mirror of
https://gitlab.isc.org/isc-projects/bind9
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6494665f08
The 'ephemeral' database implementation was used to provide a lightweight database implemenation that doesn't cache results, and the only place where it was really use is "samples" because delv is overriding this to use "rbtdb" instead. Otherwise it was completely unused. * The 'ephemeral' cache DB (ecdb) implementation. An ecdb just provides * temporary storage for ongoing name resolution with the common DB interfaces. * It actually doesn't cache anything. The implementation expects any stored * data is released within a short period, and does not care about the * scalability in terms of the number of nodes.
105 lines
1.9 KiB
C
105 lines
1.9 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <stdbool.h>
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#include <stddef.h>
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#include <isc/hash.h>
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#include <isc/mem.h>
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#include <isc/mutex.h>
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#include <isc/once.h>
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#include <isc/refcount.h>
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#include <isc/util.h>
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#include <dns/db.h>
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#include <dns/lib.h>
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#include <dns/result.h>
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#include <dst/dst.h>
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/***
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*** Globals
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***/
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LIBDNS_EXTERNAL_DATA unsigned int dns_pps = 0U;
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/***
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*** Functions
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***/
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static isc_once_t init_once = ISC_ONCE_INIT;
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static isc_mem_t *dns_g_mctx = NULL;
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static bool initialize_done = false;
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static isc_refcount_t references;
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static void
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initialize(void) {
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isc_result_t result;
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REQUIRE(initialize_done == false);
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isc_refcount_init(&references, 0);
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isc_mem_create(&dns_g_mctx);
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dns_result_register();
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result = dst_lib_init(dns_g_mctx, NULL);
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if (result != ISC_R_SUCCESS) {
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goto cleanup_mctx;
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}
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initialize_done = true;
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return;
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cleanup_mctx:
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if (dns_g_mctx != NULL) {
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isc_mem_detach(&dns_g_mctx);
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}
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}
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isc_result_t
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dns_lib_init(void) {
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isc_result_t result;
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/*
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* Since this routine is expected to be used by a normal application,
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* it should be better to return an error, instead of an emergency
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* abort, on any failure.
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*/
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result = isc_once_do(&init_once, initialize);
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if (result != ISC_R_SUCCESS) {
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return (result);
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}
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if (!initialize_done) {
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return (ISC_R_FAILURE);
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}
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isc_refcount_increment0(&references);
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return (ISC_R_SUCCESS);
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}
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void
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dns_lib_shutdown(void) {
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if (isc_refcount_decrement(&references) == 1) {
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dst_lib_destroy();
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isc_refcount_destroy(&references);
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if (dns_g_mctx != NULL) {
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isc_mem_detach(&dns_g_mctx);
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}
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}
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}
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