base/sys_info_android.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/sys_info.h"
   6
   7 #include <sys/system_properties.h>
   8
   9 #include "base/logging.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/string_piece.h"
  12 #include "base/strings/stringprintf.h"
  13
  14 namespace {
  15
  16 // Default version of Android to fall back to when actual version numbers
  17 // cannot be acquired.
  18 // TODO(dfalcantara): Keep this reasonably up to date with the latest publicly
  19 //                    available version of Android.
  20 static const int kDefaultAndroidMajorVersion = 4;
  21 static const int kDefaultAndroidMinorVersion = 0;
  22 static const int kDefaultAndroidBugfixVersion = 3;
  23
  24 // Parse out the OS version numbers from the system properties.
  25 void ParseOSVersionNumbers(const char* os_version_str,
  26                            int32 *major_version,
  27                            int32 *minor_version,
  28                            int32 *bugfix_version) {
  29   if (os_version_str[0]) {
  30     // Try to parse out the version numbers from the string.
  31     int num_read = sscanf(os_version_str, "%d.%d.%d", major_version,
  32                           minor_version, bugfix_version);
  33
  34     if (num_read > 0) {
  35       // If we don't have a full set of version numbers, make the extras 0.
  36       if (num_read < 2) *minor_version = 0;
  37       if (num_read < 3) *bugfix_version = 0;
  38       return;
  39     }
  40   }
  41
  42   // For some reason, we couldn't parse the version number string.
  43   *major_version = kDefaultAndroidMajorVersion;
  44   *minor_version = kDefaultAndroidMinorVersion;
  45   *bugfix_version = kDefaultAndroidBugfixVersion;
  46 }
  47
  48 // Parses a system property (specified with unit 'k','m' or 'g').
  49 // Returns a value in bytes.
  50 // Returns -1 if the string could not be parsed.
  51 int64 ParseSystemPropertyBytes(const base::StringPiece& str) {
  52   const int64 KB = 1024;
  53   const int64 MB = 1024 * KB;
  54   const int64 GB = 1024 * MB;
  55   if (str.size() == 0u)
  56     return -1;
  57   int64 unit_multiplier = 1;
  58   size_t length = str.size();
  59   if (str[length - 1] == 'k') {
  60     unit_multiplier = KB;
  61     length--;
  62   } else if (str[length - 1] == 'm') {
  63     unit_multiplier = MB;
  64     length--;
  65   } else if (str[length - 1] == 'g') {
  66     unit_multiplier = GB;
  67     length--;
  68   }
  69   int64 result = 0;
  70   bool parsed = base::StringToInt64(str.substr(0, length), &result);
  71   bool negative = result <= 0;
  72   bool overflow = result >= std::numeric_limits<int64>::max() / unit_multiplier;
  73   if (!parsed || negative || overflow)
  74     return -1;
  75   return result * unit_multiplier;
  76 }
  77
  78 int GetDalvikHeapSizeMB() {
  79   char heap_size_str[PROP_VALUE_MAX];
  80   __system_property_get("dalvik.vm.heapsize", heap_size_str);
  81   // dalvik.vm.heapsize property is writable by a root user.
  82   // Clamp it to reasonable range as a sanity check,
  83   // a typical android device will never have less than 48MB.
  84   const int64 MB = 1024 * 1024;
  85   int64 result = ParseSystemPropertyBytes(heap_size_str);
  86   if (result == -1) {
  87      // We should consider not exposing these values if they are not reliable.
  88      LOG(ERROR) << "Can't parse dalvik.vm.heapsize: " << heap_size_str;
  89      result = base::SysInfo::AmountOfPhysicalMemoryMB() / 3;
  90   }
  91   result = std::min<int64>(std::max<int64>(32 * MB, result), 1024 * MB) / MB;
  92   return static_cast<int>(result);
  93 }
  94
  95 int GetDalvikHeapGrowthLimitMB() {
  96   char heap_size_str[PROP_VALUE_MAX];
  97   __system_property_get("dalvik.vm.heapgrowthlimit", heap_size_str);
  98   // dalvik.vm.heapgrowthlimit property is writable by a root user.
  99   // Clamp it to reasonable range as a sanity check,
 100   // a typical android device will never have less than 24MB.
 101   const int64 MB = 1024 * 1024;
 102   int64 result = ParseSystemPropertyBytes(heap_size_str);
 103   if (result == -1) {
 104      // We should consider not exposing these values if they are not reliable.
 105      LOG(ERROR) << "Can't parse dalvik.vm.heapgrowthlimit: " << heap_size_str;
 106      result = base::SysInfo::AmountOfPhysicalMemoryMB() / 6;
 107   }
 108   result = std::min<int64>(std::max<int64>(16 * MB, result), 512 * MB) / MB;
 109   return static_cast<int>(result);
 110 }
 111
 112 }  // anonymous namespace
 113
 114 namespace base {
 115
 116 std::string SysInfo::OperatingSystemName() {
 117   return "Android";
 118 }
 119
 120 std::string SysInfo::GetAndroidBuildCodename() {
 121   char os_version_codename_str[PROP_VALUE_MAX];
 122   __system_property_get("ro.build.version.codename", os_version_codename_str);
 123   return std::string(os_version_codename_str);
 124 }
 125
 126 std::string SysInfo::GetAndroidBuildID() {
 127   char os_build_id_str[PROP_VALUE_MAX];
 128   __system_property_get("ro.build.id", os_build_id_str);
 129   return std::string(os_build_id_str);
 130 }
 131
 132 std::string SysInfo::GetDeviceName() {
 133   char device_model_str[PROP_VALUE_MAX];
 134   __system_property_get("ro.product.model", device_model_str);
 135   return std::string(device_model_str);
 136 }
 137
 138 std::string SysInfo::OperatingSystemVersion() {
 139   int32 major, minor, bugfix;
 140   OperatingSystemVersionNumbers(&major, &minor, &bugfix);
 141   return StringPrintf("%d.%d.%d", major, minor, bugfix);
 142 }
 143
 144 void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
 145                                             int32* minor_version,
 146                                             int32* bugfix_version) {
 147   // Read the version number string out from the properties.
 148   char os_version_str[PROP_VALUE_MAX];
 149   __system_property_get("ro.build.version.release", os_version_str);
 150
 151   // Parse out the numbers.
 152   ParseOSVersionNumbers(os_version_str, major_version, minor_version,
 153                         bugfix_version);
 154 }
 155
 156 int SysInfo::DalvikHeapSizeMB() {
 157   static int heap_size = GetDalvikHeapSizeMB();
 158   return heap_size;
 159 }
 160
 161 int SysInfo::DalvikHeapGrowthLimitMB() {
 162   static int heap_growth_limit = GetDalvikHeapGrowthLimitMB();
 163   return heap_growth_limit;
 164 }
 165
 166
 167 }  // namespace base