Date: Fri, 22 Dec 2000 07:21:46 GMT From: Cliff S. <csbsd@raggedclown.net> To: Andy Farkas <andyf@speednet.com.au>, Jimmy Thomson <glitch@execpc.com>, freebsd-questions@FreeBSD.ORG Subject: Re: pty's? Message-ID: <E149MWQ-000EAN-00@post.mail.nl.demon.net>
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>
> On Thu, 21 Dec 2000, Jimmy Thomson wrote:
>
> > On Fri, 22 Dec 2000, Andy Farkas wrote:
> > > It looks to me like /dev/MAKEDEV can make a maximum of 256 pty's by saying
> > >
> > > # cd /dev
> > > # /bin/sh MAKEDEV pty7
> > >
> > > (yes, the '7' seems a bit confusing to me too...)
> > >
> >
> > MAKEDEV pty7???
> >
> > Anyone have any clue what the heck that does?
>
> As I said, it makes 256 ptys. Sheesh.
Well, I for one could think of a slightly better engineered
interface. It could hardly be called intuitive that a parameter
of pty7 makes 256 ptys. Maybe pty256 would be cuter :). Then again...
My Xmas 2 cents (dutch) worth..
Cliff
>
> /dev/MAKEDEV has this in it:
>
> pty*)
> class=`expr $i : 'pty\(.*\)'`
> case $class in
> 0) offset=0 name=p;;
> 1) offset=32 name=q;;
> 2) offset=64 name=r;;
> 3) offset=96 name=s;;
> # Note that xterm (at least) only look at p-s.
> 4) offset=128 name=P;;
> 5) offset=160 name=Q;;
> 6) offset=192 name=R;;
> 7) offset=224 name=S;;
>
> Which means that:
>
> # /bin/sh MAKEDEV pty0 - will make 32 ptys
> # /bin/sh MAKEDEV pty1 - will make 64 ptys
> # /bin/sh MAKEDEV pty2 - will make 96 ptys
> # /bin/sh MAKEDEV pty3 - will make 128 ptys
> # /bin/sh MAKEDEV pty4 - will make 160 ptys
> # /bin/sh MAKEDEV pty5 - will make 192 ptys
> # /bin/sh MAKEDEV pty6 - will make 224 ptys
> # /bin/sh MAKEDEV pty7 - will make 256 ptys
>
> Hope this helps.
>
> --
>
> :{ andyf@speednet.com.au
>
> Andy Farkas
> System Administrator
> Speednet Communications
> http://www.speednet.com.au/
>
>
>
>
>
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