ttttooppeenn() -- Terminal-Device Routine

#iinncclluuddee <ssyyss/ttttyy.hh>
#iinncclluuddee <ssggttttyy.hh>
vvooiidd
ttttooppeenn(_t_p)
TTTTYY *_t_p;

ttttooppeenn() is  called by  a teletypewriter (tty)  device driver on  the first
open.  It sets up default parameters, and invokes (*_t_p->tt_ppaarraamm)(_t_p)     to
initialize the hardware.

_S_e_e _A_l_s_o
tteerrmmiinnaall-ddeevviiccee rroouuttiinneess
