Help about serial programming: manipulating DTR

[llandre <r&d2 at dave-tech dot it>]

Hi all,

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.


Thanks a lot in advance,

llandre

DAVE Electronics System House - R&D Department
web:   http://www.dave-tech.it
email: r&d2@dave-tech.it


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