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The
function returns the real user ID of the calling process. The function
returns the effective user ID of the calling process. The real user ID
is that of the user who has invoked the program. As the effective user ID
gives the process additional permissions during execution of mode processes,
is used to determine the real-user-id of the calling process.
The
and functions are always successful, and no return value is reserved to
indicate an error.
and functions conform to
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