Add network address and socket types

Types and methods for dealing with IPv4 and IPv6 addresses (and UNIX
domain socket addresses under UNIX). This does not include code for
actual socket I/O.

Originally from "gnio". Much of the code was written by Christian
Kellner, Samuel Cormier-Iijima, and Ryan Lortie.

Part of #548466.

gio/gnetworkingprivate.h

@@ -0,0 +1,53 @@
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __G_NETWORKINGPRIVATE_H__
+#define __G_NETWORKINGPRIVATE_H__
+
+#ifdef G_OS_WIN32
+
+#define WINVER 0x0501 // FIXME?
+#include <winsock2.h>
+#undef interface
+#include <ws2tcpip.h>
+#include <windns.h>
+
+#else /* !G_OS_WIN32 */
+
+#define BIND_4_COMPAT
+
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+/* We're supposed to define _GNU_SOURCE to get EAI_NODATA, but that
+ * won't actually work since <features.h> has already been included at
+ * this point. So we define __USE_GNU instead.
+ */
+#define __USE_GNU
+#include <netdb.h>
+#undef __USE_GNU
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <resolv.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#endif
+
+#endif /* __G_NETWORKINGPRIVATE_H__ */