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// Copyright (c) 2011 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/system/sys_info.h"
#include <stddef.h>
#include <stdint.h>
#include <limits>
#include <sstream>
#include "base/check.h"
#include "base/files/file_util.h"
#include "base/lazy_instance.h"
#include "base/notreached.h"
#include "base/numerics/safe_conversions.h"
#include "base/process/process_metrics.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/system/sys_info_internal.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
namespace {
int64_t AmountOfMemory(int pages_name) {
long pages = sysconf(pages_name);
long page_size = sysconf(_SC_PAGESIZE);
if (pages == -1 || page_size == -1) {
NOTREACHED();
return 0;
}
return static_cast<int64_t>(pages) * page_size;
}
int64_t AmountOfPhysicalMemory() {
return AmountOfMemory(_SC_PHYS_PAGES);
}
base::LazyInstance<
base::internal::LazySysInfoValue<int64_t, AmountOfPhysicalMemory>>::Leaky
g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace base {
// static
int64_t SysInfo::AmountOfPhysicalMemoryImpl() {
return g_lazy_physical_memory.Get().value();
}
// static
int64_t SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
SystemMemoryInfoKB info;
if (!GetSystemMemoryInfo(&info))
return 0;
return AmountOfAvailablePhysicalMemory(info);
}
// static
int64_t SysInfo::AmountOfAvailablePhysicalMemory(
const SystemMemoryInfoKB& info) {
// See details here:
// https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
// The fallback logic (when there is no MemAvailable) would be more precise
// if we had info about zones watermarks (/proc/zoneinfo).
int64_t res_kb = info.available != 0
? info.available - info.active_file
: info.free + info.reclaimable + info.inactive_file;
return res_kb * 1024;
}
// static
std::string SysInfo::CPUModelName() {
#if (BUILDFLAG(IS_CHROMEOS_ASH) || BUILDFLAG(IS_CHROMEOS_LACROS)) && \
defined(ARCH_CPU_ARMEL)
const char kCpuModelPrefix[] = "Hardware";
#else
const char kCpuModelPrefix[] = "model name";
#endif
std::string contents;
ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
DCHECK(!contents.empty());
if (!contents.empty()) {
std::istringstream iss(contents);
std::string line;
while (std::getline(iss, line)) {
if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
size_t pos = line.find(": ");
return line.substr(pos + 2);
}
}
}
#if defined(ARCH_CPU_ARMEL)
// /proc/cpuinfo does not have a defined ABI and so devices may fall
// through without a model name.
// For ARM devices use /sys/devices/socX/soc_id
//
// https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-soc:
// On many of ARM based silicon with SMCCC v1.2+ compliant firmware
// this will contain the SOC ID appended to the family attribute
// to ensure there is no conflict in this namespace across various
// vendors. The format is "jep106:XXYY:ZZZZ" where XX is identity
// code, YY is continuation code and ZZZZ is the SOC ID.
const char kSocIdDirectory[] = "/sys/devices/soc%u";
const char kSocIdFile[] = "/sys/devices/soc%u/soc_id";
const char kJEP106[] = "jep106";
// There can be multiple /sys/bus/soc/devices/socX on a system.
// Iterate through until one with jep106:XXYY:ZZZZ is found.
for (int soc_instance = 0;; ++soc_instance) {
if (!PathExists(
FilePath(base::StringPrintf(kSocIdDirectory, soc_instance))))
break;
std::string soc_id;
ReadFileToString(FilePath(base::StringPrintf(kSocIdFile, soc_instance)),
&soc_id);
if (soc_id.find(kJEP106) == 0)
return soc_id;
}
#endif
return std::string();
}
#if !defined(OS_ANDROID)
// static
SysInfo::HardwareInfo SysInfo::GetHardwareInfoSync() {
static const size_t kMaxStringSize = 100u;
HardwareInfo info;
std::string data;
if (ReadFileToStringWithMaxSize(
FilePath("/sys/devices/virtual/dmi/id/sys_vendor"), &data,
kMaxStringSize)) {
TrimWhitespaceASCII(data, TrimPositions::TRIM_ALL, &info.manufacturer);
}
if (ReadFileToStringWithMaxSize(
FilePath("/sys/devices/virtual/dmi/id/product_name"), &data,
kMaxStringSize)) {
TrimWhitespaceASCII(data, TrimPositions::TRIM_ALL, &info.model);
}
DCHECK(IsStringUTF8(info.manufacturer));
DCHECK(IsStringUTF8(info.model));
return info;
}
#endif
} // namespace base
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