C++ comm port and class help

using gcc (3.3.4), Slackware Linux 2.4.26.

I have working code to communicate with the comm port. I can read data from it and write data to it.

I reused that code exactly in a project I am working on, however now it doesn't seem to be working correctly. I create an instance of the class with all the controls for the port in it from another class and call the functions to open/read/write to the port.

Does anyone have experience with comm port communication within classes that might be able to assist me in this headache?

-mark