/contrib/bind9/lib/dns/lib.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 168 lines · 96 code · 36 blank · 36 comment · 18 complexity · 39e0a07d10d3836282473846086fc7c0 MD5 · raw file
- /*
- * Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC")
- * Copyright (C) 1999-2001 Internet Software Consortium.
- *
- * 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 1.19 2009/09/03 00:12:23 each Exp $ */
- /*! \file */
- #include <config.h>
- #include <stddef.h>
- #include <isc/hash.h>
- #include <isc/mem.h>
- #include <isc/msgcat.h>
- #include <isc/mutex.h>
- #include <isc/once.h>
- #include <isc/util.h>
- #include <dns/db.h>
- #include <dns/ecdb.h>
- #include <dns/lib.h>
- #include <dns/result.h>
- #include <dst/dst.h>
- /***
- *** Globals
- ***/
- LIBDNS_EXTERNAL_DATA unsigned int dns_pps = 0U;
- LIBDNS_EXTERNAL_DATA isc_msgcat_t * dns_msgcat = NULL;
- /***
- *** Private
- ***/
- static isc_once_t msgcat_once = ISC_ONCE_INIT;
- /***
- *** Functions
- ***/
- static void
- open_msgcat(void) {
- isc_msgcat_open("libdns.cat", &dns_msgcat);
- }
- void
- dns_lib_initmsgcat(void) {
- /*
- * Initialize the DNS library's message catalog, dns_msgcat, if it
- * has not already been initialized.
- */
- RUNTIME_CHECK(isc_once_do(&msgcat_once, open_msgcat) == ISC_R_SUCCESS);
- }
- static isc_once_t init_once = ISC_ONCE_INIT;
- static isc_mem_t *dns_g_mctx = NULL;
- #ifndef BIND9
- static dns_dbimplementation_t *dbimp = NULL;
- #endif
- static isc_boolean_t initialize_done = ISC_FALSE;
- static isc_mutex_t reflock;
- static unsigned int references = 0;
- static void
- initialize(void) {
- isc_result_t result;
- REQUIRE(initialize_done == ISC_FALSE);
- result = isc_mem_create(0, 0, &dns_g_mctx);
- if (result != ISC_R_SUCCESS)
- return;
- dns_result_register();
- #ifndef BIND9
- result = dns_ecdb_register(dns_g_mctx, &dbimp);
- if (result != ISC_R_SUCCESS)
- goto cleanup_mctx;
- #endif
- result = isc_hash_create(dns_g_mctx, NULL, DNS_NAME_MAXWIRE);
- if (result != ISC_R_SUCCESS)
- goto cleanup_db;
- result = dst_lib_init(dns_g_mctx, NULL, 0);
- if (result != ISC_R_SUCCESS)
- goto cleanup_hash;
- result = isc_mutex_init(&reflock);
- if (result != ISC_R_SUCCESS)
- goto cleanup_dst;
- initialize_done = ISC_TRUE;
- return;
- cleanup_dst:
- dst_lib_destroy();
- cleanup_hash:
- isc_hash_destroy();
- cleanup_db:
- #ifndef BIND9
- dns_ecdb_unregister(&dbimp);
- cleanup_mctx:
- #endif
- isc_mem_detach(&dns_g_mctx);
- }
- 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);
- LOCK(&reflock);
- references++;
- UNLOCK(&reflock);
- return (ISC_R_SUCCESS);
- }
- void
- dns_lib_shutdown(void) {
- isc_boolean_t cleanup_ok = ISC_FALSE;
- LOCK(&reflock);
- if (--references == 0)
- cleanup_ok = ISC_TRUE;
- UNLOCK(&reflock);
- if (!cleanup_ok)
- return;
- dst_lib_destroy();
- isc_hash_destroy();
- #ifndef BIND9
- dns_ecdb_unregister(&dbimp);
- #endif
- isc_mem_detach(&dns_g_mctx);
- }