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GETUID(2) BSD System Calls Manual GETUID(2)
getuid, geteuid -- get user identification
The getuid() function returns the real user ID of the calling process. The geteuid() func-
tion 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 ``set-user-ID'' mode processes,
getuid() is used to determine the real-user-id of the calling process.
The getuid() and geteuid() functions are always successful, and no return value is reserved
to indicate an error.
Geteuid() and getuid() functions conform to IEEE Std 1003.1-1988 (``POSIX.1'').
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
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