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diff --git a/librabbitmq/windows/socket.c b/librabbitmq/windows/socket.c
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+/*
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * The Original Code is librabbitmq.
+ *
+ * The Initial Developers of the Original Code are LShift Ltd, Cohesive
+ * Financial Technologies LLC, and Rabbit Technologies Ltd. Portions
+ * created before 22-Nov-2008 00:00:00 GMT by LShift Ltd, Cohesive
+ * Financial Technologies LLC, or Rabbit Technologies Ltd are Copyright
+ * (C) 2007-2008 LShift Ltd, Cohesive Financial Technologies LLC, and
+ * Rabbit Technologies Ltd.
+ *
+ * Portions created by LShift Ltd are Copyright (C) 2007-2010 LShift
+ * Ltd. Portions created by Cohesive Financial Technologies LLC are
+ * Copyright (C) 2007-2010 Cohesive Financial Technologies
+ * LLC. Portions created by Rabbit Technologies Ltd are Copyright (C)
+ * 2007-2010 Rabbit Technologies Ltd.
+ *
+ * Portions created by Tony Garnock-Jones are Copyright (C) 2009-2010
+ * LShift Ltd and Tony Garnock-Jones.
+ *
+ * All Rights Reserved.
+ *
+ * Contributor(s): ______________________________________.
+ *
+ * Alternatively, the contents of this file may be used under the terms
+ * of the GNU General Public License Version 2 or later (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of those
+ * above. If you wish to allow use of your version of this file only
+ * under the terms of the GPL, and not to allow others to use your
+ * version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the
+ * notice and other provisions required by the GPL. If you do not
+ * delete the provisions above, a recipient may use your version of
+ * this file under the terms of any one of the MPL or the GPL.
+ *
+ * ***** END LICENSE BLOCK *****
+ */
+
+#include <windows.h>
+#include <stdint.h>
+
+#include "amqp.h"
+#include "amqp_private.h"
+#include "socket.h"
+
+static int called_wsastartup;
+
+int amqp_socket_init(void)
+{
+ if (!called_wsastartup) {
+ WSADATA data;
+ int res = WSAStartup(0x0202, &data);
+ if (res)
+ return -res;
+
+ called_wsastartup = 1;
+ }
+
+ return 0;
+}
+
+char *amqp_os_error_string(int err)
+{
+ char *msg, *copy;
+
+ if (!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
+ | FORMAT_MESSAGE_ALLOCATE_BUFFER,
+ NULL, err,
+ MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+ (LPSTR)&msg, 0, NULL))
+ return strdup("(error retrieving Windows error message)");
+
+ copy = strdup(msg);
+ LocalFree(msg);
+ return copy;
+}