定义：

void rewinddir(DIR *dir);

表头文件：

#include<sys/types.h>
#include<dirent.h>

说明：

rewinddir()用来设置参数dir 目录流目前的读取位置为原来开头的读取位置。

相关函数：

open, opendir, closedir, telldir, seekdir, readdir, scandir

错误代码：

EBADF dir为无效的目录流

示例：

#include<sys/types.h>
#include<dirent.h>
#include<unistd.h>
main()
{
	DIR * dir;
	struct dirent *ptr;
	dir = opendir("/etc/rc.d");
	while((ptr = readdir(dir))!=NULL)
	{
		printf("d_name :%s\n",ptr->d_name);
	}
	rewinddir(dir);
	printf("readdir again!\n");
	while((ptr = readdir(dir))!=NULL)
	{
		printf("d_name: %s\n",ptr->d_name);
	}
	closedir(dir);
}

执行：

d_name:.
d_name:..
d_name:init.d
d_name:rc0.d
d_name:rc1.d
d_name:rc2.d
d_name:rc3.d
d_name:rc4.d
d_name:rc5.d
d_name:rc6.d
d_name:rc
d_name:rc.local
d_name:rc.sysinit
readdir again!
d_name:.
d_name:..
d_name:init.d
d_name:rc0.d
d_name:rc1.d
d_name:rc2.d
d_name:rc3.d
d_name:rc4.d
d_name:rc5.d
d_name:rc6.d
d_name:rc
d_name:rc.local
d_name:rc.sysinit