通过调用prctl(2)设置PR_SET _ KEEPCAPS，这请求系统在调用setuid(2)时保留它的能力。
Call PRCTL (2) to set PR_SET_KEEPCAPS, which asks the system to let it keep its capabilities across setuid (2).
现在仍使用XP的用户不会像那些Vista的用户去做那种“原状态升级”，这种“原状态升级”仅仅是让新的操作系统覆盖掉旧的系统，依旧保留着他们之前安装着的软件，原有的设置与数据。
Unlike Vista users, they can't do an "in-place upgrade," in which the new OS overwrites the old one, preserving their installed applications, preferences, and data.
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