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diff --git a/c/src/libnetworking/netinet/tcp_debug.h b/c/src/libnetworking/netinet/tcp_debug.h
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+/*
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)tcp_debug.h 8.1 (Berkeley) 6/10/93
+ * $Id$
+ */
+
+#ifndef _NETINET_TCP_DEBUG_H_
+#define _NETINET_TCP_DEBUG_H_
+
+struct tcp_debug {
+ n_time td_time;
+ short td_act;
+ short td_ostate;
+ caddr_t td_tcb;
+ struct tcpiphdr td_ti;
+ short td_req;
+ struct tcpcb td_cb;
+};
+
+#define TA_INPUT 0
+#define TA_OUTPUT 1
+#define TA_USER 2
+#define TA_RESPOND 3
+#define TA_DROP 4
+
+#ifdef TANAMES
+static char *tanames[] =
+ { "input", "output", "user", "respond", "drop" };
+#endif
+
+#define TCP_NDEBUG 100
+
+#ifndef KERNEL
+/* XXX common variables for broken applications. */
+struct tcp_debug tcp_debug[TCP_NDEBUG];
+int tcp_debx;
+#endif
+
+#endif /* !_NETINET_TCP_DEBUG_H_ */