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FreeBSD 11.0 - man page for geteuid (freebsd section 2)

GETUID(2)						      BSD System Calls Manual							 GETUID(2)

NAME
getuid, geteuid -- get user identification
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void);
DESCRIPTION
The getuid() system call returns the real user ID of the calling process. The geteuid() system call 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.
ERRORS
The getuid() and geteuid() system calls are always successful, and no return value is reserved to indicate an error.
SEE ALSO
getgid(2), issetugid(2), setgid(2), setreuid(2), setuid(2)
STANDARDS
The geteuid() and getuid() system calls are expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1'').
HISTORY
The getuid() and geteuid() functions appeared in Version 7 AT&T UNIX.
BSD
June 4, 1993 BSD