| // Copyright (c) 2011 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/lazy_instance.h" |
| #include "base/logging.h" |
| |
| namespace { |
| |
| class WinsockInitSingleton { |
| public: |
| WinsockInitSingleton() { |
| WORD winsock_ver = MAKEWORD(2, 2); |
| WSAData wsa_data; |
| bool did_init = (WSAStartup(winsock_ver, &wsa_data) == 0); |
| if (did_init) { |
| DCHECK(wsa_data.wVersion == winsock_ver); |
| |
| // 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() { |
| // Don't call WSACleanup() since the worker pool threads can continue to |
| // call getaddrinfo() after Winsock has shutdown, which can lead to crashes. |
| } |
| }; |
| |
| static base::LazyInstance<WinsockInitSingleton> g_winsock_init_singleton = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| namespace net { |
| |
| void EnsureWinsockInit() { |
| g_winsock_init_singleton.Get(); |
| } |
| |
| } // namespace net |