Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A
R=andrew@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/linux.h

@@ -0,0 +1,123 @@
+/*
+ *  Copyright 2008 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_LINUX_H_
+#define WEBRTC_BASE_LINUX_H_
+
+#if defined(WEBRTC_LINUX)
+#include <string>
+#include <map>
+#include <vector>
+
+#include "webrtc/base/scoped_ptr.h"
+#include "webrtc/base/stream.h"
+
+namespace rtc {
+
+//////////////////////////////////////////////////////////////////////////////
+// ConfigParser parses a FileStream of an ".ini."-type format into a map.
+//////////////////////////////////////////////////////////////////////////////
+
+// Sample Usage:
+//   ConfigParser parser;
+//   ConfigParser::MapVector key_val_pairs;
+//   if (parser.Open(inifile) && parser.Parse(&key_val_pairs)) {
+//     for (int section_num=0; i < key_val_pairs.size(); ++section_num) {
+//       std::string val1 = key_val_pairs[section_num][key1];
+//       std::string val2 = key_val_pairs[section_num][key2];
+//       // Do something with valn;
+//     }
+//   }
+
+class ConfigParser {
+ public:
+  typedef std::map<std::string, std::string> SimpleMap;
+  typedef std::vector<SimpleMap> MapVector;
+
+  ConfigParser();
+  virtual ~ConfigParser();
+
+  virtual bool Open(const std::string& filename);
+  virtual void Attach(StreamInterface* stream);
+  virtual bool Parse(MapVector* key_val_pairs);
+  virtual bool ParseSection(SimpleMap* key_val_pair);
+  virtual bool ParseLine(std::string* key, std::string* value);
+
+ private:
+  scoped_ptr<StreamInterface> instream_;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+// ProcCpuInfo reads CPU info from the /proc subsystem on any *NIX platform.
+//////////////////////////////////////////////////////////////////////////////
+
+// Sample Usage:
+//   ProcCpuInfo proc_info;
+//   int no_of_cpu;
+//   if (proc_info.LoadFromSystem()) {
+//      std::string out_str;
+//      proc_info.GetNumCpus(&no_of_cpu);
+//      proc_info.GetCpuStringValue(0, "vendor_id", &out_str);
+//      }
+//   }
+
+class ProcCpuInfo {
+ public:
+  ProcCpuInfo();
+  virtual ~ProcCpuInfo();
+
+  // Reads the proc subsystem's cpu info into memory. If this fails, this
+  // returns false; if it succeeds, it returns true.
+  virtual bool LoadFromSystem();
+
+  // Obtains the number of logical CPU threads and places the value num.
+  virtual bool GetNumCpus(int* num);
+
+  // Obtains the number of physical CPU cores and places the value num.
+  virtual bool GetNumPhysicalCpus(int* num);
+
+  // Obtains the CPU family id.
+  virtual bool GetCpuFamily(int* id);
+
+  // Obtains the number of sections in /proc/cpuinfo, which may be greater
+  // than the number of CPUs (e.g. on ARM)
+  virtual bool GetSectionCount(size_t* count);
+
+  // Looks for the CPU proc item with the given name for the given section
+  // number and places the string value in result.
+  virtual bool GetSectionStringValue(size_t section_num, const std::string& key,
+                                     std::string* result);
+
+  // Looks for the CPU proc item with the given name for the given section
+  // number and places the int value in result.
+  virtual bool GetSectionIntValue(size_t section_num, const std::string& key,
+                                  int* result);
+
+ private:
+  ConfigParser::MapVector sections_;
+};
+
+#if !defined(WEBRTC_CHROMIUM_BUILDs)
+// Builds a string containing the info from lsb_release on a single line.
+std::string ReadLinuxLsbRelease();
+#endif
+
+// Returns the output of "uname".
+std::string ReadLinuxUname();
+
+// Returns the content (int) of
+// /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
+// Returns -1 on error.
+int ReadCpuMaxFreq();
+
+}  // namespace rtc
+
+#endif  // defined(WEBRTC_LINUX)
+#endif  // WEBRTC_BASE_LINUX_H_