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From: paul@frcs.UUCP (Paul Nash)
Newsgroups: comp.unix.internals,comp.unix.programmer,comp.unix.wizards,comp.unix.questions
Subject: Hardware flow control for TTY ports under V.3
Message-ID: <451@frcs.UUCP>
Date: 10 Apr 91 20:35:20 GMT
Distribution: comp
Organization: Free Range Computer Systems CC
Lines: 22

I think that I have a problem.  I need to talk from a TTY port on
a 386 Unix box (Intel V.3.2) to a device that does hardware flow
control.  The output port (currently) uses the FAS drivers, but
this software needs to be portable to machines that don't have
such luxuries.

When I openthe port, I use a TCSETA ioctl() to play with baud rates,
etc.  However, as far as I can tell, whether or not I set CLOCAL
(which is the only relevant looking flag that I can find), dropping
CTS doesn't halt the port.  What am I doing wrong?  Is there a 
hidden flag, or a hidden field in the termio struct, or a hidden
ioctl call?  Is there something else entirely that I should use for
this?  Is my break-out box broken?

I have read the entire FM from cover to cover, in _both_ directions,
about 10 times, and still can't find the answer.  

	paul

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Paul Nash				   Free Range Computer Systems cc
paul@frcs.UUCP				      ...!uunet!m2xenix!frcs!paul