wpa_supplicant 启动流程（AIDL）

wpa_supplicant AIDL service的启动流程，这里直接从startSupplicant开始

中间没什么好说的，在getSupplicantMockable中会调用ServiceManager.waitForDeclaredService(HAL_INSTANCE_NAME))，它会启动AIDL service并返回IBinder对象

    packages/modules/Wifi/service/java/com/android/server/wifi/SupplicantStaIfaceHalAidlImpl.java
    
    protected ISupplicant getSupplicantMockable() {
        synchronized (mLock) {
            try {
                if (SdkLevel.isAtLeastT()) {
                    return ISupplicant.Stub.asInterface(
                            ServiceManager.waitForDeclaredService(HAL_INSTANCE_NAME));
                } else {
                    return null;
                }
            } catch (Exception e) {
                Log.e(TAG, "Unable to get ISupplicant service, " + e);
                return null;
            }
        }
    }

wpa_supplicant AIDL service的注册是在 aidl_manager.cpp中的registerAidlService中完成的。

int AidlManager::registerAidlService(struct wpa_global *global)
{
	// Create the main aidl service object and register it.
	wpa_printf(MSG_INFO, "Starting AIDL supplicant");
	wpa_printf(MSG_INFO, "Interface version: %d", Supplicant::version);
	supplicant_object_ = ndk::SharedRefBase::make<Supplicant>(global);
	wpa_global_ = global;
	std::string instance = std::string() + Supplicant::descriptor + "/default";
	if (AServiceManager_addService(supplicant_object_->asBinder().get(),//在这里进行注册
			instance.c_str()) != STATUS_OK)
	{
		return 1;
	}

	// Initialize the death notifier.
	death_notifier_ = AIBinder_DeathRecipient_new(onDeath);
	return 0;
}