Linux system programming files and I/O (iv) file properties

First, read file meta data

int stat (const char *path, struct stat *buf);

int fstat (int fd, struct stat *buf);

int Lstat (const char *path, struct stat *buf);

Stat () Stats The file pointed to by path and fills in BUF.

Lstat () is identical to stat (), except this if path is a symbolic link, then the link itself be stat-ed, not the file th At it refers to.

Fstat () is identical to stat (), except which the file to being stat-ed is specified by the file descriptor FD.

Second, stat structural body

struct STAT {

dev_t St_dev; /* ID of device containing file */

ino_t St_ino; /* Inode Number * *

mode_t St_mode; * Protection * *

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; /* blocksize for file system I/O

blkcnt_t st_blocks; /* Number of 512B blocks allocated * *

time_t St_atime; /* Time of last access */

time_t St_mtime; /* Time of last modification * *

time_t St_ctime; /* Time of last status change * *

};