struct stat
{
dev_t st_dev;
ino_t st_ino;
int st_mode;
int st_nlink;
int st_uid;
int st_gid;
dev_t st_rdev;
off_t st_size;
time_t st_atime;
time_t st_mtime;
time_t st_ctime;
};
#define S_IFMT 0170000
#define S_IFDIR 0040000
#define S_IFCHR 0020000
#define S_IFBLK 0060000
#define S_IFREG 0100000
#define S_ISUID 0004000
#define S_ISGID 0002000
#define S_ISVTX 0001000
#define S_IREAD 0000400
#define S_IWRITE 0000200
#define S_IEXEC 0000100