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/strings/string_number_conversions.h"
  13 #include "base/sys_info_internal.h"
  14
  15 namespace {
  16
  17 int64 AmountOfMemory(int pages_name) {
  18   long pages = sysconf(pages_name);
  19   long page_size = sysconf(_SC_PAGESIZE);
  20   if (pages == -1 || page_size == -1) {
  21     NOTREACHED();
  22     return 0;
  23   }
  24   return static_cast<int64>(pages) * page_size;
  25 }
  26
  27 int64 AmountOfPhysicalMemory() {
  28   return AmountOfMemory(_SC_PHYS_PAGES);
  29 }
  30
  31 size_t MaxSharedMemorySize() {
  32   std::string contents;
  33   base::ReadFileToString(base::FilePath("/proc/sys/kernel/shmmax"), &contents);
  34   DCHECK(!contents.empty());
  35   if (!contents.empty() && contents[contents.length() - 1] == '\n') {
  36     contents.erase(contents.length() - 1);
  37   }
  38
  39   uint64 limit;
  40   if (!base::StringToUint64(contents, &limit)) {
  41     limit = 0;
  42   }
  43   if (limit > std::numeric_limits<size_t>::max()) {
  44     limit = 0;
  45   }
  46   DCHECK_GT(limit, 0u);
  47   return static_cast<size_t>(limit);
  48 }
  49
  50 base::LazyInstance<
  51     base::internal::LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
  52     g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
  53 base::LazyInstance<
  54     base::internal::LazySysInfoValue<size_t, MaxSharedMemorySize> >::Leaky
  55     g_lazy_max_shared_memory = LAZY_INSTANCE_INITIALIZER;
  56
  57 }  // namespace
  58
  59 namespace base {
  60
  61 // static
  62 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
  63   return AmountOfMemory(_SC_AVPHYS_PAGES);
  64 }
  65
  66 // static
  67 int64 SysInfo::AmountOfPhysicalMemory() {
  68   return g_lazy_physical_memory.Get().value();
  69 }
  70
  71 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
  72 bool SysInfo::HasSeekPenalty(const FilePath& path, bool* has_seek_penalty) {
  73   // TODO(dbeam): implement.
  74   return false;
  75 }
  76 #endif
  77
  78 // static
  79 size_t SysInfo::MaxSharedMemorySize() {
  80   return g_lazy_max_shared_memory.Get().value();
  81 }
  82
  83 // static
  84 std::string SysInfo::CPUModelName() {
  85 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
  86   const char kCpuModelPrefix[] = "Hardware";
  87 #else
  88   const char kCpuModelPrefix[] = "model name";
  89 #endif
  90   std::string contents;
  91   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
  92   DCHECK(!contents.empty());
  93   if (!contents.empty()) {
  94     std::istringstream iss(contents);
  95     std::string line;
  96     while (std::getline(iss, line)) {
  97       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
  98         size_t pos = line.find(": ");
  99         return line.substr(pos + 2);
 100       }
 101     }
 102   }
 103   return std::string();
 104 }
 105
 106 }  // namespace base