Initial commit of sync engine code to browser/sync....

chrome/browser/sync/notifier/base/nethelpers.cc

+// Copyright (c) 2009 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 "chrome/browser/sync/notifier/base/nethelpers.h"
+
+namespace notifier {
+
+hostent* SafeGetHostByName(const char* hostname, hostent* host,
+                           char* buffer, size_t buffer_len,
+                           int* herrno) {
+  hostent* result = NULL;
+#if WIN32
+  result = gethostbyname(hostname);
+  if (!result) {
+    *herrno = WSAGetLastError();
+  }
+#elif OS_LINUX
+  gethostbyname_r(hostname, host, buffer, buffer_len, &result, herrno);
+#elif OSX
+  result = getipnodebyname(hostname, AF_INET, AI_DEFAULT, herrno);
+#else
+#error "I don't know how to do gethostbyname safely on your system."
+#endif
+  return result;
+}
+
+// This function should mirror the above function, and free any resources
+// allocated by the above.
+void FreeHostEnt(hostent* host) {
+#if WIN32
+  // No need to free anything, struct returned is static memory.
+#elif OS_LINUX
+  // No need to free anything, we pass in a pointer to a struct.
+#elif OSX
+  freehostent(host);
+#else
+#error "I don't know how to free a hostent on your system."
+#endif
+}
+
+}  // namespace notifier