nosel

nosel.c

#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xfixes.h>

int main() {
	Display *dpy;
	Window root;
	int ev_base, err_base;
	XEvent ev;
	if (!(dpy=XOpenDisplay(0x0)))
		return 1;
	root = DefaultRootWindow(dpy);
	XFixesQueryExtension(dpy, &ev_base, &err_base);
	XFixesSelectSelectionInput(dpy, root, XA_PRIMARY, XFixesSetSelectionOwnerNotifyMask);
    int ignore = 0;
	while (!XNextEvent(dpy, &ev)) {
		if (ev.type == ev_base + XFixesSelectionNotify) {
            if (ignore) {
                ignore = 0;
            } else {
                ignore = 1;
                XSetSelectionOwner(dpy, XA_PRIMARY, None, CurrentTime);
            }
        }
    }
	return 0;
}