1 /* 2 * Copyright (C) 2016 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 18 #define LOG_TAG "WebViewZygote" 19 20 #include <sys/prctl.h> 21 22 #include <android_runtime/AndroidRuntime.h> 23 #include <binder/IPCThreadState.h> 24 #include <binder/ProcessState.h> 25 #include <utils/Log.h> 26 #include <utils/String8.h> 27 #include <utils/Vector.h> 28 29 namespace android { 30 31 class WebViewRuntime : public AndroidRuntime { 32 public: 33 WebViewRuntime(char* argBlockStart, size_t argBlockSize) 34 : AndroidRuntime(argBlockStart, argBlockSize) {} 35 36 ~WebViewRuntime() override {} 37 38 void onStarted() override { 39 // Nothing to do since this is a zygote server. 40 } 41 42 void onVmCreated(JNIEnv*) override { 43 // Nothing to do when the VM is created in the zygote. 44 } 45 46 void onZygoteInit() override { 47 // Called after a new process is forked. 48 sp<ProcessState> proc = ProcessState::self(); 49 proc->startThreadPool(); 50 } 51 52 void onExit(int code) override { 53 IPCThreadState::self()->stopProcess(); 54 AndroidRuntime::onExit(code); 55 } 56 }; 57 58 } // namespace android 59 60 int main(int argc, char* const argv[]) { 61 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { 62 LOG_ALWAYS_FATAL("PR_SET_NO_NEW_PRIVS failed: %s", strerror(errno)); 63 return 12; 64 } 65 66 size_t argBlockSize = 0; 67 for (int i = 0; i < argc; ++i) { 68 argBlockSize += strlen(argv[i]) + 1; 69 } 70 71 android::WebViewRuntime runtime(argv[0], argBlockSize); 72 runtime.addOption("-Xzygote"); 73 74 android::Vector<android::String8> args; 75 runtime.start("com.android.internal.os.WebViewZygoteInit", args, /*zygote=*/ true); 76 } 77