linux之utime函数解析

[lingyun@localhost utime]$ ls
hello  utime.c  world

[lingyun@localhost utime]$ cat utime.c 

/*********************************************************************************

 *      Copyright:  (C) 2013 fulinux<fulinux@sina.com> 

 *                  All rights reserved.

 *

 *       Filename:  utime.c

 *    Description:  This file 

 *                 

 *        Version:  1.0.0(08/04/2013~)

 *         Author:  fulinux <fulinux@sina.com>

 *      ChangeLog:  1, Release initial version on "08/04/2013 05:49:04 PM"

 *                 

 ********************************************************************************/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

#include <utime.h>

#include <sys/stat.h>

/********************************************************************************

 *  Description:

 *   Input Args:

 *  Output Args:

 * Return Value:

 ********************************************************************************/

int main (int argc, char **argv)

{

    int     i, fd;

    struct stat statbuf;

    struct utimbuf timebuf;

for(i = 1; i < argc; i++)

    {

        if(stat(argv[i], &statbuf) < 0)

        {

            printf ("%s: stat error\n", argv[i]);

            continue;

        }

        if((fd = open(argv[i], O_RDWR | O_TRUNC)) < 0)

        {

            printf ("%s: open error\n", argv[i]);

            continue;

        }

        close(fd);

        timebuf.actime  = statbuf.st_atime;

        timebuf.modtime = statbuf.st_mtime;

if(utime(argv[i], &timebuf) < 0)

        {

            printf ("%s: utime error\n", argv[i]);

            continue;

        }

    }

    exit(0);

} /* ----- End of main() ----- */

[lingyun@localhost utime]$ gcc utime.c 

[lingyun@localhost utime]$ ls -l hello world 

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:03 hello

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:04 world

[lingyun@localhost utime]$ ls -lu hello world 

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:03 hello

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:04 world

[lingyun@localhost utime]$ date

Sun Aug  4 18:10:44 CST 2013

[lingyun@localhost utime]$ ./a.out hello world 

[lingyun@localhost utime]$ ls -l hello world 

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:03 hello

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:04 world

[lingyun@localhost utime]$ ls -lu hello world 

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:03 hello

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:04 world

[lingyun@localhost utime]$ ls -lc hello world 

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:10 hello

-rw-r--r-- 1 lingyun trainning 0 Aug  4 18:10 world

[lingyun@localhost utime]$