LinuxSP - Files and Directories: 개념

struct stat

/usr/include/x86_64-linux-gnu/bits/struct_stat.h

struct stat
  {
#ifdef __USE_TIME_BITS64
# include <bits/struct_stat_time64_helper.h>
#else
    __dev_t st_dev;		/* Device.  */
# ifndef __x86_64__
    unsigned short int __pad1;
# endif
# if defined __x86_64__ || !defined __USE_FILE_OFFSET64
    __ino_t st_ino;		/* File serial number.	*/
# else
    __ino_t __st_ino;			/* 32bit file serial number.	*/
# endif
# ifndef __x86_64__
    __mode_t st_mode;			/* File mode.  */
    __nlink_t st_nlink;			/* Link count.  */
# else
    __nlink_t st_nlink;		/* Link count.  */
    __mode_t st_mode;		/* File mode.  */
# endif
    __uid_t st_uid;		/* User ID of the file's owner.	*/
    __gid_t st_gid;		/* Group ID of the file's group.*/
# ifdef __x86_64__
    int __pad0;
# endif
    __dev_t st_rdev;		/* Device number, if device.  */
# ifndef __x86_64__
    unsigned short int __pad2;
# endif
# if defined __x86_64__ || !defined __USE_FILE_OFFSET64
    __off_t st_size;			/* Size of file, in bytes.  */
# else
    __off64_t st_size;			/* Size of file, in bytes.  */
# endif
    __blksize_t st_blksize;	/* Optimal block size for I/O.  */
# if defined __x86_64__  || !defined __USE_FILE_OFFSET64
    __blkcnt_t st_blocks;		/* Number 512-byte blocks allocated. */
# else
    __blkcnt64_t st_blocks;		/* Number 512-byte blocks allocated. */
# endif
# ifdef __USE_XOPEN2K8
    /* Nanosecond resolution timestamps are stored in a format
       equivalent to 'struct timespec'.  This is the type used
       whenever possible but the Unix namespace rules do not allow the
       identifier 'timespec' to appear in the <sys/stat.h> header.
       Therefore we have to handle the use of this header in strictly
       standard-compliant sources special.  */
    struct timespec st_atim;		/* Time of last access.  */
    struct timespec st_mtim;		/* Time of last modification.  */
    struct timespec st_ctim;		/* Time of last status change.  */
#  define st_atime st_atim.tv_sec	/* Backward compatibility.  */
#  define st_mtime st_mtim.tv_sec
#  define st_ctime st_ctim.tv_sec
# else
    __time_t st_atime;			/* Time of last access.  */
    __syscall_ulong_t st_atimensec;	/* Nscecs of last access.  */
    __time_t st_mtime;			/* Time of last modification.  */
    __syscall_ulong_t st_mtimensec;	/* Nsecs of last modification.  */
    __time_t st_ctime;			/* Time of last status change.  */
    __syscall_ulong_t st_ctimensec;	/* Nsecs of last status change.  */
# endif
# ifdef __x86_64__
    __syscall_slong_t __glibc_reserved[3];
# else
#  ifndef __USE_FILE_OFFSET64
    unsigned long int __glibc_reserved4;
    unsigned long int __glibc_reserved5;
#  else
    __ino64_t st_ino;			/* File serial number.	*/
#  endif
# endif
#endif /* __USE_TIME_BITS64  */
  };

struct stat {
       dev_t      st_dev;      /* ID of device containing file */
       ino_t      st_ino;      /* Inode number */
       mode_t     st_mode;     /* File type and mode */
       nlink_t    st_nlink;    /* Number of hard links */
       uid_t      st_uid;      /* User ID of owner */
       gid_t      st_gid;      /* Group ID of owner */
       dev_t      st_rdev;     /* Device ID (if special file) */
       off_t      st_size;     /* Total size, in bytes */
       blksize_t  st_blksize;  /* Block size for filesystem I/O */
       blkcnt_t   st_blocks;   /* Number of 512 B blocks allocated */

       /* Since POSIX.1-2008, this structure supports nanosecond
       precision for the following timestamp fields.
       For the details before POSIX.1-2008, see VERSIONS. */

       struct timespec  st_atim;  /* Time of last access */
       struct timespec  st_mtim;  /* Time of last modification */
       struct timespec  st_ctim;  /* Time of last status change */

#define st_atime  st_atim.tv_sec  /* Backward compatibility */
#define st_mtime  st_mtim.tv_sec
#define st_ctime  st_ctim.tv_sec
};

 

st_mode

파일의 종류 및 권한(mode)를 나타내는 것으로 16비트가 사용된다.

파일의 종류				effective uid/gid sticky bit			파일의 허가권
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

0000 000 000000000