Log Android7.1 logd 日志记录缓冲区大小 Android5.1 抓取系统日志脚本

Android logd日志原理   http://gityuan.com/2018/01/27/android-log/ 

一.Android7.1  logd 日志记录缓冲区大小先看上层

1.1.  布局 KEY

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private static final String SELECT_LOGD_SIZE_KEY = "select_logd_size";
private static final String SELECT_LOGD_SIZE_PROPERTY = "persist.logd.size";

1.2. writeLogdSizeOption()

           updateLogpersistValues()

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private void writeLogdSizeOption(Object newValue) {
    boolean disable = (newValue != null) &&
        (newValue.toString().equals(SELECT_LOGD_OFF_SIZE_MARKER_VALUE));
    String currentTag = SystemProperties.get(SELECT_LOGD_TAG_PROPERTY);
    if (currentTag == null) {
        currentTag = "";
    }
    // filter clean and unstack all references to our setting
    String newTag = currentTag.replaceAll(
            ",+" + SELECT_LOGD_TAG_SILENCE, "").replaceFirst(
            "^" + SELECT_LOGD_TAG_SILENCE + ",*", "").replaceAll(
            ",+", ",").replaceFirst(
            ",+$", "");
    if (disable) {
        newValue = SELECT_LOGD_MINIMUM_SIZE_VALUE;
        // Make sure snet_event_log get through first, but do not override
        String snetValue = SystemProperties.get(SELECT_LOGD_SNET_TAG_PROPERTY);
        if ((snetValue == null) || (snetValue.length() == 0)) {
            snetValue = SystemProperties.get(SELECT_LOGD_RUNTIME_SNET_TAG_PROPERTY);
            if ((snetValue == null) || (snetValue.length() == 0)) {
                SystemProperties.set(SELECT_LOGD_SNET_TAG_PROPERTY, "I");
            }
        }
        // Silence all log sources, security logs notwithstanding
        if (newTag.length() != 0) {
            newTag = "," + newTag;
        }
        // Stack settings, stack to help preserve original value
        newTag = SELECT_LOGD_TAG_SILENCE + newTag;
    }
    if (!newTag.equals(currentTag)) {
        SystemProperties.set(SELECT_LOGD_TAG_PROPERTY, newTag);
    }
    String defaultValue = defaultLogdSizeValue();
    final String size = ((newValue != null) && (newValue.toString().length() != 0)) ?
        newValue.toString() : defaultValue;
    SystemProperties.set(SELECT_LOGD_SIZE_PROPERTY, defaultValue.equals(size) ? "" : size);
    SystemProperties.set("ctl.start", "logd-reinit");
    pokeSystemProperties();
    updateLogdSizeValues();
}
 
 
private void updateLogdSizeValues() {
    if (mLogdSize != null) {
        String currentTag = SystemProperties.get(SELECT_LOGD_TAG_PROPERTY);
        String currentValue = SystemProperties.get(SELECT_LOGD_SIZE_PROPERTY);
        if ((currentTag != null) && currentTag.startsWith(SELECT_LOGD_TAG_SILENCE)) {
            currentValue = SELECT_LOGD_OFF_SIZE_MARKER_VALUE;
        }
        if (mLogpersist != null) {
            String currentLogpersistEnable
                = SystemProperties.get(ACTUAL_LOGPERSIST_PROPERTY_ENABLE);
            if ((currentLogpersistEnable == null)
                    || !currentLogpersistEnable.equals("true")
                    || currentValue.equals(SELECT_LOGD_OFF_SIZE_MARKER_VALUE)) {
                writeLogpersistOption(null, true);
                mLogpersist.setEnabled(false);
            } else if (mLastEnabledState) {
                mLogpersist.setEnabled(true);
            }
        }
        if ((currentValue == null) || (currentValue.length() == 0)) {
            currentValue = defaultLogdSizeValue();
        }
        //gatsby 加载res 资源
        String[] values = getResources().getStringArray(R.array.select_logd_size_values);
        String[] titles = getResources().getStringArray(R.array.select_logd_size_titles);
        int index = 2; // punt to second entry if not found
        if (SystemProperties.get("ro.config.low_ram").equals("true")) {
            mLogdSize.setEntries(R.array.select_logd_size_lowram_titles);
            titles = getResources().getStringArray(R.array.select_logd_size_lowram_titles);
            index = 1;
        }
        String[] summaries = getResources().getStringArray(R.array.select_logd_size_summaries);
        for (int i = 0; i < titles.length; i++) {
            if (currentValue.equals(values[i])
                    || currentValue.equals(titles[i])) {
                index = i;
                break;
            }
        }
        mLogdSize.setValue(values[index]);
        mLogdSize.setSummary(summaries[index]);
        mLogdSize.setOnPreferenceChangeListener(this);
    }
}

