注册ubus事件代码示例

以下是一个简单的注册ubus事件的代码示例：

#include <stdio.h>
#include <libubox/uloop.h>
#include <libubox/blobmsg_json.h>
#include <libubus.h>

static struct ubus_context *ctx;

static void hello_handler(struct ubus_request *req, int type, struct blob_attr *msg)
{
    char *name = NULL;
    blobmsg_parse_string(&hello_policy, 1, &name, blob_data(msg), blob_len(msg));
    printf("Hello, %s!\n", name);
}

static const struct ubus_method hello_methods[] = {
    { .name = "hello", .handler = hello_handler },
};

static const struct ubus_object_type hello_object_type =
UBUS_OBJECT_TYPE("hello", hello_methods);

static struct ubus_object hello_object = {
    .name = "hello",
    .type = &hello_object_type,
    .methods = hello_methods,
    .n_methods = ARRAY_SIZE(hello_methods),
};

static void ubus_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
                   const char *type, struct blob_attr *msg)
{
    printf("Received ubus event: %s\n", type);
    /* do something with the event */
}

int main()
{
    int ret;
    struct ubus_event_handler event_handler = {
        .cb = ubus_event_handler
    };

    ctx = ubus_connect(NULL);
    if (!ctx) {
        fprintf(stderr, "Failed to connect to ubus\n");
        return 1;
    }

    ret = ubus_add_object(ctx, &hello_object);
    if (ret) {
        fprintf(stderr, "Failed to add ubus object\n");
        ubus_free(ctx);
        return 1;
    }

    ret = ubus_register_event_handler(ctx, &event_handler, "some_event");
    if (ret) {
        fprintf(stderr, "Failed to register ubus event handler\n");
        ubus_free(ctx);
        return 1;
    }

    uloop_run();

    ubus_free(ctx);
    return 0;
}

这个示例中，我们定义了一个名为“hello”的ubus对象，它有一个名为“hello”的方法。我们还定义了一个ubus事件处理程序“ubus_event_handler”，用于处理名为“some_event”的ubus事件。在main函数中，我们首先连接到ubus，然后将“hello”对象添加到ubus中，并注册名为“some_event”的ubus事件处理程序。最后，我们通过调用uloop_run()来进入主事件循环。在事件循环中，我们等待ubus事件的到来，然后调用我们的ubus事件处理程序来处理它们。