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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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.
*/
package android.webkit;
import android.content.pm.PackageInfo;
import android.os.Build;
import android.os.ChildZygoteProcess;
import android.os.Process;
import android.os.ZygoteProcess;
import android.text.TextUtils;
import android.util.Log;
import com.android.internal.annotations.GuardedBy;
/** @hide */
public class WebViewZygote {
private static final String LOGTAG = "WebViewZygote";
/**
* Lock object that protects all other static members.
*/
private static final Object sLock = new Object();
/**
* Instance that maintains the socket connection to the zygote. This is {@code null} if the
* zygote is not running or is not connected.
*/
@GuardedBy("sLock")
private static ChildZygoteProcess sZygote;
/**
* Information about the selected WebView package. This is set from #onWebViewProviderChanged().
*/
@GuardedBy("sLock")
private static PackageInfo sPackage;
/**
* Flag for whether multi-process WebView is enabled. If this is {@code false}, the zygote
* will not be started.
*/
@GuardedBy("sLock")
private static boolean sMultiprocessEnabled = false;
public static ZygoteProcess getProcess() {
synchronized (sLock) {
if (sZygote != null) return sZygote;
connectToZygoteIfNeededLocked();
return sZygote;
}
}
public static String getPackageName() {
synchronized (sLock) {
return sPackage.packageName;
}
}
public static boolean isMultiprocessEnabled() {
synchronized (sLock) {
return sMultiprocessEnabled && sPackage != null;
}
}
public static void setMultiprocessEnabled(boolean enabled) {
synchronized (sLock) {
sMultiprocessEnabled = enabled;
// When multi-process is disabled, kill the zygote. When it is enabled,
// the zygote will be started when it is first needed in getProcess().
if (!enabled) {
stopZygoteLocked();
}
}
}
static void onWebViewProviderChanged(PackageInfo packageInfo) {
synchronized (sLock) {
sPackage = packageInfo;
// If multi-process is not enabled, then do not start the zygote service.
if (!sMultiprocessEnabled) {
return;
}
stopZygoteLocked();
}
}
@GuardedBy("sLock")
private static void stopZygoteLocked() {
if (sZygote != null) {
// Close the connection and kill the zygote process. This will not cause
// child processes to be killed by itself. But if this is called in response to
// setMultiprocessEnabled() or onWebViewProviderChanged(), the WebViewUpdater
// will kill all processes that depend on the WebView package.
sZygote.close();
Process.killProcess(sZygote.getPid());
sZygote = null;
}
}
@GuardedBy("sLock")
private static void connectToZygoteIfNeededLocked() {
if (sZygote != null) {
return;
}
if (sPackage == null) {
Log.e(LOGTAG, "Cannot connect to zygote, no package specified");
return;
}
try {
String abi = sPackage.applicationInfo.primaryCpuAbi;
sZygote = Process.ZYGOTE_PROCESS.startChildZygote(
"com.android.internal.os.WebViewZygoteInit",
"webview_zygote",
Process.WEBVIEW_ZYGOTE_UID,
Process.WEBVIEW_ZYGOTE_UID,
null, // gids
0, // runtimeFlags
"webview_zygote", // seInfo
abi, // abi
TextUtils.join(",", Build.SUPPORTED_ABIS),
null, // instructionSet
Process.FIRST_ISOLATED_UID,
Integer.MAX_VALUE); // TODO(b/123615476) deal with user-id ranges properly
ZygoteProcess.waitForConnectionToZygote(sZygote.getPrimarySocketAddress());
sZygote.preloadApp(sPackage.applicationInfo, abi);
} catch (Exception e) {
Log.e(LOGTAG, "Error connecting to webview zygote", e);
stopZygoteLocked();
}
}
}
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