getuid, geteuid - get user identity
getuid returns the real user ID of the current process.
geteuid returns the effective user ID of the current process.
The real ID corresponds to the ID of the calling process. The effective
ID corresponds to the set ID bit on the file being executed.
These functions are always successful.
POSIX, BSD 4.3.
Linux 0.99.11 1993-07-23 GETUID(2)
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