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From: root@pubit.sublink.ORG (Arrigo Benedetti)
Newsgroups: comp.unix.questions
Subject: RTS sensing in C
Message-ID: <33@pubit.sublink.ORG>
Date: 20 Aug 90 19:41:57 GMT
Distribution: comp
Organization: Arrigo Benedetti - Via S.Agata 11 41100 Modena - Italy
Lines: 18

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.

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