[uae] Re: netbsd emu
- From: Richard Drummond <evilrich@xxxxxxxxxxxxxx>
- To: uae@xxxxxxxxxxxxx
- Date: Sat, 5 Jun 2004 13:39:35 -0500
Hi Richard
On Saturday 05 June 2004 08:56 am, carbon wrote:
> I thought on Amiga the bsdsocket.library is a virtuell library in Ram
> not in libs:
You're right. ;-)
With a real TCP stack (e.g. Miami or AmiTCP), bsdsocket.library doesn't exist
as a disk-based library. It is created at run-time by the TCP stack when you
go online.
WinUAE also creates a memory-resident bsdsocket.library when the bsdsocket
emulation is enabled.
Currently, the bsdsocket emulation for Unix-like systems doesn't do that. The
Amiga side of the emulation is a disk-resident library. This will change,
eventually.
I'm currently pursuing two tracks of development on the bsdsocket emulation.
Firstly, I am working on improving the existing emulation (based on Carl
Drougge's work) and have made some progress here. This still current uses
Carl's disk-based bsdsocket.library, however. This is really due to laziness
or a lack of time to make it memory resident.
Secondly, Jeff Shepherd has been working on integrating Carl's existing
emulation with the core bsdsocket emulation that WinUAE uses. Thus, this uses
a memory-resident bsdsocket.library - just like WinUAE. I've done some work
on this myself, and got to the point where a lot more networking apps are
functional (or almost functional) and Jeff's just sent me a new bunch of
patches which should improve this a whole lot more. (Some of Jeff's work is
also applicable to the old version, so this will improve as well).
Unfortunately, this new work still has problems with some underlying
mechanisms. For instance, it relies on being able to call Amiga code from the
emulation and this requires some heavy voodoo to work (the stack magic code).
This code is non-portable - it's specific to the host CPU (and to some extent
the host OS). I've added PPC support recently, however. The current status is
that the stack magic code works on Linux hosts on PPC and x86, but only, it
seems, with 2.6 kernels (on 2.4 kernels, it causes all sorts of bugs with
pthreads). It also works on OS X.
I've recently had an idea how to implement the stack magic code in a more
portable way - or at least portable to SYSV-like systems (including Linux).
Hopefully this may cure the problems on 2.4 Linux kernels - we'll see.
Which of these two solutions will win out remains to be decided. If the
portability and other problems with stack magic stuff can be solved, Jeff's
new code may be the way to go, simply because it shares more code with WinUAE
and will be less work in the long run.
If anybody's interested in having a play with the new code, you can grab it
from the CVS repository at http://sf.net/projects/uaedev. Use the
--enable-bsdsock-new configure option to build Jeff's new bsdsocket
emulation.
Cheers,
Rich
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