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Diffstat (limited to 'core/java/android/net/TrafficStats.java')
-rw-r--r-- | core/java/android/net/TrafficStats.java | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/core/java/android/net/TrafficStats.java b/core/java/android/net/TrafficStats.java new file mode 100644 index 0000000..62e9f1f --- /dev/null +++ b/core/java/android/net/TrafficStats.java @@ -0,0 +1,265 @@ +/* + * Copyright (C) 2007 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.net; + +import android.util.Log; + +import java.io.File; +import java.io.RandomAccessFile; +import java.io.IOException; + +/** + * Class that provides network traffic statistics. These statistics include bytes transmitted and + * received and network packets transmitted and received, over all interfaces, over the mobile + * interface, and on a per-UID basis. + * <p> + * These statistics may not be available on all platforms. If the statistics are not supported + * by this device, {@link #UNSUPPORTED} will be returned. + */ +public class TrafficStats { + /** + * The return value to indicate that the device does not support the statistic. + */ + public final static int UNSUPPORTED = -1; + + // Logging tag. + private final static String TAG = "trafficstats"; + + // We pre-create all the File objects so we don't spend a lot of + // CPU at runtime converting from Java Strings to byte[] for the + // kernel calls. + private final static File[] MOBILE_TX_PACKETS = mobileFiles("tx_packets"); + private final static File[] MOBILE_RX_PACKETS = mobileFiles("rx_packets"); + private final static File[] MOBILE_TX_BYTES = mobileFiles("tx_bytes"); + private final static File[] MOBILE_RX_BYTES = mobileFiles("rx_bytes"); + private final static File SYS_CLASS_NET_DIR = new File("/sys/class/net"); + + /** + * Get the total number of packets transmitted through the mobile interface. + * + * @return number of packets. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getMobileTxPkts() { + return getMobileStat(MOBILE_TX_PACKETS); + } + + /** + * Get the total number of packets received through the mobile interface. + * + * @return number of packets. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getMobileRxPkts() { + return getMobileStat(MOBILE_RX_PACKETS); + } + + /** + * Get the total number of bytes transmitted through the mobile interface. + * + * @return number of bytes. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getMobileTxBytes() { + return getMobileStat(MOBILE_TX_BYTES); + } + + /** + * Get the total number of bytes received through the mobile interface. + * + * @return number of bytes. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getMobileRxBytes() { + return getMobileStat(MOBILE_RX_BYTES); + } + + /** + * Get the total number of packets sent through all network interfaces. + * + * @return the number of packets. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getTotalTxPkts() { + return getTotalStat("tx_packets"); + } + + /** + * Get the total number of packets received through all network interfaces. + * + * @return number of packets. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getTotalRxPkts() { + return getTotalStat("rx_packets"); + } + + /** + * Get the total number of bytes sent through all network interfaces. + * + * @return number of bytes. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getTotalTxBytes() { + return getTotalStat("tx_bytes"); + } + + /** + * Get the total number of bytes received through all network interfaces. + * + * @return number of bytes. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getTotalRxBytes() { + return getTotalStat("rx_bytes"); + } + + /** + * Get the number of bytes sent through the network for this UID. + * The statistics are across all interfaces. + * + * {@see android.os.Process#myUid()}. + * + * @param uid The UID of the process to examine. + * @return number of bytes. If the statistics are not supported by this device, + * {@link #UNSUPPORTED} will be returned. + */ + public static long getUidTxBytes(int uid) { + return getNumberFromFilePath("/proc/uid_stat/" + uid + "/tcp_snd"); + } + + /** + * Get the number of bytes received through the network for this UID. + * The statistics are across all interfaces. + * + * {@see android.os.Process#myUid()}. + * + * @param uid The UID of the process to examine. + * @return number of bytes + */ + public static long getUidRxBytes(int uid) { + return getNumberFromFilePath("/proc/uid_stat/" + uid + "/tcp_rcv"); + } + + /** + * Returns the array of two possible File locations for a given + * statistic. + */ + private static File[] mobileFiles(String whatStat) { + // Note that we stat them at runtime to see which is + // available, rather than here, to guard against the files + // coming & going later as modules shut down (e.g. airplane + // mode) and whatnot. The runtime stat() isn't expensive compared + // to the previous charset conversion that happened before we + // were reusing File instances. + File[] files = new File[2]; + files[0] = new File("/sys/class/net/rmnet0/statistics/" + whatStat); + files[1] = new File("/sys/class/net/ppp0/statistics/" + whatStat); + return files; + } + + private static long getTotalStat(String whatStat) { + File netdir = new File("/sys/class/net"); + + File[] nets = SYS_CLASS_NET_DIR.listFiles(); + if (nets == null) { + return UNSUPPORTED; + } + long total = 0; + StringBuffer strbuf = new StringBuffer(); + for (File net : nets) { + strbuf.append(net.getPath()).append(File.separator).append("statistics") + .append(File.separator).append(whatStat); + total += getNumberFromFilePath(strbuf.toString()); + strbuf.setLength(0); + } + return total; + } + + private static long getMobileStat(File[] files) { + for (int i = 0; i < files.length; i++) { + File file = files[i]; + if (!file.exists()) { + continue; + } + try { + RandomAccessFile raf = new RandomAccessFile(file, "r"); + return getNumberFromFile(raf, file.getAbsolutePath()); + } catch (IOException e) { + Log.w(TAG, + "Exception opening TCP statistics file " + file.getAbsolutePath(), + e); + } + } + return UNSUPPORTED; + } + + // File will have format <number><newline> + private static long getNumberFromFilePath(String filename) { + RandomAccessFile raf = getFile(filename); + if (raf == null) { + return UNSUPPORTED; + } + return getNumberFromFile(raf, filename); + } + + // Private buffer for getNumberFromFile. Safe for re-use because + // getNumberFromFile is synchronized. + private final static byte[] buf = new byte[16]; + + private static synchronized long getNumberFromFile(RandomAccessFile raf, String filename) { + try { + raf.read(buf); + raf.close(); + } catch (IOException e) { + Log.w(TAG, "Exception getting TCP bytes from " + filename, e); + return UNSUPPORTED; + } finally { + if (raf != null) { + try { + raf.close(); + } catch (IOException e) { + Log.w(TAG, "Exception closing " + filename, e); + } + } + } + + long num = 0L; + for (int i = 0; i < buf.length; i++) { + if (buf[i] < '0' || buf[i] > '9') { + break; + } + num *= 10; + num += buf[i] - '0'; + } + return num; + } + + private static RandomAccessFile getFile(String filename) { + File f = new File(filename); + if (!f.canRead()) { + return null; + } + + try { + return new RandomAccessFile(f, "r"); + } catch (IOException e) { + Log.w(TAG, "Exception opening TCP statistics file " + filename, e); + return null; + } + } +} |