core/java/com/android/internal/net/NetworkStatsFactory.java - platform/frameworks/base - Git at Google

 /*
  * 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.net;

 import static android.net.NetworkStats.SET_ALL;
 import static android.net.NetworkStats.TAG_ALL;
 import static android.net.NetworkStats.TAG_NONE;
 import static android.net.NetworkStats.UID_ALL;
 import static com.android.server.NetworkManagementSocketTagger.kernelToTag;

 import android.net.NetworkStats;
 import android.os.StrictMode;
 import android.os.SystemClock;
 import android.util.ArrayMap;

 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.ArrayUtils;
 import com.android.internal.util.ProcFileReader;

 import libcore.io.IoUtils;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.net.ProtocolException;
 import java.util.Objects;

 /**
  * Creates {@link NetworkStats} instances by parsing various {@code /proc/}
  * files as needed.
  */
 public class NetworkStatsFactory {
     private static final String TAG = "NetworkStatsFactory";

     private static final boolean USE_NATIVE_PARSING = true;
     private static final boolean SANITY_CHECK_NATIVE = false;

     /** Path to {@code /proc/net/xt_qtaguid/iface_stat_all}. */
     private final File mStatsXtIfaceAll;
     /** Path to {@code /proc/net/xt_qtaguid/iface_stat_fmt}. */
     private final File mStatsXtIfaceFmt;
     /** Path to {@code /proc/net/xt_qtaguid/stats}. */
     private final File mStatsXtUid;

     @GuardedBy("sStackedIfaces")
     private static final ArrayMap<String, String> sStackedIfaces = new ArrayMap<>();

     public static void noteStackedIface(String stackedIface, String baseIface) {
         synchronized (sStackedIfaces) {
             if (baseIface != null) {
                 sStackedIfaces.put(stackedIface, baseIface);
             } else {
                 sStackedIfaces.remove(stackedIface);
             }
         }
     }

     public NetworkStatsFactory() {
         this(new File("/proc/"));
     }

     @VisibleForTesting
     public NetworkStatsFactory(File procRoot) {
         mStatsXtIfaceAll = new File(procRoot, "net/xt_qtaguid/iface_stat_all");
         mStatsXtIfaceFmt = new File(procRoot, "net/xt_qtaguid/iface_stat_fmt");
         mStatsXtUid = new File(procRoot, "net/xt_qtaguid/stats");
     }

     /**
      * Parse and return interface-level summary {@link NetworkStats} measured
      * using {@code /proc/net/dev} style hooks, which may include non IP layer
      * traffic. Values monotonically increase since device boot, and may include
      * details about inactive interfaces.
      *
      * @throws IllegalStateException when problem parsing stats.
      */
     public NetworkStats readNetworkStatsSummaryDev() throws IOException {
         final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();

         final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6);
         final NetworkStats.Entry entry = new NetworkStats.Entry();

         ProcFileReader reader = null;
         try {
             reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceAll));

             while (reader.hasMoreData()) {
                 entry.iface = reader.nextString();
                 entry.uid = UID_ALL;
                 entry.set = SET_ALL;
                 entry.tag = TAG_NONE;

                 final boolean active = reader.nextInt() != 0;

                 // always include snapshot values
                 entry.rxBytes = reader.nextLong();
                 entry.rxPackets = reader.nextLong();
                 entry.txBytes = reader.nextLong();
                 entry.txPackets = reader.nextLong();

                 // fold in active numbers, but only when active
                 if (active) {
                     entry.rxBytes += reader.nextLong();
                     entry.rxPackets += reader.nextLong();
                     entry.txBytes += reader.nextLong();
                     entry.txPackets += reader.nextLong();
                 }

                 stats.addValues(entry);
                 reader.finishLine();
             }
         } catch (NullPointerException e) {
             throw new ProtocolException("problem parsing stats", e);
         } catch (NumberFormatException e) {
             throw new ProtocolException("problem parsing stats", e);
         } finally {
             IoUtils.closeQuietly(reader);
             StrictMode.setThreadPolicy(savedPolicy);
         }
         return stats;
     }

