android分析手机唤醒源

一、唤醒源

我们可以先从kernel的log看唤醒源：

exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 utc 02:55:43
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000  02:56:00
exit comip suspend by modem 0x00000000|0x00000000|0x00010000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 02:56:32
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 02:57:36
exit comip suspend by gpio99    10:57:41
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 02:57:41
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 02:59:43
exit comip suspend by gpio99   11:01:33
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by modem 0x00000004|0x00000000|0x00000000|0x00000000 
exit comip suspend by gpio99   11:04:40 按power键

时间的话可以根据utc时间+8小时算出

二、AP侧主动唤醒

像gpio99这种是ap侧的唤醒，

既然ap侧唤醒我们再去看对应的Framework的log

10:57:41.018415   889  1086 V AlarmManager: sending alarm Alarm{8afbde3 type 0 when 1459997860411 android} ...
	
11:01:33.022557   889  1086 V AlarmManager: sending alarm Alarm{696553f type 2 when 695348 com.android.phone}...

11:04:40.023738   889  1093 I WindowManager: PowerKey down, interactive = false
...
04-07 11:04:40.031768   889  1093 I PowerManagerService: Waking up from sleep (uid 1000)...
04-07 11:04:40.033560   889   889 I WindowManager: Started waking up...

果然在10:57:41、11:01:33有两个alarm唤醒，alarm唤醒主要搜sending，但是一定要注意type为0，2才是唤醒的alarm。

另外11:04:40是power按键唤醒

三、modem唤醒源

而modem的唤醒，ap侧这边能分析什么呢？因为modem一般是有网络数据过来，才把AP侧唤醒，因此我们可以看tcp的数据包，对照时间来看这个唤醒的点，有哪些服务器的数据包发送过来。

我们可以使用Wireshark这个软件分析数据包。

步骤如下：

打开cap文件，先使用“ip.addr==”来过滤出这个ip地址的收发业务，然后用“Follow TCP stream”来做汇总，弹出的对话框中一般在头上会有一些访问的host等信息，再结合百度去搜，基本就能确定了是什么服务器发过来的数据；
我们结合唤醒点的时间，然后看这个点的数据包，就能看是哪个服务器发送数据过来，导致modem唤醒AP。