创建一个 proc 文件根据对 proc 文件的不同使用,内核提供了多种包装函数来创建一个 proc 文件。方法一:struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode, struct proc_dir_entry *parent)这是最直接,包装最少的创建方法。参数 name 是要创建的 proc 文件名。mode 是该文件权限值,例如 S_IRUGO,可传入0表示采用系统默认值。parent 指定该文件的上层 proc 目录项,如果为 NULL,表示创建在 /proc 根目录下。create_proc_entry() 完成的任务主要包括:检测 mode 值,分配 proc_dir_entry 结构,注册 proc_dir_entry。- #define S_IFMT 00170000
-
13#define S_IFSOCK 0140000
-
14#define S_IFLNK 0120000
-
15#define S_IFREG 0100000
-
16#define S_IFBLK 0060000
-
17#define S_IFDIR 0040000
-
18#define S_IFCHR 0020000
-
19#define S_IFIFO 0010000
-
20#define S_ISUID 0004000
-
21#define S_ISGID 0002000
-
22#define S_ISVTX 0001000
-
23
-
24#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
-
25#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
-
26#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
-
27#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
-
28#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
-
29#define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
-
30#define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
-
31
-
32#define S_IRWXU 00700
-
33#define S_IRUSR 00400
-
34#define S_IWUSR 00200
-
35#define S_IXUSR 00100
-
36
-
37#define S_IRWXG 00070
-
38#define S_IRGRP 00040
-
39#define S_IWGRP 00020
-
40#define S_IXGRP 00010
-
41
-
42#define S_IRWXO 00007
-
43#define S_IROTH 00004
-
44#define S_IWOTH 00002
-
45#define S_IXOTH 00001
-
46
-
47#endif
-
48
-
49#ifdef __KERNEL__
-
50#define S_IRWXUGO (S_IRWXU|S_IRWXG|S_IRWXO)
-
51#define S_IALLUGO (S_ISUID|S_ISGID|S_ISVTX|S_IRWXUGO)
-
52#define S_IRUGO (S_IRUSR|S_IRGRP|S_IROTH)
-
53#define S_IWUGO (S_IWUSR|S_IWGRP|S_IWOTH)
-
54#define S_IXUGO (S_IXUSR|S_IXGRP|S_IXOTH)
这里的 S_IRUGO=(S_IRUSR|S_IRGRP|S_IROTH)
S_IRUSR:用户读 00400
S_IRGRP:用户组读 00040
S_IROTH: 其他读 00004
阅读(1223) | 评论(0) | 转发(0) |