Re: serial device access from welcome script

[Thilo Riessner <thilo@riessner.de>]

The program needs one device for reading and writing. Therefore the /dev/stdin 
and /dev/stdout is not usable. Or do I get something wrong there?


> 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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