Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2011 Adam Shanks (ChainsDD)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

import android.util.Log;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    private static final String TAG = "Su.Util";

    public static String getSuVersion() {
        Process process = null;
        String inLine = null;

        try {
            process = Runtime.getRuntime().exec("sh");
            DataOutputStream os = new DataOutputStream(process.getOutputStream());
            BufferedReader is = new BufferedReader(
                    new InputStreamReader(new DataInputStream(process.getInputStream())), 64);
            os.writeBytes("su -v\n");

            // We have to hold up the thread to make sure that we're ready to read
            // the stream, using increments of 5ms makes it return as quick as
            // possible, and limiting to 1000ms makes sure that it doesn't hang for
            // too long if there's a problem.
            for (int i = 0; i < 400; i++) {
                if (is.ready()) {
                    break;
                }
                try {
                    Thread.sleep(5);
                } catch (InterruptedException e) {
                    Log.w(TAG, "Sleep timer got interrupted...");
                }
            }
            if (is.ready()) {
                inLine = is.readLine();
                if (inLine != null) {
                    return inLine;
                }
            } else {
                os.writeBytes("exit\n");
            }
        } catch (IOException e) {
            Log.e(TAG, "Problems reading current version.", e);
            return null;
        } finally {
            if (process != null) {
                process.destroy();
            }
        }

        return null;
    }
}