I am trying to run shell commands from a system/priv-app I have added to the AOSP (7.1.1)
The command I am trying to run is: ip link add dev can0 type can to switch on the can bus.
I have build the image as both -eng & -userdebug releases.
The command runs fine in the adb shell and successfully switches on the CAN bus as expected.
My problem is that I get the following error: Cannot run program "su": error=13, Permission denied
When I try the following code within the system privileged java app:
//ArrayList<String> commands is passed into the method
try {
if (null != commands && commands.size() > 0) {
Process suProcess = Runtime.getRuntime().exec("su");
DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
for (String currCommand : commands) {
os.writeBytes(currCommand + "\n");
os.flush();
}
os.writeBytes("exit\n");
os.flush();
BufferedReader stderr = new BufferedReader(new InputStreamReader(suProcess.getErrorStream()));
String line = "";
String errString = "";
while ((line = stderr.readLine()) != null) errString += line + "\n";
suProcess.waitFor();
if (suProcess.exitValue() != 0)
throw new Exception(errString);
} //Handle exception
