On 2014-07-17, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote:
> tcflow(TCOxxx) flow control is independent of IXON flow control.
> The union of both flow states determines if the tty can output;
>
> IXON = true IXON = false
> START STOP
> tcflow(TCOON) on off on
> tcflow(TCOOFF) off off off
Thanks, that's pretty much what I had decided based on tests and
browsing the source code.
Just to confirm:
tcflow(TCION/TCIOFF): overrides the "input" side of xon/xoff flow
control and forces the sending of XON/XOFF.
tcflow(TCOON/TCOOFF): does not have anything to do with the "output"
side of xon/xoff flow control, but controls
something completely orthogonal.
That rather counter-intuitive (not that counter-intuitive is exactly a
novel thing when it comes to Unix serial ports).
That rasies this question: what does an application use to control the
"output" side of xon/xoff flow control? There is a Windows API for
doing that, and I get asked how to do it in Linux. I always tell them
they can't.
--
Grant Edwards grant.b.edwards Yow! Oh, I get it!!
at "The BEACH goes on", huh,
gmail.com SONNY??
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