Re: serial device access from welcome script

[Christopher Fowler <cfowler@outpostsentinel.com>]

Use the files /dev/stdin and /dev/stdout

On Thu, 2006-09-07 at 16:44 +0200, Thilo Riessner wrote:
> Am Mittwoch, 6. September 2006 23:53 schrieben Sie:
> > Thilo Riessner writes:
> > > >From a program called by the welcome script which tries to access the
> > > > serial
> > >
> > > port (in this case /dev/ttyI0) I get the errormessage:
> > >         Port or socket open error!
> > > I guess, that the serial port is blocked by the pppd.
> > > Is there any possibility to access the serial port nevertheless?
> >
> > You shouldn't be trying to access the port directly.  Instead, when
> > the "welcome" script runs, your script's standard input and standard
> > output are connected directly to the tty.
> >
> > You should be able to use 'read' and 'echo' (or whatever your
> > scripting language supports) without having to open anything.
> >
> > This is true for "connect", "disconnect", "init", and "pty" as well.
> Thanks for your hint, but I have the problem, that the program (which is a 
> binary program) I am running out of my welcome script (which is a bash 
> script) does not support the usage of stdin and stdout, but it demands the 
> usage of a device for reading and writing. Is there a trick that I could use 
> in the  welcome script to  redirect stdin and stdout to a "device" and use 
> that device in the program, which is called from the welcome script.
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