#include <stdio.h>
#include <unistd.h>      /* pause() */
#include <xcb/xcb.h>

int
main ()
{
    /* Open the connection to the X server */
    xcb_connection_t *connection = xcb_connect (NULL, NULL);

    /* Get the first screen */
    const xcb_setup_t      *setup  = xcb_get_setup (connection);
    xcb_screen_iterator_t   iter   = xcb_setup_roots_iterator (setup);
    xcb_screen_t           *screen = iter.data;

    printf ("root window id %d\n", screen->root);

    xcb_disconnect (connection);

    return 0;
}