(20)--3.5 文件IO基本操作四.ppt

文件IO基本操作四 stat( ) 1. stat命令 stat 文件名查看文件属性信息 2. 函数stat()#include sys/types.h#include sys/stat.h#include unistd.h?int stat(const char *path, struct stat *buf);int fstat(int fd, struct stat *buf);int lstat(const char *path, struct stat *buf);（1）函数原型 2. 函数stat()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）struct stat结构体 2. 函数stat()……memset(buf, 0, sizeof(buf));ret = stat(PATHNAME, buf); if (ret 0) { perror(stat error); exit(-1); }printf(inode = %d.\n, buf.st_ino);printf(size = %d bytes.\n, buf.st_size);printf(st_blksize = %d.\n, buf.st_blksize);printf(st_blocks = %d.\n, buf.st_blocks); ……示例1（2）struct stat结构体 2. 函数stat()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）struct stat结构体 2. 函数stat() …… re