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diff --git a/lib/dns/include/dns/timer.h b/lib/dns/include/dns/timer.h
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+/*
+ * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2000, 2001 Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: timer.h,v 1.9 2007/06/19 23:47:17 tbox Exp $ */
+
+#ifndef DNS_TIMER_H
+#define DNS_TIMER_H 1
+
+/*! \file dns/timer.h */
+
+/***
+ *** Imports
+ ***/
+
+#include <isc/buffer.h>
+#include <isc/lang.h>
+
+ISC_LANG_BEGINDECLS
+
+/***
+ *** Functions
+ ***/
+
+isc_result_t
+dns_timer_setidle(isc_timer_t *timer, unsigned int maxtime,
+ unsigned int idletime, isc_boolean_t purge);
+/*%<
+ * Convenience function for setting up simple, one-second-granularity
+ * idle timers as used by zone transfers.
+ * \brief
+ * Set the timer 'timer' to go off after 'idletime' seconds of inactivity,
+ * or after 'maxtime' at the very latest. Events are purged iff
+ * 'purge' is ISC_TRUE.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* DNS_TIMER_H */