Re: serial device access from welcome script
Thilo Riessner <thilo <at> riessner.de>
2006-09-07 14:44:45 GMT
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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