Oops ... that should read: "Twisted does _not_ prevent it..." Twisted is great. Eric is an idiot. Some more details for the internet to record for posterity: The X.25 interface under Linux is socket based. You can use your friends listen/connect/accept/send/recv with the underlying X.25 drivers. The X.25 API on Sun and IBM AIX is SysV Streams based, and you interact with the X.25 device with different system calls. As you know, twisted works great for sockets, and it _seems_ like it would be simple enough to do. But Python does not quite support the interface necessary to create real X.25 connections. With some simple C extensions you can expose the API. The main problem is that the format of a X.25 address is quite different from a TCP/IP address. Once you get a file descriptor, it can be integrated with the Reactor. My only problems with Twisted were trying to make the X.25 API as full-featured as a TCP/IP connection. With some effort, I'm sure it can be done. I've successfully used X.25 against the Linux loopback device, and on the real hardware under Solaris and AIX. I've done all three with Python. If you want any other help with this, please contact me off list. -Eric ecn@metaslash.com On Tue, Sep 17, 2002 at 02:20:42PM -0400, Eric C. Newton wrote:

Twisted does prevent it, but there is no built-in support. This is not suprising since X.25 APIs are different on nearly every platform.

I tried re-patching my changes back in recently and had little success. I may come back to this in a couple of months.

-Eric

On Tue, Sep 17, 2002 at 06:51:26PM +0200, Sergio Lobo wrote:

...

Hello,

I just found the article below on the web. Would anybody please let me know if Twisted-Python provides any support for the X.25 protocol?

Kind regards Sergio Lobo

[Twisted-Python] adding a new connection type Eric C. Newton twisted-python@twistedmatrix.com Sun, 26 May 2002 22:30:45 -0400

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Itamar Shtull-Trauring <twisted@itamarst.org> writes:

...

Well, first of all, what does it run over?

X.25. Be afraid.

...

And in what languages is it written?

It runs in Python of course.

...

And, what is it good for?

X.25 is an international standard for wide area communications widely adopted by companies in the 1970's and early 80's using packet-oriented, synchronous serial communications devices.

I'm using Linux, and playing with 2-year-old patches for version 2.4 of the kernel which enables me to play with the API over a loopback device.

Sometimes it even works.

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