Pointer Length: the distance the beam will project before stopping.
(指针光束长度)：在停止前光束投射的距离。
The pointer should be moved adequately depending on the length of socket address as populated in the structure after the call.
根据调用之后该结构中填充的套接字地址的长度，可以对这个指针进行移动。
This error occurs if a program passes an invalid pointer value or if the length of the buffer is too small.
如果程序传递了无效的指针值，或者如果缓冲区的长度太小会发生此错误。
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