4e0a\u9762\u6240\u8ff0\uff0c\u6bcf\u4e2a\u865a\u62df\u6587\u4ef6\u5bf9\u5e94\u7684proc_dir_entry\u7ed3\u6784\u90fd\u6709read_proc\u548cwrite_proc\u4e24\u4e2a\u5b57\u6bb5\uff0c\u5b83\u4eec\u5747\u4e3a\u51fd\u6570\u6307\u9488\uff0c\u5176\u5404\u81ea\u7684\u7c7b\u578b\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n
 typedef int (read_proc_t)(char *page, char **start, off_t off, int count, int *eof, void *data);\r\n  typedef int (write_proc_t)(struct file *file, const char __user *buffer, unsigned long count, void *data);<\/pre>\n
\u5982\u679c\u8981\u5b9e\u73b0\u5bf9\u865a\u62df\u6587\u4ef6\u7684\u8bfb\u5199\uff0c\u5219\u9700\u8981\u5b9e\u73b0\u4e0a\u8ff0\u4e24\u4e2a\u51fd\u6570\u63a5\u53e3\u3002\u5bf9\u4e8e\u6211\u4eec\u7684\u793a\u4f8b\u7a0b\u5e8f\uff0c\u6211\u4eec\u7684\u5b9e\u73b0\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
static int proc_read_foobar(char *page, char **start, off_t off, int count, int *eof, void *data)\r\n{\r\n\tint len;\r\n\tstruct fb_data_t *fb_data = (struct fb_data_t *)data;\r\n\r\n\t\/\/\u5c06fb_data\u7684\u6570\u636e\u5199\u5165page\r\n\tlen = sprintf(page, \"%s = %s\\n\", fb_data->name, fb_data->value);\r\n\r\n\treturn len;\r\n}\r\n\r\nstatic int proc_write_foobar(struct file *file, const char *buffer, unsigned long count, void *data)\r\n{\r\n\tint len;\r\n\tstruct fb_data_t *fb_data = (struct fb_data_t *)data;\r\n\r\n\tif (count > FOOBAR_LEN)\r\n\t\tlen = FOOBAR_LEN;\r\n\telse\r\n\t\tlen = count;\r\n\r\n\t\/\/\u5199\u51fd\u6570\u7684\u6838\u5fc3\u8bed\u53e5\uff0c\u5c06\u7528\u6237\u6001\u7684buffer\u5199\u5165\u5185\u6838\u6001\u7684value\u4e2d\r\n\tif (copy_from_user(fb_data->value, buffer, len))\r\n\t\treturn -EFAULT;\r\n\r\n\tfb_data->value[len] = '\\0';\r\n\r\n\treturn len;\r\n}<\/pre>\n
\u5f53\u7528\u6237\u8bfb\u6211\u4eec\u521a\u521b\u5efa\u7684\u865a\u62df\u6587\u4ef6\u65f6\uff0c\u8be5\u6587\u4ef6\u5bf9\u5e94\u7684read_proc\u51fd\u6570\u5c06\u88ab\u8c03\u7528\u3002\u8be5\u51fd\u6570\u5c06\u6570\u636e\u5199\u5165\u5185\u6838\u7684\u7f13\u51b2\u533a\u4e2d\u3002\u4e0a\u8ff0\u8bfb\u51fd\u6570\u7684\u4f8b\u5b50\u4e2d\uff0c\u7f13\u51b2\u533a\u5373\u4e3apage\u3002\u5f53\u7528\u6237\u7ed9\u865a\u62df\u6587\u4ef6\u5199\u6570\u636e\u65f6\uff0cwrite_proc\u51fd\u6570\u5c06\u88ab\u8c03\u7528\uff0c\u8be5\u51fd\u6570\u4ece\u7f13\u51b2\u533abuffer\u4e2d\u8bfb\u53d6count\u4e2a\u5b57\u8282\u7684\u6570\u636e\u3002<\/p>\n
