RTS sensing in C

[Arrigo Benedetti]

Is there any way of sensing the state of the RTS/CTS line of the serial interface in a C program ?
I know that I could probably read the 8250 status register, but I'm looking for
a solution which is hardware independent.
BTW is there any other modem control signal that I can detect from a C program
or shell script ? I know how to sense the DCD, but what about, for example, the DTR line?

I appreciate in advance any suggestions.

-Arrigo

P.S. the application should be portable to several unix platforms, but will 
run primarily in the SCO Unix/Xenix environment.

-- 
Arrigo Benedetti                      | USENET:  root at pubit.sublink.ORG
Via S.Agata 11, 41100 Modena - Italy  | BANG:    ..!rutgers!deejay!gear!pubit
VOICE +39.59.216688 FAX +39.59.220727 | 
TELEX 512007 PUBIT I                  | Sublink ... the Italian **nix link ...