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Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

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System Functions (s and S) setreuid(2)
• If both the real and effective user IDs are changed so that they differ from each other and
from the saved-set user ID, then the saved-set user ID is set to the value of the effective
user ID.
• A process without appropriate privileges cannot set the real user ID.
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