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RING event on the serial port

Hi,

I have a modem that is connected to the serial port of my RedHat Linux machine and I want to listen for RING events on this port. For this, I open the COM port, select the file descriptor and wait for an event to occur. I get the interrupt when I dial my modem, but how can I make sure that select returned because of RING event and not because of some other activity on the serial port?

Thanks,
Ruchika
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