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// Copyright 2011 The Chromium Authors
// 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 <type_traits>
#include "base/byte_size.h"
#include "base/check.h"
#include "base/files/file_util.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"
namespace {
base::ByteSize AmountOfMemory(int pages_name) {
long pages = sysconf(pages_name);
long page_size = sysconf(_SC_PAGESIZE);
if (pages < 0 || page_size < 0) {
return base::ByteSize(0);
}
return base::ByteSize(base::checked_cast<unsigned long>(page_size)) * pages;
}
base::ByteSize AmountOfPhysicalMemory() {
return AmountOfMemory(_SC_PHYS_PAGES);
}
using LazyPhysicalMemory =
base::internal::LazySysInfoValue<base::ByteSize, AmountOfPhysicalMemory>;
} // namespace
namespace base {
// static
ByteSize SysInfo::AmountOfTotalPhysicalMemoryImpl() {
static_assert(std::is_trivially_destructible<LazyPhysicalMemory>::value);
static LazyPhysicalMemory physical_memory;
return physical_memory.value();
}
// static
ByteSize SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
SystemMemoryInfo info;
if (!GetSystemMemoryInfo(&info)) {
return ByteSize(0);
}
return AmountOfAvailablePhysicalMemory(info);
}
// static
ByteSize SysInfo::AmountOfAvailablePhysicalMemory(
const SystemMemoryInfo& 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).
if (info.available.is_zero()) {
return info.free + info.reclaimable + info.inactive_file;
} else if (info.available > info.active_file) {
return ByteSize::FromByteSizeDelta(info.available - info.active_file);
} else {
return ByteSize(0);
}
}
// static
std::string SysInfo::CPUModelName() {
#if BUILDFLAG(IS_CHROMEOS) && 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 !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_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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