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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/sys_info.h"
#include <limits>
#include "base/files/file_util.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/sys_info_internal.h"
namespace {
int64 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>(pages) * page_size;
}
int64 AmountOfPhysicalMemory() {
return AmountOfMemory(_SC_PHYS_PAGES);
}
size_t MaxSharedMemorySize() {
std::string contents;
base::ReadFileToString(base::FilePath("/proc/sys/kernel/shmmax"), &contents);
DCHECK(!contents.empty());
if (!contents.empty() && contents[contents.length() - 1] == '\n') {
contents.erase(contents.length() - 1);
}
uint64 limit;
if (!base::StringToUint64(contents, &limit)) {
limit = 0;
}
if (limit > std::numeric_limits<size_t>::max()) {
limit = 0;
}
DCHECK(limit > 0);
return static_cast<size_t>(limit);
}
base::LazyInstance<
base::internal::LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<
base::internal::LazySysInfoValue<size_t, MaxSharedMemorySize> >::Leaky
g_lazy_max_shared_memory = LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace base {
// static
int64 SysInfo::AmountOfAvailablePhysicalMemory() {
return AmountOfMemory(_SC_AVPHYS_PAGES);
}
// static
int64 SysInfo::AmountOfPhysicalMemory() {
return g_lazy_physical_memory.Get().value();
}
// static
size_t SysInfo::MaxSharedMemorySize() {
return g_lazy_max_shared_memory.Get().value();
}
// static
std::string SysInfo::CPUModelName() {
#if defined(OS_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);
}
}
}
return std::string();
}
} // namespace base
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