On Feb 2 17:34, llandre wrote: > 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.
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 -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader mailto:cygwin@cygwin.com Red Hat, Inc. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
