1// root attributes
 2
 3#include <stdio.h>
 4#include <xcb/xcb.h>
 5#include <stdlib.h>
 6#include <unistd.h>
 7
 8xcb_connection_t *connection;
 9
10int
11get_root_info(char attr_name)
12{
13    int attr;
14    const xcb_setup_t *setup = xcb_get_setup(connection);
15    xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
16    xcb_screen_t *screen = iter.data;
17    switch (attr_name) {
18        case 'w':
19            attr = screen->width_in_pixels;
20            break;
21        case 'h':
22            attr = screen->height_in_pixels;
23            break;
24        case '?':
25            fprintf(stderr, "wrong attr\n");
26            exit(1);
27    }
28    return attr;
29}
30
31int
32main(int argc, char *argv[]) 
33{
34    int opt;
35    if (argc < 2) {
36        fprintf(stderr, "usage: %s -wh\n", argv[0]);
37        exit(1);
38    }
39    connection = xcb_connect(NULL, NULL);
40    while ((opt = getopt(argc, argv, "wh")) != -1) {
41        printf("%d ", get_root_info(opt));
42    }
43    printf("\n");
44    xcb_disconnect(connection);
45    return 0;
46}