1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.os; 18 19 import android.net.LocalSocketAddress; 20 import android.system.ErrnoException; 21 import android.system.Os; 22 23 import java.util.concurrent.atomic.AtomicBoolean; 24 25 /** 26 * Represents a connection to a child-zygote process. A child-zygote is spawend from another 27 * zygote process using {@link startChildZygote()}. 28 * 29 * {@hide} 30 */ 31 public class ChildZygoteProcess extends ZygoteProcess { 32 /** 33 * The PID of the child zygote process. 34 */ 35 private final int mPid; 36 37 /** 38 * The UID of the child zygote process. 39 */ 40 private final int mUid; 41 42 43 /** 44 * If this zygote process was dead; 45 */ 46 private AtomicBoolean mDead; 47 48 ChildZygoteProcess(LocalSocketAddress socketAddress, int pid, int uid)49 ChildZygoteProcess(LocalSocketAddress socketAddress, int pid, int uid) { 50 super(socketAddress, null); 51 mPid = pid; 52 mUid = uid; 53 mDead = new AtomicBoolean(false); 54 } 55 56 /** 57 * Returns the PID of the child-zygote process. 58 */ getPid()59 public int getPid() { 60 return mPid; 61 } 62 63 /** 64 * Check if child-zygote process is dead 65 */ isDead()66 public boolean isDead() { 67 if (mDead.get()) { 68 return true; 69 } 70 StrictMode.ThreadPolicy oldStrictModeThreadPolicy = StrictMode.allowThreadDiskReads(); 71 try { 72 if (Os.stat("/proc/" + mPid).st_uid == mUid) { 73 return false; 74 } 75 } catch (ErrnoException e) { 76 // Do nothing, it's dead. 77 } finally { 78 StrictMode.setThreadPolicy(oldStrictModeThreadPolicy); 79 } 80 mDead.set(true); 81 return true; 82 } 83 } 84