Device Driver access via native functions called via JNI

[Sambhav]

Hi All,

 

I have a JavaClass which calls native C function via JNI.

Can these C function access the device drivers directly ?

 

Ex. I want to access /dev/video1 from the C function called via JNI. (This failed)

However in native C application I was able to access /dev/video1

 

Regards,

sambhav

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[Kelly]

"However in native C application I was able to access /dev/video1"

I think you meant 'wasn't'. You can check permissions by using the adb
shell and ls. I wouldn't hold much hope of having app level read
access to drivers on many or any devices.

Cheers

[Sambhav]

Thanks everyone. It worked after making #chmod 0777 /dev/video1 :)

[rajesh]

Hi sambav ,
I am trying to access chmod 0777 /dev/video1 . but i am uable to do it . so can you please suggest me how to use this and also whether can we get the video file from this ?

Thanks ,
Rajesh K

[Philippe Simons]

chmod 777 /dev/video1, is high security flaw.
It would allow any application to grab what's going on my display
(including password).

you need root permissions to read this file. of course that means you
need to root your device.

> To view this discussion on the web visit
> https://groups.google.com/d/msg/android-ndk/-/9RNhtITFPTkJ.

[Sangamanath Kalashetty]

hi simons,

Even I also faced the same problem when I was using the ALSA to
capture the audio on android device, but was able to access the device
when I rooted device, and was working fine. Do any one know how to
get the permission of the devices without rooting it.
It will be very helpful.

Thanking you in advance,
ksam