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     GETUID(2)                                               GETUID(2)

     NAME
          getuid, getgid, geteuid, getegid - get user and group
          identity

     SYNOPSIS
          getuid( )

          geteuid( )

          getgid( )

          getegid( )

     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, in contradistinction to the
          effective user ID, which determines his access permission at
          the moment.  It is thus useful to programs which operate
          using the `set user ID' mode, to find out who invoked them.

          Getgid returns the real group ID, getegid the effective
          group ID.

     SEE ALSO
          setuid(2)

     ASSEMBLER
          (getuid = 24.)
          sys getuid
          (real user ID in r0, effective user ID in r1)

          (getgid = 47.)
          sys getgid
          (real group ID in r0, effective group ID in r1)