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thats exactly what I want. My priority is in the interface, one interface controling 2 ports but u get the picture.

// allow the process to receive SIGIO
fcntl(fd1, F_SETOWN, getpid()) ;...

I am using GTK 2.0 to write a program to control two IO ports; ttyS0 and ttyUSB0. If i were to open two different copies of the same program then it's all fine, but i need to be able to control two...