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
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13#define S_IFSOCK 0140000
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14#define S_IFLNK 0120000
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15#define S_IFREG 0100000
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16#define S_IFBLK 0060000
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17#define S_IFDIR 0040000
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18#define S_IFCHR 0020000
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19#define S_IFIFO 0010000
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20#define S_ISUID 0004000
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21#define S_ISGID 0002000
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22#define S_ISVTX 0001000
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23
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24#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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25#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
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26#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
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27#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
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28#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
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29#define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
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30#define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
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31
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32#define S_IRWXU 00700
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33#define S_IRUSR 00400
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34#define S_IWUSR 00200
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35#define S_IXUSR 00100
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36
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37#define S_IRWXG 00070
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38#define S_IRGRP 00040
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39#define S_IWGRP 00020
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40#define S_IXGRP 00010
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41
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42#define S_IRWXO 00007
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43#define S_IROTH 00004
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44#define S_IWOTH 00002
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45#define S_IXOTH 00001
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46
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47#endif
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48
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49#ifdef __KERNEL__
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50#define S_IRWXUGO (S_IRWXU|S_IRWXG|S_IRWXO)
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51#define S_IALLUGO (S_ISUID|S_ISGID|S_ISVTX|S_IRWXUGO)
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52#define S_IRUGO (S_IRUSR|S_IRGRP|S_IROTH)
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53#define S_IWUGO (S_IWUSR|S_IWGRP|S_IWOTH)
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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
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