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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* 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: lib.c,v 1.9 2020/01/21 23:59:20 tedu Exp $ */
/*! \file */
#include <config.h>
#include <stddef.h>
#include <isc/hash.h>
#include <isc/once.h>
#include <isc/util.h>
#include <dns/lib.h>
#include <dns/result.h>
#include <dst/dst.h>
/***
*** Globals
***/
unsigned int dns_pps = 0U;
/***
*** Functions
***/
static isc_once_t init_once = ISC_ONCE_INIT;
static isc_boolean_t initialize_done = ISC_FALSE;
static unsigned int references = 0;
static void
initialize(void) {
isc_result_t result;
REQUIRE(initialize_done == ISC_FALSE);
dns_result_register();
result = isc_hash_create(DNS_NAME_MAXWIRE);
if (result != ISC_R_SUCCESS)
return;
result = dst_lib_init();
if (result != ISC_R_SUCCESS)
goto cleanup_hash;
initialize_done = ISC_TRUE;
return;
cleanup_hash:
isc_hash_destroy();
}
isc_result_t
dns_lib_init(void) {
isc_result_t result;
/*
* Since this routine is expected to be used by a normal application,
* it should be better to return an error, instead of an emergency
* abort, on any failure.
*/
result = isc_once_do(&init_once, initialize);
if (result != ISC_R_SUCCESS)
return (result);
if (!initialize_done)
return (ISC_R_FAILURE);
references++;
return (ISC_R_SUCCESS);
}
void
dns_lib_shutdown(void) {
isc_boolean_t cleanup_ok = ISC_FALSE;
if (--references == 0)
cleanup_ok = ISC_TRUE;
if (!cleanup_ok)
return;
dst_lib_destroy();
isc_hash_destroy();
}
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