从连接速度来看下获取WiFi信息的流程
public int getLinkSpeed() {
return mLinkSpeed; } mLinkSpeed在fetchRssiLinkSpeedAndFrequencyNative()得到 fetchRssiLinkSpeedAndFrequencyNative -> WifiStateMachine.java mWifiNative.signalPoll -> doStringCommandWithoutLogging -> //cmd: SIGNAL_POLL doStringCommandNative -> //通过socket发给WPAS处理 android_net_wifi_doStringCommand -> doStringCommand -> wpa_supplicant_ctrl_iface_receive -> Ctrl_iface_unix.c //WPAS端socket接收处理函数 wpa_supplicant_ctrl_iface_process -> Ctrl_iface.c wpa_supplicant_signal_poll -> wpa_drv_signal_poll -> wpa_s->driver->signal_poll -> nl80211_signal_poll -> Driver_nl80211.c nl80211_get_link_signal -> nl80211_drv_msg //msg的flag是NL80211_CMD_GET_STATION send_and_recv_msgs -> //通过netlink发送给kernel driver,回调函数是get_link_signal(),用来解析收到的packet nl80211_get_station -> nl80211.c //driver中对应的操作函数集在nl80211_ops中，这里是nl80211_get_station rdev_get_station -> rdev->ops->get_station -> wl_cfg80211_get_station -> Wl_cfg80211.c wldev_ioctl //cmd是WLC_GET_RATE