# getuid(2)

    NAME
         getuid, geteuid - get user identity

    SYNOPSIS
         #include <sys/types.h>
         #include <unistd.h>

         uid_t getuid(void)
         uid_t geteuid(void)

    DESCRIPTION
         Getuid returns the real user ID  of  the  current  process,  geteuid  the
         effective user ID.

         The real user ID identifies the person who is logged in.   The  effective
         user  ID  gives  the  process  additional permissions during execution of
         "set-user-ID" mode processes, which use getuid  to  determine  the  real-
         user-id of the process that invoked them.

    SEE ALSO
         getgid(2), setuid(2).