[Android4.4]NetworkManagementService与Netd交互流程

接收netd事件流程：

NetworkManagementService.create -> SystemServer.java

create -> //socket name 是NETD_SOCKET_NAME，即netd

new NetworkManagementService ->

new NativeDaemonConnector -> //NativeDaemonConnector.java 参数有个new NetdCallbackReceiver,当此类和netd建立socket通信时，会调用此callback

new Thread //把NativeDaemonConnector放到thread中去跑

run ->

new Handler //会用到其消息机制

listenToSocket ->

new LocalSocket

socket.connect

mCallbacks.onDaemonConnected //socket建立后就调用它

onDaemonConnected //NetworkManagementService.java

inputStream.read //循环监听socket netd过来的事件，有事件就读取

mCallbackHandler.sendMessage ->

handleMessage -> //NativeDaemonConnector.java

mCallbacks.onEvent ->

onEvent //NetworkManagementService.java处理各种事件

发送命令给netd:

比如拿stopAccessPoint为例：

stopAccessPoint -> //NetworkManagementService.java

mConnector.execute -> //cmd为softap stopap

execute -> //NativeDaemonConnector.java

mOutputStream.write -> //mOutputStream在上面提到的listenToSocket建立，也是基于netd socket的，所以会触发netd socket接收事件

SocketListener::startListener -> //注意这里已经在另一个进程了

listen

pthread_create //创建线程，执行SocketListener::threadStart

me->runListener ->

select

accept

onDataAvailable ->

FrameworkListener::onDataAvailable ->

dispatchCommand ->

c->runCommand ->

CommandListener::SoftapCmd::runCommand ->

sSoftapCtrl->stopSoftap ->

kill