Re: programming with pty(4)

[christos%zoulas.com@localhost (Christos Zoulas)]

On Jun 1, 12:21am, brook%nmsu.edu@localhost (Brook Milligan) wrote:
-- Subject: Re: programming with pty(4)

| On Thu, 31 May 2012 21:45:47 +0000 (UTC)
| christos%astron.com@localhost (Christos Zoulas) wrote:
| 
| > In article <20120531120352.4c293fba%viola.nmsu.edu@localhost>,
| > Brook Milligan  <brook%nmsu.edu@localhost> wrote:
| > >I have a program that opens a pty(4) on a NetBSD box and
| > >reads/writes on the master side.  I can connect to the slave side
| > >with tip(1) and communicate perfectly with the master side of the
| > >pty(4).  However, if I disconnect tip(1) with ~^D and try to
| > >reconnect, tip(1) reports a 'Device busy' error.  Presumably, I need
| > >to detect the fact that tip(1) disconnected and do something to the
| > >pty(4) device in order to allow a later connection, but I'm not sure
| > >(i) how to detect the disconnection and (ii) what to do when it
| > >happens.
| > >
| > >Any help with programming pty(4) devices is greatly appreciated.
| > 
| > Are you using BSD pty's or PTYFS?
| 
| BSD pty(4).

Make sure you close all the file descriptors, or use revoke(2) on the pty.

christos