Merge "Pinner service for pinning files into memory" into nyc-dev

    private static boolean startSystemServer(String abiList, String socketName)

            throws MethodAndArgsCaller, RuntimeException {

        long capabilities = posixCapabilitiesAsBits(

            OsConstants.CAP_IPC_LOCK,

            OsConstants.CAP_KILL,

            OsConstants.CAP_NET_ADMIN,

            OsConstants.CAP_NET_BIND_SERVICE,

    <!-- True if the device supports persisting security logs across reboots. -->

    <bool name="config_supportPreRebootSecurityLogs">false</bool>

    <!-- Default files to pin via Pinner Service -->

    <string-array translatable="false" name="config_defaultPinnerServiceFiles">

    </string-array>

</resources>

  <java-symbol type="string" name="config_tvRemoteServicePackage" />

  <java-symbol type="bool" name="config_supportPreRebootSecurityLogs" />

  <!-- Pinner Service -->

  <java-symbol type="array" name="config_defaultPinnerServiceFiles" />

</resources>

/*

 * 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 com.android.server;

import android.content.Context;

import android.content.pm.PackageManager;

import android.content.res.Resources;

import android.util.EventLog;

import android.util.Slog;

import android.os.Binder;

import android.os.Build;

import android.system.ErrnoException;

import android.system.Os;

import android.system.OsConstants;

import android.system.StructStat;

import java.util.ArrayList;

import java.io.FileDescriptor;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.PrintWriter;

/**

 * <p>PinnerService pins important files for key processes in memory.</p>

 * <p>Files to pin are specified in the config_defaultPinnerServiceFiles

 * overlay. </p>

 */

public final class PinnerService extends SystemService {

    private static final boolean DEBUG = false;

    private static final String TAG = "PinnerService";

    private final Context mContext;

    private final ArrayList<String> mPinnedFiles = new ArrayList<String>();

    private BinderService mBinderService;

    public PinnerService(Context context) {

        super(context);

        mContext = context;

    }

    @Override

    public void onStart() {

        Slog.e(TAG, "Starting PinnerService");

        mBinderService = new BinderService();

        publishBinderService("pinner", mBinderService);

        // Files to pin come from the overlay and can be specified per-device config

        // Continue trying to pin remaining files even if there is a failure

        String[] filesToPin = mContext.getResources().getStringArray(com.android.internal.R.array.config_defaultPinnerServiceFiles);

        for (int i = 0; i < filesToPin.length; i++){

            boolean success = pinFile(filesToPin[i], 0, 0);

            if (success == true) {

                mPinnedFiles.add(filesToPin[i]);

                Slog.i(TAG, "Pinned file = " + filesToPin[i]);

            } else {

                Slog.e(TAG, "Failed to pin file = " + filesToPin[i]);

            }

        }

    }

    // mlock length bytes of fileToPin in memory, starting at offset

    // length == 0 means pin from offset to end of file

    private boolean pinFile(String fileToPin, long offset, long length) {

        FileDescriptor fd = new FileDescriptor();

        try {

            fd = Os.open(fileToPin, OsConstants.O_RDONLY | OsConstants.O_CLOEXEC | OsConstants.O_NOFOLLOW, OsConstants.O_RDONLY);

            StructStat sb = Os.fstat(fd);

            if (offset + length > sb.st_size) {

                Os.close(fd);

                return false;

            }

            if (length == 0) {

                length = sb.st_size - offset;

            }

            long address = Os.mmap(0, length, OsConstants.PROT_READ, OsConstants.MAP_PRIVATE, fd, offset);

            Os.close(fd);

            Os.mlock(address, length);

            return true;

        } catch (ErrnoException e) {

            Slog.e(TAG, "Failed to pin file " + fileToPin + " with error " + e.getMessage());

            if(fd.valid()) {

                try { Os.close(fd); }

                catch (ErrnoException eClose) {Slog.e(TAG, "Failed to close fd, error = " + eClose.getMessage());}

            }

            return false;

        }

    }

    private final class BinderService extends Binder {

        @Override

        protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {

            mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG);

            pw.println("Pinned Files:");

            for (int i = 0; i < mPinnedFiles.size(); i++) {

                pw.println(mPinnedFiles.get(i));

            }

        }

    }

}

            traceBeginAndSlog("ConnectivityMetricsLoggerService");

            mSystemServiceManager.startService(MetricsLoggerService.class);

            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

            traceBeginAndSlog("PinnerService");

            mSystemServiceManager.startService(PinnerService.class);

            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

        } catch (RuntimeException e) {

            Slog.e("System", "******************************************");

            Slog.e("System", "************ Failure starting core service", e);