152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
// Copyright 2011 The Chromium Authors
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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 <stddef.h>
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#include <stdint.h>
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#include <algorithm>
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#include <limits>
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#include <sstream>
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#include "base/check.h"
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#include "base/files/file_util.h"
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#include "base/lazy_instance.h"
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#include "base/notreached.h"
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#include "base/numerics/safe_conversions.h"
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#include "base/process/process_metrics.h"
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#include "base/strings/string_number_conversions.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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#include "build/build_config.h"
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namespace {
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uint64_t AmountOfMemory(int pages_name) {
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long pages = sysconf(pages_name);
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long page_size = sysconf(_SC_PAGESIZE);
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if (pages < 0 || page_size < 0)
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return 0;
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return static_cast<uint64_t>(pages) * static_cast<uint64_t>(page_size);
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}
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uint64_t AmountOfPhysicalMemory() {
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return AmountOfMemory(_SC_PHYS_PAGES);
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}
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base::LazyInstance<
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base::internal::LazySysInfoValue<uint64_t, AmountOfPhysicalMemory>>::Leaky
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g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
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} // namespace
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namespace base {
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// static
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uint64_t SysInfo::AmountOfPhysicalMemoryImpl() {
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return g_lazy_physical_memory.Get().value();
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}
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// static
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uint64_t SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
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SystemMemoryInfoKB info;
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if (!GetSystemMemoryInfo(&info))
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return 0;
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return AmountOfAvailablePhysicalMemory(info);
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}
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// static
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uint64_t SysInfo::AmountOfAvailablePhysicalMemory(
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const SystemMemoryInfoKB& info) {
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// See details here:
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// https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
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// The fallback logic (when there is no MemAvailable) would be more precise
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// if we had info about zones watermarks (/proc/zoneinfo).
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int res_kb = info.available != 0
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? std::max(info.available - info.active_file, 0)
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: info.free + info.reclaimable + info.inactive_file;
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return checked_cast<uint64_t>(res_kb) * 1024;
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}
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// static
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std::string SysInfo::CPUModelName() {
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#if BUILDFLAG(IS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
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const char kCpuModelPrefix[] = "Hardware";
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#else
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const char kCpuModelPrefix[] = "model name";
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#endif
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std::string contents;
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ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
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DCHECK(!contents.empty());
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if (!contents.empty()) {
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std::istringstream iss(contents);
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std::string line;
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while (std::getline(iss, line)) {
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if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
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size_t pos = line.find(": ");
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return line.substr(pos + 2);
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}
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}
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}
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#if defined(ARCH_CPU_ARMEL)
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// /proc/cpuinfo does not have a defined ABI and so devices may fall
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// through without a model name.
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// For ARM devices use /sys/devices/socX/soc_id
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//
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// https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-soc:
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// On many of ARM based silicon with SMCCC v1.2+ compliant firmware
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// this will contain the SOC ID appended to the family attribute
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// to ensure there is no conflict in this namespace across various
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// vendors. The format is "jep106:XXYY:ZZZZ" where XX is identity
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// code, YY is continuation code and ZZZZ is the SOC ID.
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const char kSocIdDirectory[] = "/sys/devices/soc%u";
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const char kSocIdFile[] = "/sys/devices/soc%u/soc_id";
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const char kJEP106[] = "jep106";
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// There can be multiple /sys/bus/soc/devices/socX on a system.
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// Iterate through until one with jep106:XXYY:ZZZZ is found.
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for (int soc_instance = 0;; ++soc_instance) {
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if (!PathExists(
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FilePath(base::StringPrintf(kSocIdDirectory, soc_instance))))
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break;
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std::string soc_id;
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ReadFileToString(FilePath(base::StringPrintf(kSocIdFile, soc_instance)),
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&soc_id);
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if (soc_id.find(kJEP106) == 0)
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return soc_id;
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}
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#endif
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return std::string();
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}
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#if !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_ANDROID)
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// static
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SysInfo::HardwareInfo SysInfo::GetHardwareInfoSync() {
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static const size_t kMaxStringSize = 100u;
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HardwareInfo info;
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std::string data;
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if (ReadFileToStringWithMaxSize(
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FilePath("/sys/devices/virtual/dmi/id/sys_vendor"), &data,
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kMaxStringSize)) {
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TrimWhitespaceASCII(data, TrimPositions::TRIM_ALL, &info.manufacturer);
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}
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if (ReadFileToStringWithMaxSize(
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FilePath("/sys/devices/virtual/dmi/id/product_name"), &data,
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kMaxStringSize)) {
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TrimWhitespaceASCII(data, TrimPositions::TRIM_ALL, &info.model);
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}
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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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#endif
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} // namespace base
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