[android-developers] Root permission for application

Shall we give root permissions for android application?
My requirement is i want to execute a c program using jni
That contains some functions like umount etc.
I tried in the following way
static{
System.loadLibrary("myjni");
}
Process p=Runtime.getRuntime().exec("su");
int value=getValue();

where getValue() is a native method contains umount() function call.
But this is returning -1 means permissions problem

Any help

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