     /**
      * Parse and return interface-level summary {@link NetworkStats}. Designed
      * to return only IP layer traffic. Values monotonically increase since
      * device boot, and may include details about inactive interfaces.
      *
      * @throws IllegalStateException when problem parsing stats.
      */
     public NetworkStats readNetworkStatsSummaryXt() throws IOException {
         final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();

         // return null when kernel doesn't support
         if (!mStatsXtIfaceFmt.exists()) return null;

         final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6);
         final NetworkStats.Entry entry = new NetworkStats.Entry();

         ProcFileReader reader = null;
         try {
             // open and consume header line
             reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceFmt));
             reader.finishLine();

             while (reader.hasMoreData()) {
                 entry.iface = reader.nextString();
                 entry.uid = UID_ALL;
                 entry.set = SET_ALL;
                 entry.tag = TAG_NONE;

                 entry.rxBytes = reader.nextLong();
                 entry.rxPackets = reader.nextLong();
                 entry.txBytes = reader.nextLong();
                 entry.txPackets = reader.nextLong();

                 stats.addValues(entry);
                 reader.finishLine();
             }
         } catch (NullPointerException e) {
             throw new ProtocolException("problem parsing stats", e);
         } catch (NumberFormatException e) {
             throw new ProtocolException("problem parsing stats", e);
         } finally {
             IoUtils.closeQuietly(reader);
             StrictMode.setThreadPolicy(savedPolicy);
         }
         return stats;
     }

     public NetworkStats readNetworkStatsDetail() throws IOException {
         return readNetworkStatsDetail(UID_ALL, null, TAG_ALL, null);
     }

     public NetworkStats readNetworkStatsDetail(int limitUid, String[] limitIfaces, int limitTag,
             NetworkStats lastStats) throws IOException {
         final NetworkStats stats = readNetworkStatsDetailInternal(limitUid, limitIfaces, limitTag,
                 lastStats);

         synchronized (sStackedIfaces) {
             // Sigh, xt_qtaguid ends up double-counting tx traffic going through
             // clatd interfaces, so we need to subtract it here.
             final int size = sStackedIfaces.size();
             for (int i = 0; i < size; i++) {
                 final String stackedIface = sStackedIfaces.keyAt(i);
                 final String baseIface = sStackedIfaces.valueAt(i);

                 // Count up the tx traffic and subtract from root UID on the
                 // base interface.
                 NetworkStats.Entry adjust = new NetworkStats.Entry(baseIface, 0, 0, 0, 0L, 0L, 0L,
                         0L, 0L);
                 NetworkStats.Entry entry = null;
                 for (int j = 0; j < stats.size(); j++) {
                     entry = stats.getValues(j, entry);
                     if (Objects.equals(entry.iface, stackedIface)) {
                         adjust.txBytes -= entry.txBytes;
                         adjust.txPackets -= entry.txPackets;
                     }
                 }
                 stats.combineValues(adjust);
             }
         }

         // Double sigh, all rx traffic on clat needs to be tweaked to
         // account for the dropped IPv6 header size post-unwrap.
         NetworkStats.Entry entry = null;
         for (int i = 0; i < stats.size(); i++) {
             entry = stats.getValues(i, entry);
             if (entry.iface != null && entry.iface.startsWith("clat")) {
                 // Delta between IPv4 header (20b) and IPv6 header (40b)
                 entry.rxBytes = entry.rxPackets * 20;
                 entry.rxPackets = 0;
                 entry.txBytes = 0;
                 entry.txPackets = 0;
                 stats.combineValues(entry);
             }
         }

