x11

Given a process iD of XX, I'd like to have a list of any window id's where _NET_WM_PID = XX. Even better would be the oldest still active window id if possible. I'm very new to linux, but what I'm trying to do is create a script that would take a command line, and see if there's a windows already open belonging to a process invoked with that same command line. If so, just set focus to that window, otherwise execute the command line to get a new process going. My intention is to use this in my ubuntu desktop, where I'll hook this script into my easystroke mouse gesture commands, so that, for

One of my new home projects will be a simple Window Manager, but before start I need to know some things: Which is the best language to do this? Where to get some resources to learn? One important decision is how you're going to talk to the X server. You can use the Xlib bindings for your language of choice, or you can use the higher-level XCB bindings. (If you're insane , you might open a socket to the X server directly.) To know how a window manager ought to behave, there are two documents that specify the conventions and policies: EWMH and ICCCM 1 . Conforming to these means your window

I have a gateway application that comes up with a login dialog and then a GUI window. I will be running this app on a co-located server without a display. I need to interact with the dialog only when logging in and perhaps to check out the main GUI occasionally. The server is Debian 5.0. The only ideas I have so far are: Tunnel an X session to my desktop for logging in but I'm not sure what will happen if the X session disconnected (ie, I reboot my desktop, etc..) Try to instantiate/launch the app from a wrapper Java application that can hopefully fill out the login dialog or login directly

I have written a program that runs with ROOT permission in Terminal following login but fails when XOpenDisplay(NULL) call is made following reboot. The program is started up via rc.local but doesn't appear to be able to see X11. I need ROOT because I make LibUSB calls and these fail if not ROOT. I can see the program is running with ROOT permission but inspection of environment variables shows DISPLAY not set. I have a delay loop running and checks are made after user login and user can see DISPLAY set in environment variables but program cannot. If program is terminated and run in Terminal

I am trying to create a game loop for an xlib window, but I cannot manage to paint the window correctly. Right now I am creating a window with XCreateSimpleWindow(...), and using a for loop to paint all pixels one at a time. (The color of these pixels is read from a large integer array, for now I've set all pixels to be blue.) The actual game loop right now is the following: void loop() { while (true) { // Clear the window (the background color is set to white) XClearWindow(dsp, win); // Loop through all pixels of the 800*600 window for (int j = 0; j < 600; j++) { for (int i = 0; i < 800; i++)