c++ 調用rename 報錯 Invalid cross-device link error

原因是rename 方法無法在mount 點使用。
oldpath and newpath are not on the same mounted filesystem.  (Linux permits a filesystem to be mounted at multiple
          points, but rename() does not work across different mount points, even if the same filesystem is mounted on both.)


一般是使用拷貝，然后刪除源文件方法解決。