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      1 // Copyright (c) 2008 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/statvfs.h>
     11 #include <sys/sysctl.h>
     12 #include <sys/utsname.h>
     13 #include <unistd.h>
     14 
     15 #if !defined(OS_MACOSX)
     16 #include <gdk/gdk.h>
     17 #endif
     18 
     19 #include "base/basictypes.h"
     20 #include "base/file_util.h"
     21 #include "base/logging.h"
     22 #include "base/utf_string_conversions.h"
     23 
     24 namespace base {
     25 
     26 #if !defined(OS_OPENBSD)
     27 int SysInfo::NumberOfProcessors() {
     28   // It seems that sysconf returns the number of "logical" processors on both
     29   // Mac and Linux.  So we get the number of "online logical" processors.
     30   long res = sysconf(_SC_NPROCESSORS_ONLN);
     31   if (res == -1) {
     32     NOTREACHED();
     33     return 1;
     34   }
     35 
     36   return static_cast<int>(res);
     37 }
     38 #endif
     39 
     40 // static
     41 int64 SysInfo::AmountOfFreeDiskSpace(const FilePath& path) {
     42   struct statvfs stats;
     43   if (statvfs(path.value().c_str(), &stats) != 0) {
     44     return -1;
     45   }
     46   return static_cast<int64>(stats.f_bavail) * stats.f_frsize;
     47 }
     48 
     49 // static
     50 bool SysInfo::HasEnvVar(const wchar_t* var) {
     51   std::string var_utf8 = WideToUTF8(std::wstring(var));
     52   return getenv(var_utf8.c_str()) != NULL;
     53 }
     54 
     55 // static
     56 std::wstring SysInfo::GetEnvVar(const wchar_t* var) {
     57   std::string var_utf8 = WideToUTF8(std::wstring(var));
     58   char* value = getenv(var_utf8.c_str());
     59   if (!value) {
     60     return std::wstring();
     61   } else {
     62     return UTF8ToWide(value);
     63   }
     64 }
     65 
     66 // static
     67 std::string SysInfo::OperatingSystemName() {
     68   utsname info;
     69   if (uname(&info) < 0) {
     70     NOTREACHED();
     71     return "";
     72   }
     73   return std::string(info.sysname);
     74 }
     75 
     76 // static
     77 std::string SysInfo::OperatingSystemVersion() {
     78   utsname info;
     79   if (uname(&info) < 0) {
     80     NOTREACHED();
     81     return "";
     82   }
     83   return std::string(info.release);
     84 }
     85 
     86 // static
     87 std::string SysInfo::CPUArchitecture() {
     88   utsname info;
     89   if (uname(&info) < 0) {
     90     NOTREACHED();
     91     return "";
     92   }
     93   return std::string(info.machine);
     94 }
     95 
     96 #if !defined(OS_MACOSX)
     97 // static
     98 void SysInfo::GetPrimaryDisplayDimensions(int* width, int* height) {
     99   // Note that Bad Things Happen if this isn't called from the UI thread,
    100   // but also that there's no way to check that from here.  :(
    101   GdkScreen* screen = gdk_screen_get_default();
    102   if (width)
    103     *width = gdk_screen_get_width(screen);
    104   if (height)
    105     *height = gdk_screen_get_height(screen);
    106 }
    107 
    108 // static
    109 int SysInfo::DisplayCount() {
    110   // Note that Bad Things Happen if this isn't called from the UI thread,
    111   // but also that there's no way to check that from here.  :(
    112 
    113   // This query is kinda bogus for Linux -- do we want number of X screens?
    114   // The number of monitors Xinerama has?  We'll just use whatever GDK uses.
    115   GdkScreen* screen = gdk_screen_get_default();
    116   return gdk_screen_get_n_monitors(screen);
    117 }
    118 #endif
    119 
    120 // static
    121 size_t SysInfo::VMAllocationGranularity() {
    122   return getpagesize();
    123 }
    124 
    125 }  // namespace base
    126