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From: cyamamot@castor.usc.edu (Cliff Yamamoto)
Newsgroups: comp.unix.questions
Subject: Interprocess communications - help! :(
Keywords: bind, socket, listen
Message-ID: <4107@merlin.usc.edu>
Date: 16 Jun 89 14:34:45 GMT
Sender: news@merlin.usc.edu
Reply-To: cyamamot@castor.usc.edu (Cliff Yamamoto)
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Organization: University of Southern California, Los Angeles, CA
Lines: 28

Hello

	I'm trying to write a program which can monitor the values of the
numerical variables of another program in "almost" real-time.  I've looked
into 'ptrace' and shared memory but I think I'd like to use sockets.

	My problem is just trying to get a darn socket-demo program to
work.  I'm using an example from "The Design of the Unix Operating System"
by Maurice J. Bach - AT&T press pp. 383.

Some questions :

Is the 'server' supposed to run in background/foreground?
Is the 'client' supposed to run in background/foreground?
(In general, how are what needs to be done to run the 'server' and 'client'?)

>>>> Can someone *please* send my any kind of working 'socket' demo between
     two processes? (we're using BSD 4.3 on Sun 3/260s - Sun OS 4.0) <<<<

I'm not sure if my programs are faulty or if the way I'm trying to execute
them is faulty.  If someone thinks there is a better way to go than using
sockets, please let my know.  But is must be portable, so I can't use Sun's
dbx or dbxtools and ptrace can't handle forks within a program and shared
memory seems to imply shared variable types, which my monitor program and
target program obviously won't have.

Thanks again!!
Cliff Yamamoto