Re: [ECOS] Termios and waiting for character input

[Gary Thomas <gary at mlbassoc dot com>]

Jonathan Larmour wrote:
> Gary Thomas wrote:
> > Andre-John Mas wrote:
> >
> > > Hi,
> > >
> > > I have the code below. I want to be able to block until something
> > > is inputted and then continue. The only problem is am finding that
> > > it continues even without anything being inputed. What should I be
> > > doing differently:
> >
> >
> > It looks like a bug :-(  It seems when ICANON is turned off, the
> > channel becomes non-blocking and will return EOF (or the equivalent)
> > when read.  I tried the attached program - on Linux it works as
> > expected, but on eCos, it gets EOF.
> >
> > Jonathan - you worked the termios code originally - any ideas?
>
> Non-canonical mode processing was only implemented to support 
> VMIN=0,TIME=0. Support for VMIN>0 is rudimentary and I wouldn't trust 
> it. But VMIN defaults to 0, and that sample code posted doesn't attempt 
> to set it to anything else.
>
> I imagine it defaults to something else on Linux, hence the difference 
> in behaviour. <fx: goes and checks> Aha, in fact it defaults to 6. The 
> POSIX standard does not set any requirements for the default value, so 
> eCos is fine on this count.

Thanks for looking into this.

Perhaps we should make the default values for VMIN/VMAX configurable,
possibly with settings that match other systems?

--
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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