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         unsigned long bgcolor = 0xffffff;
  11
  12         /* parse command line arguments for 3bit colors */
  13         if (argc > 1) switch(argv[1][0]) {
  14                 case 'r': bgcolor = 0xff0000; break;
  15                 case 'g': bgcolor = 0x00ff00; break;
  16                 case 'b': bgcolor = 0x0000ff; break;
  17                 case 'c': bgcolor = 0x00ffff; break;
  18                 case 'm': bgcolor = 0xff00ff; break;
  19                 case 'y': bgcolor = 0xffff00; break;
  20                 case 'k': bgcolor = 0x000000; break;
  21                 case 'w': bgcolor = 0xffffff; break;
  22         }
  23
  24         display = XOpenDisplay(NULL);
  25
  26         /* indirectly aquire display resolution through root window's size*/
  27         XGetWindowAttributes(display, XDefaultRootWindow(display), &xwa);
  28
  29         window = XCreateSimpleWindow (display, XDefaultRootWindow(display),
  30                 0, 0, /* position left/top */
  31                 xwa.width, xwa.height,
  32                 0, 0, /* border settings */
  33                 bgcolor);
  34
  35         Atom wdialog = XInternAtom (display, "_NET_WM_WINDOW_TYPE_DIALOG", 1);
  36         XChangeProperty (display, window,
  37                 XInternAtom (display, "_NET_WM_WINDOW_TYPE", 1),
  38                 XInternAtom (display, "ATOM", 1),
  39                 32, PropModeReplace, (unsigned char *) &wdialog, 1);
  40
  41         XFlush(display);
  42         XMapWindow(display,window);
  43         XFlush(display);
  44
  45         usleep(100000);
  46         return 0;
  47 }