C++ sd_bus_message_append函数代码示例

static int property_get_what(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Mount *m = userdata;
        const char *d;

        assert(bus);
        assert(reply);
        assert(m);

        if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what)
                d = m->parameters_proc_self_mountinfo.what;
        else if (m->from_fragment && m->parameters_fragment.what)
                d = m->parameters_fragment.what;
        else
                d = "";

        return sd_bus_message_append(reply, "s", d);
}

static int transient_kill_set_properties(sd_bus_message *m) {
    assert(m);

    if (arg_send_sighup)
        return sd_bus_message_append(m, "(sv)", "SendSIGHUP", "b", arg_send_sighup);
    else
        return 0;
}

static int get_group_property(sd_bus *bus, const char *path,
		const char *interface, const char *property, sd_bus_message *reply,
		void *userdata, sd_bus_error *error) {

	struct dmmp_path_group *group = userdata;

	if (strcmp(property, GROUP_ID) == 0)
		return sd_bus_message_append(reply, "u", dmmp_path_group_id_get(group));

	if (strcmp(property, GROUP_PRIORITY) == 0)
		return sd_bus_message_append(reply, "u", dmmp_path_group_priority_get(group));

	if (strcmp(property, GROUP_STATUS) == 0)
		return sd_bus_message_append(reply, "s", dmmp_path_group_status_str(
				dmmp_path_group_status_get(group)));

	// TODO deal with error
	return -1;
}

static void client_chart(const char *address) {
        _cleanup_bus_message_unref_ sd_bus_message *x = NULL;
        size_t csize;
        sd_bus *b;
        int r;

        r = sd_bus_new(&b);
        assert_se(r >= 0);

        r = sd_bus_set_address(b, address);
        assert_se(r >= 0);

        r = sd_bus_start(b);
        assert_se(r >= 0);

        assert_se(sd_bus_call_method(b, ":1.1", "/", "benchmark.server", "Ping", NULL, NULL, NULL) >= 0);

        printf("SIZE\tCOPY\tMEMFD\n");

        for (csize = 1; csize <= MAX_SIZE; csize *= 2) {
                usec_t t;
                unsigned n_copying, n_memfd;

                printf("%zu\t", csize);

                b->use_memfd = 0;

                t = now(CLOCK_MONOTONIC);
                for (n_copying = 0;; n_copying++) {
                        transaction(b, csize);
                        if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
                                break;
                }

                printf("%u\t", (unsigned) ((n_copying * USEC_PER_SEC) / arg_loop_usec));

                b->use_memfd = -1;

                t = now(CLOCK_MONOTONIC);
                for (n_memfd = 0;; n_memfd++) {
                        transaction(b, csize);
                        if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
                                break;
                }

                printf("%u\n", (unsigned) ((n_memfd * USEC_PER_SEC) / arg_loop_usec));
        }

        b->use_memfd = 1;
        assert_se(sd_bus_message_new_method_call(b, ":1.1", "/", "benchmark.server", "Exit", &x) >= 0);
        assert_se(sd_bus_message_append(x, "t", csize) >= 0);
        assert_se(sd_bus_send(b, x, NULL) >= 0);

        sd_bus_unref(b);
}

static int get_handler(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) {
        struct context *c = userdata;
        int r;

        log_info("property get for %s called, returning \"%s\".", property, c->something);

        r = sd_bus_message_append(reply, "s", c->something);
        assert_se(r >= 0);

        return 1;
}

static struct ipmi_rs *ipmi_dbus_sendrecv(struct ipmi_intf *intf,
		struct ipmi_rq *req)
{
	sd_bus_message *msg;
	int rc;

	(void)intf;

	rsp.ccode = 0xff;

	rc = sd_bus_message_new_signal(bus, &msg, object_path,
			interface, "ReceivedMessage");
	if (rc < 0) {
		lprintf(LOG_ERR, "%s: failed to create message: %s\n",
				__func__, strerror(-rc));
		goto out;
	}

	rc = sd_bus_message_append(msg, "yyyy",
			++seq,
			req->msg.netfn,
			req->msg.lun,
			req->msg.cmd);
	if (rc < 0) {
		lprintf(LOG_ERR, "%s: failed to init bytes\n", __func__);
		goto out_free;
	}

	rc = sd_bus_message_append_array(msg, 'y', req->msg.data,
			req->msg.data_len);
	if (rc < 0) {
		lprintf(LOG_ERR, "%s: failed to init body\n", __func__);
		goto out_free;
	}

	rc = sd_bus_send(bus, msg, NULL);
	if (rc < 0) {
		lprintf(LOG_ERR, "%s: failed to send dbus message\n",
				__func__);
		goto out_free;
	}

	for (reply_received = false; !reply_received;) {
		rc = sd_bus_wait(bus, -1);
		sd_bus_process(bus, NULL);
	}

out_free:
	sd_bus_message_unref(msg);
out:
	return &rsp;
}

static int transient_unit_set_properties(sd_bus_message *m, char **properties) {
        char **i;
        int r;

        r = sd_bus_message_append(m, "(sv)", "Description", "s", arg_description);
        if (r < 0)
                return r;

