86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
// Copyright (c) 2011 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/sys_info.h"
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#include <limits>
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#include "base/file_util.h"
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#include "base/logging.h"
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#include "base/strings/string_number_conversions.h"
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namespace {
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int64 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 == -1 || page_size == -1) {
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NOTREACHED();
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return 0;
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}
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return static_cast<int64>(pages) * page_size;
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}
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} // namespace
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namespace base {
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// static
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int64 SysInfo::AmountOfPhysicalMemory() {
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return AmountOfMemory(_SC_PHYS_PAGES);
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}
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// static
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int64 SysInfo::AmountOfAvailablePhysicalMemory() {
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return AmountOfMemory(_SC_AVPHYS_PAGES);
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}
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// static
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size_t SysInfo::MaxSharedMemorySize() {
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static int64 limit;
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static bool limit_valid = false;
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if (!limit_valid) {
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std::string contents;
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file_util::ReadFileToString(FilePath("/proc/sys/kernel/shmmax"), &contents);
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DCHECK(!contents.empty());
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if (!contents.empty() && contents[contents.length() - 1] == '\n') {
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contents.erase(contents.length() - 1);
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}
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if (base::StringToInt64(contents, &limit)) {
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DCHECK(limit >= 0);
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DCHECK(static_cast<uint64>(limit) <= std::numeric_limits<size_t>::max());
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limit_valid = true;
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} else {
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NOTREACHED();
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return 0;
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}
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}
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return static_cast<size_t>(limit);
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}
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// static
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std::string SysInfo::CPUModelName() {
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#if defined(OS_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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file_util::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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return std::string();
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}
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} // namespace base
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