diff --git a/model/sync-app-socket-c.h b/model/sync-app-socket-c.h
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+++ b/model/sync-app-socket-c.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2012 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         卞超轶 Chaoyi Bian <bcy@pku.edu.cn>
+ *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef SYNC_APP_SOCKET_C_H
+#define SYNC_APP_SOCKET_C_H
+
+#include "sync-app-socket.h"
+
+extern "C" {
+	typedef struct SyncAppSocketStruct;
+
+	SyncAppSocketStruct *create_sync_app_socket(const char *prefix, void (*callback)(const char *, const char *));
+	void delete_sync_app_socket(SyncAppSocketStruct **sock);
+	bool sync_app_socket_publish(SyncAppSocketStruct *sock, const char *prefix, uint32_t session, const char *buf, int freshness);
+	void sync_app_socket_remove(SyncAppSocketStruct *sock, const char *prefix);
+}
+
+#endif // SYNC_APP_SOCKET_C_H