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/*
* Copyright (C) 2011 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 com.android.internal.os;
import android.os.Process;
import android.util.Slog;
import java.io.DataOutputStream;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import libcore.io.IoUtils;
import libcore.io.Libcore;
import dalvik.system.Zygote;
/**
* Startup class for the wrapper process.
* @hide
*/
public class WrapperInit {
private final static String TAG = "AndroidRuntime";
/**
* Class not instantiable.
*/
private WrapperInit() {
}
/**
* The main function called when starting a runtime application through a
* wrapper process instead of by forking Zygote.
*
* The first argument specifies the file descriptor for a pipe that should receive
* the pid of this process, or 0 if none.
*
* The second argument is the target SDK version for the app.
*
* The remaining arguments are passed to the runtime.
*
* @param args The command-line arguments.
*/
public static void main(String[] args) {
try {
// Parse our mandatory arguments.
int fdNum = Integer.parseInt(args[0], 10);
int targetSdkVersion = Integer.parseInt(args[1], 10);
// Tell the Zygote what our actual PID is (since it only knows about the
// wrapper that it directly forked).
if (fdNum != 0) {
try {
FileDescriptor fd = ZygoteInit.createFileDescriptor(fdNum);
DataOutputStream os = new DataOutputStream(new FileOutputStream(fd));
os.writeInt(Process.myPid());
os.close();
IoUtils.closeQuietly(fd);
} catch (IOException ex) {
Slog.d(TAG, "Could not write pid of wrapped process to Zygote pipe.", ex);
}
}
// Mimic Zygote preloading.
ZygoteInit.preload();
// Launch the application.
String[] runtimeArgs = new String[args.length - 2];
System.arraycopy(args, 2, runtimeArgs, 0, runtimeArgs.length);
RuntimeInit.wrapperInit(targetSdkVersion, runtimeArgs);
} catch (ZygoteInit.MethodAndArgsCaller caller) {
caller.run();
}
}
/**
* Executes a runtime application with a wrapper command.
* This method never returns.
*
* @param invokeWith The wrapper command.
* @param niceName The nice name for the application, or null if none.
* @param targetSdkVersion The target SDK version for the app.
* @param pipeFd The pipe to which the application's pid should be written, or null if none.
* @param args Arguments for {@link RuntimeInit.main}.
*/
public static void execApplication(String invokeWith, String niceName,
int targetSdkVersion, FileDescriptor pipeFd, String[] args) {
StringBuilder command = new StringBuilder(invokeWith);
command.append(" /system/bin/app_process /system/bin --application");
if (niceName != null) {
command.append(" '--nice-name=").append(niceName).append("'");
}
command.append(" com.android.internal.os.WrapperInit ");
command.append(pipeFd != null ? pipeFd.getInt$() : 0);
command.append(' ');
command.append(targetSdkVersion);
Zygote.appendQuotedShellArgs(command, args);
Zygote.execShell(command.toString());
}
/**
* Executes a standalone application with a wrapper command.
* This method never returns.
*
* @param invokeWith The wrapper command.
* @param classPath The class path.
* @param className The class name to invoke.
* @param args Arguments for the main() method of the specified class.
*/
public static void execStandalone(String invokeWith, String classPath, String className,
String[] args) {
StringBuilder command = new StringBuilder(invokeWith);
command.append(" /system/bin/dalvikvm -classpath '").append(classPath);
command.append("' ").append(className);
Zygote.appendQuotedShellArgs(command, args);
Zygote.execShell(command.toString());
}
}
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