         return stats;
     }

     private NetworkStats readNetworkStatsDetailInternal(int limitUid, String[] limitIfaces,
             int limitTag, NetworkStats lastStats) throws IOException {
         if (USE_NATIVE_PARSING) {
             final NetworkStats stats;
             if (lastStats != null) {
                 stats = lastStats;
                 stats.setElapsedRealtime(SystemClock.elapsedRealtime());
             } else {
                 stats = new NetworkStats(SystemClock.elapsedRealtime(), -1);
             }
             if (nativeReadNetworkStatsDetail(stats, mStatsXtUid.getAbsolutePath(), limitUid,
                     limitIfaces, limitTag) != 0) {
                 throw new IOException("Failed to parse network stats");
             }
             if (SANITY_CHECK_NATIVE) {
                 final NetworkStats javaStats = javaReadNetworkStatsDetail(mStatsXtUid, limitUid,
                         limitIfaces, limitTag);
                 assertEquals(javaStats, stats);
             }
             return stats;
         } else {
             return javaReadNetworkStatsDetail(mStatsXtUid, limitUid, limitIfaces, limitTag);
         }
     }

     /**
      * Parse and return {@link NetworkStats} with UID-level details. Values are
      * expected to monotonically increase since device boot.
      */
     @VisibleForTesting
     public static NetworkStats javaReadNetworkStatsDetail(File detailPath, int limitUid,
             String[] limitIfaces, int limitTag)
             throws IOException {
         final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();

         final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 24);
         final NetworkStats.Entry entry = new NetworkStats.Entry();

         int idx = 1;
         int lastIdx = 1;

         ProcFileReader reader = null;
         try {
             // open and consume header line
             reader = new ProcFileReader(new FileInputStream(detailPath));
             reader.finishLine();

             while (reader.hasMoreData()) {
                 idx = reader.nextInt();
                 if (idx != lastIdx + 1) {
                     throw new ProtocolException(
                             "inconsistent idx=" + idx + " after lastIdx=" + lastIdx);
                 }
                 lastIdx = idx;

                 entry.iface = reader.nextString();
                 entry.tag = kernelToTag(reader.nextString());
                 entry.uid = reader.nextInt();
                 entry.set = reader.nextInt();
                 entry.rxBytes = reader.nextLong();
                 entry.rxPackets = reader.nextLong();
                 entry.txBytes = reader.nextLong();
                 entry.txPackets = reader.nextLong();

                 if ((limitIfaces == null || ArrayUtils.contains(limitIfaces, entry.iface))
                         && (limitUid == UID_ALL || limitUid == entry.uid)
                         && (limitTag == TAG_ALL || limitTag == entry.tag)) {
                     stats.addValues(entry);
                 }

                 reader.finishLine();
             }
         } catch (NullPointerException e) {
             throw new ProtocolException("problem parsing idx " + idx, e);
         } catch (NumberFormatException e) {
             throw new ProtocolException("problem parsing idx " + idx, e);
         } finally {
             IoUtils.closeQuietly(reader);
             StrictMode.setThreadPolicy(savedPolicy);
         }

         return stats;
     }

     public void assertEquals(NetworkStats expected, NetworkStats actual) {
         if (expected.size() != actual.size()) {
             throw new AssertionError(
                     "Expected size " + expected.size() + ", actual size " + actual.size());
         }

         NetworkStats.Entry expectedRow = null;
         NetworkStats.Entry actualRow = null;
         for (int i = 0; i < expected.size(); i++) {
             expectedRow = expected.getValues(i, expectedRow);
             actualRow = actual.getValues(i, actualRow);
             if (!expectedRow.equals(actualRow)) {
                 throw new AssertionError(
                         "Expected row " + i + ": " + expectedRow + ", actual row " + actualRow);
             }
         }
     }

