xvisbell.c

   1 /* briefly flashes a fullscreen white window to simulate a visual bell */
   2 #define _DEFAULT_SOURCE
   3 #include <X11/Xlib.h>
   4 #include <unistd.h>
   5
   6 int main (int argc, char** argv) {
   7         Display *display;
   8         Window  window;
   9         XWindowAttributes xwa;
  10         XSetWindowAttributes xswa;
  11         unsigned long bgcolor = 0xffffff;
  12
  13         /* parse command line arguments for 3bit colors */
  14         if (argc > 1) switch(argv[1][0]) {
  15                 case 'r': bgcolor = 0xff0000; break;
  16                 case 'g': bgcolor = 0x00ff00; break;
  17                 case 'b': bgcolor = 0x0000ff; break;
  18                 case 'c': bgcolor = 0x00ffff; break;
  19                 case 'm': bgcolor = 0xff00ff; break;
  20                 case 'y': bgcolor = 0xffff00; break;
  21                 case 'k': bgcolor = 0x000000; break;
  22                 case 'w': bgcolor = 0xffffff; break;
  23         }
  24
  25         display = XOpenDisplay(NULL);
  26
  27         /* indirectly aquire display resolution through root window's size*/
  28         XGetWindowAttributes(display, XDefaultRootWindow(display), &xwa);
  29
  30         window = XCreateSimpleWindow (display, XDefaultRootWindow(display),
  31                 0, 0, /* position left/top */
  32                 xwa.width, xwa.height,
  33                 0, 0, /* border settings */
  34                 bgcolor);
  35
  36         /*shut out window manager (makes window full screen over all monitors)*/
  37         xswa.override_redirect = 1;
  38         XChangeWindowAttributes (display, window, CWOverrideRedirect, &xswa);
  39
  40         XMapWindow(display,window);
  41         XFlush(display);
  42
  43         usleep(100000);
  44         return 0;
  45 }