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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 <sys/sysctl.h>
      8 
      9 #include "base/logging.h"
     10 
     11 namespace base {
     12 
     13 int64 SysInfo::AmountOfPhysicalMemory() {
     14   int pages, page_size;
     15   size_t size = sizeof(pages);
     16   sysctlbyname("vm.stats.vm.v_page_count", &pages, &size, NULL, 0);
     17   sysctlbyname("vm.stats.vm.v_page_size", &page_size, &size, NULL, 0);
     18   if (pages == -1 || page_size == -1) {
     19     NOTREACHED();
     20     return 0;
     21   }
     22   return static_cast<int64>(pages) * page_size;
     23 }
     24 
     25 // static
     26 size_t SysInfo::MaxSharedMemorySize() {
     27   size_t limit;
     28   size_t size = sizeof(limit);
     29   if (sysctlbyname("kern.ipc.shmmax", &limit, &size, NULL, 0) < 0) {
     30     NOTREACHED();
     31     return 0;
     32   }
     33   return limit;
     34 }
     35 
     36 }  // namespace base
     37