send data to serial port from kernel code

[Jerry Toung]

Because all my IP traffic is directed to kernel module I wrote. It appends 
some headers after the IP header and when it's done with the specific 
processing, the packet can now be sent.
At that point I used to make a call to the ethernet output routine 
(*ifp->if_start)() and all is well.

Today I have a new requirement. I need to send those packets to the first 
serial port from the kernel module. 

Still looking for inputs.
Thank you

On Tuesday 08 March 2005 02:26 pm, Stephan Uphoff wrote:
> On Tue, 2005-03-08 at 17:04, Jerry Toung wrote:
> > Good afternoon list,
> > I am looking for a way to write data to the serial interface (/dev/cuaa0)
> > from a kernel module and also read /dev/ttyd0 still from that same kernel
> > module. Any pointers to doing that will be great.
> >
> > I want on exchange IP traffic from FreeBSD to another host with different
> > OS via serial cable (null modem). So instead of making a call the NIC
> > driver, I want to use the serial port as may physical layer.
> > Any other ideas for doing this is welcome as well.
> >
> > I know the basics of serial programming from a regular C application:
> >
> > #include <termios.h>
> >
> > fd = open("/dev/cuaa0", O_RDWR|O_NDELAY)
> > tcsetattr and tcgetattr
> > etc etc.
> >
> >
> > but that's not what I am looking for.
> >
> > Thank you.
> > Jerry
>
> What is wrong with just using PPP ?
>
> Stephan

-- 

---------------------------------------------------
Jerry Toung
Network Software Engineer, AMTI
NASA Ames Research Center
mail stop: 258-6
Moffett Field, CA 94035
tel: 650-604-1310
---------------------------------------------------