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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 <dlfcn.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/system_properties.h>
#include "base/android/sys_utils.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/stringprintf.h"
#include "base/sys_info_internal.h"
#if (__ANDROID_API__ >= 21 /* 5.0 - Lollipop */)
namespace {
typedef int (SystemPropertyGetFunction)(const char*, char*);
SystemPropertyGetFunction* DynamicallyLoadRealSystemPropertyGet() {
// libc.so should already be open, get a handle to it.
void* handle = dlopen("libc.so", RTLD_NOLOAD);
if (!handle) {
LOG(FATAL) << "Cannot dlopen libc.so: " << dlerror();
}
SystemPropertyGetFunction* real_system_property_get =
reinterpret_cast<SystemPropertyGetFunction*>(
dlsym(handle, "__system_property_get"));
if (!real_system_property_get) {
LOG(FATAL) << "Cannot resolve __system_property_get(): " << dlerror();
}
return real_system_property_get;
}
static base::LazyInstance<base::internal::LazySysInfoValue<
SystemPropertyGetFunction*, DynamicallyLoadRealSystemPropertyGet> >::Leaky
g_lazy_real_system_property_get = LAZY_INSTANCE_INITIALIZER;
} // namespace
// Android 'L' removes __system_property_get from the NDK, however it is still
// a hidden symbol in libc. Until we remove all calls of __system_property_get
// from Chrome we work around this by defining a weak stub here, which uses
// dlsym to but ensures that Chrome uses the real system
// implementatation when loaded. http://crbug.com/392191.
BASE_EXPORT int __system_property_get(const char* name, char* value) {
return g_lazy_real_system_property_get.Get().value()(name, value);
}
#endif
namespace {
// Default version of Android to fall back to when actual version numbers
// cannot be acquired. Use the latest Android release with a higher bug fix
// version to avoid unnecessarily comparison errors with the latest release.
// This should be manually kept up-to-date on each Android release.
const int kDefaultAndroidMajorVersion = 6;
const int kDefaultAndroidMinorVersion = 0;
const int kDefaultAndroidBugfixVersion = 99;
// Parse out the OS version numbers from the system properties.
void ParseOSVersionNumbers(const char* os_version_str,
int32_t* major_version,
int32_t* minor_version,
int32_t* 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_t ParseSystemPropertyBytes(const base::StringPiece& str) {
const int64_t KB = 1024;
const int64_t MB = 1024 * KB;
const int64_t GB = 1024 * MB;
if (str.size() == 0u)
return -1;
int64_t 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_t result = 0;
bool parsed = base::StringToInt64(str.substr(0, length), &result);
bool negative = result <= 0;
bool overflow =
result >= std::numeric_limits<int64_t>::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_t MB = 1024 * 1024;
int64_t 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_t>(std::max<int64_t>(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_t MB = 1024 * 1024;
int64_t 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_t>(std::max<int64_t>(16 * MB, result), 512 * MB) / MB;
return static_cast<int>(result);
}
} // anonymous namespace
namespace base {
std::string SysInfo::HardwareModelName() {
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::OperatingSystemName() {
return "Android";
}
std::string SysInfo::OperatingSystemVersion() {
int32_t major, minor, bugfix;
OperatingSystemVersionNumbers(&major, &minor, &bugfix);
return StringPrintf("%d.%d.%d", major, minor, bugfix);
}
void SysInfo::OperatingSystemVersionNumbers(int32_t* major_version,
int32_t* minor_version,
int32_t* 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);
}
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);
}
int SysInfo::DalvikHeapSizeMB() {
static int heap_size = GetDalvikHeapSizeMB();
return heap_size;
}
int SysInfo::DalvikHeapGrowthLimitMB() {
static int heap_growth_limit = GetDalvikHeapGrowthLimitMB();
return heap_growth_limit;
}
static base::LazyInstance<
base::internal::LazySysInfoValue<bool,
android::SysUtils::IsLowEndDeviceFromJni> >::Leaky
g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER;
bool SysInfo::IsLowEndDevice() {
return g_lazy_low_end_device.Get().value();
}
} // namespace base
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