netwerk/wifi/nsWifiScannerWin.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "nsWifiMonitor.h"
   6
   7 // moz headers (alphabetical)
   8 #include "nsAutoPtr.h"
   9 #include "nsCOMArray.h"
  10 #include "nsComponentManagerUtils.h"
  11 #include "nsIMutableArray.h"
  12 #include "nsServiceManagerUtils.h"
  13 #include "nsWifiAccessPoint.h"
  14 #include "win_wifiScanner.h"
  15
  16 using namespace mozilla;
  17
  18 /**
  19  * `nsWifiMonitor` is declared in the cross-platform nsWifiMonitor.h and
  20  * is mostly defined in the cross-platform nsWifiMonitor.cpp. This function
  21  * is implemented in various platform-specific files but the implementation
  22  * is almost identical in each file. We relegate the Windows-specific
  23  * work to the `WinWifiScanner` class and deal with non-Windows-specific
  24  * issues like calling listeners here. Hopefully this file can be merged
  25  * with the other implementations of `nsWifiMonitor::DoScan` since a lot
  26  * of the code is identical
  27  */
  28 nsresult
  29 nsWifiMonitor::DoScan()
  30 {
  31     if (!mWinWifiScanner) {
  32       mWinWifiScanner = new WinWifiScanner();
  33       if (!mWinWifiScanner) {
  34         // TODO: Probably return OOM error
  35         return NS_ERROR_FAILURE;
  36       }
  37     }
  38
  39     // Regularly get the access point data.
  40
  41     nsCOMArray<nsWifiAccessPoint> lastAccessPoints;
  42     nsCOMArray<nsWifiAccessPoint> accessPoints;
  43
  44     do {
  45       accessPoints.Clear();
  46       nsresult rv = mWinWifiScanner->GetAccessPointsFromWLAN(accessPoints);
  47       if (NS_FAILED(rv)) {
  48         return rv;
  49       }
  50
  51       bool accessPointsChanged = !AccessPointsEqual(accessPoints, lastAccessPoints);
  52       ReplaceArray(lastAccessPoints, accessPoints);
  53
  54       rv = CallWifiListeners(lastAccessPoints, accessPointsChanged);
  55       NS_ENSURE_SUCCESS(rv, rv);
  56
  57       // wait for some reasonable amount of time.  pref?
  58       LOG(("waiting on monitor\n"));
  59
  60       ReentrantMonitorAutoEnter mon(mReentrantMonitor);
  61       mon.Wait(PR_SecondsToInterval(kDefaultWifiScanInterval));
  62     }
  63     while (mKeepGoing);
  64
  65     return NS_OK;
  66 }