# File daybook/mycgi/daybook/base/daybook_mod.rb, line 36
  def m_write_file(path_file, str)
    begin
      File.open(path_file, File::WRONLY | File::CREAT){|w|
      w.flock(File::LOCK_EX)
      w.print str
      }
    rescue SystemCallError
      $stderr.print "IO failes: " + $!
      raise
    end
  end