timer.c revision 267654 
1/*
2 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000, 2001  Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id: timer.c,v 1.7 2007/06/19 23:47:16 tbox Exp $ */
19
20/*! \file */
21
22#include <config.h>
23
24#include <isc/result.h>
25#include <isc/time.h>
26#include <isc/timer.h>
27
28#include <dns/types.h>
29#include <dns/timer.h>
30
31#define CHECK(op) \
32	do { result = (op);					\
33		if (result != ISC_R_SUCCESS) goto failure;	\
34	} while (0)
35
36isc_result_t
37dns_timer_setidle(isc_timer_t *timer, unsigned int maxtime,
38		  unsigned int idletime, isc_boolean_t purge)
39{
40	isc_result_t result;
41	isc_interval_t maxinterval, idleinterval;
42	isc_time_t expires;
43
44	/* Compute the time of expiry. */
45	isc_interval_set(&maxinterval, maxtime, 0);
46	CHECK(isc_time_nowplusinterval(&expires, &maxinterval));
47
48	/*
49	 * Compute the idle interval, and add a spare nanosecond to
50	 * work around the silly limitation of the ISC timer interface
51	 * that you cannot specify an idle interval of zero.
52	 */
53	isc_interval_set(&idleinterval, idletime, 1);
54
55	CHECK(isc_timer_reset(timer, isc_timertype_once,
56			      &expires, &idleinterval,
57			      purge));
58 failure:
59	return (result);
60}
61