Hello,
I'm new here. Sorry if the answer to my questions exist somewhere in the
archives - I did search but couldn't find anything. Sorry this is a bit
long, I wanted to explain what I need as clearly as possible:
I have an intranet web server that allows our users to browse a
hierarchy of data files which represent graphs. On selecting a data file
the server runs a kind of cgi executable that transforms the file into a
graph image and serves it up in an html page. The executable is ours and
unfortunately cannot run without an X display to generate a pixmap,
which is where VNC comes in very handy :)
I'm currently just testing the whole thing using a single VNC server on
the webserver for all requests and it works - but what I want to avoid
is "graphical collisions" on the VNC server's display when making the
images, i.e. one users pixmap obscuring anothers. So ideally I'd like to
create a VNC server per user session. I'm using PHP sessions by the way
attribute session ids.
The problem I have is knowing when a particular VNC display is no longer
needed. I know when a user initially connects and requests an image so I
could at that point create a VNC server and register that display as
belonging to the session. The user would continue to generate images on
"his/her" server/display as long as their session was open. As I said
though I don't really know when the session ends so I'd end up with an
awful lot of inactive VNC servers running after a short time :(
I could use inetd to run VNC, but that would bring up a server per image
request, which seems like a lot of stopping/starting to me ;) and I
guess would be slower. (a user may look at many tens of graphs per session).
What I'd really like to do is have a users VNC server die quietly after
a defined period of inactivity but I can't find any option to do this. I
know this goes against the usual idea of keeping a VNC server alive but
for this kind of usage it would be a really handy!
Any tips would be really appreciated.
Thanks
Paul
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