        STRV_FOREACH(i, properties) {
                r = bus_append_unit_property_assignment(m, *i);
                if (r < 0)
                        return r;
        }

int bus_property_get_tristate(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        int *tristate = userdata;

        return sd_bus_message_append(reply, "b", *tristate > 0);
}

static int transient_unit_set_properties(sd_bus_message *m, char **properties) {
    int r;

    r = sd_bus_message_append(m, "(sv)", "Description", "s", arg_description);
    if (r < 0)
        return r;

    r = bus_append_unit_property_assignment_many(m, properties);
    if (r < 0)
        return r;

    return 0;
}

_public_ int sd_bus_set_property(
                sd_bus *bus,
                const char *destination,
                const char *path,
                const char *interface,
                const char *member,
                sd_bus_error *error,
                const char *type, ...) {

        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
        va_list ap;
        int r;

        bus_assert_return(bus, -EINVAL, error);
        bus_assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL, error);
        bus_assert_return(member_name_is_valid(member), -EINVAL, error);
        bus_assert_return(signature_is_single(type, false), -EINVAL, error);
        bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);

        if (!BUS_IS_OPEN(bus->state)) {
                r = -ENOTCONN;
                goto fail;
        }

        r = sd_bus_message_new_method_call(bus, &m, destination, path, "org.freedesktop.DBus.Properties", "Set");
        if (r < 0)
                goto fail;

        r = sd_bus_message_append(m, "ss", strempty(interface), member);
        if (r < 0)
                goto fail;

        r = sd_bus_message_open_container(m, 'v', type);
        if (r < 0)
                goto fail;

        va_start(ap, type);
        r = sd_bus_message_appendv(m, type, ap);
        va_end(ap);
        if (r < 0)
                goto fail;

        r = sd_bus_message_close_container(m);
        if (r < 0)
                goto fail;

        return sd_bus_call(bus, m, 0, error, NULL);

fail:
        return sd_bus_error_set_errno(error, r);
}

static int transient_timer_set_properties(sd_bus_message *m) {
    int r;

    assert(m);

    r = transient_unit_set_properties(m, arg_timer_property);
    if (r < 0)
        return r;

    /* Automatically clean up our transient timers */
    r = sd_bus_message_append(m, "(sv)", "RemainAfterElapse", "b", false);
    if (r < 0)
        return r;

    if (arg_on_active) {
        r = sd_bus_message_append(m, "(sv)", "OnActiveSec", "t", arg_on_active);
        if (r < 0)
            return r;
    }

    if (arg_on_boot) {
        r = sd_bus_message_append(m, "(sv)", "OnBootSec", "t", arg_on_boot);
        if (r < 0)
            return r;
    }

    if (arg_on_startup) {
        r = sd_bus_message_append(m, "(sv)", "OnStartupSec", "t", arg_on_startup);
        if (r < 0)
            return r;
    }

    if (arg_on_unit_active) {
        r = sd_bus_message_append(m, "(sv)", "OnUnitActiveSec", "t", arg_on_unit_active);
        if (r < 0)
            return r;
    }

    if (arg_on_unit_inactive) {
        r = sd_bus_message_append(m, "(sv)", "OnUnitInactiveSec", "t", arg_on_unit_inactive);
        if (r < 0)
            return r;
    }

    if (arg_on_calendar) {
        r = sd_bus_message_append(m, "(sv)", "OnCalendar", "s", arg_on_calendar);
        if (r < 0)
            return r;
    }

    return 0;
}

static int value_handler(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *s = NULL;
        const char *x;
        int r;

        assert_se(asprintf(&s, "object %p, path %s", userdata, path) >= 0);
        r = sd_bus_message_append(reply, "s", s);
        assert_se(r >= 0);

        assert_se(x = startswith(path, "/value/"));

        assert_se(PTR_TO_UINT(userdata) == 30);

        return 1;
}

int cc_Calculator_split_async(
    struct cc_client_Calculator *instance, double value,
    cc_Calculator_split_reply_t callback)
{
    int result = 0;
    struct cc_instance *i;
    sd_bus_message *message = NULL;

