contrib/bind-9.2.4rc7/lib/dns/timer.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and 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 1.2.2.1 2004/03/09 06:11:09 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <isc/result.h>
  23 #include <isc/time.h>
  24 #include <isc/timer.h>
  25
  26 #include <dns/types.h>
  27 #include <dns/timer.h>
  28
  29 #define CHECK(op) \
  30         do { result = (op);                                     \
  31                 if (result != ISC_R_SUCCESS) goto failure;      \
  32         } while (0)
  33
  34 isc_result_t
  35 dns_timer_setidle(isc_timer_t *timer, unsigned int maxtime,
  36                   unsigned int idletime, isc_boolean_t purge)
  37 {
  38         isc_result_t result;
  39         isc_interval_t maxinterval, idleinterval;
  40         isc_time_t expires;
  41
  42         /* Compute the time of expiry. */
  43         isc_interval_set(&maxinterval, maxtime, 0);
  44         CHECK(isc_time_nowplusinterval(&expires, &maxinterval));
  45
  46         /*
  47          * Compute the idle interval, and add a spare nanosecond to
  48          * work around the silly limitation of the ISC timer interface
  49          * that you cannot specify an idle interval of zero.
  50          */
  51         isc_interval_set(&idleinterval, idletime, 1);
  52
  53         CHECK(isc_timer_reset(timer, isc_timertype_once,
  54                               &expires, &idleinterval,
  55                               purge));
  56  failure:
  57         return (result);
  58 }