netwerk/wifi/nsWifiScannerWin.cpp
author Chris Manchester <cmanchester@mozilla.com>
Thu, 12 May 2016 11:55:59 -0700
changeset 336238 86c89e604e9b78cf269a8095f45f8054326ffff2
parent 277763 faacf69f83adec2f2c0bbaf49a548b6e65db1ae9
child 373813 c85f83a7fcd7b1bda04318a2cc6370eb5247600e
permissions -rw-r--r--
Bug 1257326 - Remove MOZ_SERVICES_COMMON. It is usually set, but never checked. r=glandium MozReview-Commit-ID: Km8hEYki2Rv

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsWifiMonitor.h"

// moz headers (alphabetical)
#include "nsAutoPtr.h"
#include "nsCOMArray.h"
#include "nsComponentManagerUtils.h"
#include "nsIMutableArray.h"
#include "nsServiceManagerUtils.h"
#include "nsWifiAccessPoint.h"
#include "win_wifiScanner.h"
#include "win_xp_wifiScanner.h"
#include "mozilla/WindowsVersion.h"

using namespace mozilla;

/**
 * `nsWifiMonitor` is declared in the cross-platform nsWifiMonitor.h and
 * is mostly defined in the cross-platform nsWifiMonitor.cpp. This function
 * is implemented in various platform-specific files but the implementation
 * is almost identical in each file. We relegate the Windows-specific
 * work to the `WinWifiScanner` class and deal with non-Windows-specific
 * issues like calling listeners here. Hopefully this file can be merged
 * with the other implementations of `nsWifiMonitor::DoScan` since a lot
 * of the code is identical
 */
nsresult
nsWifiMonitor::DoScan()
{
    if (!mWinWifiScanner) {
      if (IsWin2003OrLater()) {
        mWinWifiScanner = new WinWifiScanner();
        LOG(("Using Windows 2003+ wifi scanner."));
      } else {
        mWinWifiScanner = new WinXPWifiScanner();
        LOG(("Using Windows XP wifi scanner."));
      }

      if (!mWinWifiScanner) {
        // TODO: Probably return OOM error
        return NS_ERROR_FAILURE;
      }
    }

    // Regularly get the access point data.

    nsCOMArray<nsWifiAccessPoint> lastAccessPoints;
    nsCOMArray<nsWifiAccessPoint> accessPoints;

    do {
      accessPoints.Clear();
      nsresult rv = mWinWifiScanner->GetAccessPointsFromWLAN(accessPoints);
      if (NS_FAILED(rv)) {
        return rv;
      }

      bool accessPointsChanged = !AccessPointsEqual(accessPoints, lastAccessPoints);
      ReplaceArray(lastAccessPoints, accessPoints);

      rv = CallWifiListeners(lastAccessPoints, accessPointsChanged);
      NS_ENSURE_SUCCESS(rv, rv);

      // wait for some reasonable amount of time.  pref?
      LOG(("waiting on monitor\n"));

      ReentrantMonitorAutoEnter mon(mReentrantMonitor);
      if (mKeepGoing) {
          mon.Wait(PR_SecondsToInterval(kDefaultWifiScanInterval));
      }
    }
    while (mKeepGoing);

    return NS_OK;
}