в чпуксе, если у девайса есть какая-нибудь дополнительная сигнализация (например, если имеем x.25), можно получать sigurg при появлении out-of-band data.
TIOCSPGRP int *tpgrp
Associate the terminal with the process group (as an integer)
pointed to by tpgrp. This is the underlying call that imple-
ments the termios(4) tcsetattr() call.
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seek the sigvector()
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TIOCSPGRP int *tpgrp Associate the terminal with the process group (as an integer) pointed to by tpgrp. This is the underlying call that imple- ments the termios(4) tcsetattr() call.?