1、stat fstat lstat
#include <sys/stat.h>
int stat(const char * restrict pathname,struct stat *restrict buf);
int fstat(int filedes,struct stat *buf);
int lstat(const char *restrict pathname,struct stat *restrict buf);
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 */
};
2、文件类型
文件类型定义在stat结构的st_mode成员中，宏确定文件类型，这些宏的参数都是stat结构中的st_mode成员
S_ISREG(m) is it a regular file?
S_ISDIR(m) directory?
S_ISCHR(m) character device?
S_ISBLK(m) block device?
S_ISFIFO(m) FIFO (named pipe)?
S_ISLNK(m) symbolic link? (Not in POSIX.1-1996.)
S_ISSOCK(m) socket? (Not in POSIX.1-1996.)
3、chmod fchmod
4、chown、fchown、lchown
5、文件长度
stat结构成员st_size 表示以字节为单位的文件长度
6、文件截短
#include <unistd.h>
int truncate(const char *pathname,off_t length);
7、link、unlink、remove、rename