     /**
      * Parse statistics from file into given {@link NetworkStats} object. Values
      * are expected to monotonically increase since device boot.
      */
     @VisibleForTesting
     public static native int nativeReadNetworkStatsDetail(
             NetworkStats stats, String path, int limitUid, String[] limitIfaces, int limitTag);
 }
	/*
	* 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.net;

	import static android.net.NetworkStats.SET_ALL;
	import static android.net.NetworkStats.TAG_ALL;
	import static android.net.NetworkStats.TAG_NONE;
	import static android.net.NetworkStats.UID_ALL;
	import static com.android.server.NetworkManagementSocketTagger.kernelToTag;

	import android.net.NetworkStats;
	import android.os.StrictMode;
	import android.os.SystemClock;
	import android.util.ArrayMap;

	import com.android.internal.annotations.GuardedBy;
	import com.android.internal.annotations.VisibleForTesting;
	import com.android.internal.util.ArrayUtils;
	import com.android.internal.util.ProcFileReader;

	import libcore.io.IoUtils;

	import java.io.File;
	import java.io.FileInputStream;
	import java.io.IOException;
	import java.net.ProtocolException;
	import java.util.Objects;

	/**
	* Creates {@link NetworkStats} instances by parsing various {@code /proc/}
	* files as needed.
	*/
	public class NetworkStatsFactory {
	private static final String TAG = "NetworkStatsFactory";

	private static final boolean USE_NATIVE_PARSING = true;
	private static final boolean SANITY_CHECK_NATIVE = false;

	/** Path to {@code /proc/net/xt_qtaguid/iface_stat_all}. */
	private final File mStatsXtIfaceAll;
	/** Path to {@code /proc/net/xt_qtaguid/iface_stat_fmt}. */
	private final File mStatsXtIfaceFmt;
	/** Path to {@code /proc/net/xt_qtaguid/stats}. */
	private final File mStatsXtUid;

	@GuardedBy("sStackedIfaces")
	private static final ArrayMap<String, String> sStackedIfaces = new ArrayMap<>();

	public static void noteStackedIface(String stackedIface, String baseIface) {
	synchronized (sStackedIfaces) {
	if (baseIface != null) {
	sStackedIfaces.put(stackedIface, baseIface);
	} else {
	sStackedIfaces.remove(stackedIface);
	}
	}
	}

	public NetworkStatsFactory() {
	this(new File("/proc/"));
	}

	@VisibleForTesting
	public NetworkStatsFactory(File procRoot) {
	mStatsXtIfaceAll = new File(procRoot, "net/xt_qtaguid/iface_stat_all");
	mStatsXtIfaceFmt = new File(procRoot, "net/xt_qtaguid/iface_stat_fmt");
	mStatsXtUid = new File(procRoot, "net/xt_qtaguid/stats");
	}

	/**
	* Parse and return interface-level summary {@link NetworkStats} measured
	* using {@code /proc/net/dev} style hooks, which may include non IP layer
	* traffic. Values monotonically increase since device boot, and may include
	* details about inactive interfaces.
	*
	* @throws IllegalStateException when problem parsing stats.
	*/
	public NetworkStats readNetworkStatsSummaryDev() throws IOException {
	final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();

	final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6);
	final NetworkStats.Entry entry = new NetworkStats.Entry();

	ProcFileReader reader = null;
	try {
	reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceAll));

	while (reader.hasMoreData()) {
	entry.iface = reader.nextString();
	entry.uid = UID_ALL;
	entry.set = SET_ALL;
	entry.tag = TAG_NONE;

	final boolean active = reader.nextInt() != 0;

	// always include snapshot values
	entry.rxBytes = reader.nextLong();
	entry.rxPackets = reader.nextLong();
	entry.txBytes = reader.nextLong();
	entry.txPackets = reader.nextLong();

	// fold in active numbers, but only when active
	if (active) {
	entry.rxBytes += reader.nextLong();
	entry.rxPackets += reader.nextLong();
	entry.txBytes += reader.nextLong();
	entry.txPackets += reader.nextLong();
	}

	stats.addValues(entry);
	reader.finishLine();
	}
	} catch (NullPointerException e) {
	throw new ProtocolException("problem parsing stats", e);
	} catch (NumberFormatException e) {
	throw new ProtocolException("problem parsing stats", e);
	} finally {
	IoUtils.closeQuietly(reader);
	StrictMode.setThreadPolicy(savedPolicy);
	}
	return stats;
	}

