[9fans] Plan9port GUI applications don't work in Nx session

[Aram Hăvărneanu]

I have a Windows machine that runs an X server and a Linux machine
running plan9port.  When I use the Windows machine to connect to the
Linux machine via ssh, with X forwarding enabled, plan9port GUI
applications like acme and sam work perfectly.  In this case the
environment is:

    SSH_CLIENT=192.168.0.10 58970 22
    SSH_CONNECTION=192.168.0.10 58970 192.168.0.12 22
    DISPLAY=localhost:10.0

Nx is a technology that runs an X server proxy both on the server and
on the client, proxy that serves requests locally when it can and
batches requests reducing the number of round trips tremendously.
I've seen X applications that did tens of thousand of X requests do
only 20 requests on the wire with Nx. It's usable even on dial up.
There's a commercial implementation: http://www.nomachine.com and two
open source implementations, FreeNX: http://freenx.berlios.de and one
by Google, Neatx: http://code.google.com/p/neatx .

Plan9port applications don't work in Nx, for some reason. The environment is:

    SSH_CLIENT=::1 41980 22
    DISPLAY=:1011.0

Acme errors with:

    X error: error_code=8, request_code=1, minor=0 disp=1d72230
    BadMatch (invalid parameter attributes)
    X error: error_code=3, request_code=8, minor=0 disp=1d72230
    BadWindow (invalid Window parameter)
    X error: error_code=3, request_code=3, minor=0 disp=1d72230
    BadWindow (invalid Window parameter)
    XGetWindowAttributes failed
    X error: error_code=4, request_code=54, minor=0 disp=1d72230
    BadPixmap (invalid Pixmap parameter)
    X error: error_code=3, request_code=2, minor=0 disp=1d72230
    BadWindow (invalid Window parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    X error: error_code=13, request_code=56, minor=0 disp=1d72230
    BadGC (invalid GC parameter)
    9pserve: announce unix!/tmp/ns.aram.:1011/acme: Address already in use
    acme: can't post service: 9pserve failed

I don't know if this is an X error, or a Plan9 environment error.  I
have this in my /tmp:

    r60% ls -d /tmp/ns*
    /tmp/ns.aram.:1011
    /tmp/ns.aram.localhost:10

The 'localhost' string is missing, because $DISPLAY doesn't have it.
Does this confuse plan9port? In /tmp/ns.aram.:1011 I have:

    r60:~$ ls -l /tmp/ns.aram.:1011
    total 0
    srwxr-xr-x 1 aram aram 0 2012-01-14 14:10 acme=
    srwxr-xr-x 1 aram aram 0 2012-01-14 14:10 plumb=

Any tips? Thanks,

-- 
Aram Hăvărneanu