BES_CTS
SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);