Mail Archives: cygwin/2005/02/03/04:23:17
On Feb 3 09:52, llandre wrote:
>
> >> I'm trying to manipulate the DTR signal of the serial port.
> >> As an example I used this code snippet:
> >> http://lists.exploits.org/upsdev/Feb2004/00013.html.
> >> I can open the com1, I can send and receive data but the ioctl I use
> >> to read the status of the signals returns -1:
> >>
> >> int status;
> >> ioctl(upsfd, TIOCMGET, &status);
> >>
> >> Anybody can help me? I have no idea about what's wrong with this code.
> >
> >strace would give a hint. TIOCMGET should only fail because a call to
> >GetCommModemStatus fails. If so, the strace would contain a line which
> >talks about setting errno in fhandler_serial::ioctl.
>
> Corinna,
>
> thanks a lot for your advice.
> I tried to use strace. Here is what I see:
That's not enough information, so I try an educated guess. It looks
like the file you opened is not recognized as serial interface. What
did you use as device name? FYI, it should be either "/dev/com1"
or /dev/ttyS0" for the first serial.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader mailto:cygwin AT cygwin DOT com
Red Hat, Inc.
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