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- Newsgroups: comp.os.linux
- Path: sparky!uunet!think.com!enterpoop.mit.edu!bloom-picayune.mit.edu!daemon
- From: Dave@usppc.abb.com
- Subject: Re: Client/Server Coding
- Message-ID: <1993Jan10.214348.10114@athena.mit.edu>
- Sender: daemon@athena.mit.edu (Mr Background)
- Reply-To: Dave@usppc.abb.com
- Organization: The Internet
- Date: Sun, 10 Jan 1993 21:43:48 GMT
- Lines: 77
-
- Thanks for your note, Mike. Its a nice rest from polishing something
- for client installation tomorrow.
-
- | Are you programming/running a Linux system?
-
- Maybe later this year. My old Amiga 1000 has been getting terribly
- lonely and terribly dated. I currently look after Vaxen and Sun 4's
- and make stuff for operator traning simulators and power plant
- monitoring computers.
-
- I'd like to learn a little X and C++ and was looking at Linux on a new
- DECpc 433 as a place to do that.
-
- | Any idea what system/library calls would be of interest?
-
- If Linus has a TLI socket interface, that would be the way to go if you
- do your own protocols. The Berkeley sockets interface is obsolescent.
- TLI is System V ready.
-
- My personal preference is to use Open Network Computing Remote
- Procedure Calls. Any NFS capable platform has the necessary RPC and
- XDR libraries. The advantages are
-
- RPC presents the metaphore of a procedure call to both client
- and server
-
- RPC uses XDR (external data representation) to achieve machine
- independence
-
- RPC isolates you from the transport and uses the ones
- available. Then newest flavor is TLI RPC. It will use any TLI
- supported protocol which the server offers (i believe with
- automatic negotiation of the protocol to use).
-
- You can literally saw a monolithic application in two and make it
- client- server using these libraries.
-
- XDR lets radically different machines participate in the application by
- converting everything exchanged between them to canonic form. Your PC
- can colaborate with a VAX or an AXP machine, "no problemo".
-
- We did just this at work to make several server processes distributed
- for use in an nuclear power plant operator training simulator. It took
- about two weeks to put the prototype together starting with library
- routines for our existing data dictionary and snapshot librarian.
-
- Sun recommends using XDR routines to convert internal data into canonic
- form for reading and writing files. This allows machines of different
- architectures to share binary files sitting on the NFS server.
- Radical!
-
- | Stevens book's strengths?
-
- I like Steven's "UNIX Network Programming ..." It is very complete up
- to remote procedure calls. It covers pipes, sockets, system V
- messages, shared memory, and semaphores and essential UNIX system
- calls. It then does telnet, rmt, rlogin, rcmd, rexec, lpr, ping,
- time-and-date, as examples. I haven't been through them all, but his
- System V IPC chapter saved us a lot of pain at PPC.
-
- | Power Programming with RPC comments
-
- The O'Rilley book is OK on RPC. I hate the PC puke title. It has good
- examples but its not up to the high standard set by the Stevens books.
- It does compare ONC and DNC (OSF style) remote procedures. The two
- camps have dulled the hatchets and agreed to make their RPC's the
- same. He develops several example applications and makes his
- presentations in more detail that the those in the Sun Programmers
- Guide.
-
- We did our first application mostly with the Sun tutorials. They have
- example code on several servers. I believe you can get it from
- uunet.uu.net if it is not part of the Linux distribution or archives.
-
- Regards
- Dave.Hamby
- Usppc.Abb.Com
-