accurate serial timestamp

["Anindha Parthy" <anindha@gmail.com>]

Hello,

I would like to take a high accuracy timestamp whenever data is
received on the serial port.

I think the best place to do this is in the tty_flip_buffer_push
method of the tty_io.c file.

   2652 void tty_flip_buffer_push(struct tty_struct *tty)
   2653 {
   2654     if (tty->low_latency)
   2655         flush_to_ldisc((void *) tty);
   2656     else
   2657         schedule_delayed_work(&tty->flip.work, 1);
   2658 }

I would buffer the timestamps, and access them using an ioctl.

Is this the best way of doing this?

I am currently using the 2.6.15 kernel.

Regards,

Anindha