no ioctls for serial ports? [was Re: LANANA: To Pending Device Number Registrants]

[Pavel Machek]

Hi!

> > > They might also be exactly the same channel, except with certain magic
> > > bits set. The example peter gave was fine: tty devices could very usefully
> > > be opened with something like
> > > 
> > >   fd = open("/dev/tty00/nonblock,9600,n8", O_RDWR);
> > > 
> > > where we actually open up exactly the same channel as if we opened up
> > > /dev/cua00, we just set the speed etc at the same time. Which makes things
> > 
> > Hmm, there might be problem with this. How do you change speed without
> > reopening device? [Remember: your mice knows when you close device]
> 
> If you implement it as a filesystem you coould have a settings file in the
> tty filesystem. Something like this:
> 
> echo "115200" >  /dev/tty/settings

You can currently do 

stty 115200

or 

stty 19200

when your stdin is serial port. If it is filesystem, you'll have hard
time finding *which* of serial ports it is, followed by opening it.

What about this?

bash < /dev/ttyS0 &
rm -r /dev/ttyS0
how does bash change speed of serial line, then?
                                                                Pavel
-- 
The best software in life is free (not shareware)!              Pavel
GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+
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