3.\u6d4b\u8bd5<\/h4>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u8fdb\u884c\u4e00\u7cfb\u5217\u7684\u8bfb\u5199\u6d4b\u8bd5\u3002\u7531\u4e8e\u6211\u4eec\u53ea\u4e3ajiffies\u4e0e\u5176\u7b26\u53f7\u94fe\u63a5\u6587\u4ef6jiffies_too\u5b9e\u73b0\u4e86\u8bfb\u56de\u8c03\u51fd\u6570\uff0c\u56e0\u6b64\u5b83\u4eec\u4e3a\u53ea\u8bfb\u6587\u4ef6\uff0c\u5f53\u5bf9\u8fd9\u4e24\u4e2a\u6587\u4ef6\u8fdb\u884c\u5199\u64cd\u4f5c\u65f6\u5c31\u4f1a\u51fa\u73b0\u9519\u8bef\uff1b\u5bf9\u4e8efoo\u548cbar\u6587\u4ef6\uff0c\u6211\u4eec\u4e3a\u5176\u5b9e\u73b0\u4e86\u8bfb\u3001\u5199\u51fd\u6570\uff0c\u56e0\u6b64\u65e2\u53ef\u4ee5\u5bf9\u5b83\u4eec\u8fdb\u884c\u8bfb\u64cd\u4f5c\u4e5f\u53ef\u4ee5\u8fdb\u884c\u5199\u64cd\u4f5c\u3002<\/p>\n
root@edsionte-desktop:\/proc\/edsionte_procfs# cat jiffies\r\njiffies = 833619\r\nroot@edsionte-desktop:\/proc\/edsionte_procfs# cat jiffies_too\r\njiffies = 834442\r\nroot@edsionte-desktop:\/proc\/edsionte_procfs# cat bar\r\nbar = bar\r\nroot@edsionte-desktop:\/proc\/edsionte_procfs# cat foo\r\nfoo = foo\r\nroot@edsionte-desktop:\/proc\/edsionte_procfs# echo \"time\" > jiffies\r\nbash: echo: \u5199\u64cd\u4f5c\u51fa\u9519: \u8f93\u5165\/\u8f93\u51fa\u9519\u8bef\r\nroot@edsionte-desktop:\/proc\/edsionte_procfs# echo \"time\" > jiffies_too\r\nbash: echo: \u5199\u64cd\u4f5c\u51fa\u9519: \u8f93\u5165\/\u8f93\u51fa\u9519\u8bef\r\nroot@edsionte-desktop:\/proc\/edsionte_procfs# echo \"hello\" >> bar\r\nroot@edsionte-desktop:\/proc\/edsionte_procfs# cat bar\r\nbar = hello<\/pre>\n
\u793a\u4f8b\u7a0b\u5e8f\u53ef\u4ee5\u5728\u6b64<\/a>\u4e0b\u8f7d\u5b8c\u6210\u4ee3\u7801\u3002<\/p>\n
\u53c2\u8003\uff1a<\/strong><\/em><\/p>\n
1.\u8fb9\u5e72\u8fb9\u5b66-Linux\u5185\u6838\u6307\u5bfc\uff1b\u4f5c\u8005: \u674e\u5584\u5e73\uff1b\u51fa\u7248\u793e: \u6d59\u6c5f\u5927\u5b66\u51fa\u7248\u793e\uff1b<\/strong><\/em><\/p>\n
2.\u4f7f\u7528 \/proc \u6587\u4ef6\u7cfb\u7edf\u6765\u8bbf\u95ee Linux \u5185\u6838\u7684\u5185\u5bb9\uff1b<\/strong><\/em>
\n http:\/\/www.ibm.com\/developerworks\/cn\/linux\/l-proc.html<\/a><\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"
\u672c\u535a\u5ba2\u4e4b\u524d\u7684\u6587\u7ae0\u4e2d\u591a\u6b21\u6d89\u53ca\u5230\/proc\u6587\u4ef6\u7cfb\u7edf\uff0c\u4e0b\u9762\u7684\u51e0\u6761\u547d\u4ee4\u90fd\u5728\u66fe\u7ecf\u7684\u6587\u7ae0\u4e2d\u51fa\u73b0\u8fc7\uff1a cat \/proc\/i […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[226,227,147],"class_list":["post-3030","post","type-post","status-publish","format-standard","hentry","category-linux","tag-proc","tag-227","tag-147"],"views":17682,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/3030","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=3030"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/3030\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=3030"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=3030"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=3030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}