	/**
	* Parse and return interface-level summary {@link NetworkStats}. Designed
	* to return only IP layer traffic. Values monotonically increase since
	* device boot, and may include details about inactive interfaces.
	*
	* @throws IllegalStateException when problem parsing stats.
	*/
	public NetworkStats readNetworkStatsSummaryXt() throws IOException {
	final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();

	// return null when kernel doesn't support
	if (!mStatsXtIfaceFmt.exists()) return null;

	final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6);
	final NetworkStats.Entry entry = new NetworkStats.Entry();

	ProcFileReader reader = null;
	try {
	// open and consume header line
	reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceFmt));
	reader.finishLine();

	while (reader.hasMoreData()) {
	entry.iface = reader.nextString();
	entry.uid = UID_ALL;
	entry.set = SET_ALL;
	entry.tag = TAG_NONE;

	entry.rxBytes = reader.nextLong();
	entry.rxPackets = reader.nextLong();
	entry.txBytes = reader.nextLong();
	entry.txPackets = reader.nextLong();

	stats.addValues(entry);
	reader.finishLine();
	}
	} catch (NullPointerException e) {
	throw new ProtocolException("problem parsing stats", e);
	} catch (NumberFormatException e) {
	throw new ProtocolException("problem parsing stats", e);
	} finally {
	IoUtils.closeQuietly(reader);
	StrictMode.setThreadPolicy(savedPolicy);
	}
	return stats;
	}

	public NetworkStats readNetworkStatsDetail() throws IOException {
	return readNetworkStatsDetail(UID_ALL, null, TAG_ALL, null);
	}

	public NetworkStats readNetworkStatsDetail(int limitUid, String[] limitIfaces, int limitTag,
	NetworkStats lastStats) throws IOException {
	final NetworkStats stats = readNetworkStatsDetailInternal(limitUid, limitIfaces, limitTag,
	lastStats);

	synchronized (sStackedIfaces) {
	// Sigh, xt_qtaguid ends up double-counting tx traffic going through
	// clatd interfaces, so we need to subtract it here.
	final int size = sStackedIfaces.size();
	for (int i = 0; i < size; i++) {
	final String stackedIface = sStackedIfaces.keyAt(i);
	final String baseIface = sStackedIfaces.valueAt(i);

	// Count up the tx traffic and subtract from root UID on the
	// base interface.
	NetworkStats.Entry adjust = new NetworkStats.Entry(baseIface, 0, 0, 0, 0L, 0L, 0L,
	0L, 0L);
	NetworkStats.Entry entry = null;
	for (int j = 0; j < stats.size(); j++) {
	entry = stats.getValues(j, entry);
	if (Objects.equals(entry.iface, stackedIface)) {
	adjust.txBytes -= entry.txBytes;
	adjust.txPackets -= entry.txPackets;
	}
	}
	stats.combineValues(adjust);
	}
	}

	// Double sigh, all rx traffic on clat needs to be tweaked to
	// account for the dropped IPv6 header size post-unwrap.
	NetworkStats.Entry entry = null;
	for (int i = 0; i < stats.size(); i++) {
	entry = stats.getValues(i, entry);
	if (entry.iface != null && entry.iface.startsWith("clat")) {
	// Delta between IPv4 header (20b) and IPv6 header (40b)
	entry.rxBytes = entry.rxPackets * 20;
	entry.rxPackets = 0;
	entry.txBytes = 0;
	entry.txPackets = 0;
	stats.combineValues(entry);
	}
	}

