Path: utzoo!attcan!uunet!mcvax!inria!axis!coms!mickey
From: mickey@axis.fr (Michael Dance)
Newsgroups: comp.windows.x
Subject: XtAddInput
Keywords: Exceptions, select, XtInputException
Message-ID: <94@coms.fr>
Date: 16 Jun 89 21:23:49 GMT
Organization: Axis Digital, Paris
Lines: 34

Recently I have been writing a server that receives messages from its clients
form sockets (it was from named pipes (FIFO's) but I met a machine that
supported select but only on ttys, ptys and sockets - now the server reads
on sockets and writes in named pipes - bizarre but named pipes are neater).

Everything works OK but while I wrote it I noticed that XtAddInput (and select)
allow Exception events to be treated. Alas I haven't found anything to telle
me what constitues an event, for example an EOF on a socket is NOT an event.
AM I suffereing from culture shock (I'm used to 'pure' system V a la ATT
perhaps a BSD fan would already know). 

Anyway I treat exceptions as link failures and close down the server side for
the client whose socket 'exceptioned', is this right? I haven't a clue as I have
never received an exception. 

PS My sockets are TCP Stream sockets

PPS To those bickering :) about interface building tools the above mentioned
server is part of one such tool that although not as user-friendly as certain
micro resource contruction sets does allow easy definition of simple widgets
(static text, single line text edit, multi line text edit with vertical
scrolling, toggles (pushbutton with two states), scrollng lists and command
buttons). It interfaces directly with C programs, callbacks are primitve
but supported, updates of user program variables are also fairly simple.
AND it also functions on old-fashioned simple terminals (well most of it:)

All it needs is a really jazzy X windows graphical interface rather than
its curretn ascii definition files and I would be really proud of it, as
it is it's just quite good - ps I'm not advertising cos the name of the
company I work for is NOT in this message nor in the signature, nor the name of
the product.

Who wants to be an X guru - I just want to please my customers with recent
interfaces.