rewinddir.c

它通过提供glibc兼容使得应用程序移植到较小的c 库时相当得容易. 它能够应用到带虚拟存储的Linux和uClinux上.在大多数带MMU部件的平台上为使它更加紧凑,它也能够编译成共享库.uClib

#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include "dirstream.h"


/* rewinddir() just does an lseek(fd,0,0) - see close for comments */
void rewinddir(DIR * dir)
{
	if (!dir) {
		__set_errno(EBADF);
		return;
	}
#ifdef __UCLIBC_HAS_THREADS__
	pthread_mutex_lock(&(dir->dd_lock));
#endif
	lseek(dir->dd_fd, 0, SEEK_SET);
	dir->dd_nextoff = dir->dd_nextloc = dir->dd_size = 0;
#ifdef __UCLIBC_HAS_THREADS__
	pthread_mutex_unlock(&(dir->dd_lock));
#endif
}