x11-copilot.c

#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
    Display *dpy;
  
    // Below here, Copilot generated the rest.
    dpy = XOpenDisplay(NULL);
    if (dpy == NULL) {
        fprintf(stderr, "Cannot open display\n");
        exit(1);
    }
    Window root = DefaultRootWindow(dpy);
    XSetWindowAttributes attr;
    attr.override_redirect = True;
    Window win = XCreateWindow(dpy, root, 0, 0, 1, 1, 0, CopyFromParent, InputOnly, CopyFromParent, CWOverrideRedirect, &attr);
    XMapRaised(dpy, win);
    XFlush(dpy);
    XEvent ev;
    XNextEvent(dpy, &ev);
    XDestroyWindow(dpy, win);
    XCloseDisplay(dpy);
    return 0;
}