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diff --git a/runtime/nsd_ptcp.h b/runtime/nsd_ptcp.h
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+/* An implementation of the nsd interface for plain tcp sockets.
+ *
+ * Copyright 2007-2020 Adiscon GmbH.
+ *
+ * This file is part of the rsyslog runtime library.
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *       -or-
+ *       see COPYING.ASL20 in the source distribution
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef INCLUDED_NSD_PTCP_H
+#define INCLUDED_NSD_PTCP_H
+
+#include <sys/socket.h>
+#include "tcpsrv.h"
+
+#include "nsd.h"
+typedef nsd_if_t nsd_ptcp_if_t; /* we just *implement* this interface */
+
+/* the nsd_ptcp object */
+struct nsd_ptcp_s {
+	BEGINobjInstance; /* Data to implement generic object - MUST be the first data element! */
+	prop_t *remoteIP; /**< IP address of remote peer (currently used in server mode, only) */
+	uchar *pRemHostName; /**< host name of remote peer (currently used in server mode, only) */
+	struct sockaddr_storage remAddr; /**< remote addr as sockaddr - used for legacy ACL code */
+	int sock;	/**< the socket we use for regular, single-socket, operations */
+	int iKeepAliveIntvl;	/**< socket layer KEEPALIVE interval */
+	int iKeepAliveProbes;	/**< socket layer KEEPALIVE probes */
+	int iKeepAliveTime;	/**< socket layer KEEPALIVE timeout */
+};
+
+/* interface is defined in nsd.h, we just implement it! */
+#define nsd_ptcpCURR_IF_VERSION nsdCURR_IF_VERSION
+
+/* prototypes */
+PROTOTYPEObj(nsd_ptcp);
+
+/* the name of our library binary */
+#define LM_NSD_PTCP_FILENAME "lmnsd_ptcp"
+
+#endif /* #ifndef INCLUDED_NSD_PTCP_H */