GB_UART_CTRL_DTR
newctrl &= ~(GB_UART_CTRL_DTR | GB_UART_CTRL_RTS);
newctrl |= (GB_UART_CTRL_DTR | GB_UART_CTRL_RTS);
return (gb_tty->ctrlout & GB_UART_CTRL_DTR ? TIOCM_DTR : 0) |
set = (set & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) |
clear = (clear & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) |
newctrl |= (GB_UART_CTRL_DTR | GB_UART_CTRL_RTS);
newctrl &= ~(GB_UART_CTRL_DTR | GB_UART_CTRL_RTS);