fxgclose.pro
2.09 KB
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;+
; NAME:
; FXGCLOSE
;
; AUTHOR:
; Craig B. Markwardt, NASA/GSFC Code 662, Greenbelt, MD 20770
; craigm@lheamail.gsfc.nasa.gov
; UPDATED VERSIONs can be found on my WEB PAGE:
; http://cow.physics.wisc.edu/~craigm/idl/idl.html
;
; PURPOSE:
; Closes a generic resource
;
; MAJOR TOPICS:
; File I/O, Pipes, URLs, FITS
;
; CALLING SEQUENCE:
; FXGCLOSE, UNIT
;
; DESCRIPTION:
;
; FXGCLOSE closes a generic resource originally opened by FXGOPEN.
; All associated system resources are freed.
;
; You must use the specialized 'FXG' style functions to read, write
; and seek on file units opened with FXGOPEN:
;
; FXGOPEN - open resource
; FXGCLOSE - close resource
; FXGREAD - read from resource
; FXGWRITE - write to resource
; FXGSEEK - seek on resource (i.e., perform POINT_LUN)
;
; FXGFILTERED - determine if resource is a normal file.
;
; INPUTS:
;
; UNIT - the unit number of the currently open resource. The unit
; must have been previously opened by FXGOPEN.
;
; MODIFICATION HISTORY:
; Written, 1999, CM
; Documented, 02 Oct 1999, CM
; Changed copyright notice, 21 Sep 2000, CM
;
; $Id: fxgclose.pro,v 1.3 2007/09/01 23:03:23 craigm Exp $
;
;-
; Copyright (C) 1999-2000, Craig Markwardt
; This software is provided as is without any warranty whatsoever.
; Permission to use, copy, modify, and distribute modified or
; unmodified copies is granted, provided this copyright and disclaimer
; are included unchanged.
;-
PRO FXGCLOSE, UNIT
on_error, 2
if n_params() NE 1 then begin
message, 'USAGE: FXGCLOSE, UNIT', /info
return
endif
if n_elements(unit) EQ 0 then $
message, 'ERROR: UNIT is not defined'
@fxfilter
if unit LT 0 OR unit GE FXFILTER_MAX_LUN then $
message, 'ERROR: UNIT is not a valid file unit'
free_lun = 'FREE_LUN'
if filterflag(unit) AND 1 then $
if close_cmd(unit) NE '' then free_lun = close_cmd(unit)
call_procedure, free_lun, unit
FILTERFLAG(UNIT) = 0 ;; Zero out the dispatch entries
SEEK_CMD(UNIT) = ''
READ_CMD(UNIT) = ''
WRITE_CMD(UNIT) = ''
CLOSE_CMD(UNIT) = ''
return
end