Что за поведение? Иксы

#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
int main() {
    Display *display;
    Window w1,w2;
    XEvent report;
    
    int screen_number;
    
    display = XOpenDisplay(NULL);
    if (!display) {
        printf("Невозможно установить соединение с X-сервером!\n");
        exit(1);
    }
    
    screen_number = DefaultScreen(display);
    
    w1 = XCreateSimpleWindow(display,
            RootWindow(display, screen_number),
            0,0,640,480,0,
            WhitePixel(display, screen_number),
            BlackPixel(display, screen_number));
    
    w2 = XCreateSimpleWindow(display,
            RootWindow(display, screen_number),
            0,0,640,480,0,
            WhitePixel(display, screen_number),
            BlackPixel(display, screen_number));
    
    XStoreName(display, w1, "Window 1");
    XStoreName(display, w2, "Window 2");
    
    XMapWindow(display, w1);
    XMapWindow(display, w2);
    
    while (1) {
        XNextEvent(display, &report);
    }
    
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
int main() {
    Display *d;
    Window w;
    XEvent report;
    int s;
    Atom  atom1, atom2;
    d = XOpenDisplay(NULL);
    if (!d) {
        printf("52>7<>6=> CAB0=>28BL A>548=5=85 A X-A5@25@><!\n");
        exit(1);
    }
    s = DefaultScreen(d);
    w = XCreateSimpleWindow(d,
            RootWindow(d, s),
            0,0,640,480,0,
            WhitePixel(d, s),
            BlackPixel(d, s));
    XStoreName(d, w, "Window 1");
    XMapWindow(d, w);
        atom1 = XInternAtom(d, "WM_PROTOCOLS", 0);
        atom2 = XInternAtom(d, "WM_DELETE_WINDOW", 0);
        XSetWMProtocols(d, w, &atom2, 1);
    while (1) {
        XNextEvent(d, &report);
                switch(report.type)
                {
                case ClientMessage:
                        if (report.xclient.message_type == atom1 &&
                                report.xclient.data.l[0] == atom2)
                        {
                                XDestroyWindow(d, w);
                        }
                case DestroyNotify:
                        XCloseDisplay (d);
                        return 0;
                }
    }
    return 1;
}