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41 results

LogBuffer.cpp

Blame
    • Mark Salyzyn's avatar
      987f1e0d
      logd: cleanup · 987f1e0d
      Mark Salyzyn authored
      - simplify access and control exposure to class list
      - indent
      - compile warning
      - Follow standard naming convention for variables and methods
      - merge common fragments
      - Side Effects: none
      
      (cherry pick from commit e72c6e43)
      
      Bug: 17526159
      Change-Id: I74796043ac34753c6dd10018719ebc0bcd94e010
      987f1e0d
      History
      logd: cleanup
      Mark Salyzyn authored
      - simplify access and control exposure to class list
      - indent
      - compile warning
      - Follow standard naming convention for variables and methods
      - merge common fragments
      - Side Effects: none
      
      (cherry pick from commit e72c6e43)
      
      Bug: 17526159
      Change-Id: I74796043ac34753c6dd10018719ebc0bcd94e010
    LogBuffer.cpp 14.37 KiB
    /*
     * Copyright (C) 2012-2014 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.
     */
    
    #include <ctype.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <sys/user.h>
    #include <time.h>
    #include <unistd.h>
    
    #include <cutils/properties.h>
    #include <log/logger.h>
    
    #include "LogBuffer.h"
    #include "LogReader.h"
    #include "LogStatistics.h"
    #include "LogWhiteBlackList.h"
    
    // Default
    #define LOG_BUFFER_SIZE (256 * 1024) // Tuned on a per-platform basis here?
    #define log_buffer_size(id) mMaxSize[id]
    #define LOG_BUFFER_MIN_SIZE (64 * 1024UL)
    #define LOG_BUFFER_MAX_SIZE (256 * 1024 * 1024UL)
    
    static bool valid_size(unsigned long value) {
        if ((value < LOG_BUFFER_MIN_SIZE) || (LOG_BUFFER_MAX_SIZE < value)) {
            return false;
        }
    
        long pages = sysconf(_SC_PHYS_PAGES);
        if (pages < 1) {
            return true;
        }
    
        long pagesize = sysconf(_SC_PAGESIZE);
        if (pagesize <= 1) {
            pagesize = PAGE_SIZE;
        }
    
        // maximum memory impact a somewhat arbitrary ~3%
        pages = (pages + 31) / 32;
        unsigned long maximum = pages * pagesize;
    
        if ((maximum < LOG_BUFFER_MIN_SIZE) || (LOG_BUFFER_MAX_SIZE < maximum)) {
            return true;
        }
    
        return value <= maximum;
    }
    
    static unsigned long property_get_size(const char *key) {
        char property[PROPERTY_VALUE_MAX];
        property_get(key, property, "");
    
        char *cp;
        unsigned long value = strtoul(property, &cp, 10);