// gcc -o clipchange clipchange.c -lX11 -lXfixes -Wall
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xfixes.h>

int main(int argc, char* argv[]){
    Display *display = XOpenDisplay(NULL);
    
    Atom CLIPBOARD = XInternAtom(display, "CLIPBOARD", False);

//  XFixesSelectSelectionInput(
//      display, DefaultRootWindow(display), 
//      XA_PRIMARY, XFixesSetSelectionOwnerNotifyMask
//  );

    XFixesSelectSelectionInput(
        display, DefaultRootWindow(display), 
        CLIPBOARD, XFixesSetSelectionOwnerNotifyMask
    );
    
    XEvent event;
    for(;;){
        XNextEvent(display, &event);
        printf("event.type = %d\n", event.type);
    }
    
    XCloseDisplay(display);
    return 0;
}