base/sys_info_linux.cc

   1 // Copyright (c) 2009 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 "base/file_util.h"
   8 #include "base/logging.h"
   9
  10 namespace base {
  11
  12 int64 SysInfo::AmountOfPhysicalMemory() {
  13   long pages = sysconf(_SC_PHYS_PAGES);
  14   long page_size = sysconf(_SC_PAGE_SIZE);
  15   if (pages == -1 || page_size == -1) {
  16     NOTREACHED();
  17     return 0;
  18   }
  19
  20   return static_cast<int64>(pages) * page_size;
  21 }
  22
  23 // static
  24 size_t SysInfo::MaxSharedMemorySize() {
  25   static size_t limit;
  26   static bool limit_valid = false;
  27   if (!limit_valid) {
  28     std::string contents;
  29     file_util::ReadFileToString(FilePath("/proc/sys/kernel/shmmax"), &contents);
  30     limit = strtoul(contents.c_str(), NULL, 0);
  31     limit_valid = true;
  32   }
  33   return limit;
  34 }
  35
  36 }  // namespace base