: mask
: mask=(mask)
   ͥ٤Υޥޤꤹ롣
   ޥϱ³ŪǤꡢ
   Syslog::open/Syslog#open/Syslog#close
   ǤϥꥻåȤʤ
      :
        sl.mask = Syslog::LOG_UPTO(Syslog::LOG_ERR)

