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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 <stddef.h>
      8 #include <stdint.h>
      9 
     10 #include <limits>
     11 
     12 #include "base/files/file_util.h"
     13 #include "base/lazy_instance.h"
     14 #include "base/logging.h"
     15 #include "base/numerics/safe_conversions.h"
     16 #include "base/strings/string_number_conversions.h"
     17 #include "base/sys_info_internal.h"
     18 #include "build/build_config.h"
     19 
     20 namespace {
     21 
     22 int64_t AmountOfMemory(int pages_name) {
     23   long pages = sysconf(pages_name);
     24   long page_size = sysconf(_SC_PAGESIZE);
     25   if (pages == -1 || page_size == -1) {
     26     NOTREACHED();
     27     return 0;
     28   }
     29   return static_cast<int64_t>(pages) * page_size;
     30 }
     31 
     32 int64_t AmountOfPhysicalMemory() {
     33   return AmountOfMemory(_SC_PHYS_PAGES);
     34 }
     35 
     36 base::LazyInstance<
     37     base::internal::LazySysInfoValue<int64_t, AmountOfPhysicalMemory>>::Leaky
     38     g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
     39 
     40 }  // namespace
     41 
     42 namespace base {
     43 
     44 // static
     45 int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
     46   return AmountOfMemory(_SC_AVPHYS_PAGES);
     47 }
     48 
     49 // static
     50 int64_t SysInfo::AmountOfPhysicalMemory() {
     51   return g_lazy_physical_memory.Get().value();
     52 }
     53 
     54 // static
     55 std::string SysInfo::CPUModelName() {
     56 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
     57   const char kCpuModelPrefix[] = "Hardware";
     58 #else
     59   const char kCpuModelPrefix[] = "model name";
     60 #endif
     61   std::string contents;
     62   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
     63   DCHECK(!contents.empty());
     64   if (!contents.empty()) {
     65     std::istringstream iss(contents);
     66     std::string line;
     67     while (std::getline(iss, line)) {
     68       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
     69         size_t pos = line.find(": ");
     70         return line.substr(pos + 2);
     71       }
     72     }
     73   }
     74   return std::string();
     75 }
     76 
     77 }  // namespace base
     78