more device files on same COM?

more device files on same COM?

[Dalibor Kranjcic]

Hi,

I would like to use /dev/ttyS12 as virtual port for COM2, which would
allow sending of additional data flow to COM2 independently from the
data flow which is already sent trough /dev/ttyS1 (let's say ppp).

So, I expect write to /dev/ttyS12 to activate rs_interrupt_single method
which does the actual write. Once I'm in rs_interrupt_single method I
would redirect the incoming user space data to TX lines for COM2.

The write to /dev/ttyS12 fails with EIO Input/Output error, I suppose
because there is no UART defined for this device and some initialization
stuff doesn't go trough.

I'm wondering if there is any way to activate rs_interrupt_single method
in serial.c or for /dev/ttyS12 or in other words is there any way to
have more (virtual) tty device files for the same COM? 


Thanks for any advice...


Dalibor Kranjcic.

RE: more device files on same COM?

[Stuart MacDonald]

From: linux-serial-owner@vger.kernel.org 
> I would like to use /dev/ttyS12 as virtual port for COM2, which would
> allow sending of additional data flow to COM2 independently from the
> data flow which is already sent trough /dev/ttyS1 (let's say ppp).

What's wrong with just opening ttyS1 again (twice)?

..Stu