Getting focused window in TWM

[Riza Dindir]

Hello

I wanted to write a simple X application that shows me the currently
focused window on twm. But this always returns the root window (0x1).

The code is below. I have simplified the code to this, still not able to
get the currently focused window. I would think, when I run this code in a
terminal, that terminal window will be the window that has the focus.

I was wondering why I could not get the focused window? Anybody have an
idea?

Regards

Code
-------

 1
 2 #include <X11/Xlib.h>
 3 #include <X11/Xutil.h>
 4 #include <X11/Xatom.h>
 5
 6 #include <stdio.h>
 7 #include <stdlib.h>
 8
 9 int main(int argc, char **argv) {
10     Display *dpy;
11     Window current;
12     int revert_to;
13
14     if ( (dpy = XOpenDisplay(NULL)) == NULL)
15         return 1;
16
17     XGetInputFocus(dpy, &current, &revert_to);
18     printf("current: %p\n", (void *)current);
19
20     return 0;
21 }