/**
 * srvname 進(jìn)程名
 * sd 之前創(chuàng)建子進(jìn)程的pid寫入的文件路徑
 */
int start(int argc, char* srvname, char* sd) {
 pthread_t id;
 int ret;
 struct rlimit r;

 int pid = fork();
 LOGI("fork pid: %d", pid);
 if (pid < 0) {
 LOGI("first fork() error pid %d,so exit", pid);
 exit(0);
 } else if (pid != 0) {
 LOGI("first fork(): I'am father pid=%d", getpid());
 //exit(0);
 } else { // 第一個(gè)子進(jìn)程
 LOGI("first fork(): I'am child pid=%d", getpid());
 setsid();
 LOGI("first fork(): setsid=%d", setsid());
 umask(0); //為文件賦予更多的權(quán)限，因?yàn)槔^承來的文件可能某些權(quán)限被屏蔽

 int pid = fork();
 if (pid == 0) { // 第二個(gè)子進(jìn)程
 // 這里實(shí)際上為了防止重復(fù)開啟線程，應(yīng)該要有相應(yīng)處理

 LOGI("I'am child-child pid=%d", getpid());
 chdir("/"); //<span style="font-family: Arial, Helvetica, sans-serif;">修改進(jìn)程工作目錄為根目錄，chdir(“/”)</span>
 //關(guān)閉不需要的從父進(jìn)程繼承過來的文件描述符。
 if (r.rlim_max == RLIM_INFINITY) {
 r.rlim_max = 1024;
 }
 int i;
 for (i = 0; i < r.rlim_max; i++) {
 close(i);
 }

 umask(0);
 ret = pthread_create(&id, NULL, (void *) thread, srvname); // 開啟線程，輪詢?nèi)ケO(jiān)聽啟動(dòng)服務(wù)
 if (ret != 0) {
 printf("Create pthread error!\n");
 exit(1);
 }
 int stdfd = open ("/dev/null", O_RDWR);
 dup2(stdfd, STDOUT_FILENO);
 dup2(stdfd, STDERR_FILENO);
 } else {
 exit(0);
 }
 }
 return 0;
}

/**
 * 啟動(dòng)Service
 */
void Java_com_yyh_fork_NativeRuntime_startService(JNIEnv* env, jobject thiz,
 jstring cchrptr_ProcessName, jstring sdpath) {
 char * rtn = jstringTostring(env, cchrptr_ProcessName); // 得到進(jìn)程名稱
 char * sd = jstringTostring(env, sdpath);
 LOGI("Java_com_yyh_fork_NativeRuntime_startService run....ProcessName:%s", rtn);
 a = rtn;
 start(1, rtn, sd);
}

void thread(char* srvname) {
 while(1){
 check_and_restart_service(srvname); // 應(yīng)該要去判斷service狀態(tài)，這里一直restart 是不足之處
 sleep(4);
 }
}

/**
 * 檢測服務(wù)，如果不存在服務(wù)則啟動(dòng).
 * 通過am命令啟動(dòng)一個(gè)laucher服務(wù),由laucher服務(wù)負(fù)責(zé)進(jìn)行主服務(wù)的檢測,laucher服務(wù)在檢測后自動(dòng)退出
 */
void check_and_restart_service(char* service) {
 LOGI("當(dāng)前所在的進(jìn)程pid=",getpid());
 char cmdline[200];
 sprintf(cmdline, "am startservice --user 0 -n %s", service);
 char tmp[200];
 sprintf(tmp, "cmd=%s", cmdline);
 ExecuteCommandWithPopen(cmdline, tmp, 200);
 LOGI( tmp, LOG);
}  

/**
 * 執(zhí)行命令
 */
void ExecuteCommandWithPopen(char* command, char* out_result,
 int resultBufferSize) {
 FILE * fp;
 out_result[resultBufferSize - 1] = '\0';
 fp = popen(command, "r");
 if (fp) {
 fgets(out_result, resultBufferSize - 1, fp);
 out_result[resultBufferSize - 1] = '\0';
 pclose(fp);
 } else {
 LOGI("popen null,so exit");
 exit(0);
 }
}

package com.yyh.fork;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;

public class NativeRuntime {

 private static NativeRuntime theInstance = null;

 private NativeRuntime() {

 }
 
 public static NativeRuntime getInstance() {
 if (theInstance == null)
 theInstance = new NativeRuntime();
 return theInstance;
 }