	return stats;
	}

	private NetworkStats readNetworkStatsDetailInternal(int limitUid, String[] limitIfaces,
	int limitTag, NetworkStats lastStats) throws IOException {
	if (USE_NATIVE_PARSING) {
	final NetworkStats stats;
	if (lastStats != null) {
	stats = lastStats;
	stats.setElapsedRealtime(SystemClock.elapsedRealtime());
	} else {
	stats = new NetworkStats(SystemClock.elapsedRealtime(), -1);
	}
	if (nativeReadNetworkStatsDetail(stats, mStatsXtUid.getAbsolutePath(), limitUid,
	limitIfaces, limitTag) != 0) {
	throw new IOException("Failed to parse network stats");
	}
	if (SANITY_CHECK_NATIVE) {
	final NetworkStats javaStats = javaReadNetworkStatsDetail(mStatsXtUid, limitUid,
	limitIfaces, limitTag);
	assertEquals(javaStats, stats);
	}
	return stats;
	} else {
	return javaReadNetworkStatsDetail(mStatsXtUid, limitUid, limitIfaces, limitTag);
	}
	}

	/**
	* Parse and return {@link NetworkStats} with UID-level details. Values are
	* expected to monotonically increase since device boot.
	*/
	@VisibleForTesting
	public static NetworkStats javaReadNetworkStatsDetail(File detailPath, int limitUid,
	String[] limitIfaces, int limitTag)
	throws IOException {
	final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();

	final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 24);
	final NetworkStats.Entry entry = new NetworkStats.Entry();

	int idx = 1;
	int lastIdx = 1;

	ProcFileReader reader = null;
	try {
	// open and consume header line
	reader = new ProcFileReader(new FileInputStream(detailPath));
	reader.finishLine();

	while (reader.hasMoreData()) {
	idx = reader.nextInt();
	if (idx != lastIdx + 1) {
	throw new ProtocolException(
	"inconsistent idx=" + idx + " after lastIdx=" + lastIdx);
	}
	lastIdx = idx;

	entry.iface = reader.nextString();
	entry.tag = kernelToTag(reader.nextString());
	entry.uid = reader.nextInt();
	entry.set = reader.nextInt();
	entry.rxBytes = reader.nextLong();
	entry.rxPackets = reader.nextLong();
	entry.txBytes = reader.nextLong();
	entry.txPackets = reader.nextLong();

	if ((limitIfaces == null \|\| ArrayUtils.contains(limitIfaces, entry.iface))
	&& (limitUid == UID_ALL \|\| limitUid == entry.uid)
	&& (limitTag == TAG_ALL \|\| limitTag == entry.tag)) {
	stats.addValues(entry);
	}

	reader.finishLine();
	}
	} catch (NullPointerException e) {
	throw new ProtocolException("problem parsing idx " + idx, e);
	} catch (NumberFormatException e) {
	throw new ProtocolException("problem parsing idx " + idx, e);
	} finally {
	IoUtils.closeQuietly(reader);
	StrictMode.setThreadPolicy(savedPolicy);
	}

	return stats;
	}

	public void assertEquals(NetworkStats expected, NetworkStats actual) {
	if (expected.size() != actual.size()) {
	throw new AssertionError(
	"Expected size " + expected.size() + ", actual size " + actual.size());
	}

	NetworkStats.Entry expectedRow = null;
	NetworkStats.Entry actualRow = null;
	for (int i = 0; i < expected.size(); i++) {
	expectedRow = expected.getValues(i, expectedRow);
	actualRow = actual.getValues(i, actualRow);
	if (!expectedRow.equals(actualRow)) {
	throw new AssertionError(
	"Expected row " + i + ": " + expectedRow + ", actual row " + actualRow);
	}
	}
	}

	/**
	* Parse statistics from file into given {@link NetworkStats} object. Values
	* are expected to monotonically increase since device boot.
	*/
	@VisibleForTesting
	public static native int nativeReadNetworkStatsDetail(
	NetworkStats stats, String path, int limitUid, String[] limitIfaces, int limitTag);
	}