getuid, geteuid - get user identity
These functions are always successful.
POSIX.1-2001, POSIX.1-2008, 4.3BSD.
The original Linux getuid() and geteuid() system calls supported only 16-bit user IDs. Subsequently, Linux 2.4 added getuid32() and geteuid32(), supporting 32-bit IDs. The glibc getuid() and geteuid() wrapper functions transparently deal with the variations across kernel versions.
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