getuid, geteuid - get user identification
Standard C Library (libc, -lc)
The getuid() function returns the real user ID of the calling process.
The geteuid() 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 ``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.
The geteuid() and getuid() functions conform to ISO/IEC 9945-1:1990
BSD June 4, 1993 BSD
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