This function returns the size of the value buffer on success and 0 if the name specified is not a valid environment variable name.
如果成功，则此函数返回值缓存的大小，如果指定的名称并不是一个合法的环境变量名，则返回0。
An attacker may be able to exploit a buffer overflow by changing the value of other data in the function; none of these approaches counter that.
攻击者也许能够通过改变函数中其他数据的值来利用缓冲区溢出；没有哪种方法能够防止这点。
Is your Buffer Pool specification initialized to a value, and is it too small?
是否为缓冲区池指定了大小，这个值是否太小？
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