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Change TrafficStats to a new JNI implementation.

Browse Source 
Also change phone's ConnectionStateTrackers to use it directly,
rather than through the INetStat binder interface.

Bug: 2578938
Change-Id: I8858e2609cbec3be845a0ce5178cb03f67e01b41
This commit is contained in:
Dan Egnor
2010-04-07 17:30:50 -07:00
parent 07726310ae
commit eaeb70241c
2 changed files with 180 additions and 155 deletions
Download Patch File Download Diff File Expand all files Collapse all files

170
core/java/android/net/TrafficStats.java
View File

@@ -23,12 +23,12 @@ 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.
* 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.
* 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 {
/**
@@ -36,27 +36,13 @@ public class TrafficStats {
*/
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 getMobileTxPackets() {
return getMobileStat(MOBILE_TX_PACKETS);
}
public static native long getMobileTxPackets();
/**
* Get the total number of packets received through the mobile interface.
@@ -64,9 +50,7 @@ public class TrafficStats {
* @return number of packets. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getMobileRxPackets() {
return getMobileStat(MOBILE_RX_PACKETS);
}
public static native long getMobileRxPackets();
/**
* Get the total number of bytes transmitted through the mobile interface.
@@ -74,9 +58,7 @@ public class TrafficStats {
* @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);
}
public static native long getMobileTxBytes();
/**
* Get the total number of bytes received through the mobile interface.
@@ -84,9 +66,7 @@ public class TrafficStats {
* @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);
}
public static native long getMobileRxBytes();
/**
* Get the total number of packets sent through all network interfaces.
@@ -94,9 +74,7 @@ public class TrafficStats {
* @return the number of packets. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getTotalTxPackets() {
return getTotalStat("tx_packets");
}
public static native long getTotalTxPackets();
/**
* Get the total number of packets received through all network interfaces.
@@ -104,9 +82,7 @@ public class TrafficStats {
* @return number of packets. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getTotalRxPackets() {
return getTotalStat("rx_packets");
}
public static native long getTotalRxPackets();
/**
* Get the total number of bytes sent through all network interfaces.
@@ -114,9 +90,7 @@ public class TrafficStats {
* @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");
}
public static native long getTotalTxBytes();
/**
* Get the total number of bytes received through all network interfaces.
@@ -124,9 +98,7 @@ public class TrafficStats {
* @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");
}
public static native long getTotalRxBytes();
/**
* Get the number of bytes sent through the network for this UID.
@@ -138,9 +110,7 @@ public class TrafficStats {
* @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");
}
public static native long getUidTxBytes(int uid);
/**
* Get the number of bytes received through the network for this UID.
@@ -151,115 +121,5 @@ public class TrafficStats {
* @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;
}
}
public static native long getUidRxBytes(int uid);
}

165
core/jni/android_net_TrafficStats.cpp Normal file
View File

@@ -0,0 +1,165 @@
/*
* Copyright (C) 2010 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.
*/
#define LOG_TAG "TrafficStats"
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <android_runtime/AndroidRuntime.h>
#include <cutils/logger.h>
#include <jni.h>
#include <utils/misc.h>
#include <utils/Log.h>
namespace android {
// Returns an ASCII decimal number read from the specified file, -1 on error.
static jlong readNumber(char const* filename) {
char buf[80];
int fd = open(filename, O_RDONLY);
if (fd < 0) {
if (errno != ENOENT) LOGE("Can't open %s: %s", filename, strerror(errno));
return -1;
}
int len = read(fd, buf, sizeof(buf) - 1);
if (len < 0) {
LOGE("Can't read %s: %s", filename, strerror(errno));
close(fd);
return -1;
}
close(fd);
buf[len] = '\0';
return atoll(buf);
}
// Return the number from the first file which exists and contains data
static jlong tryBoth(char const* a, char const* b) {
jlong num = readNumber(a);
return num >= 0 ? num : readNumber(b);
}
// Returns the sum of numbers from the specified path under /sys/class/net/*,
// -1 if no such file exists.
static jlong readTotal(char const* suffix) {
char filename[PATH_MAX] = "/sys/class/net/";
DIR *dir = opendir(filename);
if (dir == NULL) {
LOGE("Can't list %s: %s", filename, strerror(errno));
return -1;
}
int len = strlen(filename);
jlong total = -1;
while (struct dirent *entry = readdir(dir)) {
// Skip ., .., and localhost interfaces.
if (entry->d_name[0] != '.' && strncmp(entry->d_name, "lo", 2) != 0) {
strlcpy(filename + len, entry->d_name, sizeof(filename) - len);
strlcat(filename, suffix, sizeof(filename));
jlong num = readNumber(filename);
if (num >= 0) total = total < 0 ? num : total + num;
}
}
closedir(dir);
return total;
}
// Mobile stats get accessed a lot more often than total stats.
// Note the individual files can come and go at runtime, so we check
// each file every time (rather than caching which ones exist).
static jlong getMobileTxPackets(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/tx_packets",
"/sys/class/net/ppp0/statistics/tx_packets");
}
static jlong getMobileRxPackets(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/rx_packets",
"/sys/class/net/ppp0/statistics/rx_packets");
}
static jlong getMobileTxBytes(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/tx_bytes",
"/sys/class/net/ppp0/statistics/tx_bytes");
}
static jlong getMobileRxBytes(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/rx_bytes",
"/sys/class/net/ppp0/statistics/rx_bytes");
}
// Total stats are read less often, so we're willing to put up
// with listing the directory and concatenating filenames.
static jlong getTotalTxPackets(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/tx_packets");
}
static jlong getTotalRxPackets(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/rx_packets");
}
static jlong getTotalTxBytes(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/tx_bytes");
}
static jlong getTotalRxBytes(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/rx_bytes");
}
// Per-UID stats require reading from a constructed filename.
static jlong getUidRxBytes(JNIEnv* env, jobject clazz, jint uid) {
char filename[80];
sprintf(filename, "/proc/uid_stat/%d/tcp_rcv", uid);
return readNumber(filename);
}
static jlong getUidTxBytes(JNIEnv* env, jobject clazz, jint uid) {
char filename[80];
sprintf(filename, "/proc/uid_stat/%d/tcp_snd", uid);
return readNumber(filename);
}
static JNINativeMethod gMethods[] = {
{"getMobileTxPackets", "()J", (void*) getMobileTxPackets},
{"getMobileRxPackets", "()J", (void*) getMobileRxPackets},
{"getMobileTxBytes", "()J", (void*) getMobileTxBytes},
{"getMobileRxBytes", "()J", (void*) getMobileRxBytes},
{"getTotalTxPackets", "()J", (void*) getTotalTxPackets},
{"getTotalRxPackets", "()J", (void*) getTotalRxPackets},
{"getTotalTxBytes", "()J", (void*) getTotalTxBytes},
{"getTotalRxBytes", "()J", (void*) getTotalRxBytes},
{"getUidTxBytes", "(I)J", (void*) getUidTxBytes},
{"getUidRxBytes", "(I)J", (void*) getUidRxBytes},
};
int register_android_net_TrafficStats(JNIEnv* env) {
return AndroidRuntime::registerNativeMethods(env, "android/net/TrafficStats",
gMethods, NELEM(gMethods));
}
}