> > How do you flush the buffers? Simply reading them out?
>
> Nope. In python I use the flushInput() method of the serial object
> defined by the pyserial library[0]. The method does just this system
> call:
>
> termios.tcflush(self.fd, TERMIOS.TCIFLUSH)
case TCFLSH:
retval = tty_check_change(tty);
if (retval)
return retval;
ld = tty_ldisc_ref(tty);
switch (arg) {
case TCIFLUSH:
if (ld && ld->flush_buffer)
ld->flush_buffer(tty);
break;
case TCIOFLUSH:
if (ld && ld->flush_buffer)
ld->flush_buffer(tty);
/* fall through */
case TCOFLUSH:
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
break;
default:
tty_ldisc_deref(ld);
return -EINVAL;
}
tty_ldisc_deref(ld);
return 0;
Most likely you were using n_tty.
static void n_tty_flush_buffer(struct tty_struct * tty)
{
/* clear everything and unthrottle the driver */
reset_buffer_flags(tty);
if (!tty->link)
return;
if (tty->link->packet) {
tty->ctrl_status |= TIOCPKT_FLUSHREAD;
wake_up_interruptible(&tty->link->read_wait);
}
}
It sets TIOCPKT_FLUSHREAD, which is used nowhere else in the kernel.
And I am confused. Could somebody who has some experience in the
tty layer comment on that?
Regards
Oliver
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