Re: TCP/IP Server concepts (RPGLE)

[Patrick Townsend <townsend@xxxxxxxxxxxxxx>]

David,

A couple of ways you can do this:

1. Use the spawn() function. Fork is not implemented. The UNIX system
reference manual should give you some hints on how to do this. V3R2 is
not a great platform for spawn, so you might want to look at the next
option.

2. Use the givedescriptor() and takedescriptor() functions. It's a
little weird, but works. You start an application that puts its job
information on a data queue and waits for a response. Your server
application listens/accepts a connection, reads the data queue, gives
the descriptor to the job waiting for it. There's an example somewhere
(in the C or TCP/IP manuals).

Patrick

David Gibbs wrote:
> 
> Ok, here's a question for all you "Bare Metal" Programmers out there...
> 
> I've got a simple TCP/IP server written in V3R2 RPGLE and it works ... but I
> need to make the process more robust.
> 
> I need my server program to be able to handle multiple clients at the same
> time... but in a "Stateful" manner (i.e., the server has to do a whole bunch
> of work for the client and keep track of what is going on).  Kinda like
> evoking an ICF comms program and carrying on a conversation (send, receive,
> send receive, etc).
> 
> >From my research, I've determined that if the server were written in C... on
> Unix... I would use the "fork()" operation to detach from the current
> process into a child process and the socket would handed off to the child.
> The server program would then allocate another socket and go back into a
> "listen()" mode.
> 
> Is this basic logic possible to do in V3R2 RPGLE?  Am I biting off more than
> I can chew?
> 
> Thanks!
> 
> david
> 
> 
> --
> 
> David Gibbs
> Sr. Software Engineer
> Mortice Kern Systems US, Inc.
> 2500 S. Highland Ave., Suite 200
> Lombard, IL  60148
> 
> phone: (630) 495-2108 x5004
> http://www.mks.com <http://www.mks.com/>
> mailto:dgibbs@mks.com <mailto:dgibbs@mks.com>
> 
> Opinions expressed are strictly my own and do
> not necessarily reflect those of my employer.
> 
> 
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-- 
IBM AS/400 communications, FTP automation, and network security
software and consulting services.

http://www.patownsend.com


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