rjshaw at netspace.net.au
Fri Sep 9 19:54:09 PDT 2005
Tim Roberts wrote:
> ramalingareddy bommalapura wrote:
>> Can anybody please suggest how hooking can be done
>> in the xserver functions. XServer needs to invoke my function before
>> the call is passed to the XServer original function. I have found that
>> this is the procedure in windows for doing hooking:
> X is entirely different from Windows. The same internal concepts simply
> do not apply. What are you REALLY trying to do? If you tell us your
> real task, instead of how you think you need to solve it, perhaps one of
> us can offer a real solution.
> There are two aspects to X: client and server. GUI programs (X clients)
> call routines in Xlib to do drawing. These are things like XDrawArc and
> so on. Xlib exists in the process of the GUI program. It converts the
> calls into messages that are transmitted over a socket to the X server,
> which does the actual drawing. The X server is a completely separate
> process. The messages are parsed, and eventually handed down to some
> driver that does the drawing.
> It is possible to insert a "tee" into the socket stream and split off a
> second copy for yourself, but that means parsing the X protocol, not
> handling APIs.
Page 583 of Xlib Programming Manual ISBN: 1565920023 explains hooking
into Xlib. Xlib is the client-side, not the X server side.
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