How to capture/log Android phone reboot cause

[Jitesh dedhiya]

Hi All,

While developing my android custom ROM, I need to know that - is there
a way to log or capture the cause of android reboot, whether user
manually powered off / rebooted the devices or wether system_server
got restarted by adb kill or it was watchdog who restarted the device.



Help Appreciated !
Thanks

--
--Jitesh .V. Dedhiya---

Don't Learn To Hack but Hack To Learn

[shridutt kothari]

Hi Jitesh,

For any Reboot or Shutdown or restart of system_server ShutdownThread is invoked, which contains reason for shutdown or reboot so you can get the reason from there and do anything with it, i.e. log it or write it to file etc.

see rebootReason and methods of ShutdownThread, for each reboot or shutdown run() method of ShutdownThread is internally invoked which internally calls rebootOrShutDown() method (which should not be called from anywhere else also).

Thanks,

Shridutt Kothari

Impetus Infotech India Ltd.

shridut...@gmail.co.in

[Ron Munitz]

Logcat should get you through.
So do the trace file and the tombstone file.

adb kill-server has nothing to do with it.
If you kill something from the shell,  it depends on the signal type.

You will find all "watchdog" related events in the log,  and if you customize your own ROM, and want to ease the finding of those events, you can add a single line to the zygotte block of your init.rc

-Ron Munitz

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[Abdul Haseeb]

adb shell cat /proc/last_kmsg  should give you the messages that gets missed from adb .
You can monitor the serial console logs too.

From logcat you can look in Shutdown Thread for reboot reason, if its soft/hard reboot.

If reboot is due to crash you can rely on pstore/last_kmsg/serial logs.

Hope that helps.

[Hieu Dinh Van]

Vào 13:19:18 UTC+7 Thứ ba, ngày 10 tháng sáu năm 2014, Dev Droid đã viết:

Hi

I think it is useful for you : https://groups.google.com/forum/#!searchin/android-platform/how$20can$20diagnose/android-platform/VVHA6-eRB3c/v9S6JSXiTp0J

You need read comment from Christopher Tage.

I think you can found cause of auto reboot.

Good luck.

[Balaji BABU T.R.]

Hi Jitesh,

Below procedure

1) cat /proc/kmsg

2) dmesg

3) data /dontpanic

4) In windows PC using Teraterm or Linux pc using Minicom --> for checking the kernel log..

Regards

Balaji Babu