base/sys_info_posix.cc

   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 <errno.h>
   8 #include <string.h>
   9 #include <sys/param.h>
  10 #include <sys/resource.h>
  11 #include <sys/utsname.h>
  12 #include <unistd.h>
  13
  14 #include "base/basictypes.h"
  15 #include "base/files/file_util.h"
  16 #include "base/lazy_instance.h"
  17 #include "base/logging.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "base/sys_info_internal.h"
  20 #include "base/threading/thread_restrictions.h"
  21
  22 #if defined(OS_ANDROID)
  23 #include <sys/vfs.h>
  24 #define statvfs statfs  // Android uses a statvfs-like statfs struct and call.
  25 #else
  26 #include <sys/statvfs.h>
  27 #endif
  28
  29 namespace {
  30
  31 #if !defined(OS_OPENBSD)
  32 int NumberOfProcessors() {
  33   // sysconf returns the number of "logical" (not "physical") processors on both
  34   // Mac and Linux.  So we get the number of max available "logical" processors.
  35   //
  36   // Note that the number of "currently online" processors may be fewer than the
  37   // returned value of NumberOfProcessors(). On some platforms, the kernel may
  38   // make some processors offline intermittently, to save power when system
  39   // loading is low.
  40   //
  41   // One common use case that needs to know the processor count is to create
  42   // optimal number of threads for optimization. It should make plan according
  43   // to the number of "max available" processors instead of "currently online"
  44   // ones. The kernel should be smart enough to make all processors online when
  45   // it has sufficient number of threads waiting to run.
  46   long res = sysconf(_SC_NPROCESSORS_CONF);
  47   if (res == -1) {
  48     NOTREACHED();
  49     return 1;
  50   }
  51
  52   return static_cast<int>(res);
  53 }
  54
  55 base::LazyInstance<
  56     base::internal::LazySysInfoValue<int, NumberOfProcessors> >::Leaky
  57     g_lazy_number_of_processors = LAZY_INSTANCE_INITIALIZER;
  58 #endif
  59
  60 int64 AmountOfVirtualMemory() {
  61   struct rlimit limit;
  62   int result = getrlimit(RLIMIT_DATA, &limit);
  63   if (result != 0) {
  64     NOTREACHED();
  65     return 0;
  66   }
  67   return limit.rlim_cur == RLIM_INFINITY ? 0 : limit.rlim_cur;
  68 }
  69
  70 base::LazyInstance<
  71     base::internal::LazySysInfoValue<int64, AmountOfVirtualMemory> >::Leaky
  72     g_lazy_virtual_memory = LAZY_INSTANCE_INITIALIZER;
  73
  74 }  // namespace
  75
  76 namespace base {
  77
  78 #if !defined(OS_OPENBSD)
  79 int SysInfo::NumberOfProcessors() {
  80   return g_lazy_number_of_processors.Get().value();
  81 }
  82 #endif
  83
  84 // static
  85 int64 SysInfo::AmountOfVirtualMemory() {
  86   return g_lazy_virtual_memory.Get().value();
  87 }
  88
  89 // static
  90 int64 SysInfo::AmountOfFreeDiskSpace(const FilePath& path) {
  91   base::ThreadRestrictions::AssertIOAllowed();
  92
  93   struct statvfs stats;
  94   if (HANDLE_EINTR(statvfs(path.value().c_str(), &stats)) != 0)
  95     return -1;
  96   return static_cast<int64>(stats.f_bavail) * stats.f_frsize;
  97 }
  98
  99 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 100 // static
 101 std::string SysInfo::OperatingSystemName() {
 102   struct utsname info;
 103   if (uname(&info) < 0) {
 104     NOTREACHED();
 105     return std::string();
 106   }
 107   return std::string(info.sysname);
 108 }
 109 #endif
 110
 111 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 112 // static
 113 std::string SysInfo::OperatingSystemVersion() {
 114   struct utsname info;
 115   if (uname(&info) < 0) {
 116     NOTREACHED();
 117     return std::string();
 118   }
 119   return std::string(info.release);
 120 }
 121 #endif
 122
 123 // static
 124 std::string SysInfo::OperatingSystemArchitecture() {
 125   struct utsname info;
 126   if (uname(&info) < 0) {
 127     NOTREACHED();
 128     return std::string();
 129   }
 130   std::string arch(info.machine);
 131   if (arch == "i386" || arch == "i486" || arch == "i586" || arch == "i686") {
 132     arch = "x86";
 133   } else if (arch == "amd64") {
 134     arch = "x86_64";
 135   }
 136   return arch;
 137 }
 138
 139 // static
 140 size_t SysInfo::VMAllocationGranularity() {
 141   return getpagesize();
 142 }
 143
 144 }  // namespace base