ubus调试小结

1. ubus monitor

1.1 命令格式

ubus -m xxx monitor
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比如：ubus -m add_object monitor，就是监控add_object消息。

1.2 支持的类型

static const char * const monitor_types[] = {
	[UBUS_MSG_HELLO] = "hello",
	[UBUS_MSG_STATUS] = "status",
	[UBUS_MSG_DATA] = "data",
	[UBUS_MSG_PING] = "ping",
	[UBUS_MSG_LOOKUP] = "lookup",
	[UBUS_MSG_INVOKE] = "invoke",
	[UBUS_MSG_ADD_OBJECT] = "add_object",
	[UBUS_MSG_REMOVE_OBJECT] = "remove_object",
	[UBUS_MSG_SUBSCRIBE] = "subscribe",
	[UBUS_MSG_UNSUBSCRIBE] = "unsubscribe",
	[UBUS_MSG_NOTIFY] = "notify",
};
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2 ubus list

2.1 列出同类型的section

root@OpenWrt:/# ubus list network.interface.*
network.interface.WAN11
network.interface.lan
network.interface.loopback
network.interface.wan
network.interface.wan6
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3 系统自带ubus

3.1 hotplug

系统默认创建了如下ubus服务：

hotplug.dhcp
hotplug.ieee80211
hotplug.iface
hotplug.neigh
hotplug.net
hotplug.ntp
hotplug.tftp
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3.1.1 初始化

/etc/hotplug.d下的目录名，在如下流程中初始化对应的ubus服务，也就是"ubus list"看到的hotplug.xxx

ubus_connect_cb->ubus_init_hotplug->init_subsystems->add_subsystem
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