    CC_LOG_DEBUG("invoked cc_Calculator_split_async()\n");
    assert(instance);
    assert(callback);
    i = instance->instance;
    assert(i && i->backend && i->backend->bus);
    assert(i->service && i->path && i->interface);

    if (instance->split_reply_slot) {
        CC_LOG_ERROR("unable to call method with already pending reply\n");
        return -EBUSY;
    }
    assert(!instance->split_reply_callback);

    result = sd_bus_message_new_method_call(
        i->backend->bus, &message, i->service, i->path, i->interface, "split");
    if (result < 0) {
        CC_LOG_ERROR("unable to create message: %s\n", strerror(-result));
        goto fail;
    }
    result = sd_bus_message_append(message, "d", value);
    if (result < 0) {
        CC_LOG_ERROR("unable to append message method arguments: %s\n", strerror(-result));
        goto fail;
    }

    result = sd_bus_call_async(
        i->backend->bus, &instance->split_reply_slot, message,
        &cc_Calculator_split_reply_thunk, instance, CC_DBUS_ASYNC_CALL_TIMEOUT_USEC);
    if (result < 0) {
        CC_LOG_ERROR("unable to issue method call: %s\n", strerror(-result));
        goto fail;
    }
    instance->split_reply_callback = callback;

fail:
    message = sd_bus_message_unref(message);

    return result;
}

static int append_controller_property(sd_bus *bus, sd_bus_message *m) {
        const char *unique;
        int r;

        assert(bus);
        assert(m);

        r = sd_bus_get_unique_name(bus, &unique);
        if (r < 0)
                return log_error_errno(r, "Failed to get unique name: %m");

        r = sd_bus_message_append(m, "(sv)", "Controller", "s", unique);
        if (r < 0)
                return bus_log_create_error(r);

        return 0;
}

int main(int argc, char *argv[]) {
    struct bus_match_node root = {
        .type = BUS_MATCH_ROOT,
    };

    _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
    _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
    enum bus_match_node_type i;
    sd_bus_slot slots[19];
    int r;

    r = sd_bus_open_system(&bus);
    if (r < 0)
        return EXIT_TEST_SKIP;

    assert_se(match_add(slots, &root, "arg2='wal\\'do',sender='foo',type='signal',interface='bar.x',", 1) >= 0);
    assert_se(match_add(slots, &root, "arg2='wal\\'do2',sender='foo',type='signal',interface='bar.x',", 2) >= 0);
    assert_se(match_add(slots, &root, "arg3='test',sender='foo',type='signal',interface='bar.x',", 3) >= 0);
    assert_se(match_add(slots, &root, "arg3='test',sender='foo',type='method_call',interface='bar.x',", 4) >= 0);
    assert_se(match_add(slots, &root, "", 5) >= 0);
    assert_se(match_add(slots, &root, "interface='quux.x'", 6) >= 0);
    assert_se(match_add(slots, &root, "interface='bar.x'", 7) >= 0);
    assert_se(match_add(slots, &root, "member='waldo',path='/foo/bar'", 8) >= 0);
    assert_se(match_add(slots, &root, "path='/foo/bar'", 9) >= 0);
    assert_se(match_add(slots, &root, "path_namespace='/foo'", 10) >= 0);
    assert_se(match_add(slots, &root, "path_namespace='/foo/quux'", 11) >= 0);
    assert_se(match_add(slots, &root, "arg1='two'", 12) >= 0);
    assert_se(match_add(slots, &root, "member='waldo',arg2path='/prefix/'", 13) >= 0);
    assert_se(match_add(slots, &root, "member=waldo,path='/foo/bar',arg3namespace='prefix'", 14) >= 0);
    assert_se(match_add(slots, &root, "arg4has='pi'", 15) >= 0);
    assert_se(match_add(slots, &root, "arg4has='pa'", 16) >= 0);
    assert_se(match_add(slots, &root, "arg4has='po'", 17) >= 0);
    assert_se(match_add(slots, &root, "arg4='pi'", 18) >= 0);

    bus_match_dump(&root, 0);

    assert_se(sd_bus_message_new_signal(bus, &m, "/foo/bar", "bar.x", "waldo") >= 0);
    assert_se(sd_bus_message_append(m, "ssssas", "one", "two", "/prefix/three", "prefix.four", 3, "pi", "pa", "po") >= 0);
    assert_se(bus_message_seal(m, 1, 0) >= 0);

    zero(mask);
    assert_se(bus_match_run(NULL, &root, m) == 0);
    assert_se(mask_contains((unsigned[]) {
        9, 8, 7, 5, 10, 12, 13, 14, 15, 16, 17
    }, 11));