Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!virtech!cpcahil
From: cpcahil@virtech.uucp (Conor P. Cahill)
Newsgroups: comp.unix.questions
Subject: Re: Serial I/O in SCO Unix
Message-ID: <1990Mar22.022722.603@virtech.uucp>
Date: 22 Mar 90 02:27:22 GMT
References: <22824@adm.BRL.MIL>
Reply-To: cpcahil@virtech.UUCP (Conor P. Cahill)
Organization: Virtual Technologies Inc., Sterling VA
Lines: 20

>        Can I send and receive data via serial port by calling open(), read()
>and write() on tty device?

Yes.  It doesn't matter what the device you have attached to the port, you
can treat it as a standard file (that's what UNIX is all about).

>If not, how can I poll/read/write serial port just like DOS environment (which
>use interrupt)? For example, direct programming the hardware (serial port) in
>Unix?

You can't direct program the hardware from unix.  You use ioctl()s to perform
the same kind of functions.  See the termio(7) (not sure about the manual
section numbering under SCO Unix) man page for the ioctl commands and
arguments.


-- 
Conor P. Cahill            (703)430-9247        Virtual Technologies, Inc.,
uunet!virtech!cpcahil                           46030 Manekin Plaza, Suite 160
                                                Sterling, VA 22170