FE_HAS_SIGNAL
status |= FE_HAS_SIGNAL;
status |= FE_HAS_SIGNAL;
status = FE_HAS_VITERBI | FE_HAS_CARRIER | FE_HAS_SIGNAL;
festatus |= FE_HAS_SIGNAL;
status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
festatus |= FE_HAS_SIGNAL;
fs |= FE_HAS_SIGNAL;