Determining Carrier on Modem

[Jeffrey A. Thompson]

I would like to know how to determine if a modem has or doesn't have a carrier.
The program has an open file descriptor (O_RDWR) associated with the modem 
device. The program waits on messages to send to the modem and the other modem 
could have timed out and dropped the carrier. 

Please reply to me via email, and if there is sufficent interest, I will post
the results.

Jeffrey Thompson