265 lines
9.2 KiB
C++
265 lines
9.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/system/sys_info.h"
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#include <dlfcn.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/system_properties.h>
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#include "base/android/jni_android.h"
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#include "base/android/sys_utils.h"
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#include "base/lazy_instance.h"
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#include "base/logging.h"
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#include "base/strings/string_number_conversions.h"
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#include "base/strings/string_piece.h"
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#include "base/strings/string_util.h"
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#include "base/strings/stringprintf.h"
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#include "base/system/sys_info_internal.h"
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#if (__ANDROID_API__ >= 21 /* 5.0 - Lollipop */)
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namespace {
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typedef int(SystemPropertyGetFunction)(const char*, char*);
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SystemPropertyGetFunction* DynamicallyLoadRealSystemPropertyGet() {
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// libc.so should already be open, get a handle to it.
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void* handle = dlopen("libc.so", RTLD_NOLOAD);
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if (!handle) {
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LOG(FATAL) << "Cannot dlopen libc.so: " << dlerror();
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}
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SystemPropertyGetFunction* real_system_property_get =
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reinterpret_cast<SystemPropertyGetFunction*>(
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dlsym(handle, "__system_property_get"));
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if (!real_system_property_get) {
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LOG(FATAL) << "Cannot resolve __system_property_get(): " << dlerror();
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}
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return real_system_property_get;
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}
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static base::LazyInstance<base::internal::LazySysInfoValue<
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SystemPropertyGetFunction*,
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DynamicallyLoadRealSystemPropertyGet>>::Leaky
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g_lazy_real_system_property_get = LAZY_INSTANCE_INITIALIZER;
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} // namespace
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// Android 'L' removes __system_property_get from the NDK, however it is still
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// a hidden symbol in libc. Until we remove all calls of __system_property_get
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// from Chrome we work around this by defining a weak stub here, which uses
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// dlsym to but ensures that Chrome uses the real system
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// implementatation when loaded. http://crbug.com/392191.
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BASE_EXPORT int __system_property_get(const char* name, char* value) {
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return g_lazy_real_system_property_get.Get().value()(name, value);
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}
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#endif
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namespace {
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// Default version of Android to fall back to when actual version numbers
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// cannot be acquired. Use the latest Android release with a higher bug fix
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// version to avoid unnecessarily comparison errors with the latest release.
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// This should be manually kept up to date on each Android release.
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const int kDefaultAndroidMajorVersion = 10;
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const int kDefaultAndroidMinorVersion = 0;
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const int kDefaultAndroidBugfixVersion = 99;
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// Get and parse out the OS version numbers from the system properties.
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// Note if parse fails, the "default" version is returned as fallback.
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void GetOsVersionStringAndNumbers(std::string* version_string,
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int32_t* major_version,
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int32_t* minor_version,
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int32_t* bugfix_version) {
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// Read the version number string out from the properties.
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char os_version_str[PROP_VALUE_MAX];
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__system_property_get("ro.build.version.release", os_version_str);
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if (os_version_str[0]) {
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// Try to parse out the version numbers from the string.
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int num_read = sscanf(os_version_str, "%d.%d.%d", major_version,
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minor_version, bugfix_version);
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if (num_read > 0) {
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// If we don't have a full set of version numbers, make the extras 0.
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if (num_read < 2)
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*minor_version = 0;
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if (num_read < 3)
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*bugfix_version = 0;
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*version_string = std::string(os_version_str);
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return;
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}
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}
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// For some reason, we couldn't parse the version number string.
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*major_version = kDefaultAndroidMajorVersion;
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*minor_version = kDefaultAndroidMinorVersion;
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*bugfix_version = kDefaultAndroidBugfixVersion;
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*version_string = ::base::StringPrintf("%d.%d.%d", *major_version,
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*minor_version, *bugfix_version);
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}
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// Parses a system property (specified with unit 'k','m' or 'g').
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// Returns a value in bytes.
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// Returns -1 if the string could not be parsed.
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int64_t ParseSystemPropertyBytes(const base::StringPiece& str) {
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const int64_t KB = 1024;
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const int64_t MB = 1024 * KB;
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const int64_t GB = 1024 * MB;
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if (str.size() == 0u)
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return -1;
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int64_t unit_multiplier = 1;
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size_t length = str.size();
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if (str[length - 1] == 'k') {
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unit_multiplier = KB;
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length--;
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} else if (str[length - 1] == 'm') {
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unit_multiplier = MB;
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length--;
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} else if (str[length - 1] == 'g') {
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unit_multiplier = GB;
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length--;
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}
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int64_t result = 0;
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bool parsed = base::StringToInt64(str.substr(0, length), &result);
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bool negative = result <= 0;
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bool overflow =
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result >= std::numeric_limits<int64_t>::max() / unit_multiplier;
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if (!parsed || negative || overflow)
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return -1;
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return result * unit_multiplier;
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}
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int GetDalvikHeapSizeMB() {
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char heap_size_str[PROP_VALUE_MAX];
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__system_property_get("dalvik.vm.heapsize", heap_size_str);
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// dalvik.vm.heapsize property is writable by a root user.
