linux之unlink函数解析

[lingyun@localhost unlink]$ cat unlink.c 
/*********************************************************************************

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

 *                  All rights reserved.

 *

 *       Filename:  unlink.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 10:37:14 AM"

 *                 

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

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

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

 *  Description:

 *   Input Args:

 *  Output Args:

 * Return Value:

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

int main (void)

{

    if(open("tempfile", O_RDWR) < 0)

    {

        perror("open");

        exit(1);

    }

    if(unlink("tempfile") < 0)

    {

        perror("unlink");

        exit(1);

    }

printf("file unlinked\n");

    sleep(15);

    printf("done\n");

    exit(0);

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

[lingyun@localhost unlink]$ gcc unlink.c 

[lingyun@localhost unlink]$ touch tempfile

[lingyun@localhost unlink]$ ./a.out &

[1] 30273

[lingyun@localhost unlink]$ file unlinked

[lingyun@localhost unlink]$ ls tempfile

ls: cannot access tempfile: No such file or directory

[lingyun@localhost unlink]$ done

[1]+  Done                    ./a.out

[lingyun@localhost unlink]$