CONTROL_DTR
control |= CONTROL_DTR;
control &= ~CONTROL_DTR;
result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
priv->line_control = CONTROL_DTR | CONTROL_RTS;
result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
priv->line_control |= CONTROL_DTR;
priv->line_control &= ~CONTROL_DTR;
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
priv->line_control = (CONTROL_DTR | CONTROL_RTS);
priv->line_control |= CONTROL_DTR;
priv->line_control &= ~CONTROL_DTR;
result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);