On Wed, Dec 13, 2006 at 11:27:12AM +0900, Seongsu Lee wrote:
> How can I distinguish the X related proccesses (X server or
> X clients) among the all processes in the system?
Can you share with the list *why* you want to do that? It sounds like a
quite insane idea.
> For example, I think the follows are some candidate to distinguish
> the X related processes:
>
> 1) They use specific system calls to manupulate the display.
The X server *sometimes* uses a special syscall, iopl, to get access to
the graphics card. But eg. the framebuffer driver does not.
> 2) Specific network port number(or UNIX domain sockets) is
> used to communicate between X server and X clients.
Yes, you could use this. It would actually work even from userland,
because you can find open sockets by reading data in /proc -- see how
lsof and netstat work.
> 3) They refer specific environmental variables such as DISPLAY.
You are out of luck here. The environment, as a whole, is passed along
with program arguments and noone from outside can look how the program
uses it.
> What do you think of this?
Another alternative would be looking for descendants of the 'xinit'
process, which you can probably find simply by looking which processes
are executing /usr/bin/xinit.
> Any ideas?
It really depends on why you want that information.
You should be aware, that you can't ever reach all X clients of some
server, because they can be running on other machines.
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