ƥץե뤿Υ饹Ǥ

 * ƥݥեޤե "w+" ⡼ɤ 
   "basename.pid.n" Ȥ̾ˤʤޤ
 * Tempfile ֥Ȥ IO ֥ȤƱ褦˻ȤȤǤޤ
 * tmpfile.close(true) ˤꡢƥݥեϺޤ
 * ץȤλȤˤޤ
 * Tempfile#open ˤꡢƥݥեƥץ󤹤뤳ȤǤޤ
 * ƥݥեΥ⡼ɤ 0600 Ǥ