您可以使用以下机制来定义PC驱动器和CIFS文件共享之间的映射，或者取消映射。

You can use the following mechanisms to define or undefine mappings between PC drives and CIFS file shares.

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release是在对一个打开文件没有其他引用时调用的——此时所有的文件描述符都会被关闭，所有的内存映射都会被取消。

Release is called when there are no more references to an open file — all file descriptors are closed and all memory mappings are unmapped.

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POSIX为创建、映射、同步和取消共享内存段提供五个入口点。

POSIX provides five entry points to create, map, synchronize, and undo Shared memory segments.

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