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// Clamp it to reasonable range as a sanity check,
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// a typical android device will never have less than 48MB.
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const int64_t MB = 1024 * 1024;
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int64_t result = ParseSystemPropertyBytes(heap_size_str);
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if (result == -1) {
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// We should consider not exposing these values if they are not reliable.
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LOG(ERROR) << "Can't parse dalvik.vm.heapsize: " << heap_size_str;
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result = base::SysInfo::AmountOfPhysicalMemoryMB() / 3;
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}
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result =
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std::min<int64_t>(std::max<int64_t>(32 * MB, result), 1024 * MB) / MB;
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return static_cast<int>(result);
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}
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int GetDalvikHeapGrowthLimitMB() {
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char heap_size_str[PROP_VALUE_MAX];
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__system_property_get("dalvik.vm.heapgrowthlimit", heap_size_str);
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// dalvik.vm.heapgrowthlimit property is writable by a root user.
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// Clamp it to reasonable range as a sanity check,
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// a typical android device will never have less than 24MB.
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const int64_t MB = 1024 * 1024;
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int64_t result = ParseSystemPropertyBytes(heap_size_str);
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if (result == -1) {
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// We should consider not exposing these values if they are not reliable.
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LOG(ERROR) << "Can't parse dalvik.vm.heapgrowthlimit: " << heap_size_str;
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result = base::SysInfo::AmountOfPhysicalMemoryMB() / 6;
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}
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result = std::min<int64_t>(std::max<int64_t>(16 * MB, result), 512 * MB) / MB;
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return static_cast<int>(result);
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}
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std::string HardwareManufacturerName() {
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char device_model_str[PROP_VALUE_MAX];
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__system_property_get("ro.product.manufacturer", device_model_str);
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return std::string(device_model_str);
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}
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} // anonymous namespace
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namespace base {
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std::string SysInfo::HardwareModelName() {
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char device_model_str[PROP_VALUE_MAX];
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__system_property_get("ro.product.model", device_model_str);
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return std::string(device_model_str);
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}
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std::string SysInfo::OperatingSystemName() {
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return "Android";
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}
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std::string SysInfo::OperatingSystemVersion() {
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std::string version_string;
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int32_t major, minor, bugfix;
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GetOsVersionStringAndNumbers(&version_string, &major, &minor, &bugfix);
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return version_string;
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}
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void SysInfo::OperatingSystemVersionNumbers(int32_t* major_version,
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int32_t* minor_version,
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int32_t* bugfix_version) {
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std::string version_string;
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GetOsVersionStringAndNumbers(&version_string, major_version, minor_version,
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bugfix_version);
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}
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std::string SysInfo::GetAndroidBuildCodename() {
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char os_version_codename_str[PROP_VALUE_MAX];
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__system_property_get("ro.build.version.codename", os_version_codename_str);
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return std::string(os_version_codename_str);
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}
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std::string SysInfo::GetAndroidBuildID() {
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char os_build_id_str[PROP_VALUE_MAX];
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__system_property_get("ro.build.id", os_build_id_str);
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return std::string(os_build_id_str);
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}
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std::string SysInfo::GetAndroidHardwareEGL() {
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char os_hardware_egl_str[PROP_VALUE_MAX];
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__system_property_get("ro.hardware.egl", os_hardware_egl_str);
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return std::string(os_hardware_egl_str);
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}
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int SysInfo::DalvikHeapSizeMB() {
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static int heap_size = GetDalvikHeapSizeMB();
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return heap_size;
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}
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int SysInfo::DalvikHeapGrowthLimitMB() {
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static int heap_growth_limit = GetDalvikHeapGrowthLimitMB();
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return heap_growth_limit;
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}
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static base::LazyInstance<base::internal::LazySysInfoValue<
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bool,
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android::SysUtils::IsLowEndDeviceFromJni>>::Leaky g_lazy_low_end_device =
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LAZY_INSTANCE_INITIALIZER;
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bool SysInfo::IsLowEndDeviceImpl() {
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// This code might be used in some environments
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// which might not have a Java environment.
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// Note that we need to call the Java version here.
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// There exists a complete native implementation in
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// sys_info.cc but calling that here would mean that
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// the Java code and the native code would call different
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// implementations which could give different results.
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// Also the Java code cannot depend on the native code
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// since it might not be loaded yet.
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if (!base::android::IsVMInitialized())
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return false;
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return g_lazy_low_end_device.Get().value();
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}
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// static
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SysInfo::HardwareInfo SysInfo::GetHardwareInfoSync() {
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HardwareInfo info;
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info.manufacturer = HardwareManufacturerName();
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info.model = HardwareModelName();
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DCHECK(IsStringUTF8(info.manufacturer));
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DCHECK(IsStringUTF8(info.model));
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return info;
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}
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} // namespace base
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