grant_privilege(p1) public

Set the effective user ID, and if possible, the saved user ID of the process to the given integer. Returns the new effective user ID. Not available on all platforms.

[Process.uid, Process.euid]          #=> [0, 0]
Process::UID.grant_privilege(31)     #=> 31
[Process.uid, Process.euid]          #=> [0, 31]
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