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// 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
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