dmark$ (6) --- return the position of a disk file        03/25/82


            _C_a_l_l_i_n_g _I_n_f_o_r_m_a_t_i_o_n

                 file_mark function dmark$ (f)
                 file_des f

                 Library:  vswtlb (standard Subsystem library)


            _F_u_n_c_t_i_o_n

                 'Dmark$'  performs  the  function of 'markf' for disk files.
                 The single argument is the file descriptor of a  disk  file;
                 the  function  return  is the current file pointer value for
                 the selected file.  ERR is returned if the position  of  the
                 file could not be determined.

                 As  with all Subsystem routines whose names contain the dol-
                 lar sign ($), 'dmark$' is  not  intended  for  general  use.
                 'Markf'  is  normally  used  to  provide  the required func-
                 tionality.


            _I_m_p_l_e_m_e_n_t_a_t_i_o_n

                 The Primos routine PRWF$$ is used to return the current file
                 position, which is in units of words past the  beginning  of
                 file.   If  for  any  reason  PRWF$$  cannot  determine  the
                 position, 'dmark$' returns ERR.


            _C_a_l_l_s

                 Primos prwf$$


            _S_e_e _A_l_s_o

                 markf (2), tmark$ (6), seekf (2)




















            dmark$ (6)                    - 1 -                    dmark$ (6)