If a process switches its real, effective, or saved uids from at least one being 0 to all being non-zero, then both the permitted and effective capabilities are cleared.
如果进程将它的真实、有效或保存的uid从至少一个0切换到全部非0，那么允许能力集和有效能力集都被清空。
For others (normal non-real-time processes), it is zero.
对于其他的(普通的非实时进程)，它为零。
A real-world voltage source has a very low, but non-zero output impedance: often much less than 1 ohm.
一个真正的世界电压源具 有非常低的，但不为零输出阻抗：通常远小于1 欧姆。
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