Home | History | Annotate | Download | only in base 
      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(limit > 0);
     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 // static
     72 size_t SysInfo::MaxSharedMemorySize() {
     73   return g_lazy_max_shared_memory.Get().value();
     74 }
     75 
     76 // static
     77 std::string SysInfo::CPUModelName() {
     78 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
     79   const char kCpuModelPrefix[] = "Hardware";
     80 #else
     81   const char kCpuModelPrefix[] = "model name";
     82 #endif
     83   std::string contents;
     84   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
     85   DCHECK(!contents.empty());
     86   if (!contents.empty()) {
     87     std::istringstream iss(contents);
     88     std::string line;
     89     while (std::getline(iss, line)) {
     90       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
     91         size_t pos = line.find(": ");
     92         return line.substr(pos + 2);
     93       }
     94     }
     95   }
     96   return std::string();
     97 }
     98 
     99 }  // namespace base
    100