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8eb88aafee
4708. [cleanup] Legacy Windows builds (i.e. for XP and earlier)
are no longer supported. [RT #45186]
4707. [func] The lightweight resolver daemon and library (lwresd
and liblwres) have been removed. [RT #45186]
4706. [func] Code implementing name server query processing has
been moved from bin/named to a new library "libns".
Functions remaining in bin/named are now prefixed
with "named_" rather than "ns_". This will make it
easier to write unit tests for name server code, or
link name server functionality into new tools.
[RT #45186]
102 lines
1.8 KiB
C
102 lines
1.8 KiB
C
/*
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* Copyright (C) 2017 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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/*! \file */
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#include <config.h>
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#include <stddef.h>
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#include <isc/mem.h>
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#include <isc/msgcat.h>
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#include <isc/mutex.h>
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#include <isc/once.h>
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#include <isc/util.h>
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#include <dns/name.h>
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#include <ns/lib.h>
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/***
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*** Globals
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***/
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LIBNS_EXTERNAL_DATA unsigned int ns_pps = 0U;
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/***
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*** Private
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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 *ns_g_mctx = NULL;
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static isc_boolean_t initialize_done = ISC_FALSE;
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static isc_mutex_t reflock;
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static unsigned int references = 0;
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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 == ISC_FALSE);
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result = isc_mem_create(0, 0, &ns_g_mctx);
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if (result != ISC_R_SUCCESS)
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return;
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result = isc_mutex_init(&reflock);
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if (result != ISC_R_SUCCESS)
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goto cleanup_mctx;
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initialize_done = ISC_TRUE;
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return;
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cleanup_mctx:
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if (ns_g_mctx != NULL)
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isc_mem_detach(&ns_g_mctx);
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}
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isc_result_t
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ns_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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if (!initialize_done)
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return (ISC_R_FAILURE);
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LOCK(&reflock);
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references++;
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UNLOCK(&reflock);
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return (ISC_R_SUCCESS);
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}
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void
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ns_lib_shutdown(void) {
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isc_boolean_t cleanup_ok = ISC_FALSE;
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LOCK(&reflock);
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if (--references == 0)
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cleanup_ok = ISC_TRUE;
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UNLOCK(&reflock);
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if (!cleanup_ok)
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return;
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if (ns_g_mctx != NULL)
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isc_mem_detach(&ns_g_mctx);
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}
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