程式語言 - Wayland - WAYLAND_DEBUG

參考資訊：
https://jan.newmarch.name/Wayland/index.html
https://wayland.freedesktop.org/docs/html/apa.html
https://bugaevc.gitbooks.io/writing-wayland-clients/content/

main.c

#include <stdio.h>
#include <string.h>
#include <wayland-client.h>
   
struct wl_compositor *comp = NULL;
   
void cb_handle(void *dat, struct wl_registry *reg, uint32_t id, const char *intf, uint32_t ver)
{
    if (strcmp(intf, "wl_compositor") == 0) {
        comp = wl_registry_bind(reg, id, &wl_compositor_interface, 3);
    }
}
    
void cb_remove(void *dat, struct wl_registry *reg, uint32_t id)
{
}
    
int main(int argc, char **argv)
{
    struct wl_display *dis = wl_display_connect(NULL);
    struct wl_registry *reg = wl_display_get_registry(dis);
    struct wl_registry_listener cb = {
        .global = cb_handle,
        .global_remove = cb_remove
    };
    
    wl_registry_add_listener(reg, &cb, NULL);
    wl_display_dispatch(dis);
    wl_display_roundtrip(dis);
    printf("comp=0x%08x\n", comp);
    wl_display_disconnect(dis);
    return 0;
}

編譯、執行(WAYLAND_DEBUG=0)

$ gcc main.c -o main -lwayland-client
$ WAYLAND_DEBUG=0 ./main
    comp=0x0980b320

編譯、執行(WAYLAND_DEBUG=1)

$ gcc main.c -o main -lwayland-client
$ WAYLAND_DEBUG=1 ./main
    [2156106.030]  -> wl_display@1.get_registry(new id wl_registry@2)
    [2156107.746] wl_registry@2.global(1, "wl_compositor", 3)
    [2156108.187]  -> wl_registry@2.bind(1, "wl_compositor", 3, new id [unknown]@3)
    [2156108.299] wl_registry@2.global(2, "wl_data_device_manager", 1)
    [2156108.368] wl_registry@2.global(3, "wl_shm", 1)
    [2156108.434] wl_registry@2.global(4, "qt_hardware_integration", 1)
    [2156108.501] wl_registry@2.global(5, "android_wlegl", 2)
    [2156108.565] wl_registry@2.global(6, "qt_surface_extension", 1)
    [2156108.629] wl_registry@2.global(7, "qt_touch_extension", 1)
    [2156108.695] wl_registry@2.global(8, "qt_windowmanager", 1)
    [2156108.758] wl_registry@2.global(9, "wl_seat", 3)
    [2156108.925] wl_registry@2.global(10, "wl_output", 2)
    [2156109.101] wl_registry@2.global(11, "wl_shell", 1)
    [2156109.248] wl_registry@2.global(12, "lipstick_recorder_manager", 1)
    [2156109.317] wl_registry@2.global(13, "alien_manager", 1)
    [2156109.415]  -> wl_display@1.sync(new id wl_callback@4)
    [2156111.255] wl_display@1.delete_id(4)
    [2156111.465] wl_callback@4.done(11968)
    comp=0x178aa320