 二.LogBuffer.cpp　

persist.logd.size
persist.logd.size
ro.logd.size
LOG_BUFFER_SIZE, 即256k
LOG_BUFFER_MIN_SIZE, 即64k

三.默认512K

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--- a/frameworks/base/packages/SettingsLib/res/values-zh-rCN/arrays.xml
+++ b/frameworks/base/packages/SettingsLib/res/values-zh-rCN/arrays.xml
@@ -62,6 +62,7 @@
     <item msgid="8665206199209698501">"关闭"</item>
     <item msgid="1593289376502312923">"64K"</item>
     <item msgid="487545340236145324">"256K"</item>
+    <item msgid="487545340236145324">"512K"</item>
     <item msgid="2423528675294333831">"1M"</item>
     <item msgid="180883774509476541">"4M"</item>
     <item msgid="2803199102589126938">"16M"</item>
@@ -76,6 +77,7 @@
     <item msgid="6921048829791179331">"关闭"</item>
     <item msgid="2969458029344750262">"每个日志缓冲区 64K"</item>
     <item msgid="1342285115665698168">"每个日志缓冲区 256K"</item>
+    <item>"每个日志缓冲区 512K"</item>
     <item msgid="1314234299552254621">"每个日志缓冲区 1M"</item>
     <item msgid="3606047780792894151">"每个日志缓冲区 4M"</item>
     <item msgid="5431354956856655120">"每个日志缓冲区 16M"</item>
diff --git a/frameworks/base/packages/SettingsLib/res/values/arrays.xml b/frameworks/base/packages/SettingsLib/res/values/arrays.xml
old mode 100644
new mode 100755
index 920e061..b57115b
--- a/frameworks/base/packages/SettingsLib/res/values/arrays.xml
+++ b/frameworks/base/packages/SettingsLib/res/values/arrays.xml
@@ -122,6 +122,7 @@
     <string-array name="select_logd_size_values" translatable="false" >
         <item>32768</item>
         <item>65536</item>
+   <item>524288</item>
         <item>262144</item>
         <item>1048576</item>
         <item>4194304</item>
diff --git a/system/core/logd/LogBuffer.cpp b/system/core/logd/LogBuffer.cpp
old mode 100644
new mode 100755
index 0497a89..5a2a597
--- a/system/core/logd/LogBuffer.cpp
+++ b/system/core/logd/LogBuffer.cpp
@@ -97,14 +97,20 @@ void LogBuffer::init() {
     static const char global_tuneable[] = "persist.logd.size"; // Settings App
     static const char global_default[] = "ro.logd.size";       // BoardConfig.mk
  
+   SLOGE("gatsby LogBuffer init");
+
     unsigned long default_size = property_get_size(global_tuneable);
+   SLOGE("000 gatsby default_size ->  %lu .",default_size);
     if (!default_size) {
+       SLOGE("000 gatsby !!!default_size aaa ->  %lu .",default_size);
         default_size = property_get_size(global_default);
+       SLOGE("000 gatsby !!!default_size bbb ->  %lu .",default_size);
         if (!default_size) {
             default_size = property_get_bool("ro.config.low_ram",
                                              BOOL_DEFAULT_FALSE)
                 ? LOG_BUFFER_MIN_SIZE // 64K
                 : LOG_BUFFER_SIZE;    // 256K
+           SLOGE("000 gatsby !!!!!default_size ccc ->  %lu .",default_size);
         }
     }
  
@@ -116,24 +122,32 @@ void LogBuffer::init() {
  
         snprintf(key, sizeof(key), "%s.%s",
                  global_tuneable, android_log_id_to_name(i));
+       //getprop persist.logd.size     
         unsigned long property_size = property_get_size(key);
  
         if (!property_size) {
             snprintf(key, sizeof(key), "%s.%s",
                      global_default, android_log_id_to_name(i));
             property_size = property_get_size(key);
+           SLOGE("111 gatsby global_tuneable ->  %s . android_log_id_to_name(i) -> %s .",global_tuneable,android_log_id_to_name(i));
+           SLOGE("111 gatsby property_size ->  %lu .",property_size);
         }
  
         if (!property_size) {
             property_size = default_size;
+           SLOGE("2222 gatsby property_size ->  %lu .",property_size);
         }
  
         if (!property_size) {
+           //256k
             property_size = LOG_BUFFER_SIZE;
+           SLOGE("333 gatsby property_size ->  %lu .",property_size);
         }
  
         if (setSize(i, property_size)) {
+           //64k
             setSize(i, LOG_BUFFER_MIN_SIZE);
+           SLOGE("444 gatsby property_size ->  %lu .",property_size);
         }
     }
     bool lastMonotonic = monotonic;

