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

NAME
     getuid, geteuid -- get user identification

SYNOPSIS
     #include <&lt;unistd.h>&gt;

     uid_t
     getuid(void);

     uid_t
     geteuid(void);

DESCRIPTION
     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 execu-
     tion of ``set-user-ID'' mode processes, getuid() is used to determine the
     real user ID of the calling process.

ERRORS
     The getuid() and geteuid() functions are always successful, and no return
     value is reserved to indicate an error.

SEE ALSO
     getgid(2), getresuid(2), setreuid(2), setuid(2)

STANDARDS
     The getuid() and geteuid() functions conform to IEEE Std 1003.1-2008
     (``POSIX.1'').

HISTORY
     The getuid() system call first appeared in Version 1 AT&T UNIX, and
     geteuid() in Version 7 AT&T UNIX.

BSD                              May 28, 2017                              BSD