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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/sys_info.h"
#include <sys/system_properties.h>
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/stringprintf.h"
namespace {
// Default version of Android to fall back to when actual version numbers
// cannot be acquired.
// TODO(dfalcantara): Keep this reasonably up to date with the latest publicly
// available version of Android.
const int kDefaultAndroidMajorVersion = 4;
const int kDefaultAndroidMinorVersion = 3;
const int kDefaultAndroidBugfixVersion = 0;
// Parse out the OS version numbers from the system properties.
void ParseOSVersionNumbers(const char* os_version_str,
int32 *major_version,
int32 *minor_version,
int32 *bugfix_version) {
if (os_version_str[0]) {
// Try to parse out the version numbers from the string.
int num_read = sscanf(os_version_str, "%d.%d.%d", major_version,
minor_version, bugfix_version);
if (num_read > 0) {
// If we don't have a full set of version numbers, make the extras 0.
if (num_read < 2) *minor_version = 0;
if (num_read < 3) *bugfix_version = 0;
return;
}
}
// For some reason, we couldn't parse the version number string.
*major_version = kDefaultAndroidMajorVersion;
*minor_version = kDefaultAndroidMinorVersion;
*bugfix_version = kDefaultAndroidBugfixVersion;
}
// Parses a system property (specified with unit 'k','m' or 'g').
// Returns a value in bytes.
// Returns -1 if the string could not be parsed.
int64 ParseSystemPropertyBytes(const base::StringPiece& str) {
const int64 KB = 1024;
const int64 MB = 1024 * KB;
const int64 GB = 1024 * MB;
if (str.size() == 0u)
return -1;
int64 unit_multiplier = 1;
size_t length = str.size();
if (str[length - 1] == 'k') {
unit_multiplier = KB;
length--;
} else if (str[length - 1] == 'm') {
unit_multiplier = MB;
length--;
} else if (str[length - 1] == 'g') {
unit_multiplier = GB;
length--;
}
int64 result = 0;
bool parsed = base::StringToInt64(str.substr(0, length), &result);
bool negative = result <= 0;
bool overflow = result >= std::numeric_limits<int64>::max() / unit_multiplier;
if (!parsed || negative || overflow)
return -1;
return result * unit_multiplier;
}
int GetDalvikHeapSizeMB() {
char heap_size_str[PROP_VALUE_MAX];
__system_property_get("dalvik.vm.heapsize", heap_size_str);
// dalvik.vm.heapsize property is writable by a root user.
// Clamp it to reasonable range as a sanity check,
// a typical android device will never have less than 48MB.
const int64 MB = 1024 * 1024;
int64 result = ParseSystemPropertyBytes(heap_size_str);
if (result == -1) {
// We should consider not exposing these values if they are not reliable.
LOG(ERROR) << "Can't parse dalvik.vm.heapsize: " << heap_size_str;
result = base::SysInfo::AmountOfPhysicalMemoryMB() / 3;
}
result = std::min<int64>(std::max<int64>(32 * MB, result), 1024 * MB) / MB;
return static_cast<int>(result);
}
int GetDalvikHeapGrowthLimitMB() {
char heap_size_str[PROP_VALUE_MAX];
__system_property_get("dalvik.vm.heapgrowthlimit", heap_size_str);
// dalvik.vm.heapgrowthlimit property is writable by a root user.
// Clamp it to reasonable range as a sanity check,
// a typical android device will never have less than 24MB.
const int64 MB = 1024 * 1024;
int64 result = ParseSystemPropertyBytes(heap_size_str);
if (result == -1) {
// We should consider not exposing these values if they are not reliable.
LOG(ERROR) << "Can't parse dalvik.vm.heapgrowthlimit: " << heap_size_str;
result = base::SysInfo::AmountOfPhysicalMemoryMB() / 6;
}
result = std::min<int64>(std::max<int64>(16 * MB, result), 512 * MB) / MB;
return static_cast<int>(result);
}
} // anonymous namespace
namespace base {
std::string SysInfo::OperatingSystemName() {
return "Android";
}
std::string SysInfo::GetAndroidBuildCodename() {
char os_version_codename_str[PROP_VALUE_MAX];
__system_property_get("ro.build.version.codename", os_version_codename_str);
return std::string(os_version_codename_str);
}
std::string SysInfo::GetAndroidBuildID() {
char os_build_id_str[PROP_VALUE_MAX];
__system_property_get("ro.build.id", os_build_id_str);
return std::string(os_build_id_str);
}
std::string SysInfo::GetDeviceName() {
char device_model_str[PROP_VALUE_MAX];
__system_property_get("ro.product.model", device_model_str);
return std::string(device_model_str);
}
std::string SysInfo::OperatingSystemVersion() {
int32 major, minor, bugfix;
OperatingSystemVersionNumbers(&major, &minor, &bugfix);
return StringPrintf("%d.%d.%d", major, minor, bugfix);
}
void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
int32* minor_version,
int32* bugfix_version) {
// Read the version number string out from the properties.
char os_version_str[PROP_VALUE_MAX];
__system_property_get("ro.build.version.release", os_version_str);
// Parse out the numbers.
ParseOSVersionNumbers(os_version_str, major_version, minor_version,
bugfix_version);
}
int SysInfo::DalvikHeapSizeMB() {
static int heap_size = GetDalvikHeapSizeMB();
return heap_size;
}
int SysInfo::DalvikHeapGrowthLimitMB() {
static int heap_growth_limit = GetDalvikHeapGrowthLimitMB();
return heap_growth_limit;
}
} // namespace base
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