First cut at implementing wifi bindigns for linux, using glib-dbus to Network...

chrome/browser/geolocation/wifi_data_provider_mac.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // For OSX 10.5 we use the system API function WirelessScanSplit. This function
 // is not documented or included in the SDK, so we use a reverse-engineered
 // header, osx_wifi_.h. This file is taken from the iStumbler project
 // (http://www.istumbler.net).
 
 #include "chrome/browser/geolocation/wifi_data_provider_mac.h"
@@ skipping 10 matching lines @@
 const int kNoChangePollingInterval = 300000;  // 5 mins
 const int kTwoNoChangePollingInterval = 600000;  // 10 mins
 
 // Provides the wifi API binding for use when running on OSX 10.5 machines using
 // the Apple80211 framework.
 class Apple80211Api : public WifiDataProviderCommon::WlanApiInterface {
  public:
   Apple80211Api();
   virtual ~Apple80211Api();
 
+  // Must be called before any other interface method. Will return false if the
+  // Apple80211 framework cannot be initialized (e.g. running on post-10.5 OSX),
+  // in which case no other method may be called.
   bool Init();
 
   // WlanApiInterface
   virtual bool GetAccessPointData(WifiData::AccessPointDataSet* data);
 
  private:
   // Handle, context and function pointers for Apple80211 library.
   void* apple_80211_library_;
   WirelessContext* wifi_context_;
   WirelessAttachFunction WirelessAttach_function_;
   WirelessScanSplitFunction WirelessScanSplit_function_;
   WirelessDetachFunction WirelessDetach_function_;
 
   WifiData wifi_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(Apple80211Api);
 };
 
 Apple80211Api::Apple80211Api()
     : apple_80211_library_(NULL), wifi_context_(NULL),
       WirelessAttach_function_(NULL), WirelessScanSplit_function_(NULL),
       WirelessDetach_function_(NULL) {
 }
 
 Apple80211Api::~Apple80211Api() {
   if (WirelessDetach_function_)
@@ skipping 113 matching lines @@
 
   DLOG(INFO) << "MacWifiDataProvider : failed to initialize any wlan api";
   return NULL;
 }
 
 PollingPolicyInterface* MacWifiDataProvider::NewPollingPolicy() {
   return new GenericPollingPolicy<kDefaultPollingInterval,
                                   kNoChangePollingInterval,
                                   kTwoNoChangePollingInterval>;
 }