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      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/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   int64 limit;
     40   if (!base::StringToInt64(contents, &limit)) {
     41     limit = 0;
     42   }
     43   if (limit < 0 ||
     44       static_cast<uint64>(limit) > std::numeric_limits<size_t>::max()) {
     45     limit = 0;
     46   }
     47   DCHECK(limit > 0);
     48   return static_cast<size_t>(limit);
     49 }
     50 
     51 base::LazyInstance<
     52     base::internal::LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
     53     g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
     54 base::LazyInstance<
     55     base::internal::LazySysInfoValue<size_t, MaxSharedMemorySize> >::Leaky
     56     g_lazy_max_shared_memory = LAZY_INSTANCE_INITIALIZER;
     57 
     58 }  // namespace
     59 
     60 namespace base {
     61 
     62 // static
     63 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
     64   return AmountOfMemory(_SC_AVPHYS_PAGES);
     65 }
     66 
     67 // static
     68 int64 SysInfo::AmountOfPhysicalMemory() {
     69   return g_lazy_physical_memory.Get().value();
     70 }
     71 
     72 // static
     73 size_t SysInfo::MaxSharedMemorySize() {
     74   return g_lazy_max_shared_memory.Get().value();
     75 }
     76 
     77 // static
     78 std::string SysInfo::CPUModelName() {
     79 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
     80   const char kCpuModelPrefix[] = "Hardware";
     81 #else
     82   const char kCpuModelPrefix[] = "model name";
     83 #endif
     84   std::string contents;
     85   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
     86   DCHECK(!contents.empty());
     87   if (!contents.empty()) {
     88     std::istringstream iss(contents);
     89     std::string line;
     90     while (std::getline(iss, line)) {
     91       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
     92         size_t pos = line.find(": ");
     93         return line.substr(pos + 2);
     94       }
     95     }
     96   }
     97   return std::string();
     98 }
     99 
    100 }  // namespace base
    101