;+
; NAME: def_myuniquetmpdir
;
; PURPOSE: if needed, define and create myuniquetmpdir
;          (common variable from cm_general) and add it to !path
;
; CATEGORY: utilities
;
; CALLING SEQUENCE:def_myuniquetmpdir
;
; COMMON BLOCKS: cm_general
;
; SIDE EFFECTS: see purpose
;
; MODIFICATION HISTORY:Sebastien Masson (smasson@lodyc.jussieu.fr)
;                      June 2005
;
;-
PRO def_myuniquetmpdir
@cm_general
;
 IF n_elements(myuniquetmpdir) EQ 0 THEN BEGIN
; define a new and unique directory in getenv('IDL_TMPDIR') by using systime(1)
; look for the login if we use "unix" system
    IF !d.name EQ 'X' THEN spawn, 'whoami', login, /noshell ELSE login = 'idl'
    myuniquetmpdir = file_search(getenv('IDL_TMPDIR'), /mark_directory)
    myuniquetmpdir = myuniquetmpdir[0] + login[0] + '.' $
                  + strtrim(long(systime(1)), 1) + '/' 
; create it
    file_mkdir, myuniquetmpdir
; add it to !path
    !path = !path+ ':' + expand_path(myuniquetmpdir)
  ENDIF
;

  return
end