FreeBSD/Linux Kernel Cross Reference
sys/include/sys/stat.h

     /* The <sys/stat.h> header defines a struct that is used in the stat() and
      * fstat functions.  The information in this struct comes from the i-node of
      * some file.  These calls are the only approved way to inspect i-nodes.
      */
     
     #ifndef _STAT_H
     #define _STAT_H
     
     #ifndef _TYPES_H
    #include <sys/types.h>
    #endif
    
    struct stat {
      dev_t st_dev;                 /* major/minor device number */
      ino_t st_ino;                 /* i-node number */
      mode_t st_mode;               /* file mode, protection bits, etc. */
      short int st_nlink;           /* # links; TEMPORARY HACK: should be nlink_t*/
      uid_t st_uid;                 /* uid of the file's owner */
      short int st_gid;             /* gid; TEMPORARY HACK: should be gid_t */
      dev_t st_rdev;
      off_t st_size;                /* file size */
      time_t st_atime;              /* time of last access */
      time_t st_mtime;              /* time of last data modification */
      time_t st_ctime;              /* time of last file status change */
    };
    
    /* Traditional mask definitions for st_mode. */
    /* The ugly casts on only some of the definitions are to avoid suprising sign
     * extensions such as S_IFREG != (mode_t) S_IFREG when ints are 32 bits.
     */
    #define S_IFMT  ((mode_t) 0170000)      /* type of file */
    #define S_IFLNK ((mode_t) 0120000)      /* symbolic link, not implemented */
    #define S_IFREG ((mode_t) 0100000)      /* regular */
    #define S_IFBLK 0060000         /* block special */
    #define S_IFDIR 0040000         /* directory */
    #define S_IFCHR 0020000         /* character special */
    #define S_IFIFO 0010000         /* this is a FIFO */
    #define S_ISUID 0004000         /* set user id on execution */
    #define S_ISGID 0002000         /* set group id on execution */
                                    /* next is reserved for future use */
    #define S_ISVTX   01000         /* save swapped text even after use */
    
    /* POSIX masks for st_mode. */
    #define S_IRWXU   00700         /* owner:  rwx------ */
    #define S_IRUSR   00400         /* owner:  r-------- */
    #define S_IWUSR   00200         /* owner:  -w------- */
    #define S_IXUSR   00100         /* owner:  --x------ */
    
    #define S_IRWXG   00070         /* group:  ---rwx--- */
    #define S_IRGRP   00040         /* group:  ---r----- */
    #define S_IWGRP   00020         /* group:  ----w---- */
    #define S_IXGRP   00010         /* group:  -----x--- */
    
    #define S_IRWXO   00007         /* others: ------rwx */
    #define S_IROTH   00004         /* others: ------r-- */ 
    #define S_IWOTH   00002         /* others: -------w- */
    #define S_IXOTH   00001         /* others: --------x */
    
    /* The following macros test st_mode (from POSIX Sec. 5.6.1.1). */
    #define S_ISREG(m)      (((m) & S_IFMT) == S_IFREG)     /* is a reg file */
    #define S_ISDIR(m)      (((m) & S_IFMT) == S_IFDIR)     /* is a directory */
    #define S_ISCHR(m)      (((m) & S_IFMT) == S_IFCHR)     /* is a char spec */
    #define S_ISBLK(m)      (((m) & S_IFMT) == S_IFBLK)     /* is a block spec */
    #define S_ISFIFO(m)     (((m) & S_IFMT) == S_IFIFO)     /* is a pipe/FIFO */
    #define S_ISLNK(m)      (((m) & S_IFMT) == S_IFLNK)     /* is a sym link */
    
    /* Function Prototypes. */
    _PROTOTYPE( int chmod, (const char *_path, _mnx_Mode_t _mode)           );
    _PROTOTYPE( int fstat, (int _fildes, struct stat *_buf)                 );
    _PROTOTYPE( int mkdir, (const char *_path, _mnx_Mode_t _mode)           );
    _PROTOTYPE( int mkfifo, (const char *_path, _mnx_Mode_t _mode)          );
    _PROTOTYPE( int stat, (const char *_path, struct stat *_buf)            );
    _PROTOTYPE( mode_t umask, (_mnx_Mode_t _cmask)                          );
    
    /* Open Group Base Specifications Issue 6 (not complete) */
    _PROTOTYPE( int lstat, (const char *_path, struct stat *_buf)           );
    
    #endif /* _STAT_H */

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