进程保护 监听文件是否存在

JNIClass.java

public class JNIClass {
    static {
        System.loadLibrary("loopjni");
    }


    public static native void createProcess(String pid);

    public void restartActivity() {
        try {
//            Runtime.getRuntime().exec("am start --user 0 -n com.example/com.droidwolf.example.WatchDogActivity");
            Runtime.getRuntime().exec("am start -n com.example.free.loopmonitorapp/com.example.free.loopmonitorapp.MainActivity");
        } catch (IOException e) {
            Log.e("JNIClass",  "restartActivity error: " + e);
        }
    }
}

loop.c

#define LOGTAG "loopjni"
#define LOG_D(tag, msg) __android_log_write(ANDROID_LOG_DEBUG, tag, msg)
#define LOG_PRINT_D(tag, msg, ...) __android_log_print(ANDROID_LOG_DEBUG, tag, msg, __VA_ARGS__)

int watch(char *pidnum) {
    char proc_path[100] = "";
    DIR *proc_dir;

    LOG_PRINT_D(LOGTAG, "watch start, pidnum: %s", pidnum);
    // 初始化进程目录
    strcpy(proc_path, "/proc/");
    strcat(proc_path, pidnum);
    strcat(proc_path, "/");

    LOG_PRINT_D(LOGTAG, "proccess path is: %s", proc_path);

    // 尝试访问它以确定是否存在
    proc_dir = opendir(proc_path);

    if (proc_dir == NULL) {
        LOG_PRINT_D(LOGTAG, "process: %s not exist! start it!", pidnum);
        LOG_D(LOGTAG, "---------------------");
        return 1;
    }
    else {
        LOG_PRINT_D(LOGTAG, "process: %s exist!", pidnum);
        LOG_D(LOGTAG, ".....................");
        return 0;
    }

}

void restart_target(JNIEnv *env) {
//    char cmd_restart[128] = "am startservice --user 0 -a com.a.b.service.YourService";
//    popen(cmd_restart, "r");
//    char cmd_restart[128] = "am start  -n "com.example.free.loopmonitorapp/com.example.free.loopmonitorapp.MainActivity
//                                           -a android.intent.action.MAIN -c android.intent.category.LAUNCHER";

    jclass clazz = (*env)->FindClass(env, "com/example/free/loopmonitorapp/JNIClass");
    jobject obj = (*env)->AllocObject(env, clazz);
    (*env)->CallVoidMethod(env, obj, (*env)->GetMethodID(env, clazz, "restartActivity", "()V"));
    (*env)->DeleteLocalRef(env, obj);
    LOG_D(LOGTAG, "restart process task....");
}


JNIEXPORT void JNICALL
Java_com_example_free_loopmonitorapp_JNIClass_createProcess(JNIEnv *env, jclass clazz,
                                                            jstring ppid) {
//    pid_t ppid = getpid();
    pid_t pid = fork();
    if (pid < 0) {
        LOG_D(LOGTAG, "create--fork failed!");
    } else if (pid == 0) {
        LOG_D(LOGTAG, "create--runOnSubprocess start...");
        runOnSubprocess(env, clazz, ppid);
        LOG_D(LOGTAG, "create--runOnSubprocess finished!");
        exit(1);
    } else {
        LOG_D(LOGTAG, "create--run on parent process!");
    }
}

void runOnSubprocess(JNIEnv *env, jclass clazz, jstring pid) {

    LOG_D(LOGTAG, "START LOOP MONITORING");
    const char *nativePid = (*env)->GetStringUTFChars(env, pid, 0);

    while (1) {
        if (watch(nativePid)) {
            restart_target(env);
            break;
        }
        sleep(3);
    }
    (*env)->ReleaseStringUTFChars(env, pid, nativePid);
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        JNIClass.createProcess(String.valueOf(android.os.Process.myPid()));
    }
}