получение и установка атрибутов терминала, управление линией, получение и установка скорости передачи данных (get and set terminal attributes, line control, get and set baud rate)
Примечание (Note)
UNIX V7 and several later systems have a list of baud rates where
after the values B0 through B9600 one finds the two constants
EXTA, EXTB ("External A" and "External B"). Many systems extend
the list with much higher baud rates.
The effect of a nonzero duration with tcsendbreak() varies.
SunOS specifies a break of duration * N seconds, where N is at
least 0.25, and not more than 0.5. Linux, AIX, DU, Tru64 send a
break of duration milliseconds. FreeBSD and NetBSD and HP-UX and
MacOS ignore the value of duration. Under Solaris and UnixWare,
tcsendbreak() with nonzero duration behaves like tcdrain().
