Hi,

Android has a UEvent Listener in the Application Framework.
This receives the UEvent from the Kernel.

For BatteryStatus:
You may want to look at
frameworks/base/services/java/com/android/server/BatteryService.java
Similarly, also at BatteryServer.cpp(corresponding JNI..)

Basically the battery service gets info from the JNI and packs them into an
intent
and broadcasts it. Intent : Action_Battery_Changed
You can register to listen this intent and extract every little detail from
this :)

BTW, Nothing stops you from writing a C program that can catch
the UEvents. You have to write a Netlink Socket receiver..in order to do
that.

Just Curious, Why you want to do that in C ?

[If you are Ok to that in Java, then its very simple & easy..]

On Mon, Jul 18, 2011 at 4:45 PM, Hemant <[email protected]> wrote:

> I want to handle uevent in user-space mainly for battery status
> changed in my application.
> Can this be done using C program?
> Can this be done by calling a select() on one of the sysfs which
> indicates change in battery voltage?
> How Android polls uevents from kernel?
>
> Br/
> Hvr
>
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-- 
Regards
Durgadoss

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