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diff --git a/runtime/tcpclt.h b/runtime/tcpclt.h
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+/* tcpclt.h
+ *
+ * This are the definitions for the TCP based clients class.
+ *
+ * File begun on 2007-07-21 by RGerhards (extracted from syslogd.c)
+ *
+ * Copyright 2007-2012 Adiscon GmbH.
+ *
+ * This file is part of rsyslog.
+ *
+ * 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	TCPCLT_H_INCLUDED
+#define	TCPCLT_H_INCLUDED 1
+
+#include "obj.h"
+
+/* the tcpclt object */
+typedef struct tcpclt_s {
+	BEGINobjInstance;	/**< Data to implement generic object - MUST be the first data element! */
+	TCPFRAMINGMODE tcp_framing;
+	uchar tcp_framingDelimiter;
+	char *prevMsg;
+	short bResendLastOnRecon; /* should the last message be resent on a successful reconnect? */
+	size_t lenPrevMsg;
+	/* session specific callbacks */
+	int iRebindInterval;	/* how often should the send socket be rebound? */
+	int iNumMsgs;		/* number of messages during current "rebind session" */
+	rsRetVal (*initFunc)(void*);
+	rsRetVal (*sendFunc)(void*, char*, size_t);
+	rsRetVal (*prepRetryFunc)(void*);
+} tcpclt_t;
+
+
+/* interfaces */
+BEGINinterface(tcpclt) /* name must also be changed in ENDinterface macro! */
+	rsRetVal (*Construct)(tcpclt_t **ppThis);
+	rsRetVal (*ConstructFinalize)(tcpclt_t __attribute__((unused)) *pThis);
+	rsRetVal (*Destruct)(tcpclt_t **ppThis);
+	int (*Send)(tcpclt_t *pThis, void*pData, char*msg, size_t len);
+	int (*CreateSocket)(struct addrinfo *addrDest);
+	/* set methods */
+	rsRetVal (*SetResendLastOnRecon)(tcpclt_t*, int);
+	rsRetVal (*SetSendInit)(tcpclt_t*, rsRetVal (*)(void*));
+	rsRetVal (*SetSendFrame)(tcpclt_t*, rsRetVal (*)(void*, char*, size_t));
+	rsRetVal (*SetSendPrepRetry)(tcpclt_t*, rsRetVal (*)(void*));
+	rsRetVal (*SetFraming)(tcpclt_t*, TCPFRAMINGMODE framing);
+	/* v3, 2009-07-14*/
+	rsRetVal (*SetRebindInterval)(tcpclt_t*, int iRebindInterval);
+	/* v4, 2017-06-10*/
+	rsRetVal (*SetFramingDelimiter)(tcpclt_t*, uchar tcp_framingDelimiter);
+ENDinterface(tcpclt)
+#define tcpcltCURR_IF_VERSION 4 /* increment whenever you change the interface structure! */
+
+
+/* prototypes */
+PROTOTYPEObj(tcpclt);
+
+/* the name of our library binary */
+#define LM_TCPCLT_FILENAME "lmtcpclt"
+
+#endif /* #ifndef TCPCLT_H_INCLUDED */
+/* vim:set ai:
+ */