#include <sys/types.h>

 #include <utime.h>

 int utime(const char * filename, struct utimbuf * buf);

 结构体 utimbuf 定义如下

 struct utimbuf{

     time_t actime;　　//访问时间

     time_t modtime;　　//修改时间

 };

 #include <time.h>

 #include <sys/types.h>

 #include <utime.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <errno.h>

 #include <sys/stat.h>

 #include <fcntl.h>

 #include <string.h>

 #include <unistd.h>

 #include <memory.h>

 // ctime 函数 将事件转换成字符串输出

 void out(struct stat buff)

 {

     time_t val_atime = (time_t)buff.st_atime;

     time_t val_mtime = (time_t)buff.st_mtime;

     time_t val_ctime = (time_t)buff.st_ctime;

     printf("atime: %s\n", ctime(&val_atime));

     printf("mtime: %s\n", ctime(&val_mtime));

     printf("ctime: %s\n", ctime(&val_ctime));

 }

 //获取文件属性信息

 struct stat get_stat(char *file, struct stat buff)

 {

     memset(&buff, , sizeof(buff));

     if(lstat(file, &buff) < ) {

         perror("lstat error");

         exit();

     }

     return buff;

 }

 int main(int argc, char *argv[])

 {

     if(argc < ) {

         fprintf(stderr, "usage:%s file\n", argv[]);

         exit();

     }

     struct stat buff;

     buff = get_stat(argv[], buff);

     //备份原先的时间

     struct stat bak_stat = buff;

     out(buff);

     printf("=============================\n");

     //设置文件的事件为当前系统时间

     utime(argv[], NULL);

     buff = get_stat(argv[], buff);

     out(buff);

     printf("=============================\n");

     //把文件的时间恢复成之前的时间

     struct utimbuf timebuf;

     timebuf.actime = bak_stat.st_atime;

     timebuf.modtime = bak_stat.st_mtime;

     utime(argv[], &timebuf);

     buff = get_stat(argv[], buff);

     out(buff);

     return ;

 }