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The  IGETER  function  and  the  ICLRER  subroutine  are  included  for
compatibility with previous versions of FORTRAN. Their functionality is
provided in the current version by the IOSTAT = option.
IGETER is called after  an I/O operation  that includes  the  ERR =  or
IOSTAT = option. It returns the following values:
        0            No error occured.
        Negative value    An end-of-file condition occured, but no other
                                                        error occured.
        Positive value    An error occured. The return value is the error
                                                        number.
The IGETER calling interface has the following form:

                INTEGER*2  FUNCTION  IGETER ( IUNIT )
                INTEGER*2  IUNIT
                        .
                        .
                END

ICLRER reset the FORTRAN run-time-error code information after an error
has been encountered  and handled  through  ERR =  and  IOSTAT =  . The
ICLRER calling interface has the following form:

                SUBROUTINE  ICLRER ( IUNIT )
                INTEGER*2   IUNIT
                        .
                        .
                END