base/sys_info_linux.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/sys_info.h"
   6
   7 #include <limits>
   8
   9 #include "base/files/file_util.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/logging.h"
  12 #include "base/numerics/safe_conversions.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/sys_info_internal.h"
  15
  16 namespace {
  17
  18 int64 AmountOfMemory(int pages_name) {
  19   long pages = sysconf(pages_name);
  20   long page_size = sysconf(_SC_PAGESIZE);
  21   if (pages == -1 || page_size == -1) {
  22     NOTREACHED();
  23     return 0;
  24   }
  25   return static_cast<int64>(pages) * page_size;
  26 }
  27
  28 int64 AmountOfPhysicalMemory() {
  29   return AmountOfMemory(_SC_PHYS_PAGES);
  30 }
  31
  32 uint64 MaxSharedMemorySize() {
  33   std::string contents;
  34   base::ReadFileToString(base::FilePath("/proc/sys/kernel/shmmax"), &contents);
  35   DCHECK(!contents.empty());
  36   if (!contents.empty() && contents[contents.length() - 1] == '\n') {
  37     contents.erase(contents.length() - 1);
  38   }
  39
  40   uint64 limit;
  41   if (!base::StringToUint64(contents, &limit)) {
  42     limit = 0;
  43   }
  44   DCHECK_GT(limit, 0u);
  45   return limit;
  46 }
  47
  48 base::LazyInstance<
  49     base::internal::LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
  50     g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
  51 base::LazyInstance<
  52     base::internal::LazySysInfoValue<uint64, MaxSharedMemorySize> >::Leaky
  53     g_lazy_max_shared_memory = LAZY_INSTANCE_INITIALIZER;
  54
  55 }  // namespace
  56
  57 namespace base {
  58
  59 // static
  60 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
  61   return AmountOfMemory(_SC_AVPHYS_PAGES);
  62 }
  63
  64 // static
  65 int64 SysInfo::AmountOfPhysicalMemory() {
  66   return g_lazy_physical_memory.Get().value();
  67 }
  68
  69 // static
  70 uint64 SysInfo::MaxSharedMemorySize() {
  71   return g_lazy_max_shared_memory.Get().value();
  72 }
  73
  74 // static
  75 std::string SysInfo::CPUModelName() {
  76 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
  77   const char kCpuModelPrefix[] = "Hardware";
  78 #else
  79   const char kCpuModelPrefix[] = "model name";
  80 #endif
  81   std::string contents;
  82   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
  83   DCHECK(!contents.empty());
  84   if (!contents.empty()) {
  85     std::istringstream iss(contents);
  86     std::string line;
  87     while (std::getline(iss, line)) {
  88       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
  89         size_t pos = line.find(": ");
  90         return line.substr(pos + 2);
  91       }
  92     }
  93   }
  94   return std::string();
  95 }
  96
  97 }  // namespace base