 /**
 * RunExecutable 啟動(dòng)一個(gè)可自行的lib*.so文件
 * @date 2016-1-18 下午8:22:28
 * @param pacaageName
 * @param filename
 * @param alias 別名
 * @param args 參數(shù)
 * @return
 */
 public String RunExecutable(String pacaageName, String filename, String alias, String args) {
 String path = "/data/data/" + pacaageName;
 String cmd1 = path + "/lib/" + filename;
 String cmd2 = path + "/" + alias;
 String cmd2_a1 = path + "/" + alias + " " + args;
 String cmd3 = "chmod 777 " + cmd2;
 String cmd4 = "dd if=" + cmd1 + " of=" + cmd2;
 StringBuffer sb_result = new StringBuffer();

 if (!new File("/data/data/" + alias).exists()) {
 RunLocalUserCommand(pacaageName, cmd4, sb_result); // 拷貝lib/libtest.so到上一層目錄,同時(shí)命名為test.
 sb_result.append(";");
 }
 RunLocalUserCommand(pacaageName, cmd3, sb_result); // 改變test的屬性,讓其變?yōu)榭蓤?zhí)行
 sb_result.append(";");
 RunLocalUserCommand(pacaageName, cmd2_a1, sb_result); // 執(zhí)行test程序.
 sb_result.append(";");
 return sb_result.toString();
 }

 /**
 * 執(zhí)行本地用戶命令
 * @date 2016-1-18 下午8:23:01
 * @param pacaageName
 * @param command
 * @param sb_out_Result
 * @return
 */
 public boolean RunLocalUserCommand(String pacaageName, String command, StringBuffer sb_out_Result) {
 Process process = null;
 try {
 process = Runtime.getRuntime().exec("sh"); // 獲得shell進(jìn)程
 DataInputStream inputStream = new DataInputStream(process.getInputStream());
 DataOutputStream outputStream = new DataOutputStream(process.getOutputStream());
 outputStream.writeBytes("cd /data/data/" + pacaageName + "\n"); // 保證在command在自己的數(shù)據(jù)目錄里執(zhí)行,才有權(quán)限寫文件到當(dāng)前目錄
 outputStream.writeBytes(command + " &\n"); // 讓程序在后臺(tái)運(yùn)行，前臺(tái)馬上返回
 outputStream.writeBytes("exit\n");
 outputStream.flush();
 process.waitFor();
 byte[] buffer = new byte[inputStream.available()];
 inputStream.read(buffer);
 String s = new String(buffer);
 if (sb_out_Result != null)
 sb_out_Result.append("CMD Result:\n" + s);
 } catch (Exception e) {
 if (sb_out_Result != null)
 sb_out_Result.append("Exception:" + e.getMessage());
 return false;
 }
 return true;
 }

 public native void startActivity(String compname);

 public native String stringFromJNI();

 public native void startService(String srvname, String sdpath);

 public native int findProcess(String packname);

 public native int stopService();

 static {
 try {
 System.loadLibrary("helper"); // 加載so庫
 } catch (Exception e) {
 e.printStackTrace();
 }
 }

}

package com.yyh.activity;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

import com.yyh.fork.NativeRuntime;
import com.yyh.utils.FileUtils;
public class PhoneStatReceiver extends BroadcastReceiver {

 private String TAG = "tag";

 @Override
 public void onReceive(Context context, Intent intent) {
 if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
 Log.i(TAG, "手機(jī)開機(jī)了~~");
 NativeRuntime.getInstance().startService(context.getPackageName() + "/com.yyh.service.HostMonitor", FileUtils.createRootPath());
 } else if (Intent.ACTION_USER_PRESENT.equals(intent.getAction())) {
 }
 }

 
}

package com.yyh.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

public class HostMonitor extends Service {

 @Override
 public void onCreate() {
 super.onCreate();
 Log.i("daemon_java", "HostMonitor: onCreate! I can not be Killed!");
 }

 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
 Log.i("daemon_java", "HostMonitor: onStartCommand! I can not be Killed!");
 return super.onStartCommand(intent, flags, startId);
 }

 @Override
 public IBinder onBind(Intent arg0) {
 return null;
 }
}

<receiver
   android:name="com.yyh.activity.PhoneStatReceiver"
   android:enabled="true"
   android:permission="android.permission.RECEIVE_BOOT_COMPLETED" >
   <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
    <action android:name="android.intent.action.USER_PRESENT" />
   </intent-filter>
  </receiver>
  
  <service android:name="com.yyh.service.HostMonitor"
    android:enabled="true"
    android:exported="true">
   </service>