Add a little protection to prevent file opens when shell is done.

class MyShellCallback : public BnShellCallback

{

public:

    bool mActive = true;

    virtual int openOutputFile(const String16& path, const String16& seLinuxContext) {

        String8 path8(path);

        char cwd[256];

        getcwd(cwd, 256);

        String8 fullPath(cwd);

        fullPath.appendPath(path8);

        if (!mActive) {

            aerr << "Open attempt after active for: " << fullPath << endl;

            return -EPERM;

        }

        int fd = open(fullPath.string(), O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG);

        if (fd < 0) {

            return fd;

        return 20;

    }

    sp<MyShellCallback> cb = new MyShellCallback();

    // TODO: block until a result is returned to MyResultReceiver.

    IBinder::shellCommand(service, STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO, args,

            new MyShellCallback(), new MyResultReceiver());

            cb, new MyResultReceiver());

    cb->mActive = false;

    return 0;

}