正常的系统审计也可以帮助提炼安装新机器时所使用的安全策略，因为它有助于关闭关于实际使用的子系统的反馈循环。

Regular system auditing will also help refine the security policy used for new machine installations as it helps close the feedback loop on what subsystems are actually in use.

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shutdown - 在正常的关闭处理时由服务器运行时来调用。

shutdown - called by the server run time during normal shutdown processing.

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使用fclose时，即使文件处理未正常关闭，也不会执行什么操作，因此通常不必检查fclose的返回值。

With fclose, there is little to do if the file handle does not close properly, so checking the return value for fclose is generally unnecessary.

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