 四.Android5.1 抓取系统日志脚本　

4.1.logger.sh

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#!/system/bin/sh
 
FILE_PATH=/mnt/internal_sd/logger
 
FILE_PREFIX_KERNLOG=kernlog
FILE_PREFIX_MAINLOG=mainlog
FILE_PREFIX_RADIOLOG=radiolog
FILE_PREFIX_PPPDLOG=pppdlog
#sleep 30
if [ ! -d $FILE_PATH ]
then
mkdir -p $FILE_PATH
fi
 
rename_logfile()
{
    FILE_PREFIX=$1
    LAST_LAST_LAST_FILE=`busybox find $FILE_PATH/ -name "$FILE_PREFIX-*.log.last.last"`
    LAST_LAST_FILE=`busybox find $FILE_PATH/ -name "$FILE_PREFIX-*.log.last"`
    LAST_FILE=`busybox find $FILE_PATH/ -name "$FILE_PREFIX-*.log"`
    #change log files name
    echo "$LAST_LAST_LAST_FILE $LAST_LAST_FILE $LAST_FILE"
    rm $LAST_LAST_FILE
    mv $LAST_LAST_FILE $LAST_LAST_FILE.last
    mv $LAST_FILE $LAST_FILE.last
}
 
logger_kmsg()
{
    echo "logger $FILE_PREFIX_KERNLOG ..."
    rename_logfile $FILE_PREFIX_KERNLOG
    busybox cat /proc/kmsg > $FILE_PATH/$FILE_PREFIX_KERNLOG-`date +%Y%m%d-%H%M%S`.log
}
 
logger_logcat()
{
    echo "logger $FILE_PREFIX_MAINLOG ..."
    rename_logfile $FILE_PREFIX_MAINLOG
    logcat -b main -b radio -b system  -v time -f $FILE_PATH/$FILE_PREFIX_MAINLOG-`date +%Y%m%d-%H%M%S`.log
}
 
logger_pppd()
{
    echo "logger $FILE_PREFIX_PPPDLOG ..."
    #rename_logfile $FILE_PREFIX_PPPDLOG
    logcat -v time -s pppd > $FILE_PATH/$FILE_PREFIX_PPPDLOG-`date +%Y%m%d-%H%M%S`.log
}
 
logger_radio()
{
    echo "logger $FILE_PREFIX_RADIOLOG ..."
#   rename_logfile $FILE_PREFIX_RADIOLOG
    logcat -v time -b radio -f $FILE_PATH/$FILE_PREFIX_RADIOLOG-`date +%Y%m%d-%H%M%S`.log
}
 
 
 
case "$1" in
kernel)
    logger_kmsg;;
android)
    logger_logcat;;
pppd)
    logger_pppd;;
radio)
    logger_radio;;
*)
    print "error argument, only for kernel, android, radio,pppd\n"
    ;;
esac

4.2.device\rockchip\common\init.rk30board.rc

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service logger_kernel /system/bin/logger.sh kernel
        user root
        group root
        disabled
        oneshot
 
service logger_android /system/bin/logger.sh android
        user root
        group root
        disabled
        oneshot
        
service logger_radio /system/bin/logger.sh radio
        user root
        group root
        disabled
        oneshot
 
service logger_pppd /system/bin/logger.sh pppd
        user root
        group root
        disabled
        oneshot               
 
on property:persist.sys.logger=1
    start logger_kernel
    start logger_android
    start logger_radio
    start logger_pppd

4.3.  a.最大保存5份文件  b.满5份之后删除最旧的一份

        c.Notepad++ 下编辑-文档格式转换-转换为UNIX格式　

 test.sh

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count=5
for i in `seq $(($count+1))`
do
       echo "i is $i"
       if [ ! -f "log/kmsg_$i.log" ]; then
           echo "i is break!"
           break
       fi
done
 
if [ $i -eq $(($count+1)) ]; then
       rm -rf log/kmsg_1.log
       i=$count
       for j in `seq $(($count-1))`
       do
               echo "log/kmsg_$(($j+1)).log log/kmsg_$j.log"
               mv log/kmsg_$(($j+1)).log log/kmsg_$j.log
       done
fi
 
touch  log/kmsg_$i.log
echo `date +%Y.%m.%d.%H.%M.%S` > log/kmsg_$i.log

kmsg.sh

　　

　　

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