Getting status of DCE device from a DTE device

[Sean Sheridan Coleman X5672]

Is there a way from inside a C program to find out if
DATA CARRIER DETECT is high on the Data communication devices?

I want my program to see if there is a modem device on the
other end of the cable before it tries to use that port.
I am trying to make sure that the port plugged into the 
back of my Sparc Station is hooked into something.


Thanks

Sean Coleman
NIST
coleman at bldrdoc.gov