static int publish_all_services(struct userdata *u) {
    pa_sink *sink;
    pa_source *source;
    int r = -1;
    uint32_t idx;

    pa_assert(u);

    pa_log_debug("Publishing services in Zeroconf");

    for (sink = PA_SINK(pa_idxset_first(u->core->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(u->core->sinks, &idx)))
        if (!shall_ignore(PA_OBJECT(sink)))
            publish_service(get_service(u, PA_OBJECT(sink)));

    for (source = PA_SOURCE(pa_idxset_first(u->core->sources, &idx)); source; source = PA_SOURCE(pa_idxset_next(u->core->sources, &idx)))
        if (!shall_ignore(PA_OBJECT(source)))
            publish_service(get_service(u, PA_OBJECT(source)));

    if (publish_main_service(u) < 0)
        goto fail;

    r = 0;

fail:
    return r;
}
static pa_hook_result_t device_new_or_changed_cb(pa_core *c, pa_object *o, struct userdata *u) {
    pa_assert(c);
    pa_object_assert_ref(o);

    if (!shall_ignore(o))
        publish_service(get_service(u, o));

    return PA_HOOK_OK;
}
static int publish_all_services(struct userdata *u) {
    pa_sink *sink;
    pa_source *source;
    uint32_t idx;

    pa_assert(u);

    pa_log_debug("Publishing services in Bonjour");

    for (sink = PA_SINK(pa_idxset_first(u->core->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(u->core->sinks, &idx)))
        if (!shall_ignore(PA_OBJECT(sink)))
            publish_service(get_service(u, PA_OBJECT(sink)));

    for (source = PA_SOURCE(pa_idxset_first(u->core->sources, &idx)); source; source = PA_SOURCE(pa_idxset_next(u->core->sources, &idx)))
        if (!shall_ignore(PA_OBJECT(source)))
            publish_service(get_service(u, PA_OBJECT(source)));

    return publish_main_service(u);
}
/* Runs in Avahi mainloop context */
static void service_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
    struct service *s = userdata;

    pa_assert(s);

    switch (state) {

        case AVAHI_ENTRY_GROUP_ESTABLISHED:
            pa_log_info("Successfully established service %s.", s->service_name);
            break;

        case AVAHI_ENTRY_GROUP_COLLISION: {
            char *t;

            t = avahi_alternative_service_name(s->service_name);
            pa_log_info("Name collision, renaming %s to %s.", s->service_name, t);
            pa_xfree(s->service_name);
            s->service_name = t;

            publish_service(NULL, s);
            break;
        }

        case AVAHI_ENTRY_GROUP_FAILURE: {
            pa_log("Failed to register service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));

            avahi_entry_group_free(g);
            s->entry_group = NULL;

            break;
        }

        case AVAHI_ENTRY_GROUP_UNCOMMITED:
        case AVAHI_ENTRY_GROUP_REGISTERING:
            ;
    }
}