// Copyright (c) 2006-2008 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.

#include <winsock2.h>

#include "net/base/winsock_init.h"

#include "base/singleton.h"

namespace {

class WinsockInitSingleton {
 public:
  WinsockInitSingleton() : did_init_(false) {
    WORD winsock_ver = MAKEWORD(2,2);
    WSAData wsa_data;
    did_init_ = (WSAStartup(winsock_ver, &wsa_data) == 0);

    // The first time WSAGetLastError is called, the delay load helper will
    // resolve the address with GetProcAddress and fixup the import.  If a third
    // party application hooks system functions without correctly restoring the
    // error code, it is possible that the error code will be overwritten during
    // delay load resolution.  The result of the first call may be incorrect, so
    // make sure the function is bound and future results will be correct.
    WSAGetLastError();
  }

  ~WinsockInitSingleton() {
    if (did_init_)
      WSACleanup();
  }

 private:
  bool did_init_;
};

}  // namespace

namespace net {

void EnsureWinsockInit() {
  Singleton<WinsockInitSingleton>::get();
}

}  // namespace net