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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Xutil.h>
#include <X11/Shell.h>
// listen for mouse motion in all windows under the given one
//
void listen_for_mouse(Display* display, Window window) {
Window parent, *children;
unsigned int nchildren;
int retval;
retval = XQueryTree(display, window, &window, &parent, &children, &nchildren);
if (retval == FALSE) {
fprintf(stderr, "XQueryTree() failed: %d\n", retval);
return;
}
if (nchildren == 0) return;
XSelectInput(display, window, PointerMotionMask);
for (int i=0; i<nchildren; i++) {
XSelectInput(display, children[i], PointerMotionMask);
listen_for_mouse(display, children[i]);
}
XFree((char *)children);
}
// test program for the above.
//
#if 1
int main(int argc, char **argv) {
XEvent event;
int count = 0;
Display* display;
const char* hostname = argv[1]?argv[1]:":0";
display = XOpenDisplay(hostname);
if (!display) {
fprintf(stderr, "XOpenDisplay(%s) failed\n", hostname);
exit(1);
}
fprintf(stderr, "Sleeping for 10 sec\n");
sleep(10);
fprintf(stderr, "Checking for mouse movement\n");
listen_for_mouse(display, DefaultRootWindow(display));
XNextEvent(display, &event);
if (event.type == MotionNotify) {
fprintf(stderr, "mouse moved, exiting\n");
exit(0);
}
}
#endif
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