Hi Andria,
You can Poll from the User Space using "Handlers" as Preetam mentioned.
But "Polling" is bad. Instead you can use UEvents.
The ideal (Android) way would be:
1. Let your kernel module send an UEvent, whenever the alert raises.
This can be done by KOBJ_UEVENT(,,.,,)
2. Create a Simple Service in UserSpace that has an UEventObserver.
Register this Observer with your
KOBJ device path name.
You can have a look at android<http://www.google.com/codesearch#cZwlSNS7aEw/>
/frameworks
<http://www.google.com/codesearch#cZwlSNS7aEw/frameworks/>/base<http://www.google.com/codesearch#cZwlSNS7aEw/frameworks/base/&exact_package=android&q=battery%20Service>
/services<http://www.google.com/codesearch#cZwlSNS7aEw/frameworks/base/services/&exact_package=android&q=battery%20Service>
/java<http://www.google.com/codesearch#cZwlSNS7aEw/frameworks/base/services/java/&exact_package=android&q=battery%20Service>
/com<http://www.google.com/codesearch#cZwlSNS7aEw/frameworks/base/services/java/com/&exact_package=android&q=battery%20Service>
/android<http://www.google.com/codesearch#cZwlSNS7aEw/frameworks/base/services/java/com/android/&exact_package=android&q=battery%20Service>
/server<http://www.google.com/codesearch#cZwlSNS7aEw/frameworks/base/services/java/com/android/server/&exact_package=android&q=battery%20Service>
/BatteryService.java
to figure out how to use UEventObservers.
3. Whenever you send the UEvent, this Observer will be called by the
Android Framework. Inside the observer
code, you can broadCast an Intent to notify other Services/Apps, that can
raise a 'notification' or 'Toasts' or
'Alerts'.
Thanks,
Durga
On Thu, Nov 3, 2011 at 10:04 PM, preetam m.n <preeta...@gmail.com> wrote:
> as said below create a sysfs entries for the aleart.
>
> 1. for checking for the alert (it could be something like toggling the
> switch- saying true or 1 when you have a message and false or 0 when no
> message).
> 2. for message
>
> create a handler in the android stack to watch 1st sysfs entry to check
> for the aleart.
> create a intent observer which pops alert on the lcd. make sure the system
> by default registers for this intent.
> when a alert from kernel is given, you handler should be able to recognize
> it by realizing that the switch is toggled from false to true using cat the
> 2nd sysfs entry you can get the message content.
> immediately broadcast an intent to the registered observers and from there
> your observer should be able to pop and alert message on lcd.
>
> if you not keen of knowing the message from the kernel you can go ahead
> and create only one sysfs entry and use the same logic.
>
> - Preetam
>
>
> On Tue, Nov 1, 2011 at 8:11 PM, Tiago Maluta <tiago.mal...@gmail.com>wrote:
>
>> you can create a file [1] as a sysfs entry on your system, create a
>> android service pooling that information and display to user.
>>
>> [1] example: you can create a "notifications" file and put printk content.
>>
>> $ cat /sys/kernel/notifications
>> YOUR MESSAGE
>>
>> --tm
>>
>> On Fri, Oct 28, 2011 at 11:05 AM, andria <andri...@gmail.com> wrote:
>> > Hi,
>> >
>> > I work on a kernel module that sometimes raises an alert thanks to
>> > printk. I want to improve it by raising the alert in the user space
>> > like a notification in the status bar. Does anyone know how this can
>> > be done? One way to do it is to do like the sms notification because
>> > as far as I know there is something related to sms an call at kernel
>> > level but I don't know here exactly. So any idea?
>> >
>> > Thanks,
>> >
>> > Andria
>>
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>>
>
>
>
> --
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>
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Regards
Durgadoss
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