Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cmcl2!kramden.acf.nyu.edu!brnstnd
From: brnstnd@kramden.acf.nyu.edu (Dan Bernstein)
Newsgroups: comp.unix.internals
Subject: Re: Device Emulation with a pty?
Message-ID: <1978:Oct803:29:0790@kramden.acf.nyu.edu>
Date: 8 Oct 90 03:29:07 GMT
References: <6372@emory.mathcs.emory.edu>
Organization: IR
Lines: 17

In article <6372@emory.mathcs.emory.edu> km@mathcs.emory.edu (Ken Mandelberg) writes:
> I would like to use a pty to let a process emulate a device.  However,
> it looks to me like the pty interface doesn't really provide enough
> control and status on the master side.

A pty only acts like a device over the lifetime of one session. It isn't
meant to survive past hangup. (Though you can set the tty speed to 0 to
simulate a hangup on some systems.)

What are you really trying to do?

>  * detect device specific slave side ioctls and reply to them from
>    the master side.

Look up TIOCPKT and TIOCREMOTE.

---Dan